A brief introduction to development history of computational electromagnetics(CEM) and numerical methods in CEM is provided. In addition, we discuss up-to-date progress of CEM in scientific researches, commercial softwares and proprietary softwares. Considering applications of electromagnetics environmental effects (E3), we present development of our numerical simulation platform of E3. Finally, future trends of development in E3 are shown.

With Maxwell equations and electron fluid equations Gaussian,damped sinusoidal broadband high-power microwave(HPM) propagation in air is analyzed by using finite difference time domain(FDTD) method.At each time grid,according to electronic velocity of narrow-band pulse,effective electric field of broadband pulse is solved with discrete Fourier transform(DFT) method.Ionization parameters at each spatial grid are updated by substituting effective electric field and pressure into corresponding formulas.Calculation accuracy is improved.It shows that broadband HPM pulse amplitude,pulse width,height above sea level have significant effect on air breakdown.Tail loss is resulted from air breakdown.As propagation distance increases,HPM pulse tail decay increases and spectrum of pulse is broadened,splited,and center frequency shifts.

when applying the method of Finite Difference Time domain(FDTD)technique combined with Thompson transformation to calculate electromagnetic scattering problems of complex objects^[1],the selection of difference schemes has an effect directly on the accuracy of numerical solution.In this paper,a new difference scheme with high order accuracy is presented,numerical results show that Thompson FDTD method can accurately calculate the electromagnetic scattering problems of arbitrary targets.