Reflective and Transmissive Near-Zero Metasurface in Gain Enhancement

Abstract

This paper proposes an analysis of a reflective and transmissive metasurface in the gain enhancement of a microstrip patch antenna. A patch antenna working at 2.4 GHz is considered for which a maximum gain enhancement of 3.4 dB is achieved. The real and imaginary values of refractive index of the unit cell is extracted, which shows a near zero for both cases, which enables the gain enhancement in the particular frequency. The distance between the patch antenna and the superstrate is 10 mm (0.08 λ). The metasurface consists of a 4 × 4 unit cell array. The paper also gives a clear analysis of the difference between reflective and non-reflective metasurfaces and the impact of the increase in the number of unit cells used in the metasurface. All the analysis is carried out using Ansys HFSS software.