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2026-10-28
A Novelty Quad-Channel Diplexer Based on Microstrip Loop-Type Resonators Loaded with Shorted Stubs
By
Jun-Mei Yan,

    Dr. Jun-Mei Yan

    School of Mechanical and Electronic Engineering

    Jingdezhen Ceramic University

    China

    Homepage

Hong Jiang

    Dr. Hong Jiang

    School of Mechanical and Electronic Engineering

    Jingdezhen Ceramic University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 132, 36-42, 2026
DOI:10.2528/PIERL26080102 | Google Scholar

Abstract
loop-type resonators form four signal channels, with each resonator generating two channels. The microstrip loop-type resonator is loaded with four shorted stubs and supports four resonant modes. Because three of these four resonant frequencies can be independently tuned, the diplexer's signal channel center frequencies can be freely adjusted within a certain range. External coupling is achieved using parallel-coupled microstrip lines, which eliminates the need for additional impedance-matching circuits. Furthermore, the subsequent analysis indicates that the coupling strength between the port and the four resonant modes can be tuned in a certain range. This provides a certain degree of freedom for tailoring the filtering performance of each signal channel. This structure introduces source-load coupling, which can generate transmission zeros and improve the frequency selectivity of the signal channels. The mechanism analysis and design methodology of the proposed diplexer are presented. A prototype diplexer was fabricated and tested. The measured results agreed well with the simulated results, verifying the effectiveness of the proposed structure.
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Citation
Jun-Mei Yan, and Hong Jiang, "A Novelty Quad-Channel Diplexer Based on Microstrip Loop-Type Resonators Loaded with Shorted Stubs," Progress In Electromagnetics Research Letters, Vol. 132, 36-42, 2026.
DOI:10.2528/PIERL26080102
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