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href="#Caratteristiche"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Caratteristiche</span> </div> </a> <ul id="toc-Caratteristiche-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Trattazione_matematica" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Trattazione_matematica"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Trattazione matematica</span> </div> </a> <ul id="toc-Trattazione_matematica-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Note" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Note"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Note</span> </div> </a> <ul id="toc-Note-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Altri_progetti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Altri_progetti"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Altri progetti</span> </div> </a> <ul id="toc-Altri_progetti-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Collegamenti_esterni" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Collegamenti_esterni"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Collegamenti esterni</span> </div> </a> <ul id="toc-Collegamenti_esterni-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indice" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostra/Nascondi l'indice" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Mostra/Nascondi l'indice</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Cavo coassiale</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vai a una voce in un'altra lingua. Disponibile in 56 lingue" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-56" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">56 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%83%D8%A8%D9%84_%D9%85%D8%AD%D9%88%D8%B1%D9%8A" title="كبل محوري - arabo" lang="ar" hreflang="ar" data-title="كبل محوري" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Koaksial_kabel" title="Koaksial kabel - azerbaigiano" lang="az" hreflang="az" data-title="Koaksial kabel" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaigiano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B0%D0%BA%D1%81%D0%B8%D0%B0%D0%BB%D0%B5%D0%BD_%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB" title="Коаксиален кабел - bulgaro" lang="bg" hreflang="bg" data-title="Коаксиален кабел" data-language-autonym="Български" data-language-local-name="bulgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Cable_coaxial" title="Cable coaxial - catalano" lang="ca" hreflang="ca" data-title="Cable coaxial" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Koaxi%C3%A1ln%C3%AD_kabel" title="Koaxiální kabel - ceco" lang="cs" hreflang="cs" data-title="Koaxiální kabel" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Koaksialkabel" title="Koaksialkabel - danese" lang="da" hreflang="da" data-title="Koaksialkabel" data-language-autonym="Dansk" data-language-local-name="danese" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Koaxialkabel" title="Koaxialkabel - tedesco" lang="de" hreflang="de" data-title="Koaxialkabel" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9F%CE%BC%CE%BF%CE%B1%CE%BE%CE%BF%CE%BD%CE%B9%CE%BA%CF%8C_%CE%BA%CE%B1%CE%BB%CF%8E%CE%B4%CE%B9%CE%BF" title="Ομοαξονικό καλώδιο - greco" lang="el" hreflang="el" data-title="Ομοαξονικό καλώδιο" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Coaxial_cable" title="Coaxial cable - inglese" lang="en" hreflang="en" data-title="Coaxial cable" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Samaksa_kablo" title="Samaksa kablo - esperanto" lang="eo" hreflang="eo" data-title="Samaksa kablo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Cable_coaxial" title="Cable coaxial - spagnolo" lang="es" hreflang="es" data-title="Cable coaxial" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Koaksiaalkaabel" title="Koaksiaalkaabel - estone" lang="et" hreflang="et" data-title="Koaksiaalkaabel" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Kable_ardazkide" title="Kable ardazkide - basco" lang="eu" hreflang="eu" data-title="Kable ardazkide" data-language-autonym="Euskara" data-language-local-name="basco" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D8%A7%D8%A8%D9%84_%DA%A9%D9%88%D8%A7%DA%A9%D8%B3%DB%8C%D8%A7%D9%84" title="کابل کواکسیال - persiano" lang="fa" hreflang="fa" data-title="کابل کواکسیال" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Koaksiaalikaapeli" title="Koaksiaalikaapeli - finlandese" lang="fi" hreflang="fi" data-title="Koaksiaalikaapeli" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/C%C3%A2ble_coaxial" title="Câble coaxial - francese" lang="fr" hreflang="fr" data-title="Câble coaxial" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/C%C3%A1bla_comhaiseach" title="Cábla comhaiseach - irlandese" lang="ga" hreflang="ga" data-title="Cábla comhaiseach" data-language-autonym="Gaeilge" data-language-local-name="irlandese" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Cable_coaxial" title="Cable coaxial - galiziano" lang="gl" hreflang="gl" data-title="Cable coaxial" data-language-autonym="Galego" data-language-local-name="galiziano" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%95%E0%AB%8B-%E0%AA%8D%E0%AA%95%E0%AB%8D%E0%AA%B8%E0%AA%BF%E0%AA%AF%E0%AA%B2_%E0%AA%95%E0%AB%87%E0%AA%AC%E0%AA%B2" title="કો-ઍક્સિયલ કેબલ - gujarati" lang="gu" hreflang="gu" data-title="કો-ઍક્સિયલ કેબલ" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9B%D7%91%D7%9C_%D7%A7%D7%95%D7%90%D7%A7%D7%A1%D7%99%D7%90%D7%9C%D7%99" title="כבל קואקסיאלי - ebraico" lang="he" hreflang="he" data-title="כבל קואקסיאלי" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A4%AE%E0%A4%BE%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A5%80%E0%A4%AF_%E0%A4%95%E0%A5%87%E0%A4%AC%E0%A4%B2" title="समाक्षीय केबल - hindi" lang="hi" hreflang="hi" data-title="समाक्षीय केबल" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Koaksijalni_kabel" title="Koaksijalni kabel - croato" lang="hr" hreflang="hr" data-title="Koaksijalni kabel" data-language-autonym="Hrvatski" data-language-local-name="croato" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Koaxi%C3%A1lis_k%C3%A1bel" title="Koaxiális kábel - ungherese" lang="hu" hreflang="hu" data-title="Koaxiális kábel" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%A1%D5%B4%D5%A1%D5%BC%D5%A1%D5%B6%D6%81%D6%84_%D5%B4%D5%A1%D5%AC%D5%B8%D6%82%D5%AD" title="Համառանցք մալուխ - armeno" lang="hy" hreflang="hy" data-title="Համառանցք մալուխ" data-language-autonym="Հայերեն" data-language-local-name="armeno" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Kabel_sepaksi" title="Kabel sepaksi - indonesiano" lang="id" hreflang="id" data-title="Kabel sepaksi" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%90%8C%E8%BB%B8%E3%82%B1%E3%83%BC%E3%83%96%E3%83%AB" title="同軸ケーブル - giapponese" lang="ja" hreflang="ja" data-title="同軸ケーブル" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%99%E1%83%9D%E1%83%90%E1%83%A5%E1%83%A1%E1%83%98%E1%83%90%E1%83%9A%E1%83%A3%E1%83%A0%E1%83%98_%E1%83%99%E1%83%90%E1%83%91%E1%83%94%E1%83%9A%E1%83%98" title="კოაქსიალური კაბელი - georgiano" lang="ka" hreflang="ka" data-title="კოაქსიალური კაბელი" data-language-autonym="ქართული" data-language-local-name="georgiano" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B0%D0%BA%D1%81%D0%B8%D0%B0%D0%BB_%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C" title="Коаксиал кабель - kazako" lang="kk" hreflang="kk" data-title="Коаксиал кабель" data-language-autonym="Қазақша" data-language-local-name="kazako" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%8F%E0%B2%95%E0%B2%BE%E0%B2%95%E0%B3%8D%E0%B2%B7_%E0%B2%95%E0%B3%87%E0%B2%AC%E0%B2%B2%E0%B3%8D" title="ಏಕಾಕ್ಷ ಕೇಬಲ್ - kannada" lang="kn" hreflang="kn" data-title="ಏಕಾಕ್ಷ ಕೇಬಲ್" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%8F%99%EC%B6%95_%EC%BC%80%EC%9D%B4%EB%B8%94" title="동축 케이블 - coreano" lang="ko" hreflang="ko" data-title="동축 케이블" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Bendraa%C5%A1is_kabelis" title="Bendraašis kabelis - lituano" lang="lt" hreflang="lt" data-title="Bendraašis kabelis" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Koaksi%C4%81lais_kabelis" title="Koaksiālais kabelis - lettone" lang="lv" hreflang="lv" data-title="Koaksiālais kabelis" data-language-autonym="Latviešu" data-language-local-name="lettone" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B0%D0%BA%D1%81%D0%B8%D1%98%D0%B0%D0%BB%D0%B5%D0%BD_%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB" title="Коаксијален кабел - macedone" lang="mk" hreflang="mk" data-title="Коаксијален кабел" data-language-autonym="Македонски" data-language-local-name="macedone" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kabel_sepaksi" title="Kabel sepaksi - malese" lang="ms" hreflang="ms" data-title="Kabel sepaksi" data-language-autonym="Bahasa Melayu" data-language-local-name="malese" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Coaxkabel" title="Coaxkabel - olandese" lang="nl" hreflang="nl" data-title="Coaxkabel" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Koaksialkabel" title="Koaksialkabel - norvegese