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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2024-01-15
Realization of a Second-Order Wide-Stopband Substrate-Integrated Waveguide Filter Using the Weakest Electric Field Method and DGS Structure
By
Yuxin Fang,

    Dr. Yuxin Fang

    School of Mathematics and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Xiaohei Yan,

    Prof. Xiaohei Yan

    School of Mathematics and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Yixian Wang,

    Dr. Yixian Wang

    School of Mathematics and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Shengbing Zhang

    Dr. Shengbing Zhang

    School of Mathematics and Electronic Information Engineering

    Guangxi Minzu Normal University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 116, 87-94, 2024
doi:10.2528/PIERL23112202 | Google Scholar

Abstract
To increase the stopband width of the filter, a second-order wide-stopband substrate-integrated waveguide filter is suggested. This filter is designed by utilizing a DGS structure and the weakest electric field approach. To suppress the modes, the filter sets the inner and outer coupling windows at the modes' weakest electric fields (TE120/TE210, TE220). Additionally, a new nested U-shaped DGS structure is implemented to suppress the TE130 mode, hence expanding the stopband width of the filter. The filter has been processed and measured, and the findings indicate a 4.5 GHz center frequency, a -3 dB bandwidth of 240 MHz, a relative bandwidth of 5.3%, an insertion loss of -1.2 dB in the passband, and a -22 dB stopband, which can be extended up to 9.4 GHz (i.e., 2.1 times the center frequency). The simulated and measured results demonstrate good alignment. Compared to other SIW filters, the current filter achieves a wider stopband while using fewer orders and implementing a straightforward design method, providing potential value for applications.
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Citation
Yuxin Fang, Xiaohei Yan, Yixian Wang, and Shengbing Zhang, "Realization of a Second-Order Wide-Stopband Substrate-Integrated Waveguide Filter Using the Weakest Electric Field Method and DGS Structure," Progress In Electromagnetics Research Letters, Vol. 116, 87-94, 2024.
doi:10.2528/PIERL23112202
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