Cavity-backed non-uniform partially reflective metasurface (PRM) for enhanced directivity and power extraction

We propose a novel design to enhance the directivity and power extraction of a dipole source. The design consists in a cavity-backed non-uniform partially reflective metasurface (PRM). The multiple reflections inside the cavity yield full transmission by way of constructive interference at the PRM. We show that by allowing the metasurface to be partially reflective, the realization constrains are relaxed compared to a design with a reflection-less metasurface.