Pseudospectral time-domain algorithm with non-uniformand grid and it's application to ultra wide-band pulses

Compared to FDTD algorithm, pseudospectral time-domain(PSTD) algorithm uses the pseudospectral methods for the spatial derivatives of Maxwell's equations. Simutating large-scale electromagnetic structure, this algorithm improves computative efficiency obviously. But it can't change grid scale smartly because of using FFT. To improve it's application, a new pseudospectral time-domain with non-uniform grid(PSTDNUG) algorithm based on grid transformation is developed. In this paper, the realization of PSTDNUG algorithm and it's application to high power ultra wide-band pulse technology are discussed. The validity of this algorithm is also demonstrated by calculative examples and experiment.