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High selectivity wideband 180° phase shifters with the functionality of vertical transition

Published online by Cambridge University Press:  19 August 2020

Yu Zhu
Affiliation:
EHF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu, 611731, China
Kaijun Song*
Affiliation:
EHF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu, 611731, China
Yong Fan
Affiliation:
EHF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu, 611731, China
*
Author for correspondence: Kaijun Song, E-mail: [email protected]

Abstract

In this paper, a high selectivity wideband 180° phase shifter (PS) with the functionality of vertical transition is presented. The whole circuit is realized based on the hybrid microstrip/slotline (SL) structure. By introducing the short-circuited microstrip stepped-impedance resonators, two transmission zeros are created to improve the selectivity of the PS. With the SL in the center ground layer, a frequency independent 180° PS can be obtained. The even/odd-mode equivalent circuits of the proposed PS are analyzed to guide the design. Finally, a practical wideband 180° PS with high filtering selectivity is designed and fabricated to verify the design theory.

Type
Passive Components and Circuits
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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