Metasurface Based Horn Replacement Antennas

A metasurface-loaded lens situated in front of an open ended rectangular waveguide is presented as an alternative to a horn antenna operating in the frequency range from 9.5 GHz to 10.5 GHz. A periodic array of single-layer unit cells is utilized to construct the metasurface, which is backed by a dielectric sphere in front of a waveguide feed. The spherical dielectric and metasurface collectively form the overall lensing structure. The lens exhibits a directive gain that is approximately 5.5 dB higher than a standard horn antenna, whilst occupying 20% less physical space.