A Polarization Conversion Metasurface with Bidirectional Characteristics

In this paper, a linear to circular polarization metasurface converter with bidirectional scattering is presented. When a linearly polarized wave impinges on the metasurface, it is converted into a left-handed circularly polarized wave with half reflection and half transmission. A sandwich structure unit cell operating at 3.65 GHz is design to realize the bidirectional scattering function, which consists of a pair of square patches with two circular holes on the top and bottom layers, a middle ground layer and two metal vias connecting the top and bottom layers. The proposed metasurface is demonstrated by principle analysis and full-wave simulation.