Progress on radiation boundary conditions for electromagnetic finite element analysis

Recent progress on three types of radiation boundary conditions (RBCs) for the finite element method (FEM) is presented. The following RBCs are discussed: a rigorous implementation of the 2nd order Bayliss-Turkel type for vector FEM; an implementation of a spherical perfectly matched layer (PML); and infinite elements. The performance of the 2nd order absorbing boundary condition (ABC) and the spherical PML are compared, both with each other and with the standard 1st order ABC. Implementation issues are addressed. Current work on infinite elements for terminating tetrahedral meshes is outlined.