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A tunable balanced phase shifter with wide operating bandwidth

Published online by Cambridge University Press:  03 November 2023

Wei Zhang Open the ORCID record for Wei Zhang [Opens in a new window] ,
Binghe Wang ,
Bin Wang ,
Jin Shi Open the ORCID record for Jin Shi [Opens in a new window]  and
Kai Xu Open the ORCID record for Kai Xu [Opens in a new window]
Wei Zhang
Affiliation:
School of Information Science and Technology, Nantong University, Nantong, China Research Center for Intelligent Information Technology, Nantong University, Nantong, China Nantong Key Laboratory of Advanced Microwave Technology, Nantong University, Nantong, China
Binghe Wang
Affiliation:
School of Information Science and Technology, Nantong University, Nantong, China
Bin Wang
Affiliation:
School of Information Science and Technology, Nantong University, Nantong, China R&D Department, Zhongtian Radio Frequency Cable Co., Ltd., Nantong, China
Jin Shi*
Affiliation:
School of Information Science and Technology, Nantong University, Nantong, China Research Center for Intelligent Information Technology, Nantong University, Nantong, China Nantong Key Laboratory of Advanced Microwave Technology, Nantong University, Nantong, China
Kai Xu
Affiliation:
School of Information Science and Technology, Nantong University, Nantong, China Research Center for Intelligent Information Technology, Nantong University, Nantong, China Nantong Key Laboratory of Advanced Microwave Technology, Nantong University, Nantong, China
*
Corresponding author: Jin Shi; Email: jinshi0601@hotmail.com
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Abstract

A wideband tunable balanced phase shifter is achieved by utilizing varactor-loaded coupled lines (VLCLs)-embedded multistage branch-line structure. The tunable phase shift with low in-band phase deviation is attributed to the regulation in phase shift of the VLCLs and the horizontal microstrip lines in series. The wideband differential-mode (DM) impedance matching and common-mode (CM) suppression are due to multiple DM transmission poles and CM transmission zeros, which are brought about by the cascade of VLCLs and a microstrip line with short-circuited stubs in the DM-equivalent circuit and open-circuited stubs in the CM-equivalent circuit, respectively. Compared with the state-of-the-art tunable balanced phase shifters, the proposed design not only has the advantages of wide operating bandwidth (BW) with low in-band phase deviation but also has low insertion loss and easily fabricated structure. Theoretical analysis and design procedure were conducted, resulting in a prototype covering the frequency of 1.8 GHz. This prototype offers a tunable phase shift capability ranging from 0° to 90°. The prototype exhibits an operating BW of 45%, with a maximum phase deviation of ±6°. It also achieves a 10 dB DM return loss and CM suppression, while maintaining a maximum insertion loss of 2.5 dB.

Keywords

balanced phase shiftercommon-mode suppressionEM field theoryeven-odd-mode analysislow in-band phase deviationpassive components and circuitstunable phase shiftervaractor-loaded coupled linesvoltage-controlwide bandwidth
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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