Absorbing boundary condition convergence comparisons

The authors compare second-order Mur, first-order Mur with superabsorption technique and second-order Liao outer radiating boundary conditions (ORBCs). The convergence rate of the ORBCs are compared for a variety of scattering and radiation problems by successively increasing the white space border. This parametric study is designed to see which ORBC has the fastest convergence rate for various typical real world applications. The ORBCs were applied to the scattered fields on the outer surface of the problem space using the Yee algorithm in a scattered field formulation. Although each of the three ORBCs requires roughly the same amount of CPU time and storage, the convergence rates for various problems can be quite different.<>