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waveguide</title> <meta name="description" content="Search results for: waveguide"> <meta name="keywords" content="waveguide"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler ml-auto" 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="waveguide"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 83</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: waveguide</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">83</span> Control of Oxide and Silicon Loss during Exposure of Silicon Waveguide</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Gu%20Zhonghua">Gu Zhonghua</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Control method of bulk silicon dioxide etching process to approach then expose silicon waveguide has been developed. It has been demonstrated by silicon waveguide of photonics devices. It is also able to generalize other applications. Use plasma dry etching to etch bulk silicon dioxide and approach oxide-silicon interface accurately, then use dilute HF wet etching to etch silicon dioxide residue layer to expose the silicon waveguide as soft landing. Plasma dry etch macro loading effect and endpoint technology was used to determine dry etch time accurately with a low wafer expose ratio. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=waveguide" title="waveguide">waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=etch" title=" etch"> etch</a>, <a href="https://publications.waset.org/abstracts/search?q=control" title=" control"> control</a>, <a href="https://publications.waset.org/abstracts/search?q=silicon%20loss" title=" silicon loss"> silicon loss</a> </p> <a href="https://publications.waset.org/abstracts/34993/control-of-oxide-and-silicon-loss-during-exposure-of-silicon-waveguide" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34993.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">414</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">82</span> Compact Low Loss Design of SOI 1x2 Y-Branch Optical Power Splitter with S-Bend Waveguide and Study on the Variation of Transmitted Power with Various Waveguide Parameters</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nagaraju%20Pendam">Nagaraju Pendam</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20P.%20Vardhani"> C. P. Vardhani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A simple technology–compatible design of silicon-on-insulator based 1×2 optical power splitter is proposed. For developing large area Opto-electronic Silicon-on-Insulator (SOI) devices, the power splitter is a key passive device. The SOI rib- waveguide dimensions (height, width, and etching depth, refractive indices, length of waveguide) leading simultaneously to single mode propagation. In this paper a low loss optical power splitter is designed by using R Soft cad tool and simulated by Beam propagation method, here s-bend waveguides proposed. We concentrate changing the refractive index difference, branching angle, width of the waveguide, free space wavelength of the waveguide and observing transmitted power, effective refractive index in the designed waveguide, and choosing the best simulated results to be fabricated on silicon-on insulator platform. In this design 1550 nm free spacing are used. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=beam%20propagation%20method" title="beam propagation method">beam propagation method</a>, <a href="https://publications.waset.org/abstracts/search?q=insertion%20loss" title=" insertion loss"> insertion loss</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20power%20splitter" title=" optical power splitter"> optical power splitter</a>, <a href="https://publications.waset.org/abstracts/search?q=rib%20waveguide" title=" rib waveguide"> rib waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=transmitted%20power" title=" transmitted power"> transmitted power</a> </p> <a href="https://publications.waset.org/abstracts/16984/compact-low-loss-design-of-soi-1x2-y-branch-optical-power-splitter-with-s-bend-waveguide-and-study-on-the-variation-of-transmitted-power-with-various-waveguide-parameters" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/16984.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">663</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">81</span> Theory of Gyrotron Amplifier in a Vane-Loaded Waveguide with Inner Dielectric Material</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Reyhaneh%20Hashemi">Reyhaneh Hashemi</a>, <a href="https://publications.waset.org/abstracts/search?q=Shahrooz%20Saviz"> Shahrooz Saviz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In his study, we have survey the theory of gyrotron amplifier in a vane-loaded waveguide with inner dielectric material. Dispersion relation for electromagnetic waves emitted by a cylindrical waveguide that provided with wedge-shaped metal vanes projecting radially inward from the wall of the guide and exited in the transverse-electric mode was analysed. From numerical analysis of this dispersion relation, it is shown that the stability behavior of the fast-wave mode is dependent of the dielectric constant. With a small axial momentum spreed, a super bandwidth is shown to be attainable by a mixed mode operation. Also, with the utilization from the numeric analysis of relation dispersion. We show that in the –speed mode, the constant is independent de-electric. With the ratio of dispersion of smell, high –bandwith was obtained for the combined mode. And at the end, we were comparing the result of our work (vane-loaded) by the waveguide with a smooth wall. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=gyrotron%20amplifier" title="gyrotron amplifier">gyrotron amplifier</a>, <a href="https://publications.waset.org/abstracts/search?q=waveguide" title=" waveguide"> waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=vane-loaded%20waveguide" title=" vane-loaded waveguide"> vane-loaded waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=dielectric%20material" title=" dielectric material"> dielectric material</a>, <a href="https://publications.waset.org/abstracts/search?q=dispersion%20relation" title=" dispersion relation"> dispersion relation</a>, <a href="https://publications.waset.org/abstracts/search?q=cylindrical%20waveguide" title=" cylindrical waveguide"> cylindrical waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=fast-wave%20mode" title=" fast-wave mode"> fast-wave mode</a>, <a href="https://publications.waset.org/abstracts/search?q=mixed%20mode%20operation" title=" mixed mode operation"> mixed mode operation</a> </p> <a href="https://publications.waset.org/abstracts/151063/theory-of-gyrotron-amplifier-in-a-vane-loaded-waveguide-with-inner-dielectric-material" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/151063.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">102</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">80</span> Spectral Broadening in an InGaAsP Optical Waveguide with χ(3) Nonlinearity Including Two Photon Absorption</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Keigo%20Matsuura">Keigo Matsuura</a>, <a href="https://publications.waset.org/abstracts/search?q=Isao%20Tomita"> Isao Tomita</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We have studied a method to widen the spectrum of optical pulses that pass through an InGaAsP waveguide for application to broadband optical communication. In particular, we have investigated the competitive effect between spectral broadening arising from nonlinear refraction (optical Kerr effect) and shrinking due to two photon absorption in the InGaAsP waveguide with chi^(3) nonlinearity. The shrunk spectrum recovers broadening by the enhancement effect of the nonlinear refractive index near the bandgap of InGaAsP with a bandgap wavelength of 1490 nm. The broadened spectral width at around 1525 nm (196.7 THz) becomes 10.7 times wider than that at around 1560 nm (192.3 THz) without the enhancement effect, where amplified optical pulses with a pulse width of 2 ps and a peak power of 10 W propagate through a 1-cm-long InGaAsP waveguide with a cross-section of 4 um^2. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=InGaAsP%20waveguide" title="InGaAsP waveguide">InGaAsP waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=Chi%5E%283%29%20nonlinearity" title=" Chi^(3) nonlinearity"> Chi^(3) nonlinearity</a>, <a href="https://publications.waset.org/abstracts/search?q=spectral%20broadening" title=" spectral broadening"> spectral broadening</a>, <a href="https://publications.waset.org/abstracts/search?q=photon%20absorption" title=" photon absorption "> photon absorption </a> </p> <a href="https://publications.waset.org/abstracts/13656/spectral-broadening-in-an-ingaasp-optical-waveguide-with-kh3-nonlinearity-including-two-photon-absorption" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13656.