The simulation of electromagnetic scattering from a cluster of needles based on discrete dipole approximation

Abstract

In this paper, the volume integration equation based on Discrete Dipole Approximation (DDA) is applied to calculating the electromagnetic scattering field of a cluster of needles. The cubic dipole cells are used to discretize scatterers. Furthermore, this paper novelly considers the role of the irregular parts of the scatterers' edge. The backscattering cross section and the bistatic scattering cross section of the cluster of needles calculated by DDA algorithm are compared with the results obtained by the analytical algorithms of the Generalized by Rayleigh-Gans Approximation (GRGA) algorithm and Thin Dielectric Cylinder (TDC) algorithm. In addition, the comparison of the results with considering the parts in the edge of scatterers and without considering it is presented in this paper. The simulation demonstrates that the numerical solution is better than the analytical solution, but the analytic solution is more efficient in the backscattering and bistatic scattering of a cluster of needles. Moreover, the algorithm considering the portion in the edge of the scatterers can improve computational efficiency and reduce storage space. In conclusion, the study for bistatic scattering of dense scatterers by taking into account the parts in the edge of scatterers are meaningful in the sight of computational efficiency and accuracy.