Analysis of circular-to-rectangular waveguide T-junction using mode-matching technique

In the feed system for an orthogonal two‐polarization antenna, a polarization diplexer is used for separating the vertical and horizontal polarizations. In this paper, the three‐dimensional (3‐D) electromagnetic field analysis by the mode matching method is carried out for the circular‐to‐rectangula...

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Bibliographic Details
Published in:	Electronics & communications in Japan. Part 2, Electronics Vol. 80; no. 7; pp. 37 - 46
Main Authors:	Yoneda, Naofumi, Miyasaki, Moriyasu, Nishino, Tamotsu, Asao, Hideki, Nakaguro, Hiromasa, Betsudan, Shin-ichi
Format:	Journal Article
Language:	English
Published:	New York Wiley Subscription Services, Inc., A Wiley Company 01-07-1997
Subjects:	mode matching waveguide waveguide discontinuity waveguide junction waveguide-type polarization diplexer
Online Access:	Get full text
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Summary:	In the feed system for an orthogonal two‐polarization antenna, a polarization diplexer is used for separating the vertical and horizontal polarizations. In this paper, the three‐dimensional (3‐D) electromagnetic field analysis by the mode matching method is carried out for the circular‐to‐rectangular waveguide T‐junction used in the polarization diplexer. Its scattering matrix is theoretically derived. As mode functions inside the T‐junction, the TE and TM modes in a parallel plate radial waveguide are used. Then, it becomes possible to provide the continuity conditions for the electric and magnetic tangential field components not only at the junction between the junction and the circuit waveguide, but also at the junction between the junction and the rectangular waveguide as well as on the junction wall. Also, by providing an approximate boundary condition at the junction plane between the junction and the rectangular waveguide, the scattering matrix can be formulated in the form that does not contain numerical integration. The numerical results obtained by the present analysis method agreed well with those by the three‐dimensional finite‐element method and the measured results. © 1998 Scripta Technica. Electron Comm Jpn Pt 2, 80(7), 37–46, 1997
Bibliography:	ark:/67375/WNG-SQ2WBM0S-L ArticleID:ECJB5 istex:F472BBEC60EFE57994FDA31B95048B2D7C7A87C5
ISSN:	8756-663X 1520-6432
DOI:	10.1002/(SICI)1520-6432(199707)80:7<37::AID-ECJB5>3.0.CO;2-0