CINXE.COM

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html lang="en"> <head> <script async src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"></script> <script> window.googletag = window.googletag || {cmd: []}; googletag.cmd.push(function() { googletag.defineSlot('/4906012/minicircuits_amplifiers_lb', [728, 90], 'div-gpt-ad-1511681685810-0').addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.enableServices(); }); </script><title>waveguide question, splitting and combining - Microwaves 101 Discussion Board</title> <link rel="canonical" href="https://forum.microwaves101.com/discussion/232/waveguide-question-splitting-and-combining" /> <link rel="stylesheet" type="text/css" href="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/cache/Minify/614f16bb2ec6cbfc64e72b796ce2778d.css?v=2J" media="screen" /> <link rel="stylesheet" type="text/css" href="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/cache/Minify/6bc3c83a65a8d04a7e6b2c9e007515a6.css?v=2J" media="screen" /> <link rel="stylesheet" type="text/css" href="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/cache/Minify/e222b311de0c6440386365b88fd58ded.css?v=2J" media="screen" /> <link rel="stylesheet" type="text/css" href="/applications/dashboard/design/browserstyles.css?v=2.0.2015.104810G" /> <link rel="stylesheet" type="text/css" href="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/uploads/flat.0ovgzhdt.css?v=KN9KDUIMXS2J" /> <link rel="stylesheet" type="text/css" href="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/applications/dashboard/design/final.css?v=2.0.2015.104810G" /> <link rel="stylesheet" type="text/css" href="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/applications/dashboard/design/print.css?v=2.0.2015.104810G" media="print" /> <link rel="shortcut icon" href="https://forum.microwaves101.com/uploads/favicon.ico" type="image/x-icon" /> <meta property="og:type" content="article" /> <meta property="og:site_name" content="Microwaves 101 Discussion Board" /> <meta property="og:title" content="waveguide question, splitting and combining" /> <meta property="og:url" content="https://forum.microwaves101.com/discussion/232/waveguide-question-splitting-and-combining" /> <meta name="description" property="og:description" content="Hi all, I have a WRD180 double-ridge source, 18-40 GHz. But I&#039;m using WR42 and WR28 of historical reasons for passing the signal on. There are adapters from WRD180 to WR28/WR42, but is it a more clever way of doing this, making a duplexer? WRD180 magic tee and two adapters to WR42/WR28 ? BR Lars" /> <script src="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/cache/Minify/2056fb24e46c45ba282d1122c3e5f043.js?v=SE" type="text/javascript"></script> <script src="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/cache/Minify/e3420cb377e58f1bada52aeada61c1f7.js?v=E" type="text/javascript"></script> <script src="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/cache/Minify/cbf5f61108ab733c24e3258e12ee4a5a.js?v=E" type="text/javascript"></script> <script src="https://platform.twitter.com/widgets.js" type="text/javascript"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS_HTML,Safe" type="text/javascript"></script> <script charset="utf-8" id="gotopage-ptl" type="text/template"> <div class="JumpToPage Hidden"> <form name="JumpToPage" method="get" action="{url}"> Page: <input type="text" autofocus name="Page" value="" autocomplete="off" /> </form> </div> </script> <style type="text/css"> div.Message, div.Excerpt {line-height:19px !important;} </style> <style type="text/css"> div.ac_results.related, div.ac_results.searchbar { top: 52px !important; } </style> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-24139105-2', 