COMPARATIVE-EVALUATION OF ABSORBING BOUNDARY-CONDITIONS USING GREENS-FUNCTIONS FOR LAYERED MEDIA

Absorbing boundary conditions are comparatively studied using the Gree n's functions of the vector and scalar potentials for multilayer geome tries and general sources. Since the absorbing boundaries are introduc ed as additional layers with predefined reflection coefficients into t he calculation of the Green's functions, this approach provides an abs olute measure of the effectiveness of different absorbing boundaries. The Green's functions are calculated using different reflection coeffi cients corresponding to different absorbing boundaries and compared to those obtained with no absorbing boundary. It is observed that the pe rfectly matched layer (PML) is by far the best among the other absorbi ng boundary conditions whose reflection coefficients are available.