AN EXACT METHOD FOR SIMULATING BOUNDARY-CONDITIONS FOR MESH TERMINATION IN FINITE-DIFFERENCE TECHNIQUES

Finite-difference methods are standard techniques for solving the diff erential form of Maxwell's equations. In spite of many advantages, a d rawback of the technique is how to implement an absorbing boundary con dition in an essentially exact fashion. In this article an absorbing b oundary condition is proposed based on the Green's functions arising i n integral equations. The radiation condition in this approach is buil t up iteratively as the solution progresses, utilizing the Green's fun ction. In the proposed method only two layers of meshes outside the bo undary may be sufficient. Examples have been presented for the electro static case to illustrate the accuracy and convergence of this new tec hnique. (C) 1995 John Wiley & Sons, Inc.