Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 61, Issue 1, Pages 55-60Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2012.2228219
Keywords
Planar circuits; rat-race coupler; tuning diodes; variable power dividing ratio
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Funding
- Chinese University of Hong Kong, Hong Kong [2050504]
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This paper presents, for the first time, a novel rat-race coupler design with tunable power dividing ratio. Wide tuning ratio is accomplished by the use of two tuning diodes and a single control voltage. Ideal port isolation and return loss characteristics, evaluated at the center frequency of operation, are proven for all dividing ratios. The structure is simple to construct and involves 50-ohm lines only. For verification, the simulated and measured results of a 1-GHz rat-race coupler implemented on microstrip are shown.
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