An ultra-thin wide-angle cross polarization conversion metasurface with enhanced bandwidth

In this article, a bandwidth-enhanced metasurface has been designed using single circular split ring as unit cell on the top surface of a metal backed FR4 substrate. The structure behaves as cross polarization conversion (CPC) metasurface over full width at half maxima (FWHM) bandwidth of 12.94 GHz ranging from 9.44 GHz to 22.38 GHz. The proposed CPC metasurface maintains bandwidth enhancement upto 45° incident angles under both TE and TM polarizations. The structure is ultra-thin (~ λ/11.4 with respect to the centre frequency) in nature.