Title :
On the Radiation Properties of Split-Ring Resonators (SRRs) at the Second Resonance
Author :
Zuffanelli, Simone ; Zamora, Gerard ; Aguila, Pau ; Paredes, Ferran ; Martin, Ferran ; Bonache, Jordi
Author_Institution :
Dept. d´Eng. Electron., Univ. Autonoma de Barcelona, Bellaterra, Spain
Abstract :
The radiation properties of split-ring resonators (SRRs) at their second resonance frequency are studied for the first time in this work. In particular, the electric and magnetic dipole moments of the edge-coupled SRR are calculated analytically under the assumption of strong coupling between the internal and external rings. Based on these results, the radiation resistance and the radiation efficiency are obtained theoretically. Electromagnetic simulations of the structure reveal that there is very good agreement with the theoretical predictions, pointing out the validity of the proposed analysis. As a proof of concept, an SRR antenna prototype is designed and fabricated. Experimental data are in good agreement with the theoretical and simulated results, and demonstrate the validity of the SRR working at its second resonance frequency as a radiating element.
Keywords :
antenna radiation patterns; dipole antennas; resonators; SRR; SRR antenna prototype; edge coupled SRR; electric dipole moments; electromagnetic simulations; magnetic dipole moments; radiation efficiency; radiation properties; radiation resistance; second resonance frequency; split ring resonators; Antennas; Approximation methods; Magnetic moments; Magnetic resonance; Resistance; Substrates; Metamaterials; planar antennas; radiation efficiency; split-ring resonators (SRRs);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2015.2432762