'auto'); ga('send', 'pageview', { 'dimension1': 'Guest' }); </script> <div id='div-gpt-ad-1511681685810-0' style='min-width: 728px; min-height: 90px; margin-top: 70px; margin-bottom: -50px;'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-ad-1511681685810-0'); }); </script> </div></head> <body id="vanilla_discussion_index" class="Vanilla Discussion Index "> <div id="Matte"></div> <div id="Frame" class="Flat"> <div id="Head" class="MainNav"><div id="HeadMatte"></div> <div class="Banner Menu"> <h1><a class="Title" href="https://www.microwaves101.com"><span><img width="163" height="32" style="padding-top:10px;padding-bottom:10px;height:32px;" class="BannerLogo" src="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/uploads/LQC11ZFYDP1W.png" alt="Microwaves 101 Discussion Board" /></span></a></h1><ul id="Menu"><li><a class="ActiveApp" href="/discussions">Forum</a></li><li><a href="/members">Members</a></li><li><a class="ApplyButton" href="/entry/register?Target=discussion%2F232%2Fwaveguide-question-splitting-and-combining">Sign Up</a></li><li><a class="SignInPopup" href="/entry/signin?Target=discussion%2F232%2Fwaveguide-question-splitting-and-combining">Sign In</a></li><li class="mp"><a class="mp"></a></li></ul> <div id="Search"><form method="get" action="/search" style="width:auto"> <div> <input type="submit" id="Form_Go" value="  " style="float:right;margin-left: 9px;" class="Button" /> <input type="text" id="Form_Search" name="Search" value="" autocapitalize="none" spellcheck="false" autocorrect="off" autocomplete="off" style="float:right" class="InputBox" /></div> </form></div> </div> </div> <div id="Body"> <div id="Content"><div class="Tabs HeadingTabs DiscussionTabs FirstPage"> <div class="SubTab"><span class="DiscussionTitle"><h2><a href="/discussion/232/waveguide-question-splitting-and-combining">waveguide question, splitting and combining</a></h2></span> <div class="ClearFix"></div> </div> </div> <ul class="DataList MessageList Discussion FirstPage"> <li class="Item Comment FirstComment nc" id="Discussion_232"> <div class="Comment"> <span class="Author"> <a title="SM4RZW" href="/profile/5/sm4rzw" class="ProfileLink"><img src="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/uploads/userpics/484/n46LAX2PWCN4Y.png" class="ProfilePhotoMedium" /></a><a href="/profile/5/sm4rzw">SM4RZW</a> </span> <div class="CommentInfo"> <span style="cursor:default;" title="Likes Earned">0</span> </div> <div class="Message"> Hi all,<br /> I have a WRD180 double-ridge source, 18-40 GHz.<br /> But I'm using WR42 and WR28 of historical reasons for passing the signal on.<br /> There are adapters from WRD180 to WR28/WR42, but is it a more clever way of doing this, making a duplexer? WRD180 magic tee and two adapters to WR42/WR28 ?<br /> BR Lars </div> <div class="Meta"> <span class="Author"> <a href="/profile/5/sm4rzw">SM4RZW</a> </span> <span class="DateCreated"> <a href="/discussion/232/waveguide-question-splitting-and-combining/p1" class="Permalink" id="Message_1" rel="nofollow"><time title="2025-01-14T11:41:51+00:00" datetime="2025-01-14T11:41:51+00:00" class="newtime"></time></a> </span> <span class="EditComment edit-more"><a title="Options" href="" class="show-more-opts" style="color:#888">Options</a></span><span class="pfmm EditComment edit-share"><a title="Share" href="" class="share-link" style="color:#888">Share</a></span><span class="Like"><span class="likes">0</span><span title="Likes" class="LikeThisLiked"><span class="like-spacer"></span></span></span> </div> </div> </li> <li class="Item Comment nc" id="Comment_535"> <div class="Comment"> <span class="Author"> <a title="Desert