4.6 Article

Compact Tunable Broadband Filtering Attenuator Based on Variable Resistors

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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWT.2023.3263295

关键词

Attenuators; Filtering; Resistors; Attenuation; Broadband communication; Microwave filters; Wireless communication; Broadband; coupled-line structures; filtering attenuator; Index Terms

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This letter proposes a compact microstrip broadband filtering attenuator based on variable resistors with high-frequency selectivity. It can achieve tunable attenuation characteristics over a broad frequency band by changing the resistance of the variable resistors. The circuit structure is analyzed using odd- and even-mode methods. A fabricated prototype of the filtering attenuator operates from 1.3 to 2.8 GHz and realizes tunable attenuation from 3.26 to 15.61 dB. The results of theoretical calculations, simulations, and measurements agree well, validating the feasibility of the proposed design.
In this letter, a compact microstrip broadband filtering attenuator based on variable resistors is proposed with high-frequency selectivity. It can achieve tunable attenuation characteristics over a broad frequency band by changing the resistance of the variable resistors. Due to the symmetry of the circuit structure, it is analyzed using odd- and even-mode methods. For demonstration, a filtering attenuator prototype is fabricated and measured, which operates from 1.3 to 2.8 GHz and realizes tunable attenuation from 3.26 to 15.61 dB. The results of theoretical calculations, simulations, and measurements agree well with each other, which validates the feasibility of the proposed design.

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