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Cruciform Directional Couplers in E-Plane Rectangular Waveguide
Mitsuyoshi KISHIHARA Isao OHTA Kuniyoshi YAMANE
IEICE TRANSACTIONS on Electronics
Publication Date: 2007/09/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Passive Devices/Circuits
microwave devices, directional couplers, rectangular waveguides, design automation, genetic algorithms,
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This paper proposes a new type of compact waveguide directional coupler, which is constructed from two crossed E-plane rectangular waveguide with two metallic posts in the square junction and one metallic post at each port. The metallic posts in the square junction are set symmetrically along a diagonal line to obtain the directivity properties. The metallic post inserted at each input/output waveguide port can realize a matched state. Tight-coupling properties 0.79-6 dB are realized by optimizing the dimension of the junction and the positions/radii of the posts. The design results are verified by an em-simulator (Ansoft HFSS) and experiments.