volume | PIER Journals

Abstract

In this letter, a modified broadband 90° phase shifter is proposed. By using a dentate microstrip and a patterned ground plane, an extremely tight coupling can be obtained, and consequently a constant phase shift over a wide bandwidth can be achieved. To verify the proposed idea, a topology is implemented, the measured results of a phase difference of 90 ± 5° in 79.5% bandwidth, better than 10 dB return loss across the whole operating band, are also given. The measurement results agree well with the full-wave electromagnetic simulated responses.

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Dr. Zheng Zhang

Dr. Yong-Chang Jiao

Dr. Shun-Feng Cao

Dr. Xiao-Ming Wang

Dr. Fu-Shun Zhang