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">634</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">79</span> Planar Plasmonic Terahertz Waveguides for Sensor Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Maidul%20Islam">Maidul Islam</a>, <a href="https://publications.waset.org/abstracts/search?q=Dibakar%20Roy%20Chowdhury"> Dibakar Roy Chowdhury</a>, <a href="https://publications.waset.org/abstracts/search?q=Gagan%20Kumar"> Gagan Kumar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate sensing capabilities of a planar plasmonic THz waveguide. The waveguide is comprised of one dimensional array of periodically arranged sub wavelength scale corrugations in the form of rectangular dimples in order to ensure the plasmonic response. The THz waveguide transmission is observed for polyimide (as thin film) substance filling the dimples. The refractive index of the polyimide film is varied to examine various sensing parameters such as frequency shift, sensitivity and Figure of Merit (FoM) of the fundamental plasmonic resonance supported by the waveguide. In efforts to improve sensing characteristics, we also examine sensing capabilities of a plasmonic waveguide having V shaped corrugations and compare results with that of rectangular dimples. The proposed study could be significant in developing new terahertz sensors with improved sensitivity utilizing the plasmonic waveguides. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=plasmonics" title="plasmonics">plasmonics</a>, <a href="https://publications.waset.org/abstracts/search?q=sensors" title=" sensors"> sensors</a>, <a href="https://publications.waset.org/abstracts/search?q=sub-wavelength%20structures" title=" sub-wavelength structures"> sub-wavelength structures</a>, <a href="https://publications.waset.org/abstracts/search?q=terahertz" title=" terahertz"> terahertz</a> </p> <a href="https://publications.waset.org/abstracts/78757/planar-plasmonic-terahertz-waveguides-for-sensor-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/78757.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">226</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">78</span> Application of MoM-GEC Method for Electromagnetic Study of Planar Microwave Structures: Shielding Application</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Nouainia">Ahmed Nouainia</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Hajji"> Mohamed Hajji</a>, <a href="https://publications.waset.org/abstracts/search?q=Taoufik%20Aguili"> Taoufik Aguili</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, an electromagnetic analysis is presented for describing the influence of shielding in a rectangular waveguide. A hybridization based on the method of moments combined to the generalized equivalent circuit MoM-GEC is used to model the problem. This is validated by applying the MoM-GEC hybridization to investigate a diffraction structure. It consists of electromagnetic diffraction by an iris in a rectangular waveguide. Numerical results are shown and discussed and a comparison with FEM and Marcuvitz methods is achieved. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=method%20MoM-GEC" title="method MoM-GEC">method MoM-GEC</a>, <a href="https://publications.waset.org/abstracts/search?q=waveguide" title=" waveguide"> waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=shielding" title=" shielding"> shielding</a>, <a href="https://publications.waset.org/abstracts/search?q=equivalent%20circuit" title=" equivalent circuit"> equivalent circuit</a> </p> <a href="https://publications.waset.org/abstracts/62267/application-of-mom-gec-method-for-electromagnetic-study-of-planar-microwave-structures-shielding-application" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62267.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">373</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">77</span> Plate-Laminated Slotted-Waveguide Fed 2×3 Planar Inverted F Antenna Array</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Badar%20Muneer">Badar Muneer</a>, <a href="https://publications.waset.org/abstracts/search?q=Waseem%20Shabir"> Waseem Shabir</a>, <a href="https://publications.waset.org/abstracts/search?q=Faisal%20Karim%20Shaikh"> Faisal Karim Shaikh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Substrate Integrated waveguide based 6-element array of Planar Inverted F antenna (PIFA) has been presented and analyzed parametrically in this paper. The antenna is fed with coupled transverse slots on a plate laminated waveguide cavity to ensure wide bandwidth and simplicity of feeding network. The two-layer structure has one layer dedicated for feeding network and the top layer dedicated for radiating elements. It has been demonstrated that the presented feeding technique for feeding such class of array antennas can be far simple in structure and miniaturized in size when it comes to designing large phased array antenna systems. A good return loss and standing wave ratio of 2:1 has been achieved while maintaining properties of typical PIFA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=feeding%20network" title="feeding network">feeding network</a>, <a href="https://publications.waset.org/abstracts/search?q=laminated%20waveguide" title=" laminated waveguide"> laminated waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=PIFA" title=" PIFA"> PIFA</a>, <a href="https://publications.waset.org/abstracts/search?q=transverse%20slots" title=" transverse slots"> transverse slots</a> </p> <a href="https://publications.waset.org/abstracts/63475/plate-laminated-slotted-waveguide-fed-23-planar-inverted-f-antenna-array" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63475.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">311</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">76</span> Semiconductor Device of Tapered Waveguide for Broadband Optical Communications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Keita%20Iwai">Keita Iwai</a>, <a href="https://publications.waset.org/abstracts/search?q=Isao%20Tomita"> Isao Tomita</a> </p> <p class="card-text"><strong>Abstract:</strong></p> To expand the optical spectrum for use in broadband optical communications, we study the properties of a semiconductor waveguide device with a tapered structure including its third-order optical nonlinearity. Spectral-broadened output by the tapered structure has the potential to create a compact, built-in device for optical communications. Here we deal with a compound semiconductor waveguide, the material of which is the same as that of laser diodes used in the communication systems, i.e., InₓGa₁₋ₓAsᵧP₁₋ᵧ, which has large optical nonlinearity. We confirm that our structure widens the output spectrum sufficiently by controlling its taper form factor while utilizing the large nonlinear refraction of InₓGa₁₋ₓAsᵧP₁₋ᵧ. We also examine the taper effect for nonlinear optical loss. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=In%E2%82%93Ga%E2%82%81%E2%82%8B%E2%82%93As%E1%B5%A7P%E2%82%81%E2%82%8B%E1%B5%A7" title="InₓGa₁₋ₓAsᵧP₁₋ᵧ">InₓGa₁₋ₓAsᵧP₁₋ᵧ</a>, <a href="https://publications.waset.org/abstracts/search?q=waveguide" title=" waveguide"> waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=nonlinear%20refraction" title=" nonlinear refraction"> nonlinear refraction</a>, <a href="https://publications.waset.org/abstracts/search?q=spectral%20spreading" title=" spectral spreading"> spectral spreading</a>, <a href="https://publications.waset.org/abstracts/search?q=taper%20device" title=" taper device"> taper device</a> </p> <a href="https://publications.waset.org/abstracts/143322/semiconductor-device-of-tapered-waveguide-for-broadband-optical-communications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/143322.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">151</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">75</span> On Transferring of Transient Signals along Hollow Waveguide</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20Eroglu">E. Eroglu</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Semsit"> S. Semsit</a>, <a href="https://publications.waset.org/abstracts/search?q=E.%20Sener"> E. Sener</a>, <a href="https://publications.waset.org/abstracts/search?q=U.S.