中文摘要：

应用渐近波形估计技术,快速分析了基于体积分方程的任意非均匀介质体的宽带电磁散射特性.对于任意非均匀介质体的散射分析,需要考虑介质分界面两侧体电流的法向不连续性,采用体积分方程并对电通量密度进行SWG基函数展开,很好地解决了这个问题.而对于非均匀介质体的宽带散射分析,逐个频点计算雷达散射截面是非常耗时的,文中首先采用渐近波形估计技术,推导和计算阻抗矩阵和激励矢量的高阶导数,然后在给定频点对电通量密度进行展开,用padé逼近进一步展开带宽,可以快速预估频带内任意频点的电通量密度,进而获得非均匀介质体的宽带散射特性,大大减少了计算时间.最后通过数值算例验证了该方法的准确性与高效性.

英文摘要：

The asymptotic waveform evaluation（AWE）based on the volume integral equation（VIE）is applied to accelerate wide-band electromagnetic scattering properties of arbitrarily shaped inhomogeneous dielectric bodies.For the analysis over a single frequency,the discontinuity of the normal component of the volume current on both sides of the medium interface should be considered.Nevertheless,the problem can be solved well by adoption of VIE and expansion of the electric flux density with SWG basis functions.However,the wide-band analysis requires repeated radar cross section（RCS）calculations over different frequencies,which takes excessively much time.To acquire the prediction of wide-band RCS rapidly,in this paper,AWE greatly reduces the computation time by deducing and computing the high derivatives of the impedance matrix and excitation vector,expanding the electric flux density with the Taylor series and further broadening the bandwidth using padéapproximation.Finally,numerical examples are displayed to demonstrate the accuracy and efficiency of this method.