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A wideband bandpass filter with reconfigurable band traps based on voltage control system for S-band applications

Published online by Cambridge University Press:  08 September 2025

Mi Lin ,
Tong Zhou Open the ORCID record for Tong Zhou [Opens in a new window]  and
Guohua Liu
Mi Lin
Affiliation:
The School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, China
Tong Zhou
Affiliation:
The School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, China
Guohua Liu*
Affiliation:
The School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, China
*
Corresponding author: Guohua Liu; Email: ghliu@hdu.edu.cn
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Abstract

A bandpass filter with reconfigurable band traps operating in the S-band with a wide tuning range for the transmission zeros is presented in this article. The filter employs a main transmission line path comprising two different step impedance resonator structure, with stopband formation achieved through four quarter-wavelength resonators coupled to both ends of the main path. These resonators folded into open-ring to decrease the area of the circuit, are loaded with reconfigurable elements (SMV2020), controlled via a voltage-based control system. The voltage control system, which is designed by microcontroller unit (MCU)-AT32F421K8T7, can change the power supply voltage linearly to make this filter system flexible. The filter is fabricated on a Rogers 4350 substrate with a relative dielectric constant of 3.66, a loss tangent of 0.004, and a thickness of 0.762 mm and simulated in high-frequency structure simulator. The filter demonstrates favorable passband characteristics on either side of the stopband, achieving an in-band insertion loss of less than 1 dB and a return loss exceeding 12 dB. The reconfigurable stopband spans from 2.1 to 3.0 GHz, with a stopband return loss greater than 13 dB and an out-of-band rejection exceeding 50 dB.

Keywords

bandpass filtersmicrocontroller unitquarter-wavelength resonatorreconfigurableS-bandstep impedance

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 17 , Issue 6 , July 2025 , pp. 1019 - 1027
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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