The method of differential-Thompson transformation (DTTR) is applied for the first time to the field of electromagnetic scattering. Complex objects and their computational areas are transformed by DTTR to a regular area. By applying the finite-difference-Time-Domain (FDTD) technique, the fieM distribution is solved conveniently. Numerical a mples show good comparison with exact results. 0 ABSTRACT A highly accurate absorbing boundary operation has been devebped to efficiently and accurately truncate the computational domain when using the finite-di~erence-timeime-domain method. Referred to as the compkmentary operators method (COM), this technique consim of averaging the solutions of two indepndent boundary operators that are complementary to each other. Because of its independence of the wave number k,, the boundary operation can significantly reduce arti$cial reflections arising from obliquely incident traveling waves as well as evanescent waves. 0 1995 John Wley & Sons, lnc.
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