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Varactor-loaded split ring resonators for tunable notch filters at microwave frequencies

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6 Author(s)
Gil, I. ; Dept. d''Enginyeria Electron., Univ. Autonoma de Barcelona, Spain ; Garcia-Garcia, J. ; Bonache, J. ; Martin, F.
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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 tuning interval centred at 2.85 GHz. The proposed device is the first tunable notch filter based on SRRs.

Published in:

Electronics Letters  (Volume:40 ,  Issue: 21 )