On the Design of EMSs Through Nullspace Surface Currents Optimization

The issue of synthesizing Static Passive Electromagnetic Skins (SP-EMS) fitting both radiation-related and non-radiation-related design constraints is addressed here. Based on the Inverse Source (IS) theory, a novel synthesis method is described to exploit the nullspace surface currents and determine the SP-EMS geometry satisfying the design constraints and giving rise to the desired scattering pattern. The design method is evaluated in a numerical simulation aimed at the design of an SP-EMS employing an inexpensive, cardboard-based dielectric substrate suitable for large-scale deployment.