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Wideband balanced reflectionless filter with common-mode noise absorption

Published online by Cambridge University Press:  08 September 2025

Yijun Weng ,
Pei Qin  and
Wenjie Feng Open the ORCID record for Wenjie Feng [Opens in a new window]
Yijun Weng
Affiliation:
Guangdong Provincial Key Laboratory of Millimeter-Wave and Terahertz, South China University of Technology, Guangzhou, China
Pei Qin
Affiliation:
Guangdong Provincial Key Laboratory of Millimeter-Wave and Terahertz, South China University of Technology, Guangzhou, China
Wenjie Feng*
Affiliation:
Guangdong Provincial Key Laboratory of Millimeter-Wave and Terahertz, South China University of Technology, Guangzhou, China
*
Corresponding author: Wenjie Feng; Email: fengwenjie1985@163.com
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Abstract

This paper presents a wideband balanced reflectionless filter based on the half-wavelength ring resonator. The proposed structure is simple and easy for manufacture. The design procedures are elaborately introduced. To promote understanding, the analysis of differential-mode (DM) and common-mode (CM) equivalent circuits are given. The corresponding equations are derived. For validation, a design example is fabricated and tested. The measured results verify its ability of transmitting DM signals and eliminating undesired CM signals. Specifically, the 21.6-dB CM suppression bandwidth can reach up to 273%, while the CM absorption bandwidth can reach up to 195%. The proposed balanced reflectionless filter exhibits excellent DM matching level, CM suppression level, and wide reflectionless bandwidth.

Keywords

absorptivebalancedCommon-Mode (CM)differential-mode (DM)reflectionless

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 8
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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