Finite element analysis of electromagnetic wave diffraction from buildings incorporating frequency selective walls

A finite-element approach has been used to study the field distribution inside a simple building construction illuminated by a plane wave. To solve electromagnetic scattering problems for such electrically large dielectric objects, which can have losses and frequency selective surfaces in their construction, a hybrid FE method has been chosen. A numerical example demonstrates the contribution of an array of metal rods, such as are used for reinforcement in building work, to the transmission/reflection properties of the dielectric walls of a simple room, and the consequent effect on the fields inside. Computed field distributions are presented at frequencies where the equivalent wall grating transmittivities are high and low, but typical of values obtained with single-layer FSS.