Study and computation of transient electromagnetic propagation and scattering in dispersive media are difficult

especially

the direct analysis in time-domain.A modified finite-difference in time domain（FD-TD） method for computation of transient propagation and scattering fields is presented in this paper.The results obtained from this way are visualable and faithful

and an efficient direct way of numencal modelling to study the characteristic of transient fields in dispersive media and the wideband problems in research fields of target detection

eletromagnetic compatibility and stealth technology is provided as well.