介质涂覆位置对球面收敛喷管电磁散射特性影响

外形设计和隐身材料使用是缩减目标雷达散射截面积(RCS)的两种常用方法。为了研究雷达吸波材料(RAM)对于球面收敛矢量喷管(SCFN)的RCS减缩效果,采用引入阻抗边界条件后的迭代物理光学(IPO)法,研究了球面收敛二元喷管及8种吸波材料涂覆方案的电磁散射特性,并获得了X波段下9种模型的后向RCS随探测角度的变化规律。研究结果表明:吸波材料涂覆可以有效地缩减球面收敛喷管的RCS;合理的涂覆方案可以在保证RCS缩减效果的基础上,降低吸波材料的使用量;相比全涂覆方案,仅在喷管出口和球面段进行涂覆,可以在吸波材料减少30%使用量的情况下,达到全涂覆方案80%的缩减效果。

Electromagnetic scattering characteristics of spherical convergent vector nozzle with coating medium at different parts

Shape design and stealth materials are generally used to reduce the radar cross section (RCS) of the target.To investigate the reduction effect of radar absorbing material (RAM) on the RCS of the spherical convergent vector nozzle (SCFN),the electromagnetic scattering characteristics of SCFN without coating radar absorbing material and eight coating solutions are studied and the backward RCS changing rule of the nine models in X band are obtained by using the iterative physics optics (IPO) with impedance boundary condition.The results show that coating the RAM can effectively reduce the RCS of the SCFN.A reasonable coating program can reduce the usage of the RAM and ensure the RCS reduction effect at the same time.It is found that 80 ％ reduction effect of the RCS can be achieved and 30 ％ less RAMs are used by coating only the wall of the spherical area and nozzle exit.