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Cruciform Directional Couplers in E-Plane Rectangular Waveguide
Mitsuyoshi KISHIHARA Isao OHTA Kuniyoshi YAMANE
Publication
IEICE TRANSACTIONS on Electronics
Vol.E90-C
No.9
pp.1743-1748 Publication Date: 2007/09/01 Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.9.1743 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology) Category: Passive Devices/Circuits Keyword: microwave devices, directional couplers, rectangular waveguides, design automation, genetic algorithms,
Full Text: PDF(658KB)>>
Summary:
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.
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