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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2021-03-29
Compact Quarter Mode and Eighth Mode Substrate Integrated Waveguide Bandpass Filters with Frequency-Dependent Coupling
By
Zhiwei Shi,

    Dr. Zhiwei Shi

    School of Communication & Information Engineering

    Shanghai University

    China

    Homepage

Guohui Li,

    Dr. Guohui Li

    Shanghai University

    China

    Homepage

Yulu Song,

    Dr. Yulu Song

    Shanghai University

    China

    Homepage

Binbin Cheng

    Dr. Binbin Cheng

    Shanghai University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 97, 51-59, 2021
doi:10.2528/PIERL21012201 | Google Scholar

Abstract
This paper presents two size-miniaturized quarter mode (QM) and eighth mode (EM) substrate integrated waveguide (SIW) bandpass filters (BPFs), which are embedded with a novel frequency-dependent coupling (FDC) structure. The proposed FDC is implemented as a composition of balanced folding lines and inductive iris. One additional transmission zero (TZ) introduced by FDC between two cavities leads to higher frequency selectivity and better out-of-band rejection. Higher order modes suppression appears by combining the loaded paired open stubs on feeder lines with FDC technique, achieving a wide stopband. Meanwhile, the circuit dimension is further reduced by symmetrically cutting SIW. To validate the novel approach, the frequency-dependent coupling matrix (CM) is implemented to determine characteristics of the proposed structure in theory, QM- and EM-SIW BPFs loaded with FDC have been designed, fabricated and measured. Experimental results illustrate the characteristics of miniaturization and good performance. All results are in good agreement.
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Citation
Zhiwei Shi, Guohui Li, Yulu Song, and Binbin Cheng, "Compact Quarter Mode and Eighth Mode Substrate Integrated Waveguide Bandpass Filters with Frequency-Dependent Coupling," Progress In Electromagnetics Research Letters, Vol. 97, 51-59, 2021.
doi:10.2528/PIERL21012201
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