Rat-Race Hybrid Rings with a Microwave C-Section

Iwata SAKAGAMI  Hiroshi MASUDA  Shinji NAGAMINE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.8   pp.1033-1039
Publication Date: 1995/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
rat-race,  hybrid-ring,  coupled-line,  even odd decomposition,  size reduction,  

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Summary: 
A rat-race hybrid-ring which includes a coupled-line called microwave C-section is proposed for size reduction. The perfect input match, isolation, equal power split and certain phase differences between two output ports can be satisfied at center frequency as in a normal hybrid-ring. The size of the proposed circuit becomes smaller than that of a normal rat-race built up with a folded non-coupled 3/4-wavelength transmission line, although the frequency characteristics are slightly damaged by the electromagnetic coupling between two folded strips. Theoretical results based on the even and odd mode decomposition method are in good agreement with those of the experimental circuit fabricated at 1 GHz.