Wideband Waveguide Short-Slot 2-Plane Coupler Using Frequency Shift of Propagating Modes

Dong-Hun KIM  Jiro HIROKAWA  Makoto ANDO  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.10   pp.815-821
Publication Date: 2018/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.815
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
short-slot coupler,  hybrid coupler,  cross coupler,  complementary propagating mode,  

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A wideband design of the waveguide short-slot 2-plane coupler with 2×2 input/output ports is designed, fabricated, and evaluated. Using coupling coefficients of complementary propagating modes which are TE11, TE21, and TE30 modes, the flatness of the output amplitudes of 2-plane coupler is improved. The coupler operates from 4.96GHz to 5.27GHz (bandwidth 6.1%) which is wider than the former coupler without considering the complementary propagating mode from 5.04GHz to 5.17GHz (bandwidth 2.5%).