Planar Metasurface for Reconfigurable Reflector Antennas

A planar active metasurface composed of meta-atoms incorporating voltage-controlled varactor diodes, is used as reflector for antenna applications. The dispersion responses of the cells are individually tailored for reconfigurability mechanisms. The phase characteristics of two reflectors are engineered by judiciously controlling the bias voltage of the varactor diodes on the planar metasurface. The metasurface is illuminated by a primary source to be used as parabolic and corner reflectors. Measurements are performed on a fabricated prototype to validate the concept. Beam steering performances are also demonstrated in the case of the parabolic-profile reflector.