多层介质涂覆腔体电磁散射特性的IBC/FEM分析

将Leontovich阻抗边界条件(IBC)与矢量有限元法(EB-FEM)相结合对内壁涂覆多层介质开口腔体的电磁散射特性进行分析。将IBC和腔体口面边界积分方程分别转化为第三类边界条件形式，从而导出边值问题的相应泛函。表面输入阻抗通过广义反射系数得到，计入了介质内部电磁波的多次反射，提高了IBC／FEM混合法的精度。数值结果表明这种IBC／FEM方法在分析涂覆多层介质开口腔体电磁散射问题中的便捷性与精确性。

Analysis of Electromagnetic Scattering of a Cavity Coated with Layered Medium by IBC/FEM

Leontovich impedance boundary condition (IBC) is combine d with edge based finite element method (EB-FEM) to analyze the electromagnetic (EM) scattering of a cavity coated with a layered medium. The IBC and the bound ar y integral equation are transformed into the third boundary condition, then the functional of the boundary value problem is obtained. The surface impedance of t he layered medium is calculated by the generalized reflection coefficient, so th e multi-reflection of the electromagnetic wave in the medium is involved and th e IBC is improved. Finally numerical results are presented and results show that the IBC/FEM approach is accurate and convenient for the analysis of EM scatter ing of open -ended cavities coated with a layered medium.