Ultrathin metasurface 12 GHz microwave parabolic reflector

This work demonstrates a thin, light-weight, low cost, and easily deployable flat metasurface reflector consisting of radially symmetric subwavelength sized resonators operating at 12 GHz. The resonators are designed using variable-sized patches with pre-defined phases between 0 to . The planar resonator array introduced a desired parabolic phase variations from 0 to ~2.0from the center to the edge of the reflector. It achieved a parabolic mirror-like reflection profile at a focal length of 50 cm along the axis through the metsurface plane's center. The reflector exhibits 16dBi gain enhancement at 11.8 GHz and a 3dB directionality < 5⁰ while fed by a horn antenna.