Linear to circular polarization converter with third order meta-frequency selective surfaces

This paper introduces a novel ultra-thin linear to circular polarization converter based on third order meta-frequency selective surfaces (meta-FSS) operated at X band. The meta-FSS unit cell is composed of three metal layers and separated by two dielectric substrates with a thickness of λ/20. The transmission coefficients at two orthogonal directions are equal, while 90° transmission phase difference is introduced between them over a wide bandwidth. A horn antenna is employed as the linear source to verify the performance of the proposed structure. Simulated results show that the designed meta-FSS can effectively convert linear polarization (LP) wave to circular polarization (CP) wave in the frequency range of 9.3 GHz to 10.1 GHz.