Sage" href="/profile/2842/desert-sage" class="ProfileLink"><img src="//1mkvvvtqkb5hve14sg-cdn.plushcontent.com/uploads/userpics/972/nX4BTZO9ZGVYH.png" class="ProfilePhotoMedium" /></a><a href="/profile/2842/desert-sage">Desert Sage</a> </span> <div class="CommentInfo"> <span style="cursor:default;" title="Likes Earned">0</span> </div> <div class="Message"> I found these. <a href="https://www.atmmicrowave.com/waveguide/adapter/waveguide-to-waveguide-transition/" target="_blank" rel="nofollow">https://www.atmmicrowave.com/waveguide/adapter/waveguide-to-waveguide-transition/</a><br /> VSWR is 1.2:1 max. I suppose you could go WRD to coax and coax back to WR28 or WR42 as an inelegant solution </div> <div class="Meta"> <span class="Author"> <a href="/profile/2842/desert-sage">Desert Sage</a> </span> <span class="DateCreated"> <a href="/discussion/comment/535" class="Permalink" id="Message_2" rel="nofollow"><time title="2025-02-17T18:40:10+00:00" datetime="2025-02-17T18:40:10+00:00" class="newtime"></time></a> </span> <span class="EditComment edit-more"><a title="Options" href="" class="show-more-opts" style="color:#888">Options</a></span><span class="pfmm EditComment edit-share"><a title="Share" href="" class="share-link" style="color:#888">Share</a></span><span class="Like"><span class="likes">0</span><span title="Likes" class="LikeThisLiked"><span class="like-spacer"></span></span></span> </div> </div> </li> </ul> <div class="BaseTab PageOne"></div><script> $("a.show-more-opts").live("click", function(e) { e.preventDefault(); $(this).parent().parent().find(".pfmm").removeClass("pfmm"); $(this).parent().remove(); }); </script><div class="MessageForm CommentForm NotLoggedIn"> <div class="Tabs CommentTabs"> <ul> <li class="Active"><a href="/discussion/232/waveguide-question-splitting-and-combining#" class="WriteButton TabLink">Write Comment</a></li> </ul> </div> <form id="Form_Comment" method="post" action="/vanilla/post/comment"> <div> <input type="hidden" id="Form_TransientKey" name="Comment/TransientKey" value="TSLLCONLC5C5" /><input type="hidden" id="Form_hpt" name="Comment/hpt" value="" style="display: none;" /><input type="hidden" id="Form_DiscussionID" name="Comment/DiscussionID" value="232" /><input type="hidden" id="Form_CommentID" name="Comment/CommentID" value="" /><input type="hidden" id="Form_DraftID" name="Comment/DraftID" value="" /><div class="ButtonBar"> <div class="ButtonBarBold"><span>bold</span></div> <div class="ButtonBarItalic"><span>italic</span></div> <div class="ButtonBarUnderline"><span>underline</span></div> <div class="ButtonBarStrike"><span>strike</span></div> <div class="ButtonBarCode"><span>code</span></div> <div class="ButtonBarQuote"><span>quote</span></div> <div class="ButtonBarUlist"><span>ulist</span></div> <div class="ButtonBarImage"><span>image</span></div> <div class="ButtonBarUrl"><span>url</span></div> <div class="ButtonBarMention"><span>mention</span></div> <div class="ButtonBarReveal"><span>reveal</span></div> <div class="ButtonBarYoutube"><span>youtube</span></div> <div class="ButtonBarTweet"><span>tweet</span></div> <div class="ButtonBarAttach" style="display:none;"><span>attach</span></div> <div class="ButtonBarDraft" style="display:none;"><span>draft</span></div> </div><div class="TextBoxWrapper"><textarea id="Form_Body" name="Comment/Body" readonly="true" rows="6" cols="100" class="TextBox">Sign in or register to add a comment.</textarea></div><div class="Buttons"> <a href="/entry/signin?Target=discussion%2F232%2Fwaveguide-question-splitting-and-combining" class="TabLink SignInPopup">Add a Comment</a><script type="text/javascript">if (!