有限大频率选择表面RCS的理论分析

THEORETICAL ANALYSIS OF RCS FROM A FINITE FREQUENCY SELECTIVE SURFACE

用矩量法配合消奇点技术分析了平行贴片振子构成的有限大频率选择表面,计算了各振子上的电流分布、单站与双站RCS散射特性及其频率选择性性,给出了工作在中心频率上的最优尺寸。文中的方法和程序中运用了对称性技巧,Toeplitz特性,优良的矩阵求逆技术以及输入参量的批处理等,节省了大量计算机时,其结果可直接用于飞行器隐身技术。

By using the moment method and the technique of singularity elimination in the field integral, the current distribution, the monostatic and bistatic radar cross section (RCS),and the frequency selective character of a plate-dipole frequency selective surface (FSS) are analyzed and computed. A general computer program is developed for this kind of applications.The best geometrical sizes of FSS elements at a given central frequency are obtained. The method, program and results can be directly used in designing the low RCS reflector antennas. By using the techniques of symmetric, the similar Toeplitz character, the advanced inversion technique of matrix, and the batch processing in the analysis and computer program, the CPU time is substantially saved.