A compact switchable bandstop filter with dual-band and wideband bandstop functions

Hang Mei, Xiaoying Zuo, Mengxin He and Yajian Li

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 5, 594-606

Abstract: In this article, a three-state switchable bandstop filter is proposed, which integrates narrowband dual-band bandstop filter (DBSF), tunable DBSF, and wideband bandstop filter (WBSF) into a topology structure through conducting or disconnecting two p-i-n diodes. Adjusting the capacitance value can change the transmission zero (TZ) and achieve tunable stopband bandwidth. The proposed three-state switchable bandstop filters are simulated and measured. Narrowband DBSF has a 30 dB stopband rejection (SR), tunable DBSF has 6 stopband TZs, tunable stopband bandwidth, and WBSF has a relative bandwidth (RB) of 118.1%. Simulation and measurement results are in good agreement. This switchable bandstop filter meets the requirements of compact RF front-end structure and functional integration.

Date: 2025
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DOI: 10.1080/09205071.2025.2465498

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