Broadband cross-polarization conversion metasurface based on cross-shaped resonators

In this paper, a broadband polarization conversion metasurface in microwave regime based on cross-shaped resonators was proposed. The simulated results show that the converter can convert linear polarization wave into its cross-polarization wave, 2 dB bandwidth is 11.5–21.8 GHz, and the Polarization Conversion Ratio is greater than 96% in this range. The simulated surface current distributions show that there are three plasmon resonances generated by magnetic resonances and electric resonance, resulting in broadband cross-polarized reflections, and electromagnetic composite resonances in the same direction will inhibit cross-polarization reflection. The proposed converter presents polarization selectivity, which can only convert the y - and x -polarized waves completely. When the incident angles reach 40°, the converter also shows high-efficiency polarization conversion. The experimental results are highly consistent with the simulation ones. This work may have some potential application in polarization-controlled devices, stealth surfaces, antennas and etc.