Selected Advances in Beam-forming Metastructures and Metasurfaces

Three developments in beam-forming with metastructures and metasurfaces are presented. First, a metastructure is presented where the phase-addition property of mixers is used to significantly reduce the number of beamformers in an electrically-scanned antenna system with reconfigurable amplitude distribution. A beam-shaping scheme is also presented along with measured array factors. Secondly, amplitude and phase shaping with a reconfigurable reflective metasurface is demonstrated. Lastly, a passive metasurface design for anomalous reflection that maintains high directivity at a fixed angle over a broad bandwidth is proposed.