Triple Split Ring Resonators Metamaterial for Frequency Agility

A metamaterial with frequency reconfigurability over a wide range of frequencies is presented in this paper. The proposed unit-cell has a circular geometrical shape with a triple split-ring resonator (SRR) and stepped-impedance resonator (SIR) technique applied to provide better miniaturization factor. The operating frequency is controlled by the presence/absence of a perfect conductor switches. Employing nine switches, the frequency is controlled over the range (1-7) GHz providing a various range of resonance frequencies, frequency bands, and different bandwidths. The suggested metamaterial is simulated using Ansys Electronics Desktop simulator (HFSS), and MATLAB software is used to analyze the characteristics of the unit-cell in terms of permittivity, permeability, and the refractive index. The reflection and transmission coefficients are extracted to observe the behavior of the metamaterial. The results show a negative near-zero refractive index at a certain frequency range. The permeability and permittivity curves exhibit a single negative (SNG) and a double negative (DNG) operating region.