A UNIFORM GTD ANALYSIS OF THE DIFFRACTION OF ELECTROMAGNETIC-WAVES BY A SMOOTH CONVEX SURFACE
A UNIFORM GTD ANALYSIS OF THE DIFFRACTION OF ELECTROMAGNETIC-WAVES BY A SMOOTH CONVEX SURFACE
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DOI：
10.1109/tap.1980.1142396
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发表时间：
1980-01-01
影响因子：
5.7
通讯作者：
MARHEFKA, RJ
中科院分区：
文献类型：
--
作者：
PATHAK, PH;BURNSIDE, WD;MARHEFKA, RJ
研究了任意光线光电磁场在光滑理想导电凸表面上的衍射问题。Keller在他的几何衍射理论（GTD）的框架内提出了一种纯射线光学解决方案。然而，原来的GTD解决方案失败的过渡区附近的阴影边界的衍射场起着重要的作用。一个统一的GTD解决方案的开发仍然有效的阴影边界过渡区内，并减少到GTD解决方案的过渡区以外，后者的解决方案是有效的。这个统一的解决方案的建设是基于以前获得的一个简单的典型问题的渐近解。该方法可以方便、有效地应用于许多实际问题。基于这种均匀GTD解决方案的数值结果与实验吻合得很好。
The problem of the diffraction of an arbitrary ray optical electromagnetic field by a smooth perfectly conducting convex surface is investigated. A pure ray optical solution to this problem has been developed by Keller within the framework of his geometrical theory of diffraction (GTD). However, the original GTD solution fails in the transition region adjacent to the shadow boundary where the diffracted field plays a significant role. A uniform GTD solution is developed which remains valid within the shadow boundary transition region, and which reduces to the GTD solution outside this transition region where the latter solution is valid. The construction of this uniform solution is based on an asymptotic solution obtained previously for a simpler canonical problem. The present uniform GTD solution can be conveniently and efficiently applied to many practical problems. Numerical results based on this uniform GTD solution are shown to agree very well with experiments.