.fem / Of Pml Algorithm In The Analysis Of Electromagnetic Scattering Characteristics

The Finite Element Method (FEM) is one of the major numerical methods in computational electromagnetics. Due to its versatility and flexibility, the FEM is capable of modeling complicated structures as well as inhomogeneous materials. When solving electromagnetic (EM) scattering problems with the FEM, the infinite region exterior to the scatter must be truncated by a fictitious boundary. In this paper, the Perfectly Matched Layer (PML) is adopted as the truncating boundary for the analysis of conductor electromagnetic scattering problems.In this paper, it introduces the essential processes of the nodal finite element method and the vector finite element method, respectively. The theory of the plane perfectly matched layers is also been presented. Plane PML/vector FEM is employed for two- and three-dimensional EM scattering problems, and the conformal PML/nodal FEM for two-dimensional problems. Second-order triangle nodal finite elements and tetrahedral edge finite elements are used for computing scattering from two- and three-dimensional structures, respectively. In this paper, we compare the absorbing ability between the Absorbing Boundary Conditions (ABCs) and the Perfectly Matched Layers (PML). Also, we discuss deeply on the application conditions and the parameter setting of the PML. Numerical results are in excellent agreement with those presented by other papers or exact solutions.