Design of a Reflecting Luneburg Lens by Metal-Only Metasurface

This paper presents the implementation of a novel surface-wave (SW) beam-forming lens. The theory of Flat Optics is used in a double-layer parallel plate waveguide (PPW) structure to create in the top PPW a plane wave steerable in the entire azimuth range. By using metallic pins, we have implemented in the bottom PPW a radially-dependent refraction index that, combined with a cylindrical reflector, results in a flat and symmetric system ideal for the excitation of reconfigurable antennas.