Fast prediction of the shielding effectiveness of heterotypic enclosures based on EMT theory

Abstract

A fast analytical method for predicting the shielding effectiveness (SE) of heterotypic enclosures was proposed. By applying the concept of electromagnetic topology, the observation points and the walls are treated as nodes, and the space between them as tubes. Equivalent circuit models of the enclosures are derived in which the aperture on the front wall are considered as a two-port network and so is the shape of the discontinuous part, which resembles a window structure. Then, the expressions of the total voltage components can be obtained using the extended Baum–Liu–Tesche (BLT) equation. Three different types of heterotypic enclosures are proposed to validate the method. Compared with numerical simulation, the proposed method can reduce the computation time from 1000 s for numerical algorithms to a few hundred milliseconds while maintaining a very close accuracy.