%20Sener"> U.S. Sener</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In Electromagnetics, there are three canonical boundary value problem with given initial conditions for the electromagnetic field sought, namely: Cavity Problem, Waveguide Problem, and External Problem. The Cavity Problem and Waveguide Problem were rigorously studied and new results were arised at original works in the past decades. In based on studies of an analytical time domain method Evolutionary Approach to Electromagnetics (EAE), electromagnetic field strength vectors produced by a time dependent source function are sought. The fields are took place in L2 Hilbert space. The source function that performs signal transferring, energy and surplus of energy has been demonstrated with all clarity. Depth of the method and ease of applications are emerged needs of gathering obtained results. Main discussion is about perfect electric conductor and hollow waveguide. Even if well studied time-domain modes problems are mentioned, specifically, the modes which have a hollow (i.e., medium-free) cross-section domain are considered. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=evolutionary%20approach%20to%20electromagnetics" title="evolutionary approach to electromagnetics">evolutionary approach to electromagnetics</a>, <a href="https://publications.waset.org/abstracts/search?q=time-domain%20waveguide%20mode" title=" time-domain waveguide mode"> time-domain waveguide mode</a>, <a href="https://publications.waset.org/abstracts/search?q=Neumann%20problem" title=" Neumann problem"> Neumann problem</a>, <a href="https://publications.waset.org/abstracts/search?q=Dirichlet%20boundary%20value%20problem" title=" Dirichlet boundary value problem"> Dirichlet boundary value problem</a>, <a href="https://publications.waset.org/abstracts/search?q=Klein-Gordon" title=" Klein-Gordon"> Klein-Gordon</a> </p> <a href="https://publications.waset.org/abstracts/42378/on-transferring-of-transient-signals-along-hollow-waveguide" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42378.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">329</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">74</span> Study of Waveguide Silica Glasses by Raman Spectroscopy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Abdelmounim%20Bakkali">Mohamed Abdelmounim Bakkali</a>, <a href="https://publications.waset.org/abstracts/search?q=Mustapha%20El%20Mataouy"> Mustapha El Mataouy</a>, <a href="https://publications.waset.org/abstracts/search?q=Abellatif%20Aaliti"> Abellatif Aaliti</a>, <a href="https://publications.waset.org/abstracts/search?q=Mouhamed%20Khaddor"> Mouhamed Khaddor</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the paper, we study the effects of introducing hafnium oxide on Raman spectra of silica glass planar waveguide activated by 0.3 mol% Er3+ ions. This work compares Raman spectra measured for three thin films deposited on silicon substrate. The films were prepared with different molar ratio of Si/Hf using sol-gel method and deposited by dip coating technique. The effect of hafnium oxide incorporation on the waveguides shows the evolution of the structure of this material. This structural information is useful to understand the luminescence intensity by means of ion–ion interaction mechanisms. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=optical%20amplifiers" title="optical amplifiers">optical amplifiers</a>, <a href="https://publications.waset.org/abstracts/search?q=non-bridging%20oxygen" title=" non-bridging oxygen"> non-bridging oxygen</a>, <a href="https://publications.waset.org/abstracts/search?q=erbium" title=" erbium"> erbium</a>, <a href="https://publications.waset.org/abstracts/search?q=sol-gel" title=" sol-gel"> sol-gel</a>, <a href="https://publications.waset.org/abstracts/search?q=waveguide" title=" waveguide"> waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=silica-hafnia" title=" silica-hafnia"> silica-hafnia</a> </p> <a href="https://publications.waset.org/abstracts/60116/study-of-waveguide-silica-glasses-by-raman-spectroscopy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/60116.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">306</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">73</span> Defect Modes in Multilayered Piezoelectric Structures</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.%20G.%20Piliposyan">D. G. Piliposyan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Propagation of electro-elastic waves in a piezoelectric waveguide with finite stacks and a defect layer is studied using a modified transfer matrix method. The dispersion equation for a periodic structure consisting of unit cells made up from two piezoelectric materials with metallized interfaces is obtained. An analytical expression, for the transmission coefficient for a waveguide with finite stacks and a defect layer, that is found can be used to accurately detect and control the position of the passband within a stopband. The result can be instrumental in constructing a tunable waveguide made of layers of different or identical piezoelectric crystals and separated by metallized interfaces. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=piezoelectric%20layered%20structure" title="piezoelectric layered structure">piezoelectric layered structure</a>, <a href="https://publications.waset.org/abstracts/search?q=periodic%20phononic%20crystal" title=" periodic phononic crystal"> periodic phononic crystal</a>, <a href="https://publications.waset.org/abstracts/search?q=bandgap" title=" bandgap"> bandgap</a>, <a href="https://publications.waset.org/abstracts/search?q=bloch%20waves" title=" bloch waves"> bloch waves</a> </p> <a href="https://publications.waset.org/abstracts/55400/defect-modes-in-multilayered-piezoelectric-structures" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/55400.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">224</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">72</span> Efficient Study of Substrate Integrated Waveguide Devices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=J.%20Hajri">J. Hajri</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Hrizi"> H. Hrizi</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Sboui"> N. Sboui</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Baudrand"> H. Baudrand</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a study of SIW circuits (Substrate Integrated Waveguide) with a rigorous and fast original approach based on Iterative process (WCIP). The theoretical suggested study is validated by the simulation of two different examples of SIW circuits. The obtained results are in good agreement with those of measurement and with software HFSS. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=convergence%20study" title="convergence study">convergence study</a>, <a href="https://publications.waset.org/abstracts/search?q=HFSS" title=" HFSS"> HFSS</a>, <a href="https://publications.waset.org/abstracts/search?q=modal%20decomposition" title=" modal decomposition"> modal decomposition</a>, <a href="https://publications.waset.org/abstracts/search?q=SIW%20circuits" title=" SIW circuits"> SIW circuits</a>, <a href="https://publications.waset.org/abstracts/search?q=WCIP%20method" title=" WCIP method"> WCIP method</a> </p> <a href="https://publications.waset.org/abstracts/22247/efficient-study-of-substrate-integrated-waveguide-devices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22247.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">498</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">71</span> Semiconductor Variable Wavelength Generator of Near-Infrared-to-Terahertz Regions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Isao%20Tomita">Isao Tomita</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Power characteristics are obtained for laser beams of near-infrared and terahertz wavelengths when produced by difference-frequency generation with a quasi-phase-matched (QPM) waveguide made of gallium phosphide (GaP). A refractive-index change of the QPM GaP waveguide is included in computations with Sellmeier’s formula for varying input wavelengths, where optical loss is also included. Although the output power decreases with decreasing photon energy as the beam wavelength changes from near-infrared to terahertz wavelengths, the beam generation with such greatly different wavelengths, which is not achievable with an ordinary laser diode without the replacement of semiconductor material with a different bandgap one, can be made with the same semiconductor (GaP) by changing the QPM period, where a way of changing the period is provided. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=difference-frequency%20generation" title="difference-frequency generation">difference-frequency generation</a>, <a href="https://publications.waset.org/abstracts/search?q=gallium%20phosphide" title=" gallium phosphide"> gallium phosphide</a>, <a href="https://publications.waset.org/abstracts/search?q=quasi-phase-matching" title=" quasi-phase-matching"> quasi-phase-matching</a>, <a href="https://publications.waset.org/abstracts/search?q=waveguide" title=" waveguide"> waveguide</a> </p> <a href="https://publications.waset.org/abstracts/145853/semiconductor-variable-wavelength-generator-of-near-infrared-to-terahertz-regions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/145853.