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Article · IEEE Transactions on Components Packaging and Manufacturing Technology · March 2, 2017

A Dual-Band Port-Extended Branch-Line Coupler and Mitigation of the Band-Ratio and Power Division Limitations

Mohammad A. Maktoomi, Mohammad Hashmi, Fadhel M. Ghannouchi

Mohammad Hashmi
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Abstract

In this paper, enhanced designs of port-extended branch-line coupler (BLC) are presented. Initially, the analysis of the conventional dual-band port-extended equal-division BLC is presented to deduce its operation from Riblet's viewpoint. Subsequently, it is shown that extending the Riblet's concept to dual-band design results in a novel dual-band BLC with arbitrary power division ratios. It has also been identified that the proposed design possesses a free design variable that allows realization of BLC with higher band-ratio. Furthermore, another BLC structure, capable of achieving enhanced band-ratio, utilizing two-section transmission line at each port is also proposed. All the reported design equations are in closed form and are very simple and do not go beyond a second-degree polynomial. The effectiveness of the proposed technique is demonstrated through test cases for equal and unequal power division ratio and for numerous band-ratio (=f2/f1). The good agreement between the electromagnetic simulated results and the measured results from the two unequal power division BLC prototypes, on Rogers RO4003C substrate, operating at 1.2 GHz/2.52 GHz and 1 GHz/2 GHz validate the proposed approach.

Microwave Engineering and WaveguidesAntenna Design and AnalysisMicrowave and Dielectric Measurement Techniquesbranch-line couplerdual-band couplerport extension

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