Dual-band asymmetric transmission of both linearly and circularly polarized waves based on chiral meta-surface

In this paper, a chiral metamaterial structure composed of a half-gammadion and H-shape is proposed, which can realize simultaneously dual-band asymmetric transmission (AT) of both linearly and circularly polarized waves in the microwave band. Numerical simulations show that the maximum AT of linearly and circularly polarized waves can reach 0.45 and 0.36 at the resonance frequency, respectively. Specifically, compared with the previous structures, the AT amplitude of the circularly polarized wave is enhanced further. Furthermore, the physical mechanism of polarization conversion of the linearly polarized wave is analyzed by the electric field distributions and the hybridized plasmon coupling modes of the circularly polarized wave are also analyzed based on the currents densities in top and bottom metallic layers in detail. The simulated results are in good agreement with the experimental and theoretical ones for the linearly and circularly polarized waves, respectively.