Recent progress on FSS and extraordinary transmission analytical modeling

The modeling of the scattering of plane waves by 1D/2D periodic distributions of planar scatterers has been a classical research topic in applied electromagnetism for decades. The authors of this paper initiated a research line in this field seven years ago, which was mostly motivated by our interaction with Prof. Mario Sorolla during his sabbatical leave in our lab. He introduced us to the topic of extraordinary transmission through sub-wavelength apertures in metal plates. This contribution presents our most recent advances on the subject, focused on the analytical circuit modeling of 1D mushroom-like structures and 2D arrays of rectangular patches/apertures under conical incidence illumination. Multi-modal equivalent networks are rigorously derived from the corresponding integral equations. The values of the electrical parameters of those networks are systematically obtained from reasonable estimations of the currents and fields.