Broadband Metamaterial Reflectors for Polarization Manipulation based on Cross/Ring Resonators

We presented the investigation of broadband metamaterial reflector for polarization manipulation based on cross/ring resonators. It is demonstrated that the meta material reflector can convert the linearly polarized incident wave to its cross polarized wave or circularly polarized wave. Due to the multiple resonances at neighboring frequencies, the proposed reflector presents broadband property and high efficiency. The measured fraction bandwidth of cross polarization conversion is 55.5% with efficiency higher than 80%. Furthermore, a broadband circular polarizer is designed by adjusting the dimension parameters and the measured fraction bandwidth exceeds 30%.