Anisotropic reflective metasurfaces for manipulating radiation beams in reflection

We propose a kind of anisotropic metasurface, which is composed of orthogonal I-shaped structures and a grounded plane spaced by a dielectric substrate. The metasurface has capacity to manipulate the radiating characteristics of x- and y-polarized waves independently in reflection by changing the dimensions of each I-shaped structure. By designing homogeneous anisotropic metasurface, the linear-polarized incident plane waves can be converted to circular polarized reflected waves in a broad frequency band. By designing inhomogeneous anisotropic metasurface, the x- and y-polarized incident plane waves can be separated and radiated to two different directions. Moreover, the anisotropic metasurfaces also have some applications in reflector antenna by using a horn antenna as a feed, and the incident quasi-spherical waves generated by the feed can be manipulated to plane waves after reflected by the metasurface, whose polarizations, directions and number of beams of the reflected plane waves also can be controlled as desired.