COMPARISON OF 2-DIMENSIONAL CONFORMAL LOCAL RADIATION BOUNDARY-CONDITIONS

Numerical solutions for open-region electromagnetic problems based on differential equations require some means of truncating the computatio nal domain. A number of local Radiation Boundary Conditions (RBCs) for general boundary shapes have been proposed during the past decade. Ma ny are generalizations of the Bayliss-Turkel RBC for circular truncati on boundaries. This paper reviews several two-dimensional RBCs for gen eral truncation boundaries. The RBCs are evaluated on the basis of the ir performance on two separate numerical tests: the annihilation of te rms in the Hankel series and the comparison of near-field and radar cr oss sections for finite element solutions to scattering problems. Thes e tests suggest that the simpler RBCs can be very competitive with RBC s based on more sophisticated derivations.