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">116</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">70</span> CRLH and SRR Based Microwave Filter Design Useful for Communication Applications </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Subal%20Kar">Subal Kar</a>, <a href="https://publications.waset.org/abstracts/search?q=Amitesh%20Kumar"> Amitesh Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Majumder"> A. Majumder</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20K.%20Ghosh"> S. K. Ghosh</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Saha"> S. Saha</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20S.%20Sikdar"> S. S. Sikdar</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20K.%20Saha"> T. K. Saha</a> </p> <p class="card-text"><strong>Abstract:</strong></p> CRLH (composite right/left-handed) based and SRR (split-ring resonator) based filters have been designed at microwave frequency which can provide better performance compared to conventional edge-coupled band-pass filter designed around the same frequency, 2.45 GHz. Both CRLH and SRR are unit cells used in metamaterial design. The primary aim of designing filters with such structures is to realize size reduction and also to realize novel filter performance. The CRLH based filter has been designed in microstrip transmission line, while the SRR based filter is designed with SRR loading in waveguide. The CRLH based filter designed at 2.45 GHz provides an insertion loss of 1.6 dB with harmonic suppression up to 10 GHz with 67 % size reduction when compared with a conventional edge-coupled band-pass filter designed around the same frequency. One dimensional (1-D) SRR matrix loaded in a waveguide shows the possibility of realizing a stop-band with sharp skirts in the pass-band while a stop-band in the pass-band of normal rectangular waveguide with tailoring of the dimensions of SRR unit cells. Such filters are expected to be very useful for communication systems at microwave frequency. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=BPF" title="BPF">BPF</a>, <a href="https://publications.waset.org/abstracts/search?q=CRLH" title=" CRLH"> CRLH</a>, <a href="https://publications.waset.org/abstracts/search?q=harmonic" title=" harmonic"> harmonic</a>, <a href="https://publications.waset.org/abstracts/search?q=metamaterial" title=" metamaterial"> metamaterial</a>, <a href="https://publications.waset.org/abstracts/search?q=SRR%20and%20waveguide" title=" SRR and waveguide"> SRR and waveguide</a> </p> <a href="https://publications.waset.org/abstracts/40047/crlh-and-srr-based-microwave-filter-design-useful-for-communication-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40047.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">427</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">69</span> Electromagnetic Interference Shielding Effectiveness of a Corrugated Rectangular Waveguide for a Microwave Conveyor-Belt Drier </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sang-Hyeon%20Bae">Sang-Hyeon Bae</a>, <a href="https://publications.waset.org/abstracts/search?q=Sung-Yeon%20Kim"> Sung-Yeon Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Min-Gyo%20Jeong"> Min-Gyo Jeong</a>, <a href="https://publications.waset.org/abstracts/search?q=Ji-Hong%20Kim"> Ji-Hong Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Wang-Sang%20Lee"> Wang-Sang Lee</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Traditional heating methods such as electric ovens or steam heating are slow and not very efficient. For continuously heating the objects, a microwave conveyor-belt drier is widely used in the industrial microwave heating systems. However, there is a problem in which electromagnetic wave leaks toward outside of the heating cavity through the insertion opening. To achieve the prevention of the leakage of microwaves and improved heating characteristics, the corrugated rectangular waveguide at the entrance and exit openings of a microwave conveyor-belt drier is proposed and its electromagnetic interference (EMI) shielding effectiveness is analyzed and verified. The corrugated waveguides in the proposed microwave heating system achieve at least 20 dB shielding effectiveness while ensuring a sufficient height of the openings. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=corrugated" title="corrugated">corrugated</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20wave" title=" electromagnetic wave"> electromagnetic wave</a>, <a href="https://publications.waset.org/abstracts/search?q=microwave%20conveyor-belt%20drier" title=" microwave conveyor-belt drier"> microwave conveyor-belt drier</a>, <a href="https://publications.waset.org/abstracts/search?q=rectangular%20waveguide" title=" rectangular waveguide"> rectangular waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=shielding%20effectiveness" title=" shielding effectiveness"> shielding effectiveness</a> </p> <a href="https://publications.waset.org/abstracts/62070/electromagnetic-interference-shielding-effectiveness-of-a-corrugated-rectangular-waveguide-for-a-microwave-conveyor-belt-drier" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62070.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">516</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">68</span> Atmospheric Pressure Microwave Plasma System and Its Applications </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Waqas%20A.%20Toor">Waqas A. Toor</a>, <a href="https://publications.waset.org/abstracts/search?q=Anis%20U.%20Baig"> Anis U. Baig</a>, <a href="https://publications.waset.org/abstracts/search?q=Nuaman%20Shafqat"> Nuaman Shafqat</a>, <a href="https://publications.waset.org/abstracts/search?q=Raafia%20Irfan"> Raafia Irfan</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Ashraf"> Muhammad Ashraf</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A 2.45GHz microwave plasma system and its few applications have been developed. Argon and helium plasma is produced by metallic nozzle and also in a quartz tube at atmospheric pressure, using WR-340 waveguide and its tapered version. The waveguide applicator is also simulated in HFSS and field patterns are analyzed for maximum power absorption in the load. The system is tuned to operate at less than 10% reflected power. Various experimental techniques are used to initiate and sustain the plasma at atmospheric pressure. Plasma of atmospheric air is also produced without using any other shielding gas. The plasma flame is also characterized by its spectrum. Spectral analyses of plasma flame can be used for online analysis of combustion gases produced in industry. The applications of the system include glass and quartz processing, vitrification, emission spectroscopy, plasma coating. Low pressure plasma applications of the system include intense UV light for water purification and ozone generation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=HFSS%20high%20frequency%20structure%20simulator" title="HFSS high frequency structure simulator">HFSS high frequency structure simulator</a>, <a href="https://publications.waset.org/abstracts/search?q=Microwave%20plasma" title=" Microwave plasma"> Microwave plasma</a>, <a href="https://publications.waset.org/abstracts/search?q=UV%20ultraviolet" title=" UV ultraviolet"> UV ultraviolet</a>, <a href="https://publications.waset.org/abstracts/search?q=WR%20rectangular%20waveguide" title=" WR rectangular waveguide"> WR rectangular waveguide</a> </p> <a href="https://publications.waset.org/abstracts/91066/atmospheric-pressure-microwave-plasma-system-and-its-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/91066.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">271</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">67</span> Visualization of Energy Waves via Airy Functions in Time-Domain</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20Sener">E. Sener</a>, <a href="https://publications.waset.org/abstracts/search?q=O.%20Isik"> O. Isik</a>, <a href="https://publications.waset.org/abstracts/search?q=E.%20Eroglu"> E. Eroglu</a>, <a href="https://publications.waset.org/abstracts/search?q=U.