$('#Form_PostComment').hasClass('FakeButton')) $('#Form_PostComment').attr('title', 'Post, ctrl+enter');$('#Form_Body').keypress(function(event){ if((event.ctrlKey) && ((event.keyCode == 0xA)||(event.keyCode == 0xD))) $('#Form_PostComment').click(); })</script></div> </div> </form></div> </div> <div id="Panel"><div class="Box GuestBox"> <h4>Welcome!</h4> <p><style type="text/css">div.GuestBox .RiceBall span {display:none;} div.GuestBox .RiceBall {display:inline-block;vertical-align: top;} div.GuestBox p a {color: #f28238 !important;}div.GuestBox p a:hover{text-decoration:underline;}</style>Join the international conversation on a broad range of microwave and RF topics. Learn about the latest developments in our industry, post questions for your peers to answer, and weigh in with some answers if you can!</p> <div class="P"><a href="/entry/signin?Target=discussion%2F232%2Fwaveguide-question-splitting-and-combining" class="Button SignInPopup">Sign In</a> <a href="/entry/register?Target=discussion%2F232%2Fwaveguide-question-splitting-and-combining" class="Button ApplyButton">Create Account</a></div> </div> <div class="PanelBar"> <ul> <li><a href="/discussions">All Discussions</a></li><li><a href="/categories/all">Categories</a></li><li><a href="/events">Events</a></li><li><a href="/discussions/popular">Most Viewed</a></li><li><a href="/trending">Trending</a></li> </ul> </div> <div class="box-wrapper"> <div class="Box BoxCategories LoggedOut"> <h4>Categories</h4> <ul class="PanelInfo PanelCategories"> <li class="Depth1"><strong><a href="/categories/8/about-our-site">About Our Site</a></strong></li> <li class="Depth1"><strong><a href="/categories/1/antennas">Antennas</a></strong></li> <li class="Depth1"><strong><a href="/categories/2/applications">Applications</a></strong></li> <li class="Depth1"><strong><a href="/categories/3/biological-effects-and-applications">Biological Effects and Applications</a></strong></li> <li class="Depth1"><strong><a href="/categories/4/calculators">Calculators</a></strong></li> <li class="Depth1"><strong><a href="/categories/5/communications">Communications</a></strong></li> <li class="Depth1"><strong><a href="/categories/6/computer-aided-design">Computer Aided Design</a></strong></li> <li class="Depth1"><strong><a href="/categories/7/eda-software">EDA Software</a></strong></li> <li class="Depth1"><strong><a href="/categories/9/emerging-applications-and-technology">Emerging Applications and Technology</a></strong></li> <li class="Depth1"><strong><a href="/categories/10/employment">Employment</a></strong></li> <li class="Depth1"><strong><a href="/categories/11/field-theory">Field Theory</a></strong></li> <li class="Depth1 Active"><strong><a href="/categories/12/filters-and-passives">Filters and Passives</a></strong></li> <li class="Depth1"><strong><a href="/categories/13/general-questions">General Questions</a></strong></li> <li class="Depth1"><strong><a href="/categories/14/high-power">High Power</a></strong></li> <li class="Depth1"><strong><a href="/categories/15/history">History</a></strong></li> <li class="Depth1"><strong><a href="/categories/16/mmic-and-rfic">MMIC and RFIC</a></strong></li> <li class="Depth1"><strong><a href="/categories/17/packaging-and-materials">Packaging and Materials</a></strong></li> <li class="Depth1"><strong><a href="/categories/18/radar">Radar</a></strong></li> <li class="Depth1"><strong><a href="/categories/19/sources-and-receivers">Sources and Receivers</a></strong></li> <li class="Depth1"><strong><a href="/categories/20/test-and-measurement">Test and Measurement</a></strong></li> </ul> </div> </div> <div id="LatestPostList" class="Box"><h4>More Discussions</h4><ul class="PanelInfo"><li><a