节点修正FDTD法计算薄层色散介质涂覆目标的雷达散射截面

The Calculations of Target Coated with Thin Layer Dispersive Medium Using Node-Amendment FDTD

在FDTD计算中,当色散介质薄层厚度小于一个元胞时,利用将电位移矢量和磁感应强度加权平均的方法,求出薄层所在元胞的等效参数,从而在二维FDTD中实现了色散介质薄层的节点修正法。通过与细网格的计算结果比较,证明该方法能处理薄层厚度小于一个元胞的色散介质薄层。计算了金属方柱涂覆薄层洛伦兹介质的雷达散射截面。

Abstract： The contribution of the dispersive layer of which thickness is thinner than the dimension of FDTD cell, is simulated by modifying the iterative formula of the nodes in the cell, including the dispersive layer. The effective parameters were obtained by averaging electric and magnetic flux density in the cell. By comparison with fine mesh, the calculation results show that the method we utilized can handle thin-layer thickness of the dispersive medium less than that of a cell-size. The radar cross section of metal rectangular bar coated with thin layer Lorentz medium have been obtained as well.