Metasurface assisted wideband multifunctional polarizer

A wideband reflective type metasurface with both functionality cross and circular polarization conversions at different frequencies is presented in this paper. The meta-atom of the designed metasurface consists of six L-shaped metallic patches. A patching arrangement for the meta-atom yielded both polarization conversion ratio (PCR) > 0.9 over the 10.3–15.26 GHz band and axial ratio (AR) < 3 dB over the 8.97–9.75 GHz and 17.51–23.93 GHz bands. More than 30% fractional bandwidth is achieved for both functions. The physical mechanism of linear and circular polarization conversion has been analyzed by the spatial profile of electric and magnetic fields. The prototype of the designed metasurface consisting of $25×25$ meta-atoms is fabricated and experimental results are in reasonable agreement with the simulated results. The designed metasurface when integrated with antennas can be extensively applied for diverse microwave applications for polarization manipulation devices.