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中文摘要：
电磁散射问题的数值解通常采用积分方程结合矩量法求解，而阻抗矩阵元素的计算是影响矩量法计算精度和效率的重要因素之一。对于电大尺寸目标，要保持计算精度，传统矩量法需成倍细化网格剖分，这将耗费大量的计算机资源，并且计算效率大为下降。针对二维散射情况，引入二级近似方法来生成阻抗矩阵，将计算结果与传统矩量法及数值积分进行了比较，结果表明：该方法在同等计算精度的前提下，所需未知量数大大减少。
英文摘要：
The electromagnetic scattering problem is often treated with integral equation and moment ot method （MOM）, and the calculation of matrix element is one of the most important factors that affecting the accuracy and efficiency of method of moment. When considering electrically large objects by the conventional MOM, the number of grid must be greatly increased to maintain the given accuracy, and the efficiency will decreased with more memory required. To complete the scattering analysis of two dimensional objects, the 2-order approximation technique is presented, and the numerical results are compared with that of the 0-order approximation technique and the numerical integration method. It is shown that the unknowns required are decreased drastically under the condition that the accuracy is not influenced.
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