A finite-element realization of a 3-D conformal PML

The 3-D conformal perfectly matched layer (PML) is realized by the finite-e lement method (FEM). We outline the procedure e, and demonstrate that it wo rks well on highly curved scatterers. A significant challenge in this imple mentation is ensuring the continuity of the physical parameters in the PML region. We present explanation from the computer-aided geometric design (CA GD) point of view, and a normal curvature-based approximation is proposed t o overcome this difficulty. (C) 2001 John Wiley & Sons, Inc.