Ku/Ka-band Compact Orthomode Junction with Low Pass Filters for High Power Applications

Hidenori YUKAWA  Koji YOSHIDA  Tomohiro MIZUNO  Tetsu OWADA  Moriyasu MIYAZAKI  

IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.2   pp.156-161
Publication Date: 2015/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.156
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
waveguide,  antenna feed,  polarization,  orthomode junction,  wideband,  

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This paper presents a compact orthomode junction with low pass filters for high power applications. It consists of a circular waveguide step, a matching element for a high frequency band, and coupling sections straddle the circular waveguide step. These dimensions were optimized to achieve wideband performances and to support a high power rating. The structure without rectangular to circular transition is simple and comprised of two milled layers to divide E-plane of corrugated low pass filters. It can be easily manufactured and has low losses. The fabricated Ku/Ka-band orthomode junction was measured including power handling test of 2 kW at Ku-band. The measurement results demonstrated return loss of 21 dB and loss of 0.2 dB in the Ku- and Ka- band.