Varactor-loaded split ring resonators for tunable notch filters at microwave frequencies
- 1 January 2004
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 40 (21), 1347-1348
- https://doi.org/10.1049/el:20046389
Abstract
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.Keywords
This publication has 4 references indexed in Scilit:
- Miniaturized coplanar waveguide stop band filters based on multiple tuned split ring resonatorsIEEE Microwave and Wireless Components Letters, 2003
- Comparative analysis of edge- and broadside-coupled split ring resonators for metamaterial design - Theory and experimentsIEEE Transactions on Antennas and Propagation, 2003
- Composite Medium with Simultaneously Negative Permeability and PermittivityPhysical Review Letters, 2000
- Magnetism from conductors and enhanced nonlinear phenomenaIEEE Transactions on Microwave Theory and Techniques, 1999