Scalar metasurface antennas with tilted beam

The paper deals with the design of scalar metasurface antennas pointing to a predefined tilted direction. The equivalent electric current over the metasurface is used to derive design equations for the generation of a desired far field pattern based on the scalar impedance condition associated to the metasurface. In particular, it is shown that scalar metasurfaces can be used to generate linear and circular polarizations for a fixed pointing direction by properly changing locally the scalar impedance boundary condition. Two solutions are presented at 20 GHz, one for each polarization. Full-wave results validate the proposed approach.