%20Sahin"> U. Sahin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The main idea is to solve the system of Maxwell’s equations in accordance with the causality principle to get the energy quantities via Airy functions in a hollow rectangular waveguide. We used the evolutionary approach to electromagnetics that is an analytical time-domain method. The boundary-value problem for the system of Maxwell’s equations is reformulated in transverse and longitudinal coordinates. A self-adjoint operator is obtained and the complete set of Eigen vectors of the operator initiates an orthonormal basis of the solution space. Hence, the sought electromagnetic field can be presented in terms of this basis. Within the presentation, the scalar coefficients are governed by Klein-Gordon equation. Ultimately, in this study, time-domain waveguide problem is solved analytically in accordance with the causality principle. Moreover, the graphical results are visualized for the case when the energy and surplus of the energy for the time-domain waveguide modes are represented via airy functions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=airy%20functions" title="airy functions">airy functions</a>, <a href="https://publications.waset.org/abstracts/search?q=Klein-Gordon%20Equation" title=" Klein-Gordon Equation"> Klein-Gordon Equation</a>, <a href="https://publications.waset.org/abstracts/search?q=Maxwell%E2%80%99s%20equations" title=" Maxwell’s equations"> Maxwell’s equations</a>, <a href="https://publications.waset.org/abstracts/search?q=Surplus%20of%20energy" title=" Surplus of energy"> Surplus of energy</a>, <a href="https://publications.waset.org/abstracts/search?q=wave%20boundary%20operators" title=" wave boundary operators"> wave boundary operators</a> </p> <a href="https://publications.waset.org/abstracts/42403/visualization-of-energy-waves-via-airy-functions-in-time-domain" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42403.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">371</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">66</span> 3D-Printing of Waveguide Terminations: Effect of Material Shape and Structuring on Their Characteristics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Lana%20Damaj">Lana Damaj</a>, <a href="https://publications.waset.org/abstracts/search?q=Vincent%20Laur"> Vincent Laur</a>, <a href="https://publications.waset.org/abstracts/search?q=Azar%20Maalouf"> Azar Maalouf</a>, <a href="https://publications.waset.org/abstracts/search?q=Alexis%20Chevalier"> Alexis Chevalier</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Matched termination is an important part of the passive waveguide components. It is typically used at the end of a waveguide transmission line to prevent reflections and improve signal quality. Waveguide terminations (loads) are commonly used in microwave and RF applications. In traditional microwave architectures, usually, waveguide termination consists of a standard rectangular waveguide made by a lossy resistive material, and ended by shorting metallic plate. These types of terminations are used, to dissipate the energy as heat. However, these terminations may increase the size and the weight of the overall system. New alternative solution consists in developing terminations based on 3D-printing of materials. Designing such terminations is very challenging since it should meet the requirements imposed by the system. These requirements include many parameters such as the absorption, the power handling capability in addition to the cost, the size and the weight that have to be minimized. 3D-printing is a shaping process that enables the production of complex geometries. It allows to find best compromise between requirements. In this paper, a comparison study has been made between different existing and new shapes of waveguide terminations. Indeed, 3D printing of absorbers makes it possible to study not only standard shapes (wedge, pyramid, tongue) but also more complex topologies such as exponential ones. These shapes have been designed and simulated using CST MWS®. The loads have been printed using the carbon-filled PolyLactic Acid, conductive PLA from ProtoPasta. Since the terminations has been characterized in the X-band (from 8GHz to 12GHz), the rectangular waveguide standard WR-90 has been selected. The classical wedge shape has been used as a reference. First, all loads have been simulated with the same length and two parameters have been compared: the absorption level (level of |S11|) and the dissipated power density. This study shows that the concave exponential pyramidal shape has the better absorption level and the convex exponential pyramidal shape has the better dissipated power density level. These two loads have been printed in order to measure their properties. A good agreement between the simulated and measured reflection coefficient has been obtained. Furthermore, a study of material structuring based on the honeycomb hexagonal structure has been investigated in order to vary the effective properties. In the final paper, the detailed methodology and the simulated and measured results will be presented in order to show how 3D-printing can allow controlling mass, weight, absorption level and power behaviour. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=additive%20manufacturing" title="additive manufacturing">additive manufacturing</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20composite%20materials" title=" electromagnetic composite materials"> electromagnetic composite materials</a>, <a href="https://publications.waset.org/abstracts/search?q=microwave%20measurements" title=" microwave measurements"> microwave measurements</a>, <a href="https://publications.waset.org/abstracts/search?q=passive%20components" title=" passive components"> passive components</a>, <a href="https://publications.waset.org/abstracts/search?q=power%20handling%20capacity%20%28PHC%29" title=" power handling capacity (PHC)"> power handling capacity (PHC)</a>, <a href="https://publications.waset.org/abstracts/search?q=3D-printing" title=" 3D-printing"> 3D-printing</a> </p> <a href="https://publications.waset.org/abstracts/191309/3d-printing-of-waveguide-terminations-effect-of-material-shape-and-structuring-on-their-characteristics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/191309.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">20</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">65</span> Preparation of Nanophotonics LiNbO3 Thin Films and Studying Their Morphological and Structural Properties by Sol-Gel Method for Waveguide Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Fakhri%20Makram">A. Fakhri Makram</a>, <a href="https://publications.waset.org/abstracts/search?q=Marwa%20S.%20Alwazni"> Marwa S. Alwazni</a>, <a href="https://publications.waset.org/abstracts/search?q=Al-Douri%20Yarub"> Al-Douri Yarub</a>, <a href="https://publications.waset.org/abstracts/search?q=Evan%20T.%20Salim"> Evan T. Salim</a>, <a href="https://publications.waset.org/abstracts/search?q=Hashim%20Uda"> Hashim Uda</a>, <a href="https://publications.waset.org/abstracts/search?q=Chin%20C.%20Woei"> Chin C. Woei </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Lithium niobate (LiNbO<sub>3</sub>) nanostructures are prepared on quartz substrate by the sol-gel method. They have been deposited with different molarity concentration and annealed at 500°C. These samples are characterized and analyzed by X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Atomic Force Microscopy (AFM). The measured results showed an importance increasing in molarity concentrations that indicate the structure starts to become crystal, regular, homogeneous, well crystal distributed, which made it more suitable for optical waveguide application. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=lithium%20niobate" title="lithium niobate">lithium niobate</a>, <a href="https://publications.waset.org/abstracts/search?q=morphological%20properties" title=" morphological properties"> morphological properties</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20film" title=" thin film"> thin film</a>, <a href="https://publications.waset.org/abstracts/search?q=pechini%20method" title=" pechini method"> pechini method</a>, <a href="https://publications.waset.org/abstracts/search?q=XRD" title=" XRD"> XRD</a> </p> <a href="https://publications.waset.org/abstracts/43296/preparation-of-nanophotonics-linbo3-thin-films-and-studying-their-morphological-and-structural-properties-by-sol-gel-method-for-waveguide-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43296.