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Compact eight-channel diplexer based on quad-mode stepped impedance resonator

Published online by Cambridge University Press:  30 January 2025

Kaijun Song ,
Lele Fang Open the ORCID record for Lele Fang [Opens in a new window] ,
Qian Li Open the ORCID record for Qian Li [Opens in a new window]  and
Yong Fan
Kaijun Song*
Affiliation:
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China.
Lele Fang
Affiliation:
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China.
Qian Li
Affiliation:
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China.
Yong Fan
Affiliation:
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China.
*
Corresponding author: Kaijun Song; Email: ksong@uestc.edu.cn
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Abstract

A compact microstrip eight-channel diplexer based on quad-mode stepped impedance resonator (QMSIR) is proposed in this paper. The proposed diplexer is composed by two second-order quad-band bandpass filters (BPFs) and common-port distributed coupling matching circuit. Each quad-band BPF is formed by two coupled-QMSIRs controlling the passband characteristics. By introducing multiple coupling paths between input and output ports, the isolation between the eight channels is performed. For demonstration, an eight-channel diplexer based on QMSIR is designed and fabricated with microstrip technology. The use of the QMSIR can lead to significant size reduction for the multiplexer, this is because the required resonator number is reduced. As a result, the diplexer occupies a compact size of 0.083λ2, which is smaller than most of the eight-channel diplexers that have been proposed. And the 3 dB fractional bandwidth is 97% (2.5–7.2 GHz). Measurement results correlate well with the simulated predictions, showing that a good isolation of better than 20 dB and upper stopband of better than 10 dB.

Keywords

bandpass filtercompacteight-channel diplexerquad-mode stepped impedance resonator (QMSIR)
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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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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