bokmål" lang="nb" hreflang="nb" data-title="Koaksialkabel" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%95%E0%A9%8B%E0%A8%90%E0%A8%95%E0%A8%B8%E0%A9%80%E0%A8%85%E0%A8%B2_%E0%A8%95%E0%A9%87%E0%A8%AC%E0%A8%B2" title="ਕੋਐਕਸੀਅਲ ਕੇਬਲ - punjabi" lang="pa" hreflang="pa" data-title="ਕੋਐਕਸੀਅਲ ਕੇਬਲ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Kabel_koncentryczny" title="Kabel koncentryczny - polacco" lang="pl" hreflang="pl" data-title="Kabel koncentryczny" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%DA%A9%D9%88%DA%A9%D8%B4%DB%8C%D9%84_%DA%A9%DB%8C%D8%A8%D9%84" title="کوکشیل کیبل - pashto" lang="ps" hreflang="ps" data-title="کوکشیل کیبل" data-language-autonym="پښتو" data-language-local-name="pashto" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Cabo_coaxial" title="Cabo coaxial - portoghese" lang="pt" hreflang="pt" data-title="Cabo coaxial" data-language-autonym="Português" data-language-local-name="portoghese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Cablu_coaxial" title="Cablu coaxial - rumeno" lang="ro" hreflang="ro" data-title="Cablu coaxial" data-language-autonym="Română" data-language-local-name="rumeno" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B0%D0%BA%D1%81%D0%B8%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B9_%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C" title="Коаксиальный кабель - russo" lang="ru" hreflang="ru" data-title="Коаксиальный кабель" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Koaksijalni_kabl" title="Koaksijalni kabl - serbo-croato" lang="sh" hreflang="sh" data-title="Koaksijalni kabl" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croato" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Coaxial_cable" title="Coaxial cable - Simple English" lang="en-simple" hreflang="en-simple" data-title="Coaxial cable" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Koaxi%C3%A1lny_k%C3%A1bel" title="Koaxiálny kábel - slovacco" lang="sk" hreflang="sk" data-title="Koaxiálny kábel" data-language-autonym="Slovenčina" data-language-local-name="slovacco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Koaksialni_kabel" title="Koaksialni kabel - sloveno" lang="sl" hreflang="sl" data-title="Koaksialni kabel" data-language-autonym="Slovenščina" data-language-local-name="sloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Kabllo_koaksiale" title="Kabllo koaksiale - albanese" lang="sq" hreflang="sq" data-title="Kabllo koaksiale" data-language-autonym="Shqip" data-language-local-name="albanese" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B0%D0%BA%D1%81%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B8_%D0%BA%D0%B0%D0%B1%D0%BB" title="Коаксијални кабл - serbo" lang="sr" hreflang="sr" data-title="Коаксијални кабл" data-language-autonym="Српски / srpski" data-language-local-name="serbo" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Koaxialkabel" title="Koaxialkabel - svedese" lang="sv" hreflang="sv" data-title="Koaxialkabel" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%93%E0%AE%B0%E0%AE%9A%E0%AF%8D%E0%AE%9A%E0%AF%81_%E0%AE%B5%E0%AE%9F%E0%AE%AE%E0%AF%8D" title="ஓரச்சு வடம் - tamil" lang="ta" hreflang="ta" data-title="ஓரச்சு வடம்" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%9A%D0%B0%D0%B1%D0%B5%D0%BB%D0%B8_%D0%BA%D0%BE%D0%B0%D0%BA%D1%81%D0%B8%D0%B0%D0%BB%D3%A3" title="Кабели коаксиалӣ - tagico" lang="tg" hreflang="tg" data-title="Кабели коаксиалӣ" data-language-autonym="Тоҷикӣ" data-language-local-name="tagico" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Koaksiyel_kablo" title="Koaksiyel kablo - turco" lang="tr" hreflang="tr" data-title="Koaksiyel kablo" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B0%D0%BA%D1%81%D1%96%D0%B0%D0%BB%D1%8C%D0%BD%D0%B8%D0%B9_%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C" title="Коаксіальний кабель - ucraino" lang="uk" hreflang="uk" data-title="Коаксіальний кабель" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/C%C3%A1p_%C4%91%E1%BB%93ng_tr%E1%BB%A5c" title="Cáp đồng trục - vietnamita" lang="vi" hreflang="vi" data-title="Cáp đồng trục" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%90%8C%E8%BD%B4%E7%94%B5%E7%BC%86" title="同轴电缆 - wu" lang="wuu" hreflang="wuu" data-title="同轴电缆" data-language-autonym="吴语" data-language-local-name="wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%90%8C%E8%BD%B4%E7%94%B5%E7%BC%86" title="同轴电缆 - cinese" lang="zh" hreflang="zh" data-title="同轴电缆" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q183389#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespace"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul 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class="vector-dropdown-label-text">Strumenti</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Strumenti</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">nascondi</button> </div> <div 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href="/w/index.php?title=Cavo_coassiale&action=history"><span>Cronologia</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Generale </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Speciale:PuntanoQui/Cavo_coassiale" title="Elenco di tutte le pagine che sono collegate a questa [j]" accesskey="j"><span>Puntano qui</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Speciale:ModificheCorrelate/Cavo_coassiale" rel="nofollow" title="Elenco delle ultime modifiche alle pagine collegate a questa [k]" accesskey="k"><span>Modifiche correlate</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Speciale:PagineSpeciali" title="Elenco di tutte le pagine speciali [q]" accesskey="q"><span>Pagine speciali</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Cavo_coassiale&oldid=141194909" title="Collegamento permanente a questa versione di questa pagina"><span>Link permanente</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Cavo_coassiale&action=info" title="Ulteriori informazioni su questa pagina"><span>Informazioni pagina</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Speciale:Cita&page=Cavo_coassiale&id=141194909&wpFormIdentifier=titleform" title="Informazioni su come citare questa pagina"><span>Cita questa voce</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Speciale:UrlShortener&url=https%3A%2F%2Fit.wikipedia.org%2Fwiki%2FCavo_coassiale"><span>Ottieni URL breve</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Speciale:QrCode&url=https%3A%2F%2Fit.wikipedia.org%2Fwiki%2FCavo_coassiale"><span>Scarica codice QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Stampa/esporta </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Speciale:Libro&bookcmd=book_creator&referer=Cavo+coassiale"><span>Crea un libro</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Speciale:DownloadAsPdf&page=Cavo_coassiale&action=show-download-screen"><span>Scarica come PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Cavo_coassiale&printable=yes" title="Versione stampabile di questa pagina [p]" accesskey="p"><span>Versione stampabile</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In altri progetti </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Coaxial_cables" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q183389" title="Collegamento all'elemento connesso dell'archivio dati [g]" accesskey="g"><span>Elemento Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Strumenti pagine"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aspetto"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aspetto</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">nascondi</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Da Wikipedia, l'enciclopedia libera.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r133964453">.mw-parser-output .avviso .mbox-text-div>div,.mw-parser-output .avviso .mbox-text-full-div>div{font-size:90%}.mw-parser-output .avviso .mbox-image{flex-basis:52px;flex-grow:0;flex-shrink:0}.mw-parser-output .avviso .mbox-text-full-div .hide-when-compact{display:block}</style><div style="" class="ambox metadata plainlinks avviso avviso-contenuto"> <div class="avviso-immagine mbox-image noprint"><span typeof="mw:File"><a href="/wiki/File:Question_book-4.svg" class="mw-file-description" title="Niente fonti!"><img alt="Niente fonti!" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/45px-Question_book-4.svg.png" decoding="async" width="45" height="35" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/68px-Question_book-4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/90px-Question_book-4.svg.png 2x" data-file-width="262" data-file-height="204" /></a></span></div> <div class="avviso-testo mbox-text"> <div class="mbox-text-div"><b>Questa voce o sezione  sugli argomenti hardware e telecomunicazioni <a href="/wiki/Wikipedia:Uso_delle_fonti" title="Wikipedia:Uso delle fonti">non cita le fonti necessarie</a> o quelle presenti sono insufficienti</b>. <div class="hide-when-compact"><b>Commento</b>: <i>Questa voce manca completamente di fonti</i> <div class="noprint"><hr />Puoi <a class="external text" href="https://it.wikipedia.org/w/index.php?title=Cavo_coassiale&action=edit">migliorare questa voce</a> aggiungendo citazioni da <a href="/wiki/Wikipedia:Fonti_attendibili" title="Wikipedia:Fonti attendibili">fonti attendibili</a> secondo le <a href="/wiki/Wikipedia:Uso_delle_fonti" title="Wikipedia:Uso delle fonti">linee guida sull'uso delle fonti</a>. Segui i suggerimenti del <a href="/wiki/Progetto:Hardware" class="mw-redirect" title="Progetto:Hardware">progetto di riferimento</a>.