Resistive suppression of edge effects in MLFMA scattering from finite conductivity surfaces
Resistive suppression of edge effects in MLFMA scattering from finite conductivity surfaces
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DOI：
10.1109/tap.2005.846810
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发表时间：
2005-05
影响因子：
5.7
通讯作者：
Zhiqin Zhao;J. West
中科院分区：
文献类型：
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作者：
Zhiqin Zhao;J. West
在计算任意粗糙面散射的三维数值多层快速多极子算法中，考虑了用阻性加载来抑制边缘绕射效应。载荷的有效性类似于早期工作中使用二维矩方法获得的结果，该方法适用于在方位方向上无限均匀的表面。加载极大地减少了边缘的直接背向衍射。然而，如果前沿加载区域上的局部入射角超过约70/spl deg/，则加载引起的电流扰动可能会引入显著误差。对于使用阻抗边界条件建模的有限导电面，加载是有效的。这种方法特别适用于高入射(低掠射)的表面，其中施加载荷的前沿和后缘可以自然地从水平向下倾斜，而不影响散射。
The use of resistive loading to suppress edge-diffraction effects in three-dimensional numerical multilevel fast multipole algorithm calculation of scattering from arbitrary rough surfaces has been considered. The effectiveness of the loading is similar to that obtained in earlier work using a two-dimensional moment method applied to surfaces that are infinitely uniform in the azimuthal direction. The loading dramatically reduces the direct back-diffraction from the edges. However, current perturbations induced by the loading can introduce significant errors if the local angle of incidence on the leading-edge loaded area exceeds approximately 70/spl deg/. The loading is effective with finite conductivity surfaces modeled using impedance boundary conditions. The method is particularly suitable for use at high incidence (low grazing) with surfaces where the leading and trailing edges on which the loading is applied may be naturally angled downward from horizontal without affecting the scattering.