多层雷达吸波材料涂层反射系数的研究

Research on Reflecting Coefficient of Multi-layer RAM Coat

不同极化下反射系数的计算是雷达散射截面(RCS)预估中的主要问题之一,对于涂敷雷达吸波材料(RAM)涂层的目标,进行预估首先要建立反射系数与众多相关参数之间的关系式。从麦克斯韦方程和边界条件出发,导出了电磁波频率、入射角度及多层RAM涂层各层电磁参数与反射系数之间的关系式;实现了对任意层数RAM涂层反射系数的计算。最后,以两层和三层RAM涂层为例,通过仿真实验分析了电磁波的入射角、极化状态等对反射系数的影响。

Calculation of reflecting coefficients under different polarization conditions is a principle issue in prediction of Radar Cross Section （RCS）. For target coated by multi - layer Radar Absorbing Material （RAM） coat, the relationship between reflecting coefficient and many parameters should be established firstly in the prediction. Based on the Maxwell equation and the boundary condition, the relationship among frequency of electromagnetic wave, angle of incident, electromagnetic parameters of each layer in the multi - layer RAM coat and reflecting coefficient is established in the paper. And the calculation of the reflecting coefficient of arbitrary layer RAM coat is realized. Finally taking two and three layer RAM Coat as example, the influences of incident angle and polarization state on reflecting coefficient are analyzed by simulation.