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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2011-03-09
High Rejection Broadband BPF with Triple-Mode Stub-Loaded Resonator
By
Hong-Wei Deng,

    Dr. Hong-Wei Deng

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Bin Liu,

    Dr. Bin Liu

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Yong-Jiu Zhao,

    Dr. Yong-Jiu Zhao

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Xue-Shun Zhang,

    Dr. Xue-Shun Zhang

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Wen Chen

    Dr. Wen Chen

    College of Information Science and Technology

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 21, 139-146, 2011
doi:10.2528/PIERL11012410 | Google Scholar

Abstract
In this letter, a novel compact broadband and high rejection bandpass filter (BPF) with the source-load coupling is proposed using the triple-mode stub-loaded resonator. The resonator is formed by attaching one T-type open stub at the center plane and two identical short-circuited stubs symmetrical to high impedance microstrip line. It can generate one odd-mode resonant frequency fm2 and two even-mode fm1, fm3 in the desired band. The fm2 can be approximately determined by the high impedance microstrip line. The short-circuited stubs and T-type open stub can be applied not only to separately adjust the fm1 and fm3 while the two other ones keep relatively stationary, but also to separately create transmission zero near the lower and upper cut-off frequencies, leading to a high rejection skirt. As a result of the source-load coupling, two transmission zeros in the upper-stopband are generated to deepen and widen the upper-stopband. A high rejection BPF with the fractional bandwidth 76% is simulated, fabricated and measured. The measured results agree well with the EM simulations.
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Citation
Hong-Wei Deng, Bin Liu, Yong-Jiu Zhao, Xue-Shun Zhang, and Wen Chen, "High Rejection Broadband BPF with Triple-Mode Stub-Loaded Resonator," Progress In Electromagnetics Research Letters, Vol. 21, 139-146, 2011.
doi:10.2528/PIERL11012410
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