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Microstrip Branch-Line Couplers for Crossover Application

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3 Author(s)
Jijun Yao ; Inst. for Infocomm Res., A*STAR, Singapore, Singapore ; Lee, C. ; Swee Ping Yeo

The branch-line coupler may be redesigned for crossover application. The bandwidth of such a coupler can be extended by suitably incorporating additional sections into the composite design. Laboratory tests on microstrip prototypes have shown the return loss and isolation of the three- and four-section couplers to be better than 20 dB over bandwidths of 22% and 33%, respectively. The insertion losses and group delays vary by less than ±0.05 dB and ±1 ns, respectively, for both prototypes.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 1 )