Abstract

co-authors: Federico Giusti, Enrica Martini, Stefano Maci

  The new paradigm of smart radio environment, envisaged in next and future generation communications (5,6-G), expects the deployment of intelligent surfaces, achievable with the metasurface technology. The design of such kind of devices, as well as its modeling in the propagation scenario, requires the investigation of the associated local canonical problem of a modulated metasurface (i.e., a layered multistrate periodic impedance surface). Specifically, both the impenetrable total reflecting and the perfectly transparent cases are of interest. The periodic variation of the surface impedance layer(s) permits anomalous reflection/transmission which locally permits the wave redirection toward a desired direction, thus reshaping the impinging wavefront as a reflector/lens would do, independently of the surface geometry that can be conformal to environment structures (e.g, buildings). While the analysis problem is quite standard and it is reviewed in the seminar, the inverse synthesis problem of the impedance design implementing a given wave redirection with the constraints of loss-less and gain-less pure reactive impedances (as required by power efficient metasurfaces) is much more challenging and is addressed in details.