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Compact multimode-resonator multiplexer with wide upper-stopband and high isolation

Published online by Cambridge University Press:  30 September 2020

Kaijun Song ,
Mou Luo Open the ORCID record for Mou Luo [Opens in a new window] ,
Cuilin Zhong ,
Yuxuan Chen ,
Yedi Zhou  and
Fei Xia Open the ORCID record for Fei Xia [Opens in a new window]
Kaijun Song
Affiliation:
HF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu611731, China
Mou Luo
Affiliation:
HF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu611731, China
Cuilin Zhong*
Affiliation:
Shen Zhen City Jiang Bo Chuang Xing Electronic Co. Ltd., Shen Zhen518000, China
Yuxuan Chen
Affiliation:
HF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu611731, China
Yedi Zhou
Affiliation:
HF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu611731, China
Fei Xia
Affiliation:
HF Key Laboratory of Science, University of Electronic Science and Technology of China, Chengdu611731, China
*
Author for correspondence: Cuilin Zhong, E-mail: [email protected]
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Abstract

A miniaturized high-isolation quadplexer with wide upper-stopband based on open and short stub-loaded multimode-resonator is proposed in this paper. Based on the theory of multimode-resonator and stepped impedance resonator (SIR), the compact quadplexer is designed by using multimode-resonator and SIR. In order to further miniaturize the size of the circuit, the multimode resonator is employed as the common resonator to replace the common matching network of the quadplexer and the SIRs are curved. Equivalent topology circuit is given to analyze and design the quadplexer. Detailed analyses are given according to the equivalent circuits. The proposed compact quadplexer working at central frequencies of 1.8, 2.4, 2.8, and 3.5 GHz with over 40 dB isolation is finally simulated, fabricated, and measured. The measured results agree well with the simulated ones. The total size of the fabricated quadplexer is 0.36 λg × 0.42 λg.

Keywords

High isolationminiaturizationmultimode resonatorquadplexer
Type
Passive Components and Circuits
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 2 , March 2021 , pp. 111 - 118
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with European Microwave Association

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