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">446</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">64</span> Design for Filter and Transitions to Substrat Integated Waveguide at Ka Band</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Damou%20Mehdi">Damou Mehdi</a>, <a href="https://publications.waset.org/abstracts/search?q=Nouri%20Keltouma"> Nouri Keltouma</a>, <a href="https://publications.waset.org/abstracts/search?q=Fahem%20Mohammed"> Fahem Mohammed</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, the concept of substrate integrated waveguide (SIW) technology is used to design filter for 30 GHz communication systems. SIW is created in the substrate of RT/Duroid 5880 having relative permittivity ε_r= 2.2 and loss tangent tanφ = 0.0009. Four Via are placed on the century filter the structures of SIW are modeled using and have been optimized in software HFSS (High Frequency Structure Simulator), à transition is designed for a Ka-band transceiver module with a 28.5GHz center frequency, . and then the results are verified using another simulation CST Microwave Studio (Computer Simulation Technology). The return loss are less than -18 dB, and -13 dB respectively. The insertion loss is divided equally -1.2 dB and -1.4 respectively. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=transition" title="transition">transition</a>, <a href="https://publications.waset.org/abstracts/search?q=microstrip" title=" microstrip"> microstrip</a>, <a href="https://publications.waset.org/abstracts/search?q=substrat%20integrated%20wave%20guide" title=" substrat integrated wave guide"> substrat integrated wave guide</a>, <a href="https://publications.waset.org/abstracts/search?q=filter" title=" filter"> filter</a>, <a href="https://publications.waset.org/abstracts/search?q=via" title=" via"> via</a> </p> <a href="https://publications.waset.org/abstracts/20291/design-for-filter-and-transitions-to-substrat-integated-waveguide-at-ka-band" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20291.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">654</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">63</span> Analysis of 3 dB Directional Coupler Based On Silicon-On-Insulator (SOI) Large Cross-Section Rib Waveguide</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nurdiani%20Zamhari">Nurdiani Zamhari</a>, <a href="https://publications.waset.org/abstracts/search?q=Abang%20Annuar%20Ehsan"> Abang Annuar Ehsan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The 3 dB directional coupler is designed by using silicon-on-insulator (SOI) large cross-section and simulate by Beam Propagation Method at the communication wavelength of 1.55 µm and 1.48 µm. The geometry is shaped with rib height (H) of 6 µm and varied in step factor (r) which is 0.5, 0.6, 0.7 and 0.8. The wave guide spacing is also fixed to 5 µm and the slab width is symmetrical. In general, the 3 dB coupling lengths for four different cross-sections are several millimetre long. The 1.48 of wavelength give the longer coupling length if compare to 1.55 at the same step factor (r). Besides, the low loss propagation is achieved with less than 2 % of propagation loss. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=3%20dB%20directional%20couplers" title="3 dB directional couplers">3 dB directional couplers</a>, <a href="https://publications.waset.org/abstracts/search?q=silicon-on-insulator" title=" silicon-on-insulator"> silicon-on-insulator</a>, <a href="https://publications.waset.org/abstracts/search?q=symmetrical%20rib%20waveguide" title=" symmetrical rib waveguide"> symmetrical rib waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=OptiBPM%209" title=" OptiBPM 9 "> OptiBPM 9 </a> </p> <a href="https://publications.waset.org/abstracts/19712/analysis-of-3-db-directional-coupler-based-on-silicon-on-insulator-soi-large-cross-section-rib-waveguide" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19712.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">516</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">62</span> Sol-Gel Erbium-Doped Silica-Hafnia Planar Waveguides</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mustapha%20El%20Mataouy">Mustapha El Mataouy</a>, <a href="https://publications.waset.org/abstracts/search?q=Abellatif%20Aaliti"> Abellatif Aaliti</a>, <a href="https://publications.waset.org/abstracts/search?q=Mouhamed%20Khaddor"> Mouhamed Khaddor</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Erbium actived silica-hafnia planar waveguides have been prepared by sol-gel route. The films were deposited on vitreous silica substrates using dip-coating technique. The parameters of preparation have been chosen to optimize the waveguides for operation in the near infrared (NIR) region, and to increase the luminescence efficiency of the metastable 4I13/2 state of Erbium ions. The waveguides properties were determined by m-lines spectroscopy, loss measurements. Waveguide Raman and luminescence spectroscopy were used to obtain information about the structure of the prepared films and about the dynamical process related to the emission in the C telecom band (1530nm-1565nm) of the Erbium ions. The results are discussed with the aim of comparing the structural and optical properties of Erbium activated silica-hafnia planar waveguides with different molar ratio of Si / Hf. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=erbium" title="erbium">erbium</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20amplifiers" title=" optical amplifiers"> optical amplifiers</a>, <a href="https://publications.waset.org/abstracts/search?q=silica-hafnia" title=" silica-hafnia"> silica-hafnia</a>, <a href="https://publications.waset.org/abstracts/search?q=sol-gel" title=" sol-gel"> sol-gel</a>, <a href="https://publications.waset.org/abstracts/search?q=waveguide" title=" waveguide"> waveguide</a> </p> <a href="https://publications.waset.org/abstracts/59785/sol-gel-erbium-doped-silica-hafnia-planar-waveguides" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/59785.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">230</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">61</span> An Energy Efficient Spectrum Shaping Scheme for Substrate Integrated Waveguides Based on Spread Reshaping Code</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yu%20Zhao">Yu Zhao</a>, <a href="https://publications.waset.org/abstracts/search?q=Rainer%20Gruenheid"> Rainer Gruenheid</a>, <a href="https://publications.waset.org/abstracts/search?q=Gerhard%20Bauch"> Gerhard Bauch</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the microwave and millimeter-wave transmission region, substrate-integrated waveguide (SIW) is a very promising candidate for the development of circuits and components. It facilitates the transmission at the data rates in excess of 200 Gbit/s. An SIW mimics a rectangular waveguide by approximating the closed sidewalls with a via fence. This structure suppresses the low frequency components and makes the channel of the SIW a bandpass or high pass filter. This channel characteristic impedes the conventional baseband transmission using non-return-to-zero (NRZ) pulse shaping scheme. Therefore, mixers are commonly proposed to be used as carrier modulator and demodulator in order to facilitate a passband transmission. However, carrier modulation is not an energy efficient solution, because modulation and demodulation at high frequencies consume a lot of energy. For the first time to our knowledge, this paper proposes a spectrum shaping scheme of low complexity for the channel of SIW, namely spread reshaping code. It aims at matching the spectrum of the transmit signal to the channel frequency response. It facilitates the transmission through the SIW channel while it avoids using carrier modulation. In some cases, it even does not need equalization. Simulations reveal a good performance of this scheme, such that, as a result, eye opening is achieved without any equalization or modulation for the respective transmission channels. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bandpass%20channel" title="bandpass channel">bandpass channel</a>, <a href="https://publications.waset.org/abstracts/search?q=eye-opening" title=" eye-opening"> eye-opening</a>, <a href="https://publications.waset.org/abstracts/search?q=switching%20frequency" title=" switching frequency"> switching frequency</a>, <a href="https://publications.waset.org/abstracts/search?q=substrate-integrated%20waveguide" title=" substrate-integrated waveguide"> substrate-integrated waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=spectrum%20shaping%20scheme" title=" spectrum shaping scheme"> spectrum shaping scheme</a>, <a href="https://publications.waset.org/abstracts/search?q=spread%20reshaping%20code" title=" spread reshaping code"> spread reshaping code</a> </p> <a href="https://publications.waset.org/abstracts/97740/an-energy-efficient-spectrum-shaping-scheme-for-substrate-integrated-waveguides-based-on-spread-reshaping-code" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/97740.