A finite-element-boundary integral formulation for scattering by three-dimensional cavity-backed apertures
A finite-element-boundary integral formulation for scattering by three-dimensional cavity-backed apertures
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DOI：
10.1109/8.64442
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发表时间：
1991
影响因子：
5.7
通讯作者：
Jianming Jin;J. Volakis
中科院分区：
文献类型：
--
作者：
Jianming Jin;J. Volakis
提出了一种新的数值方法，用于研究无限大地平面中三维背腔孔径的电磁散射特性。该技术结合了有限元和边界积分方法来建立求解孔径场和腔内场的方程组。具体地说，有限元法是用来制定在空腔区域的字段，和边界积分方法结合使用的等效原理来表示地面以上的字段。与传统的方法不同，所提出的技术不需要腔的绿色的功能的知识，因此，适用于任意形状的凹陷和材料填充。此外，所提出的配方导致一个系统具有部分完整和部分稀疏以及对称和带状矩阵，可以有效地解决使用特殊的算法。>
A novel numerical technique is proposed for the electromagnetic characterization of the scattering by a three-dimensional cavity-backed aperture in an infinite ground plane. The technique combines the finite element and boundary integral methods to formulate a system of equations for the solution of the aperture fields and those inside the cavity. Specifically, the finite element method is used to formulate the fields in the cavity region, and the boundary integral approach is used in conjunction with the equivalence principle to represent the fields above the ground plane. Unlike traditional approaches, the proposed technique does not require a knowledge of the cavity's Green's function and is, therefore, applicable to arbitrary shape depressions and material fillings. Furthermore, the proposed formulation leads to a system having a partly full and partly sparse as well as symmetric and banded matrix which can be solved efficiently using special algorithms. >