Design of wideband filtering phase shifters with wide stopband

Meng Liu; Lei Chen; Jin Yi Liu; Huan Xue

doi:10.1515/freq-2024-0328

Article

Design of wideband filtering phase shifters with wide stopband

Meng Liu , Lei Chen , Jin Yi Liu and Huan Xue

Published/Copyright: May 30, 2025

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From the journal Frequenz Volume 79 Issue 9-10

Abstract

This letter presents a class of wideband filtering phase shifters using end coupled short-circuit resonators (ECSCRs). By employing parallel coupled line, transmission zero (TZ) can be introduced. The proposed ones have some advantages such as intrinsic wideband characteristic, steep filtering property, wide stopband bandwidth, and low phase deviation in phase shift. The synthesis method for designing the proposed wideband filtering phase shifters with a prescribed phase shift value and bandwidth is presented. To verify the design method, 45° and 90° wideband filtering phase shifters are designed, fabricated, and measured. Good performances are achieved with small insertion loss and low phase deviation of ± 2.2° over bandwidth of 56.64 %, and 62.69 %, respectively.

Keywords: end coupled short-circuit resonators (ECSCRs); low phase deviation; wideband filtering phase shifters; wide stopband bandwidth

Corresponding author: Lei Chen, School of Electronic and Information Engineering, Xi’an Technological University, Xi’an, 710021, P.R. China, E-mail: sumter1108@163.com

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Use of Large Language Models, AI and Machine Learning Tools: None declared.
Conflict of interest: The authors state no conflict of interest.
Research funding: None declared.
Data availability: Not applicable.

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Published Online: 2025-05-30

Published in Print: 2025-10-27

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https://doi.org/10.1515/freq-2024-0328

Keywords for this article

end coupled short-circuit resonators (ECSCRs); low phase deviation; wideband filtering phase shifters; wide stopband bandwidth