</div> </div> </div> </div> </div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Bellingleeconnector.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Bellingleeconnector.jpg/220px-Bellingleeconnector.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/7/73/Bellingleeconnector.jpg 1.5x" data-file-width="284" data-file-height="213" /></a><figcaption><a href="/wiki/Connettore_elettrico" title="Connettore elettrico">Connettori</a> di un cavo coassiale per utilizzo <a href="/wiki/Televisione" title="Televisione">televisivo</a></figcaption></figure> <p>Il <b>cavo coassiale</b> (in <a href="/wiki/Lingua_inglese" title="Lingua inglese">inglese</a> <span dir="ltr" lang="en"><i>in inglese</i></span>, usualmente abbreviato in <i>coax</i>, <a href="/wiki/Aiuto:IPA_per_l%27inglese" title="Aiuto:IPA per l'inglese"><span title="Questa è una trascrizione IPA della pronuncia. Vedere l'alfabeto fonetico internazionale." class="IPA">/ˈkoʊ.æks/</span></a>), nelle <a href="/wiki/Telecomunicazioni" class="mw-redirect" title="Telecomunicazioni">telecomunicazioni</a>, è un <a href="/wiki/Cavo_elettrico" title="Cavo elettrico">cavo elettrico</a> usato come <a href="/wiki/Mezzo_trasmissivo" title="Mezzo trasmissivo">mezzo trasmissivo</a> di <a href="/wiki/Segnale_elettrico" title="Segnale elettrico">segnale elettrico</a> <a href="/wiki/Informazione" title="Informazione">informativo</a>, appartenente alle <a href="/wiki/Linea_di_trasmissione" title="Linea di trasmissione">linee di trasmissione</a> e molto usato nelle <a href="/wiki/Comunicazioni_elettriche" title="Comunicazioni elettriche">comunicazioni elettriche</a>. </p><p>Quando viene usato per il trasporto di segnale audiovisivo, come nel caso del segnale TV terrestre, prende il nome di <b>cavo RF</b>, dove "RF" sta per "radiofrequenza", in quanto il segnale è decodificato tramite frequenze radio<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>. </p><p>Viene comunemente detto anche <i>cavo video</i> poiché utilizzato spesso in applicazioni trasmissive di <a href="/wiki/Segnale_video" class="mw-redirect" title="Segnale video">segnale video</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Descrizione">Descrizione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=1" title="Modifica la sezione Descrizione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=1" title="Edit section's source code: Descrizione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>È composto da un singolo <a href="/wiki/Conduttore_elettrico" title="Conduttore elettrico">conduttore</a> di <a href="/wiki/Rame" title="Rame">rame</a> posto al centro del cavo (<i>anima</i>) e da un <a href="/wiki/Dielettrico" title="Dielettrico">dielettrico</a> (generalmente in <a href="/wiki/Polietilene" title="Polietilene">polietilene</a> o <a href="/wiki/Politetrafluoroetilene" title="Politetrafluoroetilene">PTFE</a>) che separa l'anima centrale da uno schermo esterno costituito da fili metallici intrecciati (<i>maglia</i>) o da una lamina avvolta a spirale (<i>treccia</i>), garantendo costantemente l'isolamento tra i due conduttori. Lo schermo di <a href="/wiki/Metallo" title="Metallo">metallo</a> aiuta a bloccare le <a href="/wiki/Interferenza_(telecomunicazioni)" title="Interferenza (telecomunicazioni)">interferenze</a>. Il cavo è munito poi di <a href="/wiki/Connettore_elettrico" title="Connettore elettrico">connettori</a> ai suoi estremi di connessione. </p><p>Il segnale viaggia sotto forma di <a href="/wiki/Campo_elettromagnetico" title="Campo elettromagnetico">campo elettromagnetico</a> tra l'anima e la maglia a una velocità v che è una frazione di quella della luce nel vuoto e pari a c/n con <i>n</i> <a href="/wiki/Indice_di_rifrazione" title="Indice di rifrazione">indice di rifrazione</a> del dielettrico frapposto. L'analisi della propagazione del campo elettromagnetico nel cavo coassiale fa parte della <i>teoria delle linee di trasmissione</i>, mentre l'effetto di convogliamento è paragonabile a quello di una <a href="/wiki/Guida_d%27onda" title="Guida d'onda">guida d'onda</a> metallica. In particolare in esso si propaga il modo elettromagnetico TEM. </p> <div class="mw-heading mw-heading3"><h3 id="Caratteristiche">Caratteristiche</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=2" title="Modifica la sezione Caratteristiche" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=2" title="Edit section's source code: Caratteristiche"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I cavi coassiali vengono prodotti di diversi tipi in funzione della <a href="/wiki/Frequenza" title="Frequenza">frequenza</a> del segnale da trasportare e della <a href="/wiki/Potenza_elettrica" title="Potenza elettrica">potenza</a> dello stesso. I valori di <a href="/wiki/Impedenza" title="Impedenza">impedenza</a> sono principalmente due: </p> <ul><li>50 <a href="/wiki/Ohm" title="Ohm">ohm</a>, utilizzato per le <a href="/wiki/Trasmissione_digitale" title="Trasmissione digitale">trasmissioni digitali</a> (come le prime versioni di <a href="/wiki/Ethernet" title="Ethernet">Ethernet</a>) o <a href="/wiki/Radioamatore" title="Radioamatore">radioamatoriali</a>, nonché per segnali standard nel campo degli strumenti di misura elettronici;</li> <li>75 <a href="/wiki/Ohm" title="Ohm">ohm</a>, utilizzato per il segnale <a href="/wiki/Video_analogico" title="Video analogico">video analogico</a>, video digitale SDI, per le antenne televisive (collegamento con l'<a href="/wiki/Antenna" title="Antenna">antenna</a> di ricezione terrestre o satellitare) e per le connessioni <a href="/wiki/Internet" title="Internet">Internet</a> via cavo.</li></ul> <p>L'impedenza caratteristica di 50 ohm è preferita per gli apparati trasmittenti o ricetrasmittenti, in quanto il conduttore centrale, a parità di diametro esterno del cavo, ha un diametro maggiore, quindi una resistenza più bassa e trasporta meglio correnti elevate; l'impedenza caratteristica di 75 ohm, viceversa, è preferita per gli apparati solo riceventi in quanto, a parità di diametro esterno, ha un'attenuazione minore di un cavo a 50 ohm. </p><p>Esistono anche cavi con impedenza caratteristica di 93 ohm e 105 ohm utilizzati per reti di connessione dati. Una tipologia particolare, caratterizzata da estrema flessibilità e buona resistenza allo strappo, è utilizzata nelle sonde per <a href="/wiki/Oscilloscopio" title="Oscilloscopio">oscilloscopio</a>. </p><p>Il cavo coassiale, DC per le <a href="/wiki/Trasmissione_analogica" title="Trasmissione analogica">trasmissioni analogiche</a> e simile al cavo che trasporta i segnali <a href="/wiki/Radio_(elettronica)" title="Radio (elettronica)">radio</a> e <a href="/wiki/TV" class="mw-redirect" title="TV">TV</a> su lunghe distanze, fu in seguito adattato alla <a href="/wiki/Trasmissione_digitale" title="Trasmissione digitale">comunicazione dati digitali</a>. I dati digitali sono molto più suscettibili rispetto ai dati analogici al <a href="/wiki/Rumore_(elettronica)" title="Rumore (elettronica)">rumore</a> e alle <a href="/wiki/Distorsione_(fisica)" title="Distorsione (fisica)">distorsioni</a> di segnale che vengono introdotte quando i segnali viaggiano su grandi distanze. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:RG-59.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/RG-59.jpg/310px-RG-59.jpg" decoding="async" width="310" height="217" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/RG-59.jpg/465px-RG-59.