Journal
ELECTRONICS LETTERS
Volume 40, Issue 21, Pages 1347-1348Publisher
IEE-INST ELEC ENG
DOI: 10.1049/el:20046389
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It is demonstrated that the resonant frequency of split ring resonators (SRRs) can be tuned using varactor diodes. The resulting particle, which is called a varactor-loaded split ring resonator (VLSRR), is applied to the design of a tunable notch filter at S-band. The device consists on a microstrip transmission line with VLSRRs placed at both sides of the conductor strip. Owing to the proximity of the particles to the line the rings are excited and a transmission notch arises. It is shown that simply using two VLSRRs pairs, rejection levels above 20 dB are achieved in a 0.5 GHz timing interval centred at 2.85 GHz. The proposed device is the first tunable notch filter based on SRRs.
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