Exploiting Composite Vortices in the Design of Reconfigurable Intelligent Surfaces

Recently, great efforts have been made in the research of new enabling technologies for beyond 5G communication systems. In this framework, Reconfigurable Intelligent Surfaces (RISs) are considered as one of the most promising solutions and, thus, they have been the subject of several investigations by both the electromagnetic and the communication communities. In this contribution, we further discuss, from an electromagnetic point of view, about the synthesis of a RIS. In particular, by exploiting the topological properties of vortex modes, we present a possible solution to simplify the synthesis and the reconfigurability of a RIS composed of concentric annular rings.