Application of an hp-adaptive FE method for computing electromagnetic scattering in the frequency domain

Herein the electromagnetic scattering is determined using the finite element method. In particular the radar cross section of the scatterer is estimated. Comparison between the finite element method (FEM), method of moments (MoM) and the method of physical optics (PO) is made in one numerical example. In another numerical example, the convergence rate is compared using pure h-refinement, p-enrichment and with a priori hp-adaptive refinements. The gain using the hp-adaptive approach is significant since an exponential convergence may be obtained.