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/RG-59.jpg/620px-RG-59.jpg 2x" data-file-width="705" data-file-height="493" /></a><figcaption>Cavo coassiale <a href="/wiki/RG-59" title="RG-59">RG-59</a> <br /><b>A</b>: guaina esterna di plastica<br /><b>B</b>: maglia di rame intrecciata o massa<br /><b>C</b>: isolante dielettrico interno<br /><b>D</b>: nucleo di rame o polo caldo</figcaption></figure> <p>Quindi, le reti che usano come mezzo trasmissivo il cavo coassiale possono estendersi solo per distanze limitate a meno che non vengano utilizzati dei <a href="/wiki/Ripetitore" title="Ripetitore">ripetitori</a> di segnale che rigenerano il segnale periodicamente (<i>repeater</i>). Semplici <a href="/wiki/Amplificatore" title="Amplificatore">amplificatori</a> non sarebbero adatti, perché questi amplificherebbero anche il rumore e la distorsione che il segnale raccoglie mentre viaggia sul mezzo. </p><p>Per molto tempo il cavo coassiale è stata inoltre la sola scelta economica da usare nella <a href="/wiki/Cablaggio" title="Cablaggio">cablatura</a> di <a href="/wiki/Rete_locale" class="mw-redirect" title="Rete locale">reti locali</a> ad alta <a href="/wiki/Velocit%C3%A0_di_trasmissione" title="Velocità di trasmissione">velocità</a> perché rispetto al classico <a href="/wiki/Doppino" class="mw-redirect" title="Doppino">doppino</a> garantisce una <a href="/wiki/Ampiezza_di_banda" class="mw-redirect" title="Ampiezza di banda">capacità di banda</a> e dunque una <a href="/wiki/Velocit%C3%A0_di_trasmissione" title="Velocità di trasmissione">velocità di trasmissione</a> superiore. </p><p>Gli svantaggi di installare e mantenere un sistema in cavo coassiale includono il fatto che il cavo è complesso e costoso da fabbricare, è difficile da utilizzare in spazi confinati in quanto non può essere piegato eccessivamente intorno ad angoli stretti ed è soggetto a frequenti rotture meccaniche ai connettori. In tali ambiti il cavo coassiale è stato soppiantato dalla <a href="/wiki/Fibra_ottica" title="Fibra ottica">fibra ottica</a> e dalle relative <a href="/wiki/Comunicazioni_ottiche" title="Comunicazioni ottiche">comunicazioni ottiche</a>. </p> <table class="wikitable"> <tbody><tr> <th colspan="8">Cavi coassiali serie TV adatti alla trasmissione </th></tr> <tr> <th>Tipo </th> <th>CU 22 </th> <th>ST 22 </th> <th>AG 22 </th> <th>CU 33 </th> <th>ST 33 </th> <th>AG 33 </th> <th>AG 60 </th></tr> <tr> <th>Impedenza caratteristica <p>in ohm </p><p><a href="/wiki/Fattore_di_velocit%C3%A0" title="Fattore di velocità">Velocità di propagazione</a> % </p><p>Capacità in pF/m </p> </th> <td>75 <p>±5% </p><p>66 </p><p>67 </p> </td> <td>75 <p>±5% </p><p>66 </p><p>67 </p> </td> <td>75 <p>±5% </p><p>66 </p><p>67 </p> </td> <td>75 <p>±5% </p><p>66 </p><p>67 </p> </td> <td>75 <p>±5% </p><p>66 </p><p>67 </p> </td> <td>75 <p>±5% </p><p>66 </p><p>67 </p> </td> <td>75 <p>±5% </p><p>66 </p><p>82 </p> </td></tr> <tr> <th>Attenuazione in dB/100 m <p>a 100 MHz </p><p>a 200 MHz </p><p>a 400 MHz </p><p>a 500 MHz </p><p>a 800 MHz </p> </th> <td> <p>10 </p><p>14 </p><p>21 </p><p>24 </p><p>29 </p> </td> <td> <p>10 </p><p>14 </p><p>21 </p><p>24 </p><p>29 </p> </td> <td> <p>9 </p><p>13 </p><p>20 </p><p>23 </p><p>28 </p> </td> <td> <p>8 </p><p>12 </p><p>18,5 </p><p>21 </p><p>27 </p> </td> <td> <p>8 </p><p>12 </p><p>18,5 </p><p>21 </p><p>27 </p> </td> <td> <p>7,5 </p><p>11,5 </p><p>18 </p><p>20 </p><p>26 </p> </td> <td> <p>9,5 </p><p>13,5 </p><p>19,5 </p><p>21,5 </p><p>27,5 </p> </td></tr> <tr> <th>Conduttore interno Ø mm </th> <td>0,65 </td> <td>0,65 </td> <td>0,65 </td> <td>0,80 </td> <td>0,80 </td> <td>0,80 </td> <td>0,90 </td></tr> <tr> <th>Dielettrico in polietilene </th> <td>Compatto </td> <td>Compatto </td> <td>Compatto </td> <td>Compatto </td> <td>Compatto </td> <td>Compatto </td> <td>Compatto </td></tr> <tr> <th>Guaina esterna </th> <td>PVC </td> <td>PVC </td> <td>PVC </td> <td>PVC </td> <td>PVC </td> <td>PVC </td> <td>PVC </td></tr> <tr> <th>Dimensioni esterne Ø mm </th> <td>5,8 </td> <td>5,8 </td> <td>5,8 </td> <td>6,8 </td> <td>6,8 </td> <td>6,8 </td> <td>5,8 </td></tr> <tr> <th>Peso per 1000 m in kg </th> <td>37 </td> <td>37 </td> <td>37 </td> <td>50 </td> <td>50 </td> <td>50 </td> <td>40 </td></tr> <tr> <th>Trattamento rame </th> <td>- </td> <td>Stagnato </td> <td>Argentato </td> <td>- </td> <td>Stagnato </td> <td>Argentato </td> <td>Argentato </td></tr> <tr> <th>Antimigrante </th> <td>Sì </td> <td>Sì </td> <td>Sì </td> <td>Sì </td> <td>Sì </td> <td>Sì </td> <td>Sì </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Trattazione_matematica">Trattazione matematica</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=3" title="Modifica la sezione Trattazione matematica" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=3" title="Edit section's source code: Trattazione matematica"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Si consideri un cavo coassiale formato da due cilindri cavi di raggio <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>a</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ffd2487510aa438433a2579450ab2b3d557e5edc" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.23ex; height:1.676ex;" alt="{\displaystyle a}"></span> e <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\textstyle b}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mi>b</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\textstyle b}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/73a780b69dfc55238880ef18a134dc65260877e2" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.998ex; height:2.176ex;" alt="{\textstyle b}"></span> (con <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a<b}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>a</mi> <mo><</mo> <mi>b</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a<b}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/91a7698e4c7401bb321f97888b872b583a9e4642" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:5.326ex; height:2.176ex;" alt="{\displaystyle a<b}"></span>). Il cilindro interno ha una <a href="/wiki/Capacit%C3%A0_elettrica" title="Capacità elettrica">capacità</a> per unità di lunghezza <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/23da38e31194b9ae0524ec18c8489693f3be5389" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.716ex; height:2.509ex;" alt="{\displaystyle C_{0}}"></span> e un'<a href="/wiki/Induttanza" title="Induttanza">induttanza</a> per unità di lunghezza <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/db742b8c210fc611329a4c2dcc3af4b4e1a110cb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.637ex; height:2.509ex;" alt="{\displaystyle L_{0}}"></span>. </p><p>Considerando un tratto infinitesimo del conduttore, di lunghezza <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {d} x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {d} x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0b637d7a6d64d797391d40ceae9e8696e5d76f15" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.622ex; height:2.176ex;" alt="{\displaystyle \mathrm {d} x}"></span>, la caduta di potenziale dovuta all'induttanza nel tratto vale </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {d} V=-L_{0}\,\mathrm {d} x\,{\frac {\partial i}{\partial t}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>V</mi> <mo>=</mo> <mo>−</mo> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>x</mi> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>i</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {d} V=-L_{0}\,\mathrm {d} x\,{\frac {\partial i}{\partial t}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/68eb8ed2f9a8ef799e82e710e5645a323dab6434" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:17.014ex; height:5.509ex;" alt="{\displaystyle \mathrm {d} V=-L_{0}\,\mathrm {d} x\,{\frac {\partial i}{\partial t}}}"></span> </p><p>dove <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>i</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle i}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/add78d8608ad86e54951b8c8bd6c8d8416533d20" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.802ex; height:2.176ex;" alt="{\displaystyle i}"></span> è la corrente circolante. </p><p>Viceversa, a causa della capacità, essendo <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i={\dot {q}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>i</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mover> <mi>q</mi> <mo>˙</mo> </mover> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle i={\dot {q}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/506ea6d701eb04c19b20b0db8b7f22ccfe417fdd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:5.278ex; height:2.509ex;" alt="{\displaystyle i={\dot {q}}}"></span> e <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle q=C\Delta V}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>q</mi> <mo>=</mo> <mi>C</mi> <mi mathvariant="normal">Δ</mi> <mi>V</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle q=C\Delta V}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e9cf604a320bd614cd2cf5c900cc960a93c74428" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:9.657ex; height:2.509ex;" alt="{\displaystyle q=C\Delta V}"></span>, </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {d} I=-C_{0}\,\mathrm {d} x\,{\frac {\partial V}{\partial t}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>I</mi> <mo>=</mo> <mo>−</mo> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>x</mi> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>V</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {d} I=-C_{0}\,\mathrm {d} x\,{\frac {\partial V}{\partial t}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1579e1a0e83323449caea07ce653b90beff9d786" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:17.425ex; height:5.509ex;" alt="{\displaystyle \mathrm {d} I=-C_{0}\,\mathrm {d} x\,{\frac {\partial V}{\partial t}}}"></span> </p><p>da cui </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {\partial V}{\partial x}}=-L_{0}\,{\frac {\partial i}{\partial t}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>V</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>x</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <mo>−</mo> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>i</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {\partial V}{\partial x}}=-L_{0}\,{\frac {\partial i}{\partial