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,  

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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.