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">160</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">60</span> Self-Action of Pyroelectric Spatial Soliton in Undoped Lithium Niobate Samples with Pyroelectric Mechanism of Nonlinear Response</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Anton%20S.%20Perin">Anton S. Perin</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20M.%20Shandarov"> Vladimir M. Shandarov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Compensation for the nonlinear diffraction of narrow laser beams with wavelength of 532 and the formation of photonic waveguides and waveguide circuits due to the contribution of pyroelectric effect to the nonlinear response of lithium niobate crystal have been experimentally demonstrated. Complete compensation for the linear and nonlinear diffraction broadening of light beams is obtained upon uniform heating of an undoped sample from room temperature to 55 degrees Celsius. An analysis of the light-ﬁeld distribution patterns and the corresponding intensity distribution proﬁles allowed us to estimate the spacing for the channel waveguides. The observed behavior of bright soliton beams may be caused by their coherent interaction, which manifests itself in repulsion for anti-phase light ﬁelds and in attraction for in-phase light ﬁelds. The experimental results of this study showed a fundamental possibility of forming optically complex waveguide structures in lithium niobate crystals with pyroelectric mechanism of nonlinear response. The topology of these structures is determined by the light ﬁeld distribution on the input face of crystalline sample. The optical induction of channel waveguide elements by interacting spatial solitons makes it possible to design optical systems with a more complex topology and a possibility of their dynamic reconﬁguration. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=self-action" title="self-action">self-action</a>, <a href="https://publications.waset.org/abstracts/search?q=soliton" title=" soliton"> soliton</a>, <a href="https://publications.waset.org/abstracts/search?q=lithium%20niobate" title=" lithium niobate"> lithium niobate</a>, <a href="https://publications.waset.org/abstracts/search?q=piroliton" title=" piroliton"> piroliton</a>, <a href="https://publications.waset.org/abstracts/search?q=photorefractive%20effect" title=" photorefractive effect"> photorefractive effect</a>, <a href="https://publications.waset.org/abstracts/search?q=pyroelectric%20effect" title=" pyroelectric effect"> pyroelectric effect</a> </p> <a href="https://publications.waset.org/abstracts/89331/self-action-of-pyroelectric-spatial-soliton-in-undoped-lithium-niobate-samples-with-pyroelectric-mechanism-of-nonlinear-response" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/89331.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">167</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">59</span> mm-Wave Wearable Edge Computing Module Hosted by Printed Ridge Gap Waveguide Structures: A Physical Layer Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Matthew%20Kostawich">Matthew Kostawich</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Elmorsy"> Mohammed Elmorsy</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Sayed%20Sifat"> Mohamed Sayed Sifat</a>, <a href="https://publications.waset.org/abstracts/search?q=Shoukry%20Shams"> Shoukry Shams</a>, <a href="https://publications.waset.org/abstracts/search?q=Mahmoud%20Elsaadany"> Mahmoud Elsaadany</a> </p> <p class="card-text"><strong>Abstract:</strong></p> 6G communication systems represent the nominal future extension of current wireless technology, where its impact is extended to touch upon all human activities, including medical, security, and entertainment applications. As a result, human needs are allocated among the highest priority aspects of the system design and requirements. 6G communications is expected to replace all the current video conferencing with interactive virtual reality meetings involving high data-rate transmission merged with massive distributed computing resources. In addition, the current expansion of IoT applications must be mitigated with significant network changes to provide a reasonable Quality of Service (QoS). This directly implies a high demand for Human-Computer Interaction (HCI) through mobile computing modules in future wireless communication systems. This article proposes the utilization of a Printed Ridge Gap Waveguide (PRGW) to host the wearable nodes. To the best of our knowledge, we propose for the first time a physical layer analysis within the context of a complete architecture. A thorough study is provided on the impact of the distortion of the guiding structure on the overall system performance. The proposed structure shows small latency and small losses, highlighting its compatibility with future applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ridge%20gap%20waveguide" title="ridge gap waveguide">ridge gap waveguide</a>, <a href="https://publications.waset.org/abstracts/search?q=edge%20computing%20module" title=" edge computing module"> edge computing module</a>, <a href="https://publications.waset.org/abstracts/search?q=6G" title=" 6G"> 6G</a>, <a href="https://publications.waset.org/abstracts/search?q=multimedia%20IoT%20applications" title=" multimedia IoT applications"> multimedia IoT applications</a> </p> <a href="https://publications.waset.org/abstracts/182712/mm-wave-wearable-edge-computing-module-hosted-by-printed-ridge-gap-waveguide-structures-a-physical-layer-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/182712.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">71</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">58</span> Temperature Effect on Sound Propagation in an Elastic Pipe with Viscoelastic Liquid</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Levitsky">S. Levitsky</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Bergman"> R. Bergman</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Fluid rheology may have essential impact on sound propagation in a liquid-filled pipe, especially, in a low frequency range. Rheological parameters of liquid are temperature-sensitive, which ultimately results in a temperature dependence of the wave speed and attenuation in the waveguide. The study is devoted to modeling of this effect at sound propagation in an elastic pipe with polymeric liquid, described by generalized Maxwell model with non-zero high-frequency viscosity. It is assumed that relaxation spectrum is distributed according to the Spriggs law; temperature impact on the liquid rheology is described on the basis of the temperature-superposition principle and activation theory. The dispersion equation for the waveguide, considered as a thin-walled tube with polymeric solution, is obtained within a quasi-one-dimensional formulation. Results of the study illustrate the influence of temperature on sound propagation in the system. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=elastic%20tube" title="elastic tube">elastic tube</a>, <a href="https://publications.waset.org/abstracts/search?q=sound%20propagation" title=" sound propagation"> sound propagation</a>, <a href="https://publications.waset.org/abstracts/search?q=temperature%20effect" title=" temperature effect"> temperature effect</a>, <a href="https://publications.waset.org/abstracts/search?q=viscoelastic%20liquid" title=" viscoelastic liquid"> viscoelastic liquid</a> </p> <a href="https://publications.waset.org/abstracts/12837/temperature-effect-on-sound-propagation-in-an-elastic-pipe-with-viscoelastic-liquid" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/12837.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">420</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">57</span> All-Silicon Raman Laser with Quasi-Phase-Matched Structures and Resonators</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Isao%20Tomita">Isao Tomita</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The principle of all-silicon Raman lasers for an output wavelength of 1.3 μm is presented, which employs quasi-phase-matched structures and resonators to enhance the output power. 1.3-μm laser beams for GE-PONs in FTTH systems generated from a silicon device are very important because such a silicon device can be monolithically integrated with the silicon planar lightwave circuits (Si PLCs) used in the GE-PONs. This reduces the device fabrication processes and time and also optical losses at the junctions between optical waveguides of the Si PLCs and Si laser devices when compared with 1.3-μm III-V semiconductor lasers set on the Si PLCs employed at present. We show that the quasi-phase-matched Si Raman laser with resonators can produce about 174 times larger laser power at 1.3 μm (at maximum) than that without resonators for a Si waveguide of Raman gain 20 cm/GW and optical loss 1.2 dB/cm, pumped at power 10 mW, where the length of the waveguide is 3 mm and its cross-section is (1.5 μm)2. