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2024-02-17
A Miniaturized High-Selectivity Filter by Embedding Nested U-Shape Resonators in SIW
By
Xiaohei Yan,

    Prof. Xiaohei Yan

    School of Mathematics and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Wenjing Mu,

    Professor Wenjing Mu

    School of Mathematics, Physics, and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Minjie Guo,

    Mr. Minjie Guo

    School of Mathematics and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Xiumei Huang,

    Dr. Xiumei Huang

    School of Mathematics, Physics, and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Haiyan Zeng

    Dr. Haiyan Zeng

    School of Mathematics, Physics, and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 118, 15-20, 2024
doi:10.2528/PIERL24010403 | Google Scholar

Abstract
A substrate-integrated waveguide (SIW) miniaturization filter is proposed, which features high attenuation characteristics, effectively reduces filter loss and size, and improves frequency selectivity. The filter is miniaturized using the evanescent-mode theory and embeds a nested U-shaped resonator in the upper metal surface of the SIW. The proposed filter's equivalent circuit structure incorporates two LC parallel resonant loops with resistance characteristics that can, in turn, create two transmission zeros in the filter's stopband to enhance its selectivity. The filter has an effective size of only 0.39λg×0.23λg with a center frequency of 2.5 GHz. The -3 dB bandwidth measures 120 MHz, while the relative bandwidth is 4.8%. The insertion loss is -0.6 dB in the passband, and the return loss is more than 25 dB. Out-of-band rejection exceeds 40 dB in the range of 2.9~4.4 GHz. The measured and simulated results agree well. The filter offers benefits in terms of high rejection, miniaturization, and low insertion loss. It can be implemented in 5G (sub-6 GHz) wireless communication systems.
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Citation
Xiaohei Yan, Wenjing Mu, Minjie Guo, Xiumei Huang, and Haiyan Zeng, "A Miniaturized High-Selectivity Filter by Embedding Nested U-Shape Resonators in SIW," Progress In Electromagnetics Research Letters, Vol. 118, 15-20, 2024.
doi:10.2528/PIERL24010403
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