A discrete wavelet transform (DWT)-based compression technique for the computation of Kirchhoff integrals in MR/FDTD

The multiple-region FDTD (MR / FDTD) has recently been introduced as an ext ension of the classical FDTD to multiple subregions within a problem domain . In MR / FDTD, the problem domain is broken down into several volumes inte racting with each other by means of a near-field to near-field transformati on. One of the available methods is the Kirchhoff integrals, a method that has been successfully applied to FDTD, but that suffers from a high demand for computation resources. In this paper a new discrete wavelet transform ( DWT)-based compression technique for the computation of Kirchhoff integrals is presented that leads to important savings both in memory sire and compu tation time, while combining excellent accuracy and ease of implementation. (C) 2000 John Wiley & Sons, Inc.