Multi-Beam Passive RIS for Simultaneous Multi-Target Connectivity Applications

A two state gradient metasurface based passive reflective reconfigurable intelligent surface (RIS) is proposed, which can provide upto three reflections at 12GHz. The RIS has 19×18 array of unit cells where the phase gradient is implemented along one direction. For normal incidence, three reflected beams were found to be optimum at two anomalous directions of ±56° and 0°, on the plane of incidence. The beam reconfigurability is also realized by changing the angle of incidence within 9.59°, beyond which, two reflected beams can be seen. The proposed RIS can find its application for simultaneous multi-user connectivity, especially with stationary targets.