The electromagnetic scattering of a cluster of needles based on filtered coupled-dipole approximation (FCD) is studied in this paper. This computational method is deriving from the Discrete Dipole Approximation (DDA) algorithm, which can improve the performance of standard DDA algorithm based on the sampling theory. In this study, the backscattering and bistatic scattering cross sections of a cluster of needles simulated by FCD algorithm are compared with the results obtained by standard DDA algorithm, and the accuracy of the new method is assessed by simulation results. In addition, we discuss the errors of the FCD and standard DDA algorithms generated in different relative permittivity. The simulations demonstrate that the FCD can achieve a higher accuracy than the standard DDA, even for high-permittivity scatterers.

本文研究了基于滤波偶极子近似（FCD）的针簇的电磁散射。该计算方法源于离散偶极近似（DDA）算法，该算法可以提高基于采样理论的标准DDA算法的性能。在这项研究中，将FCD算法模拟的一组针的反向散射和双基地散射截面与标准DDA算法获得的结果进行比较，并通过模拟结果评估该新方法的准确性。此外，我们讨论了在不同相对介电常数下生成的FCD和标准DDA算法的误差。仿真表明，即使对于高介电常数的散射体，FCD也可以实现比标准DDA更高的精度。