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Broadband and compact folded substrate integrated waveguide phase shifter and its application to 180° directional coupler

Published online by Cambridge University Press:  08 August 2022

Fang Zhu Open the ORCID record for Fang Zhu [Opens in a new window] ,
Xin Zhao ,
Junhao Sheng  and
Guo Qing Luo
Fang Zhu
Affiliation:
Key Laboratory of RF Circuits and Systems of Ministry of Education, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
Xin Zhao
Affiliation:
Key Laboratory of RF Circuits and Systems of Ministry of Education, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
Junhao Sheng
Affiliation:
Key Laboratory of RF Circuits and Systems of Ministry of Education, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
Guo Qing Luo*
Affiliation:
Key Laboratory of RF Circuits and Systems of Ministry of Education, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
*
Author for correspondence: Guo Qing Luo, E-mail: luoguoqing@hdu.edu.cn
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Abstract

In this paper, a broadband, low insertion loss, and compact folded substrate integrated waveguide (FSIW) phase shifter is proposed for the first time. By loading the complementary split-ring resonators (CSRRs) on the middle metal layer of the FSIW, a closed-type slow-wave transmission line (TL) is obtained, which can provide a wideband phase shift (39%) compared with the equal-length fast-wave one. The enclosed structure of the CSRR-loaded FSIW prevents the CSRRs from radiation as suffered in the previous reported CSRR-loaded TLs, resulting in a low insertion loss. This feature greatly reduces the amplitude imbalance between the main line and the reference line of the phase shifter. In addition, no transition structure is required between the FSIWs with and without CSRRs for broadband impedance matching, which makes the phase shifter more compact and easier to integrate with other FSIW devices. To validate the performance of the proposed phase shifter and to illustrate its ease integration, a novel FSIW 180° directional coupler that consists of an FSIW 90° coupler and an FSIW 90° phase shifter is designed, fabricated, and measured. The measured results agree well with the simulated data.

Keywords

Broadbandcompactcomplementary split-ring resonators (CSRRs)Folded substrate integrated waveguide (FSIW)Phase shifter
Type
Passive Components and Circuits
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 4 , May 2023 , pp. 554 - 559
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Copyright
© The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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