t}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a8ff94fd163152cc93a16744bb18b454dc8c2b92" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:14.866ex; height:5.509ex;" alt="{\displaystyle {\frac {\partial V}{\partial x}}=-L_{0}\,{\frac {\partial i}{\partial t}}}"></span> </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {\partial i}{\partial x}}=-C_{0}\,{\frac {\partial V}{\partial t}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>i</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>x</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <mo>−</mo> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>V</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {\partial i}{\partial x}}=-C_{0}\,{\frac {\partial V}{\partial t}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ae828c751132efb7c9d049748ea7d29690524c2e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:15.435ex; height:5.509ex;" alt="{\displaystyle {\frac {\partial i}{\partial x}}=-C_{0}\,{\frac {\partial V}{\partial t}}}"></span> </p><p>Derivando le due equazioni rispetto a <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle x}"></span> e sostituendo si ottiene </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {\partial ^{2}V}{\partial x^{2}}}=-L_{0}\,{\frac {\partial }{\partial t}}\,{\frac {\partial i}{\partial x}}=L_{0}C_{0}{\frac {\partial ^{2}V}{\partial t^{2}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mi mathvariant="normal">∂</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>V</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <msup> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> <mo>=</mo> <mo>−</mo> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi mathvariant="normal">∂</mi> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>i</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>x</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mi mathvariant="normal">∂</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>V</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <msup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {\partial ^{2}V}{\partial x^{2}}}=-L_{0}\,{\frac {\partial }{\partial t}}\,{\frac {\partial i}{\partial x}}=L_{0}C_{0}{\frac {\partial ^{2}V}{\partial t^{2}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b389294d83448dc2f2583b228721681fb92bce1a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.171ex; width:33.289ex; height:6.009ex;" alt="{\displaystyle {\frac {\partial ^{2}V}{\partial x^{2}}}=-L_{0}\,{\frac {\partial }{\partial t}}\,{\frac {\partial i}{\partial x}}=L_{0}C_{0}{\frac {\partial ^{2}V}{\partial t^{2}}}}"></span> </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {\partial ^{2}i}{\partial x^{2}}}=-C_{0}\,{\frac {\partial }{\partial t}}\,{\frac {\partial V}{\partial x}}=L_{0}C_{0}{\frac {\partial ^{2}i}{\partial t^{2}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mi mathvariant="normal">∂</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>i</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <msup> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> <mo>=</mo> <mo>−</mo> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi mathvariant="normal">∂</mi> <mrow> <mi mathvariant="normal">∂</mi> <mi>t</mi> </mrow> </mfrac> </mrow> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi mathvariant="normal">∂</mi> <mi>V</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <mi>x</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mi mathvariant="normal">∂</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>i</mi> </mrow> <mrow> <mi mathvariant="normal">∂</mi> <msup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {\partial ^{2}i}{\partial x^{2}}}=-C_{0}\,{\frac {\partial }{\partial t}}\,{\frac {\partial V}{\partial x}}=L_{0}C_{0}{\frac {\partial ^{2}i}{\partial t^{2}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9f23c1c8c00d461176b199869fcd84d8367990ce" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.171ex; width:32.37ex; height:6.009ex;" alt="{\displaystyle {\frac {\partial ^{2}i}{\partial x^{2}}}=-C_{0}\,{\frac {\partial }{\partial t}}\,{\frac {\partial V}{\partial x}}=L_{0}C_{0}{\frac {\partial ^{2}i}{\partial t^{2}}}}"></span> </p><p>che rappresentano, secondo l'<a href="/wiki/Equazione_delle_onde" title="Equazione delle onde">equazione di d'Alembert</a> due onde che si propagano alla velocità </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle v={\frac {1}{\sqrt {L_{0}C_{0}}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>v</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msqrt> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </msqrt> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle v={\frac {1}{\sqrt {L_{0}C_{0}}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/855cb44e9035704ad8970bd980b89a0f3ffd7595" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:12.739ex; height:6.509ex;" alt="{\displaystyle v={\frac {1}{\sqrt {L_{0}C_{0}}}}}"></span> </p><p>La corrente e la differenza di potenziale sono poi legate dalla relazione <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle V=Zi}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>V</mi> <mo>=</mo> <mi>Z</mi> <mi>i</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle V=Zi}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c4ac3fa5df73324f1622cc4fca299213590d8b42" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:7.369ex; height:2.176ex;" alt="{\displaystyle V=Zi}"></span>, in cui <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle Z}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>Z</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle Z}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1cc6b75e09a8aa3f04d8584b11db534f88fb56bd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.68ex; height:2.176ex;" alt="{\displaystyle Z}"></span> è l'impedenza. </p><p>In un <a href="/wiki/Circuito_LC" title="Circuito LC">circuito LC</a>, l'<a href="/wiki/Impedenza" title="Impedenza">impedenza</a> vale </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle Z={\sqrt {L/C}}={\sqrt {L_{0}/C_{0}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>Z</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>C</mi> </msqrt> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </msqrt> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle Z={\sqrt {L/C}}={\sqrt {L_{0}/C_{0}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1e922ed1c11d7bd8af784fa3d7921b7f4fa43d58" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:23.552ex; height:4.843ex;" alt="{\displaystyle Z={\sqrt {L/C}}={\sqrt {L_{0}/C_{0}}}}"></span> </p><p>ed è un numero reale. </p><p>Per trovare il valore di <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle v}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>v</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle v}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e07b00e7fc0847fbd16391c778d65bc25c452597" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.128ex; height:1.676ex;" alt="{\displaystyle v}"></span> e di <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle Z}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>Z</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle Z}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1cc6b75e09a8aa3f04d8584b11db534f88fb56bd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.68ex; height:2.176ex;" alt="{\displaystyle Z}"></span> in un cavo coassiale è dunque necessario calcolare <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/db742b8c210fc611329a4c2dcc3af4b4e1a110cb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.637ex; height:2.509ex;" alt="{\displaystyle L_{0}}"></span> e <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/23da38e31194b9ae0524ec18c8489693f3be5389" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.716ex; height:2.509ex;" alt="{\displaystyle C_{0}}"></span>. </p><p>L'induttanza <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/db742b8c210fc611329a4c2dcc3af4b4e1a110cb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.637ex; height:2.509ex;" alt="{\displaystyle L_{0}}"></span> può essere calcolata ricordando che l'energia del campo magnetico vale <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle U_{m}={\frac {1}{2}}Li^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>U</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>m</mi> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> <mi>L</mi> <msup> <mi>i</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle U_{m}={\frac {1}{2}}Li^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c975ca18f54d79e2a87d364ffd2e91ad794e4667" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:11.799ex; height:5.176ex;" alt="{\displaystyle U_{m}={\frac {1}{2}}Li^{2}}"></span> e che tale valore è uguale all'integrale sul volume della densità del campo magnetico, data da <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {B^{2}}{2\mu _{0}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msup> <mi>B</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mrow> <mn>2</mn> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {B^{2}}{2\mu _{0}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/75f39e31984c588f2f97add3880f7d0ebbefd4cd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:4.455ex; height:6.176ex;" alt="{\displaystyle {\frac {B^{2}}{2\mu _{0}}}}"></span>. </p><p>Se la corrente che scorre sul conduttore è pari a <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>i</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle i}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/add78d8608ad86e54951b8c8bd6c8d8416533d20" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.802ex; height:2.176ex;" alt="{\displaystyle i}"></span>, detta <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle r}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>r</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0d1ecb613aa2984f0576f70f86650b7c2a132538" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.049ex; height:1.676ex;" alt="{\displaystyle r}"></span> la distanza dall'asse del cilindro, il campo magnetico vale (<a href="/wiki/Legge_di_Biot-Savart" title="Legge di Biot-Savart">legge di Biot-Savart</a>) </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle B={\frac {\mu _{0}i}{2\pi r}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>B</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mi>i</mi> </mrow> <mrow> <mn>2</mn> <mi>π</mi> <mi>r</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle B={\frac {\mu _{0}i}{2\pi r}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f303549f7fb4c60713df9da6c1ae6364d35df0bf" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:9.242ex; height:5.343ex;" alt="{\displaystyle B={\frac {\mu _{0}i}{2\pi r}}}"></span> </p><p>quindi, considerando dei cilindri cavi di lunghezza <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle l}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>l</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle l}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/829091f745070b9eb97a80244129025440a1cfac" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.693ex; height:2.176ex;" alt="{\displaystyle l}"></span> e spessore <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {d} r}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>r</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {d} r}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/6061c91ecd3f8919bce745870bb757249fe26bc3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.341ex; height:2.176ex;" alt="{\displaystyle \mathrm {d} r}"></span>, </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle U_{m}={\frac {1}{2}}Li^{2}=\int _{\tau }{\frac {B^{2}}{2\mu _{0}}}\mathrm {d} \tau =\int _{\tau }{\frac {\mu _{0}i^{2}}{8\pi ^{2}r^{2}}}\mathrm {d} \tau ={\frac {\mu _{0}i^{2}}{8\pi ^{2}}}\int _{a}^{b}{\frac {1}{r^{2}}}l\,2\pi r\mathrm {d} r={\frac {\mu _{0}i^{2}l}{4\pi }}\int _{a}^{b}{\frac {1}{r}}\mathrm {d} r={\frac {\mu _{0}i^{2}l}{4\pi }}\ln {\frac {b}{a}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>U</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>m</mi> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> <mi>L</mi> <msup> <mi>i</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>=</mo> <msub> <mo>∫</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>τ</mi> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msup> <mi>B</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mrow> <mn>2</mn> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mrow> </mfrac> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>τ</mi> <mo>=</mo> <msub> <mo>∫</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>τ</mi> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msup> <mi>i</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> <mrow> <mn>8</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>τ</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msup> <mi>i</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> <mrow> <mn>8</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mrow> </mfrac> </mrow> <msubsup> <mo>∫</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>a</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>b</mi> </mrow> </msubsup> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msup> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mfrac> </mrow> <mi>l</mi> <mspace width="thinmathspace" /> <mn>2</mn> <mi>π</mi> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>r</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msup> <mi>i</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>l</mi> </mrow> <mrow> <mn>4</mn> <mi>π</mi> </mrow> </mfrac> </mrow> <msubsup> <mo>∫</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>a</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>b</mi> </mrow> </msubsup> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>r</mi> </mfrac> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>r</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msup> <mi>i</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mi>l</mi> </mrow> <mrow> <mn>4</mn> <mi>π</mi> </mrow> </mfrac> </mrow> <mi>ln</mi> <mo>⁡</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>b</mi> <mi>a</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle U_{m}={\frac {1}{2}}Li^{2}=\int _{\tau }{\frac {B^{2}}{2\mu _{0}}}\mathrm {d} \tau =\int _{\tau }{\frac {\mu _{0}i^{2}}{8\pi ^{2}r^{2}}}\mathrm {d} \tau ={\frac {\mu _{0}i^{2}}{8\pi ^{2}}}\int _{a}^{b}{\frac {1}{r^{2}}}l\,2\pi r\mathrm {d} r={\frac {\mu _{0}i^{2}l}{4\pi }}\int _{a}^{b}{\frac {1}{r}}\mathrm {d} r={\frac {\mu _{0}i^{2}l}{4\pi }}\ln {\frac {b}{a}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/eccb74b1a4b703de383ee3475fc995ed04fa8288" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:92.956ex; height:6.343ex;" alt="{\displaystyle U_{m}={\frac {1}{2}}Li^{2}=\int _{\tau }{\frac {B^{2}}{2\mu _{0}}}\mathrm {d} \tau =\int _{\tau }{\frac {\mu _{0}i^{2}}{8\pi ^{2}r^{2}}}\mathrm {d} \tau ={\frac {\mu _{0}i^{2}}{8\pi ^{2}}}\int _{a}^{b}{\frac {1}{r^{2}}}l\,2\pi r\mathrm {d} r={\frac {\mu _{0}i^{2}l}{4\pi }}\int _{a}^{b}{\frac {1}{r}}\mathrm {d} r={\frac {\mu _{0}i^{2}l}{4\pi }}\ln {\frac {b}{a}}}"></span> </p><p>Integrando e semplificando si ottiene </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L_{0}=L/l={\frac {\mu _{0}}{2\pi }}\ln(b/a)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>=</mo> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>l</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mrow> <mn>2</mn> <mi>π</mi> </mrow> </mfrac> </mrow> <mi>ln</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>b</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>a</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{0}=L/l={\frac {\mu _{0}}{2\pi }}\ln(b/a)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8beb935f3aa312928b848642e95f3bdf0cf1646a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:23.129ex; height:4.843ex;" alt="{\displaystyle L_{0}=L/l={\frac {\mu _{0}}{2\pi }}\ln(b/a)}"></span> </p><p>Per un condensatore cilindrico, invece, la capacità vale </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C={\frac {2\pi \varepsilon _{0}l}{\ln(b/a)}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>2</mn> <mi>π</mi> <msub> <mi>ε</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mi>l</mi> </mrow> <mrow> <mi>ln</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>b</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>a</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C={\frac {2\pi \varepsilon _{0}l}{\ln(b/a)}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4deb67335c736ce13b8a07f1b2702e21ff631c2b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:12.839ex; height:6.176ex;" alt="{\displaystyle C={\frac {2\pi \varepsilon _{0}l}{\ln(b/a)}}}"></span>, </p><p>da cui, dividendo per <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle l}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>l</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle l}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/829091f745070b9eb97a80244129025440a1cfac" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.693ex; height:2.176ex;" alt="{\displaystyle l}"></span>, si ricava </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C_{0}={\frac {2\pi \varepsilon _{0}}{\ln(b/a)}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>2</mn> <mi>π</mi> <msub> <mi>ε</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mrow> <mrow> <mi>ln</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>b</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>a</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C_{0}={\frac {2\pi \varepsilon _{0}}{\ln(b/a)}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/db65222611bb062d86eacd4aa9bb1cb92866c98a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:13.789ex; height:6.009ex;" alt="{\displaystyle C_{0}={\frac {2\pi \varepsilon _{0}}{\ln(b/a)}}}"></span> </p><p>Pertanto </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle v={\frac {1}{\sqrt {L_{0}C_{0}}}}={\frac {1}{\sqrt {\mu _{0}\varepsilon _{0}}}}=c}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>v</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msqrt> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </msqrt> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msqrt> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>ε</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </msqrt> </mfrac> </mrow> <mo>=</mo> <mi>c</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle v={\frac {1}{\sqrt {L_{0}C_{0}}}}={\frac {1}{\sqrt {\mu _{0}\varepsilon _{0}}}}=c}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e8a477d2fc6192706b82d306f60c8d2bb8c462df" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:27.309ex; height:6.509ex;" alt="{\displaystyle v={\frac {1}{\sqrt {L_{0}C_{0}}}}={\frac {1}{\sqrt {\mu _{0}\varepsilon _{0}}}}=c}"></span> </p><p>Ciò significa che, assumendo che l'interno del cavo sia vuoto, il segnale si trasmette alla <a href="/wiki/Velocit%C3%A0_della_luce" title="Velocità della luce">velocità della luce</a>, o, se riempito da un dielettrico, alla velocità della luce in tale mezzo. </p><p>Viceversa, per l'impedenza si ottiene </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle Z={\sqrt {L_{0}/C_{0}}}={\sqrt {\frac {\mu _{0}}{\varepsilon _{0}}}}{\frac {\ln(b/a)}{2\pi }}=Z_{0}{\frac {\ln(b/a)}{2\pi }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>Z</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <msub> <mi>C</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </msqrt> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <mfrac> <msub> <mi>μ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <msub> <mi>ε</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mfrac> </msqrt> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>ln</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>b</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>a</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mn>2</mn> <mi>π</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <msub> <mi>Z</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>ln</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>b</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>a</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mn>2</mn> <mi>π</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle Z={\sqrt {L_{0}/C_{0}}}={\sqrt {\frac {\mu _{0}}{\varepsilon _{0}}}}{\frac {\ln(b/a)}{2\pi }}=Z_{0}{\frac {\ln(b/a)}{2\pi }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/fb72142a8ac65536578fead6112a4700dd55d15e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:44.022ex; height:6.509ex;" alt="{\displaystyle Z={\sqrt {L_{0}/C_{0}}}={\sqrt {\frac {\mu _{0}}{\varepsilon _{0}}}}{\frac {\ln(b/a)}{2\pi }}=Z_{0}{\frac {\ln(b/a)}{2\pi }}}"></span> </p><p>dove <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle Z_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>Z</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle Z_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/bfcd49ab63d30163ac54e60a8e24ff9ccd7bcd44" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.642ex; height:2.509ex;" alt="{\displaystyle Z_{0}}"></span> è l'<a href="/wiki/Impedenza_caratteristica_del_vuoto" title="Impedenza caratteristica del vuoto">impedenza caratteristica del vuoto</a> (pari a circa <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 377\,\Omega }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>377</mn> <mspace width="thinmathspace" /> <mi mathvariant="normal">Ω</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 377\,\Omega }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9938d045acb1424967a14dd2ba8a659d63017ec9" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:5.553ex; height:2.176ex;" alt="{\displaystyle 377\,\Omega }"></span>), da sostituire opportunamente con l'impedenza specifica dell'eventuale dielettrico inserito nel cavo.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=4" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=4" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text"><a rel="nofollow" class="external text" href="https://spiegato.com/che-cose-un-cavo-rf">Che cos’è un cavo RF?</a></span> </li> <li id="cite_note-2"><a href="#cite_ref-2"><b>^</b></a> <span class="reference-text"><cite class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a href="/wiki/Richard_Feynman" title="Richard Feynman">Richard P. Feynman</a>, <a rel="nofollow" class="external text" href="http://www.feynmanlectures.caltech.edu/II_24.html"><span style="font-style:italic;">The Feynman Lectures on Physics</span></a>, su <span style="font-style:italic;">feynmanlectures.caltech.edu</span>, II, cap. 24, caltech.edu, 1964. <small>URL consultato il 28 maggio 2015</small>.</cite></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=5" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=5" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Doppino" class="mw-redirect" title="Doppino">Doppino</a></li> <li><a href="/wiki/Fibra_ottica" title="Fibra ottica">Fibra ottica</a></li> <li><a href="/wiki/Linea_di_trasmissione" title="Linea di trasmissione">Linea di trasmissione</a></li> <li><a href="/wiki/Presa_RF" class="mw-redirect" title="Presa RF">Presa RF</a></li> <li><a href="/wiki/RG-58" title="RG-58">RG-58</a></li> <li><a href="/wiki/RG-59" title="RG-59">RG-59</a></li> <li><a href="/wiki/Segnale_video" class="mw-redirect" title="Segnale video">Segnale video</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=6" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=6" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; color: black; font-weight: bold; margin: 0"><span>Altri progetti</span></p><ul title="Collegamenti verso gli altri progetti Wikimedia"> <li class="" title=""><span class="plainlinks" title="commons:Category:Coaxial cables"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Coaxial_cables?uselang=it">Wikimedia Commons</a></span></li></ul></div> <ul><li><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/?uselang=it" title="Collabora a Wikimedia Commons"><img alt="Collabora a Wikimedia Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png" decoding="async" width="18" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/27px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/36px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/?uselang=it">Wikimedia Commons</a></span> contiene immagini o altri file sul <b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Coaxial_cables?uselang=it">cavo coassiale</a></span></b></li></ul> <div class="mw-heading mw-heading2"><h2 id="Collegamenti_esterni">Collegamenti esterni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cavo_coassiale&veaction=edit&section=7" title="Modifica la sezione Collegamenti esterni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cavo_coassiale&action=edit&section=7" title="Edit section's source code: Collegamenti esterni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li class="mw-empty-elt"></li> <li><cite id="CITEREFBritannica.com" class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="https://www.britannica.com/technology/coaxial-cable"><span style="font-style:italic;">coaxial cable</span></a> / <a rel="nofollow" class="external text" href="https://www.britannica.com/technology/rigid-coaxial-cable"><span style="font-style:italic;">rigid coaxial cable</span></a>, su <span style="font-style:italic;"><a href="/wiki/Enciclopedia_Britannica" title="Enciclopedia Britannica">Enciclopedia Britannica</a></span>, Encyclopædia Britannica, Inc.</cite> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q183389#P1417" title="Modifica su Wikidata"><img alt="Modifica su Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/10px-Blue_pencil.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/15px-Blue_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/20px-Blue_pencil.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></li> <li><cite id="CITEREFOpen_Library" class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="https://openlibrary.org/subjects/coaxial_cables"><span style="font-style:italic;">Opere riguardanti Coaxial cables</span></a>, su <span style="font-style:italic;"><a href="/wiki/Open_Library" class="mw-redirect" title="Open Library">Open Library</a></span>, <a href="/wiki/Internet_Archive" title="Internet Archive">Internet Archive</a>.</cite> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q183389#P3847" title="Modifica su Wikidata"><img alt="Modifica su Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/10px-Blue_pencil.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/15px-Blue_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/20px-Blue_pencil.