A new technique for efficient and accurate analysis of arbitrary 3D FSSs, EBGs and Metamaterials

In this paper we present a new numerically efficient and accurate technique for the analysis of doubly-infinite periodic arrays of elements, which find applications as Frequency Selective Surfaces (FSSs), Electronic Bandgap (EBGs) structures and Metamaterials (MTMs). The principal advantages of the proposed method, which is not based on the use of the Periodic Boundary Condition (PBC), are its versatility-since it can analyze 3D inhomogeneous elements-and its ability to handle arbitrary incidence angles in an efficient way, regardless of how large that angle is. It is well known that the Finite Difference Time Domain (FDTD)/PBC runs into difficulties for wide angles-requiring large computation times and becoming unstable for such angles.