Design of Dual Polarized Retrodirective Metasurfaces

Abstract

In this paper, we introduce the design of retrodirective metasurfaces following the generalized phase law of reflection for dual polarizations TM and TE at a given incident angle at 14.7GHz. Two different unit cells (patch and cross) structures have been proposed in the design approach having two and three degrees of freedom respectively. The periodicity of the super-cell design has been given at $\mathbf{5.76}\lambda$ in order to redirect an incoming wave back in the same direction of incidence at 5°. To highlight on the applicative potential of metasurfaces for radar cross section enhancement at oblique incident angles, the monostatic RCS for a cross structured metasurface has been calculated showing a high level of retrodirectivity at the desired angle for TM and TE polarizations.