Wave Propagation in Lossy and Superconducting Circular Waveguides

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dc.contributor.authorYeap, Kim Ho
dc.contributor.authorTham, Choy Yoong
dc.contributor.authorYeong, Kee Choon
dc.contributor.authorWoo, Haw Jiunn
dc.coverage.issue2cs
dc.coverage.volume19cs
dc.date.accessioned2016-03-11T09:18:24Z
dc.date.available2016-03-11T09:18:24Z
dc.date.issued2010-06cs
dc.description.abstractWe present an accurate approach to compute the attenuation of waves, propagating in circular waveguides with lossy and superconducting walls. A set of transcendental equation is developed by matching the fields at the surface of the wall with the electrical properties of the wall material. The propagation constant kz is found by numerically solving for the root of the equation. The complex conductivity of the superconductor is obtained from the Mattis-Bardeen equations. We have compared the loss of TE11 mode computed using our technique with that using the perturbation and Stratton’s methods. The results from the three methods agree very well at a reasonable range of frequencies above the cutoff. The curves, however, deviate below cutoff and at millimeter wave frequencies. We attribute the discrepancies to the dispersive effect and the presence of the longitudinal fields in a lossy waveguide. At frequencies below the gap, the superconducting waveguide exhibits lossless transmission behavior. Above the gap frequency, Cooper-pair breaking becomes dominant and the loss increases significantly.en
dc.formattextcs
dc.format.extent320-325cs
dc.format.mimetypeapplication/pdfen
dc.identifier.citationRadioengineering. 2010, vol. 19, č. 2, s. 320-325. ISSN 1210-2512cs
dc.identifier.issn1210-2512
dc.identifier.urihttp://hdl.handle.net/11012/56999
dc.language.isoencs
dc.publisherSpolečnost pro radioelektronické inženýrstvícs
dc.relation.ispartofRadioengineeringcs
dc.relation.urihttp://www.radioeng.cz/fulltexts/2010/10_02_320_325.pdfcs
dc.rightsCreative Commons Attribution 3.0 Unported Licenseen
dc.rights.accessopenAccessen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.subjectCircular waveguidesen
dc.subjectsuperconductoren
dc.subjectpropagation constanten
dc.subjectdispersive effecten
dc.subjectCooper-pairen
dc.titleWave Propagation in Lossy and Superconducting Circular Waveguidesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.affiliatedInstitution.facultyFakulta eletrotechniky a komunikačních technologiícs
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