IBC/FEM Analysis of Electromagnetic Scatter of Cavities Coated with Layered Medium

Abstract

The Leontovich impedance boundary condition (IBC) is combined with the edge-based finite element method (FEM) in this paper to analyze the electromagnetic (EM) scattering of cavities coated with a multilayered dielectric. The IBC on the surface of the medium and the boundary integral equation on the aperture of the cavity are transformed into the third boundary condition, and then the functional of the boundary value problem is obtained. The surface impedance of the layered dielectric is calculated by the generalized reflection coefficient; hence, the multireflection of the EM wave in the dielectric is involved. As a result, the IBC is improved. Numerical results are presented, which demonstrate that the presented IBC/FEM approach is accurate and convenient for the analysis of EM scattering of open-ended cavities coated with the dielectric.

Keywords

edge-based finite element method, layered dielectric, impedance boundary condition (IBC), generalized reflection coefficient, coated