In this paper, the Asymptotic Waveform Evaluation (AWE) technique is applied to study electromagnetic scattering analysis of Double-NeGative (DNG) medium. The PMCHWT equation of the DNG is deduced based on its constitutive relationship. And the surface currents and Radar Cross Section (RCS) at a single frequency point is computed; In order to achieve high-order derivation work, impedance matrix elements are managed. Then the AWE technique is applied to obtain broadband RCS frequency response of the DNG. A good agreement can be seen between AWE and the exact solution. The computational efficiency is improved significantly.%该文旨在利用渐近波形估计(AWE)技术来研究双负媒质(DNG)的电磁散射特性.文章首先从双负媒质(DNG)的本构关系出发,推导出DNG的PMCHWT方程,从而解出单频率入射波下的电流和雷达散射截面(RCS);通过对阻抗矩阵元素的处理,实现了阻抗元素高阶导数的求解,成功的将AWE技术应用于DNG宽频电磁计算领域.计算实例表明:AWE计算的结果能很好地逼近精确解,同时大大提高了计算效率.
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