利用中心阻抗载荷减小中等圆柱形结构的雷达横截面

O.M. Braga Filho, A.J. de Faro Orlando, Antonio C. C. Migliano
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引用次数: 4

摘要

本文从理论上研究了在正侧入射平面电磁波照射下,受集中阻抗中心加载的中等半径圆柱形结构的雷达截面积最小化问题。得到了圆柱体表面感应电流和RCS的表达式,并导出了中等尺寸圆柱体使RCS最小的最佳负载阻抗表达式。RCS的降低是由于中心负载圆柱体的阻抗降低了表面电流,从而降低了RCS。利用计算天线内电流分布的哈伦法推导了电流和阻抗方程。给出了圆柱内和RCS内感应电流分布的计算曲线,并对长度不超过/spl λ //2的偶极子中阻抗加载的实验结果与理论计算结果进行了比较。对于这样的偶极子,通过适当的被动中心加载,可以将宽侧RCS降低30至40 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduction of the radar cross section of a moderate cylindrical structure using central impedance loading
A theoretical study on the minimization of the radar cross section (RCS) of a cylindrical structure of moderate radius centrally loaded by a lumped impedance that is illuminated by a plane electromagnetic wave at normal broadside incidence is presented. Expressions for the induced current on the surface of the cylinder and for the RCS are obtained, and an equation for the optimum loading impedance that minimizes the RCS for moderate cylinders is also derived. The reduction of the RCS is achieved because the impedance that centrally loads the cylinder reduces the superficial current and consequently the RCS. The current and impedance equations are derived using the Hallen' method for calculating the current distribution in antennas. Computed curves of the induced current distribution in the cylinder and of the RCS are presented and experimental results for moderate impedance loading of dipoles not much longer than /spl lambda//2 are compared with the theoretical computations. For such dipoles, the broadside RCS can be reduced by 30 to 40 dB with appropriate passive center loading.
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