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This paper presents the design and performance characteristics of a novel broadband passive differential coupler that has been developed for MMIC's applications. The new coupler utilizes a multi-dielectric layer structure to achieve a broadband performance from 20 to 40 GHz in a simple coplanar configuration. A return loss better than 20 dB, with an isolation of 25 dB have been achieved over the band of interest. Also a phase and amplitude mismatch better than 2° and 1 dB has been realized over the frequency band from 20 to 40 GHz. This performance is especially important to the intended use with wideband double balanced mixers, and amplifiers.
Date of Conference: 12-17 June 2005