Computation of reflection and transmission coefficients of frequency selective surfaces using sub-entire-domain basis function method

Analyzing frequency selective surface (FSS) can be of great significance. FSS can present band-stop or band-pass properties at some specific frequency bands, and this is very helpful in designing practical electromagnetic and communication systems. The application of method of moments (MoM) in this field is very popular. However, when the electric size of FSS increases, huge in-core memory requirement and CPU time are inevitable. Besides, in actual problems, the FSS is composed of periodic conductive patches on layered dielectric substrates or aperture cells on a conductive screen with a finite size, which may be very large. Within the article, the FSS with a finite size and the dielectric substrate is modeld and solved by the sub-entire-domain (SED) base technique efficiently using Green´s function in addition to Galerkin´s procedure. Different SED bases can be generated depending on cell locations in entire structures. Then the original problem can be simplified to two smaller problems. Ways to analyze FSS´s reflection and transmission properties are described, and simulation examples are given to validate the SED base technique.