High frequency scattering from polygonal impedance cylinders and strips
High frequency scattering from polygonal impedance cylinders and strips
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多边形阻抗圆柱体和条带的高频散射
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
J. Volakis
中科院分区：
文献类型：
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作者：
M. I. Herman;J. Volakis
本文分析了具有任意边阻抗的凸多边形柱体的高频绕射问题。作者将他们的解推广到与双楔有关的多重衍射场（见同上，第36卷，第5期，第664 -678页，1988）。因此，分析利用扩展的光谱射线方法（ESRM），适用于非射线光学区域。衍射系数产生一个统一的总场给出了最多和包括所有四阶机制。这种分析的一个重要方面是严格和统一的表面波效应在所得的衍射系数。编写了一个通用多边形计算机代码，其中包括最多三阶机构。在此基础上，给出了三角形和正方形截面阻抗柱的后向散射和双站方向图。计算结果与相应的矩量法数据吻合较好。作为一个完整的问题，统一的衍射系数的条（这是一个特殊的情况下，一个圆柱体），可以有不相等的面阻抗。>
An analysis is presented for the high-frequency diffraction by convex polygonal cylinders with arbitrary side impedances. The authors extend their solution for the multiply diffracted fields associated with a double wedge (see ibid., vol.36, no.5, p.664-678, 1988). The analysis thus utilizes the extended spectral ray method (ESRM) that is applicable to nonray optical regions. Diffraction coefficients yielding a uniform total field are given for up to and including all fourth-order mechanisms. An important aspect of this analysis is the rigorous and uniform incorporation of the surface-wave effects in the resulting diffraction coefficients. A general polygon computer code was written that includes up to a third-order mechanisms. Based on this code, backscatter and bistatic patterns are given for impedance cylinders with triangular and square cross sections. The results are found to be in remarkable agreement with corresponding moment method data. As a matter of completeness, uniform diffraction coefficients are presented for a strip (which is a special case of a cylinder) that can have unequal face impedances. >