2023
DOI: 10.1371/journal.pone.0290979
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A new tunable bandstop filter square-ring resonator using varactor diodes

José Garibaldi Duarte Júnior,
Valdemir Praxedes da Silva Neto,
Adaildo Gomes d’Assunção

Abstract: This work presents the development of a bandstop filter with a tunable response. Varactor diodes are used as control elements. Studies and investigations demonstrate the influence of the variable capacitance on the input admittance and on the S-parameters frequency responses of the proposed square-ring resonator geometry. The design of the square-ring resonator is based on mathematical modeling of ideal transmission lines, considering parameters of characteristic admittance and electrical length for odd and ev… Show more

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