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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2022-01-02
Bandpass Filter Design with Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure
By
Yun Xiu Wang,

    Dr. Yun Xiu Wang

    School of Physics and Electronic Information

    China West Normal University

    China

    Homepage

Wei Chao Yang,

    Dr. Wei Chao Yang

    School of Electronic and Information Engineering

    China West Normal University

    China

    Homepage

Min Jiang

    Dr. Min Jiang

    School of Electronic and Information Engineering

    China West Normal University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 102, 19-26, 2022
doi:10.2528/PIERL21110902 | Google Scholar

Abstract
Novel microstrip single-band and dual-band bandpass filters (BPFs) are presented in this paper. Firstly, a pair of open-ended stubs of less than λ/4 in length is connected to a uniform impedance resonator (UIR) at two symmetrical positions with respect to its centre, and at the same time other two open-circuited stubs with different lengths are loaded in the middle of the resonator. By virtue of parallel-coupling structure at I/O ports, a single-band BPF is constructed centered at 2.2 GHz with 10.6% 3-dB bandwidth, and two transmission zeros are implemented at the right side of the passband. Next, the L-shaped I/O coupled lines are applied to suppress the inherent spurious response of the stubs-loaded resonator. As a result, a dual-band BPF with two passbands at 2.2 GHz and 5.2 GHz, which is self-contained with three transmission zeros between the two passbands, is constituted. Finally, the proposed bandpass filters are designed and fabricated to provide an experimental validation for the predicted performances.
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Citation
Yun Xiu Wang, Wei Chao Yang, and Min Jiang, "Bandpass Filter Design with Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure," Progress In Electromagnetics Research Letters, Vol. 102, 19-26, 2022.
doi:10.2528/PIERL21110902
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