三维复杂腔体的时域有限差分法分析

FDTD Analysis of Three-Dimensional Complex Cavity

在计算三维复杂腔体雷达截面的时域有限差分法中 ,提出了一种简单的计算域设置方法。它由腔壁和腔口面外侧的吸收边界围成 ,与包围目标的常用计算域设置方法相比 ,忽略了腔边缘的绕射作用 ,但具有节省计算机存储空间 ,无需额外抽取外腔壁对电磁波的散射。

A simple setting method for calculational domain is proposed in the computation of the radar cross section (RCS) of three-dimensional complex cavity with finite-difference time-domain (FDTD) method. The calculational domain is constituted by the walls and absorbing boundary of outside open end of the cavity. Compared with the computation with traditionally calculational domain the target objects is enclosed by absorbing boundaries. Although the diffraction of the edges of cavity is ignored, the method has the merit of saving memory of computer and the additional calculation of electromagnetic scattering outside the cavity is eliminated. The validity of the method is verified by numerical results.