href="/discussion/54/working-out-the-dimensions-of-an-end-launch-waveguide-to-coax-transition" class="PostTitle">Working out the dimensions of an 'end launch' waveguide to coax transition</a><div class="Condensed" style="padding-top:1px;"><span class="PostDate"><time title="2018-09-29T05:49:41+00:00" datetime="2018-09-29T05:49:41+00:00" class="newtime"></time></span></div></li><li><a href="/discussion/147/heating-problem-waveguide-wr-1800-to-coaxial-adapter" class="PostTitle">Heating problem Waveguide WR 1800 to Coaxial Adapter</a><div class="Condensed" style="padding-top:1px;"><span class="PostDate"><time title="2020-10-31T17:56:29+00:00" datetime="2020-10-31T17:56:29+00:00" class="newtime"></time></span></div></li><li><a href="/discussion/27/coplanar-waveguide-marchand-balun" class="PostTitle">Coplanar Waveguide Marchand Balun</a><div class="Condensed" style="padding-top:1px;"><span class="PostDate"><time title="2018-07-21T03:11:21+00:00" datetime="2018-07-21T03:11:21+00:00" class="newtime"></time></span></div></li><li><a href="/discussion/50/connector-for-waveguide-transition" class="PostTitle">Connector for waveguide transition</a><div class="Condensed" style="padding-top:1px;"><span class="PostDate"><time title="2018-08-26T16:46:49+00:00" datetime="2018-08-26T16:46:49+00:00" class="newtime"></time></span></div></li></ul></div> <div class="Box BoxAdmin"><ul><li><a href="/page/terms-of-service">Terms of Service</a></li><li><a href="/page/useful-hints-and-tips">Useful Hints and Tips</a></li><li><a class="SignInPopup" href="/entry/signin?Target=discussion%2F232%2Fwaveguide-question-splitting-and-combining">Sign In</a></li><li style="display:none" class="cw-pf"><a href="https://plushforums.com" target="_blank">Created with PlushForums</a></li><li><span>© 2025 Microwaves 101 Discussion Board</span></li></ul></div></div> </div> <script type="text/javascript">$(document).bind("keydown", "alt+a", toggleTools);$('.jslink').click(function(e){e.preventDefault();toggleTools();});</script> <div id="Foot"> <div><a class="PoweredBy" href="https://plushforums.com"></a></div> <div id="Definitions" style="display: none;"> <input type="hidden" id="DiscussionID" value="232" /> <input type="hidden" id="Likes_AutoRefresh" value="30" /> <input type="hidden" id="InputFormat" value="BBCode" /> <input type="hidden" id="apcavailable" value="" /> <input type="hidden" id="uploaderuniq" value="67c4c96930f35" /> <input type="hidden" id="maxuploadsize" value="26214400" /> <input type="hidden" id="RiceBalls" value="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" /> <input type="hidden" id="PrivateCommunity" value="0" /> <input type="hidden" id="MiscData" value="YW6R4VCMAFVPZOVRCUZ1TFE2L8GJMFFMRVX9LTPQUUGGQPGMUTP1EAAJOZPFBCO4YOE6ULADJO3O3RMWGRBZTUSOHVOQ95LUZXBTRNVDGINXBADOXLVCG7DLU120OOQ9QNJ6I2PLJC25D295GR79OPDMJEKSYXR47DKAFULZV1GD1H32930ZHV1B4KKXL0CZB70NZM3FAWD0H9IEBEQTOYXNAGB0FUQYYEAIC8HCDRZYLNTEX70" /> <input type="hidden" id="UserID" value="guest" /> <input type="hidden" id="LastCommentID" value="535" /> <input type="hidden" id="Vanilla_Comments_AutoRefresh" value="30" /> <input type="hidden" id="TransientKey" value="GXW1AGCAR9LD" /> <input type="hidden" id="WebRoot" value="/" /> <input type="hidden" id="UrlFormat" value="/{Path}" /> <input type="hidden" id="Path" value="discussion/232/waveguide-question-splitting-and-combining" /> <input type="hidden" id="SignedIn" value="0" /> <input type="hidden" id="ConfirmHeading" value="Confirm" /> <input type="hidden" id="ConfirmText" value="Are you sure you want to do that?" /> <input type="hidden" id="Okay" value="OK" /> <input type="hidden" id="Cancel" value="Cancel" /> <input type="hidden" id="Search" value="Search" /> </div> </div> </div> </body> </html>