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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2025-01-03
A Miniaturization Dual-Passband Microwave Filter Based on Load-Coupled Open Stub Lines
By
Xinying Sun,

    Dr. Xinying Sun

    Gannan Normal University

    China

    Homepage

Chuicai Rong,

    Dr. Chuicai Rong

    Gannan Normal University

    China

    Homepage

Huajie Gao,

    Dr. Huajie Gao

    Gannan Normal University

    China

    Homepage

Menglu Zhang

    Dr. Menglu Zhang

    Gannan Normal University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 124, 17-21, 2025
doi:10.2528/PIERL24103001 | Google Scholar

Abstract
In this Letter, a miniaturized U-shaped microstrip filter based on a load-coupled open line is proposed. It is composed of a step impedance resonator and parallel coupled open stub line. Interfinger feed is used to enhance coupling. This configuration and coupled open stub lines form four transmission zeros between two passbands as part of open coupled stub lines to increased out-of-band rejection. The analysis of formation reason of transmission zero is conducted using lossless transmission line theory and even-odd mode analysis techniques. A filter operating at 2.53 GHz and 5.53 GHz is simulated and fabricated. The insertion loss of first passband is 1.30 dB, and return loss is -18.60 dB. The insertion loss of the second passband is 0.70 dB, and return loss is 22.89 dB. The out-of-band rejection is maintained below -20.00 dB. The final model size is 0.20λg x 0.23λg. The final physical measurement results confirm theoretical results.
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Citation
Xinying Sun, Chuicai Rong, Huajie Gao, and Menglu Zhang, "A Miniaturization Dual-Passband Microwave Filter Based on Load-Coupled Open Stub Lines," Progress In Electromagnetics Research Letters, Vol. 124, 17-21, 2025.
doi:10.2528/PIERL24103001
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