EIT-Like Effect in Metamaterials based on Two-Layer Arrays for High-Gain Antennas

In this paper we present the comparative study of an electromagnetically induced transparent (EIT) effect in a two-layer metamaterial (MM) for a high-gain planar antenna application. The proposed mechanism of a low-profile EIT-like MM is based on an identical resonant square ring arrays in a sandwich structure with a small dielectric thickness. The EIT-like effect was observed connected with a resonance condition in a narrow transmission window due to the near-field coupling of the identical ring resonators behaved as a unit-cell element in periodic arrangement. The simulation study shows that the property of electric conductivity in a perfect electric conductor (PEC) and copper influences on a resonant transmission peak. The EIT-like MM was utilized for a high-gain directive planar antenna design by applying a blank conductor surface at a planar line symmetry acting as an electromagnetic mirror. The narrow aperture fed by short-end coplanar waveguide (CPW) feed-line was incorporated into a conductor surface as a driven radiator. The EIT-like MM antenna can be operated close to the targeted resonant frequency of the EIT-like MM (~10 GHz). The proposed planar antenna provides a thickness of λ/60 (0.5 mm). The simulation of the proposed planar antenna design was performed and it reports the antenna gain of 14.45 dBi and 13.32 dBi in cases of using the PEC- and copper-based square ring resonator array respectively. The antenna-gain difference is due to the ohmic-loss absorption regarding to electric conductivity.