Abstract

A design method for a multisection impedance-transforming branch-line hybrid using a genetic algorithm is proposed. In contrast to the previous design methods, an asymmetric structure is introduced to optimize the hybrid. Optimization is performed within the impedance range to achieve the realizable hybrids with a microstrip line in a desired frequency range. The hybrid designed by the proposed method has 3–10% more bandwidth than the previous results. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 436–439, 1999

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