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=All-Silicon%20Raman%20Laser" title="All-Silicon Raman Laser">All-Silicon Raman Laser</a>, <a href="https://publications.waset.org/abstracts/search?q=FTTH" title=" FTTH"> FTTH</a>, <a href="https://publications.waset.org/abstracts/search?q=GE-PON" title=" GE-PON"> GE-PON</a>, <a href="https://publications.waset.org/abstracts/search?q=Quasi-Phase-Matched%20Structure" title=" Quasi-Phase-Matched Structure"> Quasi-Phase-Matched Structure</a>, <a href="https://publications.waset.org/abstracts/search?q=resonator" title=" resonator"> resonator</a> </p> <a href="https://publications.waset.org/abstracts/63334/all-silicon-raman-laser-with-quasi-phase-matched-structures-and-resonators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63334.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">253</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">56</span> Design of a 28-nm CMOS 2.9-64.9-GHz Broadband Distributed Amplifier with Floating Ground CPW</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tian-Wei%20Huang">Tian-Wei Huang</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei-Ting%20Bai"> Wei-Ting Bai</a>, <a href="https://publications.waset.org/abstracts/search?q=Yu-Tung%20Cheng"> Yu-Tung Cheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Jeng-Han%20Tsai"> Jeng-Han Tsai</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, a 1-stage 6-section conventional distributed amplifier (CDA) structure distributed power amplifier (DPA) fabricated in a 28-nm HPC+ 1P9M CMOS process is proposed. The transistor size selection is introduced to achieve broadband power matching and thus remains a high flatness output power and power added efficiency (PAE) within the bandwidth. With the inductive peaking technique, the high-frequency pole appears and the high-frequency gain is increased; the gain flatness becomes better as well. The inductive elements used to form an artificial transmission line are built up with a floating ground coplanar waveguide plane (CPWFG) rather than a microstrip line, coplanar waveguide (CPW), or spiral inductor to get better performance. The DPA achieves 12.6 dB peak gain at 52.5 GHz with 2.9 to 64.9 GHz 3-dB bandwidth. The Psat is 11.4 dBm with PAEMAX of 10.6 % at 25 GHz. The output 1-dB compression point power is 9.8 dBm. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=distributed%20power%20amplifier%20%28DPA%29" title="distributed power amplifier (DPA)">distributed power amplifier (DPA)</a>, <a href="https://publications.waset.org/abstracts/search?q=gain%20bandwidth%20%28GBW%29" title=" gain bandwidth (GBW)"> gain bandwidth (GBW)</a>, <a href="https://publications.waset.org/abstracts/search?q=floating%20ground%20CPW" title=" floating ground CPW"> floating ground CPW</a>, <a href="https://publications.waset.org/abstracts/search?q=inductive%20peaking" title=" inductive peaking"> inductive peaking</a>, <a href="https://publications.waset.org/abstracts/search?q=28-nm" title=" 28-nm"> 28-nm</a>, <a href="https://publications.waset.org/abstracts/search?q=CMOS" title=" CMOS"> CMOS</a>, <a href="https://publications.waset.org/abstracts/search?q=5G." title=" 5G."> 5G.</a> </p> <a href="https://publications.waset.org/abstracts/161176/design-of-a-28-nm-cmos-29-649-ghz-broadband-distributed-amplifier-with-floating-ground-cpw" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/161176.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">81</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">55</span> Wave Interaction with Defects in Pressurized Composite Structures</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=R.%20K.%20Apalowo">R. K. Apalowo</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20Chronopoulos"> D. Chronopoulos</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20Thierry"> V. Thierry</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A wave finite element (WFE) and finite element (FE) based computational method is presented by which the dispersion properties as well as the wave interaction coefficients for one-dimensional structural system can be predicted. The structural system is discretized as a system comprising a number of waveguides connected by a coupling joint. Uniform nodes are ensured at the interfaces of the coupling element with each waveguide. Then, equilibrium and continuity conditions are enforced at the interfaces. Wave propagation properties of each waveguide are calculated using the WFE method and the coupling element is modelled using the FE method. The scattering of waves through the coupling element, on which damage is modelled, is determined by coupling the FE and WFE models. Furthermore, the central aim is to evaluate the effect of pressurization on the wave dispersion and scattering characteristics of the prestressed structural system compared to that which is not prestressed. Numerical case studies are exhibited for two waveguides coupled through a coupling joint. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Finite%20Element" title="Finite Element">Finite Element</a>, <a href="https://publications.waset.org/abstracts/search?q=Prestressed%20Structures" title=" Prestressed Structures"> Prestressed Structures</a>, <a href="https://publications.waset.org/abstracts/search?q=Wave%20Finite%20Element" title="Wave Finite Element">Wave Finite Element</a>, <a href="https://publications.waset.org/abstracts/search?q=Wave%20Propagation%20Properties" title=" Wave Propagation Properties"> Wave Propagation Properties</a>, <a href="https://publications.waset.org/abstracts/search?q=Wave%20Scattering%20Coefficients." title=" Wave Scattering Coefficients."> Wave Scattering Coefficients.</a> </p> <a href="https://publications.waset.org/abstracts/58482/wave-interaction-with-defects-in-pressurized-composite-structures" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/58482.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">294</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">54</span> Study, Design, Simulation and Fabrication of Microwave Slot Antenna</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Khaled%20A.%20Madi">Khaled A. Madi</a>, <a href="https://publications.waset.org/abstracts/search?q=Rema%20A.%20Mousbahi"> Rema A. Mousbahi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mostafa%20B.%20Abuitbel"> Mostafa B. Abuitbel</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdualhakim%20O.%20Nagi"> Abdualhakim O. Nagi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Antenna perhaps is the most important part of any communication system, it determines the overall efficiency and the direction of radiation of the system. Antennas vary in shape and size on a very wide range. For fast moving vehicles, the antenna should offer as litter aerodynamic resistance as possible. Slot antenna is best suited for this purpose. It offers very little aerodynamic resistance, compact, easy to feed and fabricate. This work presented in this paper deals with the investigation of a half wave slot antenna. The antenna has been studied, analyzed, designed, simulated, fabrication, and tested at the X-band. The field of antenna study is an extremely vast one, and to grasp the fundamentals, two pronged approaches have been used, and the focus was on the fabrication and testing of a slot waveguide directional antenna. Focuses on the design and simulation of slot antennas with an emphasis on optimization of a 9.1 GHz a rectangular waveguide have been used to feed slot antenna. A microwave fed slot antenna used in the communication lab was also simulated. The results have been presented and compared with the expected values, where a good agreement was achieved between the simulation and experimental results. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=microwave" title="microwave">microwave</a>, <a href="https://publications.waset.org/abstracts/search?q=slot%20antenna" title=" slot antenna"> slot antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=simulation" title=" simulation"> simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=fabrication" title=" fabrication"> fabrication</a> </p> <a href="https://publications.waset.org/abstracts/152371/study-design-simulation-and-fabrication-of-microwave-slot-antenna" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/152371.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> 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