The natural finite element formulation of the impedance boundary condition in shielding structures

Abstract

The study of shielding configurations requires an analysis of ac electromagnetic fields. However, the fine meshes required within the shield make ac analysis uneconomic and a static analysis is usually employed. In this paper, the impedance boundary condition, cast in vector potential form as a general Neumann condition, is naturally imposed through Galerkin’s method to eliminate eddy currents from the domain. This allows a more exact ac analysis to be employed.