Backscatter analysis of dihedral corner reflectors using physical optics and the physical theory of diffraction
Backscatter analysis of dihedral corner reflectors using physical optics and the physical theory of diffraction
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DOI：
10.1109/tap.1987.1143987
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发表时间：
1987-10
影响因子：
5.7
通讯作者：
T. Griesser;C. Balanis
中科院分区：
文献类型：
--
作者：
T. Griesser;C. Balanis
用物理光学(PO)和物理绕射理论(PTD)确定了二面角反射器在方位平面上垂直和水平偏振的后向散射截面。该分析包括单反射、双反射和三反射；单衍射；以及反射-衍射。对比了分析这些后向散射机制的两种方法。在第一种方法中，几何光学(GO)被用来代替初始反射时的物理光学，以保持反射波的平面性，从而降低分析的复杂性。这样做的目的是避免任何不能以封闭形式执行的曲面积分。这种技术很受欢迎，因为它本质上很简单，很容易受到计算机解决方案的影响。在第二种方法中，几乎在每一次反射时都使用物理光学来最大化PTD解决方案的精度，但代价是复杂性迅速增加。在这种技术中，许多积分都不容易执行，必须使用数值技术。然而，这项技术可以显著提高精度。文中给出了这两种方法的感生表面电流密度和产生的截面图案。实验测量证实了具有直角、锐角和钝角内角的二面角反射器的解析计算的准确性。
Physical optics (PO) and the physical theory of diffraction (PTD) are used to determine the backscatter cross sections of dihedral corner reflectors in the azimuthal plane for the vertical and horizontal polarizations. The analysis incorporates single, double, and triple reflections; single diffractions; and reflection-diffractions. Two techniques for analyzing these backscatter mechanisms are contrasted. In the first method, geometrical optics (GO) is used in place of physical optics at initial reflections to maintain the planar nature of the reflected wave and subsequently reduce the complexity of the analysis. The objective is to avoid any surface integrations which cannot be performed in closed form. This technique is popular because it is inherently simple and is readily amenable to computer solutions. In the second method, physical optics is used at nearly every reflection to maximize the accuracy of the PTD solution at the expense of a rapid increase in complexity. In this technique, many of the integrations cannot be easily performed, and numerical techniques must be utilized. However, this technique can yield significant improvements in accuracy. In this paper, the induced surface current densities and the resulting cross section patterns are illustrated for these two methods. Experimental measurements confirm the accuracy of the analytical calculations for dihedral corner reflectors with right, acute, and obtuse interior angles.