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In this paper, a half-mode substrate integrated waveguide (HMSIW) based equilateral triangular antenna is initially designed to operate at 6.5 GHz wireless frequency. This parent antenna is fitted with metallic vias all along two of its sides to make them perfect electrical conductor (PEC) walls while radiation taking place from the other side acts as perfect magnetic conductor (PMC) wall being devoid of such metallic vias. The antenna exhibits a gain of 5.5 dBi at the fundamental TE101 mode with linear polarization. Its gain is augmented using polarization independent coupled-resonator spatial filter (CRSF) frequency selective surface (FSS) as superstrate and is found to increase to 8.7 dBi at the same 6.5 GHz resonating frequency. The antenna prototype along with the FSS structure are both fabricated using Arlon AD270 substrate and experimental measurements are carried out. It is observed that both simulated and measured results are in close agreement with each other.

Gain Augmentation of a HMSIW based Equilateral Triangular Antenna using CRSF FSS Superstrate