ABSTRACT
This chapter explains the method of moments (MoM) adapted to the simulation of fields in periodic and nonperiodic structures. The integral equation (IE) techniques are known for providing accurate results when modeling conducting and dielectric structures. A drawback of the MoM is that the matrices associated to the resulting linear systems of equations are dense, and their inversion may require significant computational resources for complex structures, or for large structures as compared to the wavelength. Hence, the surface IE for the tangential electric and magnetic fields will be primarily discussed, whereas a few references will be provided to the volumetric approaches, which enable the analysis of inhomogeneous media. Recently, periodic structures in layered media have attracted considerable attention in the context of modeling metamaterials and photonic crystals, and the study of enhanced transmission through sub-wavelength apertures in perforated screens.
