Fast evaluation of Sommerfeld integrals for EM scattering and radiation by three-dimensional buried objects
Fast evaluation of Sommerfeld integrals for EM scattering and radiation by three-dimensional buried objects
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DOI：
10.1109/36.752208
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发表时间：
1999-03
期刊：
影响因子：
--
通讯作者：
T. Cui;W. Chew
中科院分区：
文献类型：
--
作者：
T. Cui;W. Chew
本文提出了一种求解三维埋地物体电磁散射和辐射问题的快速方法。在这种方法中，一个新的对称形式的绿色的功能，它可以减少索末菲积分的数量涉及的埋物问题。引入了沿着最陡下降路径积分和首阶近似来计算这些索末菲积分，这可以大大加快计算速度。基于索末菲积分的快速计算方法，首次分析和计算了埋在半空间中的任意方向电偶极子的辐射。然后，利用矩量法（momentum method）研究了埋地介质目标和导体目标的散射问题。数值计算结果表明，快速方法可以节省大量的CPU时间在辐射和散射问题涉及的埋地目标。
This paper presents a fast method for electromagnetic scattering and radiation problems pertinent to three-dimensional (3D) buried objects. In this approach, a new symmetrical form of the Green's function is derived, which can reduce the number of Sommerfeld integrals involved in the buried objects problem. The integration along steepest descent paths and leading-order approximations are introduced to evaluate these Sommerfeld integrals, which can greatly accelerate the computation. Based on the fast evaluation of Sommerfeld integrals, the radiation of an arbitrarily oriented electric dipole buried in a half space is first analyzed and computed. Then, the scattering by buried dielectric objects and conducting objects is considered using the method of moments (MOM). Numerical results show that the fast method can save tremendous CPU time in radiation and scattering problems involving buried objects.