Estimation of Radar Cross-Section in Rayleigh, MIE, and Optical Regions by the 2-D-FDTD Simulation

In this paper, the far-field electromagnetic fields were calculated by using near-field/far-field (NF/FF) transformation technique from the near field finite-difference time domain (FDTD) data obtained by total field/scattering field (TF/SF) formulation. To evaluate the effectiveness of scattering mechanisms depending on the frequency used, the target geometry and the electrical properties, first of all simple shapes such as a square cylinder, a circular cylinder, and an equilateral triangle, were studied. It has been shown that the radar cross section (RCS) calculations can be done in Rayleigh, Mie, and optical regions by the 2-D FDTD simulation. Finally, the RCS behavior of an aircraft model composed of simple shapes as ellipse and triangle are investigated for different illuminations and different frequencies.