Optimal Design of Huygens Metasurfaces for Oblique Incidence through a Microwave Network Approach

In this contribution, we describe a simple and effective approach for the design of phase-gradient metasurfaces based on Huygens cells for oblique incidence. The approach is based on conventional microwave networks and accounts for off-normal incidence onto the cells and for their different response for the two orthogonal polarizations. In addition, it is reported a simple example in which the performance of the angularly-optimized phase-gradient metasurface is compared to the one of an equivalent device designed under normal incidence condition.