Propuesta de esquema de optimización de FSS multicapa

Abstract

Frequency selective surfaces (FSS) are structures that filter or preserve some frequency bands. Usually, the desired spectral response is obtained tuning manually the dielectric materials and periodic geometries of the FSS. The design process of a FSS is costly and difficult to finish if the filtering response to be synthesized cannot be directly obtained with classical geometries. To overcome this problem, in this paper a heuristic method (PSO) and an analysis methodology of structures with several periodic surfaces (CG-FFT) are combined in order to automate the search. The analysis method uses a multilayer Green’s function that considers the mutual coupling effects using a transmission line model for translating the field from the source FSS to the other periodic surfaces. A comparison with commercial simulators and results for the optimization of a FSS with two periodic layers, are presented to show the usefulness of the approach.