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Wideband quasi-reflectionless bandstop filters using open/shorted coupled lines

Published online by Cambridge University Press:  06 June 2023

Yijun Weng Open the ORCID record for Yijun Weng [Opens in a new window] ,
Wenjie Feng Open the ORCID record for Wenjie Feng [Opens in a new window] ,
Sha Xu Open the ORCID record for Sha Xu [Opens in a new window] ,
Gaungxu Shen Open the ORCID record for Gaungxu Shen [Opens in a new window] ,
Yongrong Shi Open the ORCID record for Yongrong Shi [Opens in a new window]  and
Wenquan Che Open the ORCID record for Wenquan Che [Opens in a new window]
Yijun Weng
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
Sha Xu*
Affiliation:
School of Integrated Circuits, Guangdong University of Technology, Guangzhou, China
Gaungxu Shen
Affiliation:
College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
Yongrong Shi
Affiliation:
Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Wenquan Che
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; Sha Xu; sally.xu@gdut.edu.cn
Corresponding author: Wenjie Feng; Email: fengwenjie1985@163.com; Sha Xu; sally.xu@gdut.edu.cn
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Abstract

Two wideband bandstop filters (BSFs) for single and dual-band are proposed and then extended to reflectionless BSFs based on the analysis from input impedance/admittance perspective. Also, topologies of higher-number-stopband input-reflectionless BSF are provided to broaden the design scope. Open/shorted coupled lines are adopted to obtain multi transmission zeros and desired stopband bandwidth by adjusting the even-/odd-mode impedance of coupled lines. Resistor-loaded coupled lines are connected with Port 1 to absorb unwanted signals and obtain input-reflectionless behavior. For validation of the proposed theory analysis, BSFs with corresponding absorptive prototypes are constructed and measured.

Keywords

bandstop filterdual-bandmicrostrip circuitswideband
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Special Issue 10: JNM 2022 Special Issue , December 2023 , pp. 1698 - 1706
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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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