Asymmetrical Coupled-HNRD-Guide Directional Couplers with Flat Coupling

Mitsuyoshi KISHIHARA  Isao OHTA  Tadashi KAWAI  Kuniyoshi YAMANE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.2   pp.126-133
Publication Date: 2003/02/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Passive (Coupler)
Keyword: 
NRD guide,  transverse resonance technique,  directional coupler,  millimeter wave,  coupled-line,  

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Summary: 
Directional couplers with flat coupling are designed by using an asymmetrical coupled-HNRD-guide consisting of two HNRD guides of different cross sections arranged closely. First, propagation characteristics of the asymmetrical coupled-HNRD-guide are analyzed by the transverse resonance technique. Next, the whole directional couplers including tapered sections are designed from the S-parameters of the coupled HNRD guides derived from a superposition of the even-like and odd-like modes. Finally, the validity of the design procedure is confirmed by an em-simulator (HFSS).