Millimeter wave thin metasurface enabling polarization-controlled beam shaping

This paper presents a novel Metasurface exhibiting different beam shaping characteristics according to the polarization of incident waves. The Metasurface is composed of numerous unit cells operating as a spatial phase filter providing different phase shifts depending to the incident polarization. Metallic patterns constituting the unit cell are designed to have different geometry along the two dimensional direction utilizing the proposed design methodologies. It is demonstrated that this structure can have different reactance value depending on the polarized direction of the incident waves. The proposed Metasurface is designed by arranging combinations of the unit cells having passband characteristic but different phase variations as a function of the incident polarization at 28 GHz. Finally, it is demonstrated that for x-polarized waves the proposed Metasurface operates as a convex lens achieving 13 dB gain enhancement while for y-polarized waves the Metasurface operates as frequency selective surface (FSS) just providing passband property without any gain enhancement.