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></li></ul> <style data-mw-deduplicate="TemplateStyles:r141815314">.mw-parser-output .navbox{border:1px solid #aaa;clear:both;margin:auto;padding:2px;width:100%}.mw-parser-output .navbox th{padding-left:1em;padding-right:1em;text-align:center}.mw-parser-output .navbox>tbody>tr:first-child>th{background:#ccf;font-size:90%;width:100%;color:var(--color-base,black)}.mw-parser-output .navbox_navbar{float:left;margin:0;padding:0 10px 0 0;text-align:left;width:6em}.mw-parser-output .navbox_title{font-size:110%}.mw-parser-output .navbox_abovebelow{background:#ddf;font-size:90%;font-weight:normal}.mw-parser-output .navbox_group{background:#ddf;font-size:90%;padding:0 10px;white-space:nowrap}.mw-parser-output .navbox_list{font-size:90%;width:100%}.mw-parser-output .navbox_list a{white-space:nowrap}html:not(.vector-feature-night-mode-enabled) .mw-parser-output .navbox_odd{background:#fdfdfd;color:var(--color-base,black)}html:not(.vector-feature-night-mode-enabled) .mw-parser-output .navbox_even{background:#f7f7f7;color:var(--color-base,black)}.mw-parser-output .navbox a.mw-selflink{color:var(--color-base,black)}.mw-parser-output .navbox_center{text-align:center}.mw-parser-output .navbox .navbox_image{padding-left:7px;vertical-align:middle;width:0}.mw-parser-output .navbox+.navbox{margin-top:-1px}.mw-parser-output .navbox .mw-collapsible-toggle{font-weight:normal;text-align:right;width:7em}body.skin--responsive .mw-parser-output .navbox_image img{max-width:none!important}.mw-parser-output .subnavbox{margin:-3px;width:100%}.mw-parser-output .subnavbox_group{background:#e6e6ff;padding:0 10px}@media screen{html.skin-theme-clientpref-night .mw-parser-output .navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-night .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-night .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-night .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-night .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-os .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-os .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}</style><table class="navbox mw-collapsible mw-collapsed noprint metadata" id="navbox-Suite_di_protocolli_Internet"><tbody><tr><th colspan="2"><div class="navbox_navbar"><div class="noprint plainlinks" style="background-color:transparent; padding:0; font-size:xx-small; color:var(--color-base, #000000); white-space:nowrap;"><a href="/wiki/Template:Suite_di_protocolli_Internet" title="Template:Suite di protocolli Internet"><span title="Vai alla pagina del template">V</span></a> · <a href="/wiki/Discussioni_template:Suite_di_protocolli_Internet" title="Discussioni template:Suite di protocolli Internet"><span title="Discuti del template">D</span></a> · <a class="external text" href="https://it.wikipedia.org/w/index.php?title=Template:Suite_di_protocolli_Internet&action=edit"><span title="Modifica il template. Usa l'anteprima prima di salvare">M</span></a></div></div><span class="navbox_title"><a href="/wiki/Suite_di_protocolli_Internet" title="Suite di protocolli Internet">Suite di protocolli Internet</a></span></th></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Livello_di_applicazione" title="Livello di applicazione">Livello di applicazione</a></th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/File_Transfer_Protocol" title="File Transfer Protocol">FTP</a><b> ·</b> <a href="/wiki/Hypertext_Transfer_Protocol" title="Hypertext Transfer Protocol">HTTP</a><b> ·</b> <a href="/wiki/HTTP/2" title="HTTP/2">HTTP/2</a><b> ·</b> <a href="/wiki/HTTP/3" title="HTTP/3">HTTP/3</a><b> ·</b> <a href="/wiki/HTTPS" title="HTTPS">HTTPS</a><b> ·</b> <a href="/wiki/Network_News_Transfer_Protocol" title="Network News Transfer Protocol">NNTP</a><b> ·</b> <a href="/wiki/Dynamic_Host_Configuration_Protocol" title="Dynamic Host Configuration Protocol">DHCP</a><b> ·</b> <a href="/wiki/Domain_Name_System" title="Domain Name System">DNS</a><b> ·</b> <a href="/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol">SMTP</a><b> ·</b> <a href="/wiki/Post_Office_Protocol" title="Post Office Protocol">POP3</a><b> ·</b> <a href="/wiki/Internet_Message_Access_Protocol" title="Internet Message Access Protocol">IMAP</a><b> ·</b> <a href="/wiki/Telnet" title="Telnet">Telnet</a><b> ·</b> <a href="/wiki/Secure_Shell" title="Secure Shell">SSH</a><b> ·</b> <a href="/wiki/SSH_File_Transfer_Protocol" title="SSH File Transfer Protocol">SFTP</a><b> ·</b> <a href="/wiki/Trivial_File_Transfer_Protocol" title="Trivial File Transfer Protocol">TFTP</a><b> ·</b> <a href="/wiki/Internet_Relay_Chat" title="Internet Relay Chat">IRC</a><b> ·</b> <a href="/wiki/Simple_Network_Management_Protocol" title="Simple Network Management Protocol">SNMP</a><b> ·</b> <a href="/wiki/Voice_over_IP" title="Voice over IP">VoIP</a><b> ·</b> <a href="/wiki/Session_Initiation_Protocol" title="Session Initiation Protocol">SIP</a><b> ·</b> <a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">RTP</a><b> ·</b> <a href="/wiki/Real_Time_Streaming_Protocol" title="Real Time Streaming Protocol">RTSP</a><b> ·</b> <a href="/wiki/Rsync" title="Rsync">Rsync</a><b> ·</b> <a href="/wiki/Hot_Standby_Router_Protocol" title="Hot Standby Router Protocol">HSRP</a><b> ·</b> <a href="/wiki/Routing_Information_Protocol" title="Routing Information Protocol">RIP</a><b> ·</b> <a href="/wiki/Border_Gateway_Protocol" title="Border Gateway Protocol">BGP</a><b> ·</b> <a href="/wiki/Interior_Gateway_Routing_Protocol" title="Interior Gateway Routing Protocol">IGRP</a><b> ·</b> <a href="/wiki/Categoria:Protocolli_livello_applicazione" title="Categoria:Protocolli livello applicazione"><i>altro..</i></a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Livello_di_trasporto" title="Livello di trasporto">Livello di trasporto</a></th><td colspan="1" class="navbox_list navbox_even"><a href="/wiki/Transmission_Control_Protocol" title="Transmission Control Protocol">TCP</a><b> ·</b> <a href="/wiki/User_Datagram_Protocol" title="User Datagram Protocol">UDP</a><b> ·</b> <a href="/wiki/Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a><b> ·</b> <a href="/wiki/Datagram_Congestion_Control_Protocol" title="Datagram Congestion Control Protocol">DCCP</a><b> ·</b> <a href="/wiki/Categoria:Protocolli_livello_trasporto" title="Categoria:Protocolli livello trasporto"><i>altro..</i></a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Livello_di_rete" title="Livello di rete">Livello di rete</a></th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/Internet_Protocol" title="Internet Protocol">IP</a> (<a href="/wiki/IPv4" title="IPv4">IPv4</a><b> ·</b> <a href="/wiki/IPv6" title="IPv6">IPv6</a>)<b> ·</b> <a href="/wiki/Internet_Control_Message_Protocol" title="Internet Control Message Protocol">ICMP</a> (<a href="/wiki/ICMPv6" title="ICMPv6">ICMPv6</a>)<b> ·</b> <a href="/wiki/Internet_Group_Management_Protocol" title="Internet Group Management Protocol">IGMP</a><b> ·</b> <a href="/wiki/IPsec" title="IPsec">IPsec</a><b> ·</b> <a href="/wiki/Open_Shortest_Path_First" title="Open Shortest Path First">OSPF</a><b> ·</b> <a href="/wiki/Categoria:Protocolli_livello_rete" title="Categoria:Protocolli livello rete"><i>altro..</i></a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Livello_di_accesso_alla_rete" title="Livello di accesso alla rete">Livello di accesso alla rete</a> (<a href="/wiki/Logical_link_control" title="Logical link control">LLC</a> <b> ·</b> <a href="/wiki/Media_Access_Control" title="Media Access Control">MAC</a>)</th><td colspan="1" class="navbox_list navbox_even"><a href="/wiki/Address_Resolution_Protocol" title="Address Resolution Protocol">ARP</a><b> ·</b> <a href="/wiki/Reverse_Address_Resolution_Protocol" title="Reverse Address Resolution Protocol">RARP</a><b> ·</b> <a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a><b> ·</b> <a href="/wiki/Point-to-Point_Protocol" title="Point-to-Point Protocol">PPP</a><b> ·</b> <a href="/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol">SLIP</a><b> ·</b> <a href="/wiki/Ethernet" title="Ethernet">Ethernet</a><b> ·</b> <a href="/wiki/Token_ring" title="Token ring">Token ring</a><b> ·</b> <a href="/wiki/Token_bus" title="Token bus">Token bus</a><b> ·</b> <a href="/wiki/Wi-Fi" title="Wi-Fi">WiFi</a><b> ·</b> <a href="/wiki/Powerline" title="Powerline">Powerline</a><b> ·</b> <a href="/wiki/Asynchronous_Transfer_Mode" title="Asynchronous Transfer Mode">ATM</a><b> ·</b> <a href="/wiki/IEEE_802.1aq" title="IEEE 802.1aq">SPB</a><b> ·</b> <a href="/wiki/Multiprotocol_Label_Switching" title="Multiprotocol Label Switching">MPLS</a><b> ·</b> <a href="/wiki/Fiber_distributed_data_interface" title="Fiber distributed data interface">FDDI</a><b> ·</b> <a href="/wiki/High-Speed_Downlink_Packet_Access" title="High-Speed Downlink Packet Access">HSDPA</a><b> ·</b> <a href="/wiki/WiMAX" title="WiMAX">WiMAX</a><b> ·</b> <a href="/wiki/Categoria:Protocolli_livello_collegamento" title="Categoria:Protocolli livello collegamento"><i>altro..</i></a></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r140554510">.mw-parser-output .CdA{border:1px solid #aaa;width:100%;margin:auto;font-size:90%;padding:2px}.mw-parser-output .CdA th{background-color:#f2f2f2;font-weight:bold;width:20%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .CdA{border-color:#54595D}html.skin-theme-clientpref-night .mw-parser-output .CdA th{background-color:#202122}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output 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