Coupling to wires in cavity enclosure using iterative algorithm

Electromagnetic field coupling to a wire placed inside a cavity enclosure through apertures has been studied by various numerical methods, such as the finite element method (FEM) and method of moments (MoM). However, published works have so far focused on coupling through small holes. We consider large apertures and cavities penetrated with wires through the aperture. The wires can be fully enclosed by the cavity or are partially interior and partially exterior to the cavity. This type of problem can be analyzed as a single unit. However, the resulting system is large and often ill-conditioned. We propose an alternative approach which decomposes the problem so that the wires and cavity are separately modeled, generating two different subsystems. The interaction between the decomposed structures is then handled by an iterative coupling approach. We validate our method by comparison of the electric field shielding (EFS) factor, which we define, with a well-validated full wave multilevel fast multipole moment method (MLFMM) (Sertel, K. and Volakis, J.L., Microwave and Optical Tech. Letters, vol.28, p.265-7, 2000; IEEE A P-S Conf. Digest, vol.4, p.1852-5, 2000).