Near-Zero Index Split Ring Resonator: A Lens Antenna

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In this study, a matematerial structure, which consists of rectangular split ring resonator arrays, is investigated numerically and experimentally in the frequency range from 1 GHz to 5GHz.FR-4 material is used as the substrate material due to its low cost.During the numerical analysis (simulation analysis), a parametric study is performed to determine the optimal dimension of the unit cell structure.S11 (reflection coefficient), S21 (transmission coefficient), and n (refractive index) are examined in the frequency range of interest.As a result of the parametric study, the value of n is obtained as approximately zero.By increasing the split ring width, nearzero index is observed at higher frequencies.Hence, it is also deduced that the metamaterial structure behaves as a super lens antenna at the related frequency.Numerical analysis is performed via CST Microwave Studio (MWS).The simulation results are confirmed with experimental results obtained by network analyzer.