Artificial surface with asymmetric reflection properties

An artificial surface with asymmetric reflection properties is presented. By covering a metal ground plane with periodic metal-dielectric composite textures, the electromagnetic reflection properties can be altered. By tuning the individual lattice of a periodic mushroom-type texture to vary the surface impedance, a surface with graded reflection phases as a function of position can be designed. Applying a linear gradient in the reflection coefficient phase along the face, the proposed surface is electromagnetically inclined, even though physically flat. For the whole ranges of the incident angle, this metasurface reveals asymmetric reflection properties contrary to the law of reflection. The reflection patterns from the surface, the boundary condition, and the relation between the incident angle and the reflection angle are presented.