Study Of Gridding Technique In FDTD Method And Scattering Of Thin-wire Near Ground

The Finite-Difference Time-Domain (FDTD) technique has been effectively appliedto the analysis of electromagnetic (EM) scattering problems. In order to improve thevalidity and the accuracy of FDTD method, two kinds of subgridding methods andconformal technique are discussed. The subgridding theories are given and the two-dimensional programs are set up. To simulate the curve PEC object more precisely, wepresent a simple yet accurate conformal algorithm for the FDTD analysis of 2-D and 3-DPEC object scattering problems. Accuracy of this method is illustrated by comparing theresults derived from this method with the experimental data. In addition, we treat thenuclear electromagnetic pulse coupling problem. The induced current of an infinitely longconductor transmission line located above a lossy homogeneous medium is computed byusing FDTD method.