Computation of electromagnetic scattering by 3D large inhomogeneous targets utilizing finite element tearing and interconnecting method

To solve electromagnetic scattering problem by 3D large inhomogeneous targets, computation of electromagnetic scattering by 3D large inhomogeneous targets continues to be a challenging task. The electromagnetic dual-primal finite element tearing and interconnecting (FETI) method is adopted in this paper. In computation model, the perfectly matched layer (PML) is used to truncate the simulation domain. Numerical experiments reveal that the PML model results in much higher accuracy over the 1st-order absorbing boundary condition model. More importantly, although the PML model gives rise to ill-conditioned discretized matrixes, FETI method could still ensure a high degree of efficiency that demonstrates great potential of FETI for analyzing electromagnetic scattering by 3D large inhomogeneous targets.