Ricerc@Sapienza

Transmission Line (TL) theory was proposed in the past to model field propagation through conductive shields and it is currently widely used. Recently, this theory has been revisited to investigate the shielding of near-field sources by analytical and numerical techniques. The recently developed methods are here applied to analyze simple configurations of near field shielding.

An improved second order artificial material single layer (AMSL) method is proposed to predict the electromagnetic field in presence of conductive thin layers by the finite element method (FEM). The AMSL method is based on the replacement of the material physical constants of a conductive shield region with those of an artificial material. The new AMSL physical constants are analytically extracted by equating the equivalent transmission line (TL) equations governing the field propagation inside the shield with the FEM solution.

A new artificial material single layer (AMSL) model is presented to solve shielding problem. The field penetration through the conductive shield is described by lossy transmission line equations. The resulting equations are used to numerically synthetize an equivalent material for the shield region having the same geometrical configuration of the original shield, but different specific constants.