非均匀网格时域伪谱算法在超宽带技术中的应用
Pseudospectral time-domain algorithm with non-uniformand grid and it's application to ultra wide-band pulses
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摘要: 与传统时域有限差分算法相比，采用以伪谱方法离散Maxwell微分方程为基础的时域伪谱(PSTD)算法计算大的电尺度电磁场时域问题，将大大提高计算效率，降低内存需求。为了拓宽PSTD算法的应用，近年来，基于网格插值方法的非均匀时域伪谱算法得到了发展。研究的重点是算法中非均匀网格技术的实现及其在时域瞬态脉冲电磁场模拟和高功率超宽带脉冲技术方面的应用。以高斯脉冲为激励源，用该算法计算了多层介质的反射和透射，并通过超宽带脉冲穿墙实验对这一方法的应用进行了验证。模拟和实验结果具有较好的一致性。
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关键词:
- 时域伪谱方法 /
- 时域有限差分方法 /
- 超宽带 /
- 非均匀网格时域伪谱算法
Abstract: 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. -
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