Design for Operation in Two Frequency Bands by Division of the Coupled Region in a Waveguide 2-Plane Coupler

Shihao CHEN; Takashi TOMURA; Jiro HIROKAWA; Kota ITO; Mizuki SUGA; Yushi SHIRATO; Daisei UCHIDA; Naoki KITA

doi:10.1587/transele.2022ECP5004

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Design for Operation in Two Frequency Bands by Division of the Coupled Region in a Waveguide 2-Plane Coupler

Shihao CHEN, Takashi TOMURA, Jiro HIROKAWA, Kota ITO, Mizuki SUGA, Yushi SHIRATO, Daisei UCHIDA, Naoki KITA

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Keywords: coupler, finite element method, hollow waveguide, mode matching

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2022 Volume E105.C Issue 12 Pages 729-739

DOI https://doi.org/10.1587/transele.2022ECP5004

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Abstract

A waveguide 2-plane hybrid coupler with two operating bands is proposed. The cross-sectional shape of the coupled region inside the proposed coupler is designed with a two-dimensional arbitrary geometry sorting method. Simulations of the proposed hybrid coupler has a fractional bandwidth (FBW) of 2.17% at the center of 24.99GHz, and at the center of 28.28GHz an FBW of 6.13%. The proposed coupler is analyzed by the mode-matching finite-element hybrid method, and the final result is obtained using a genetic algorithm. The analyzed result of the coupling for the main modes in the coupled region is presented. The design result is confirmed by measurements.

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