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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2026-08-20
Design and Implementation of a Triple-Band Bandstop Filter with Controllable Bandwidth and Stopband Rejection
By
Chuan Shao,

    Dr. Chuan Shao

    Jiangsu College of Engineering and Technology

    China

    Homepage

Xin Gao,

    Dr. Xin Gao

    Shanghai Institute of Satellite Engineering

    China

    Homepage

Baotong Gou,

    Dr. Baotong Gou

    Jiangsu College of Engineering and Technology

    China

    Homepage

Rong Cai,

    Dr. Rong Cai

    Jiangsu College of Engineering and Technology

    China

    Homepage

Xinnai Zhang,

    Dr. Xinnai Zhang

    Jiangsu College of Engineering and Technology

    China

    Homepage

Kai Xu

    Dr. Kai Xu

    Nantong University

    China

    Homepage

Progress In Electromagnetics Research C, Vol. 172, 416-421, 2026
doi:10.2528/PIERC26062301 | Google Scholar

Abstract
In this article, a triple-band bandstop filter employing coupled tri-section stepped-impedance resonators is proposed. The characteristic impedances of individual stepped-impedance sections are judiciously adjusted to independently allocate the three stopband frequencies. Subsequently, the coupling coefficients between adjacent resonators are meticulously tuned to simultaneously regulate the bandwidth of each stopband and the corresponding suppression level within the rejection bands. Moreover, out-of-band insertion and return losses are optimized by properly selecting the characteristic impedance of half-wavelength transmission lines interconnecting resonators. To experimentally validate the aforementioned design methodology, a triple-band bandstop filter with stopband center frequencies of 1.2 GHz, 3 GHz, and 4.8 GHz is designed, simulated, fabricated, and measured. The measured responses are found in excellent agreement with simulated results, thereby conclusively substantiating the proposed design concept.
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Citation
Chuan Shao, Xin Gao, Baotong Gou, Rong Cai, Xinnai Zhang, and Kai Xu, "Design and Implementation of a Triple-Band Bandstop Filter with Controllable Bandwidth and Stopband Rejection," Progress In Electromagnetics Research C, Vol. 172, 416-421, 2026.
doi:10.2528/PIERC26062301
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