缝隙目标电磁散射特性试验

 通过对目标结构进行合理设计,可以在一定角域内显著减小雷达散射截面(RCS)。对飞行器表面常见锯齿缝隙的散射特性进行了研究。在微波暗室内对锯齿缝隙分别沿俯仰角变化、方位角变化的减缩效果进行测试。俯仰角变化时，锯齿缝隙有较好的减缩作用，以114°锯齿缝隙在试验中减缩效果最好。方位角变化时，对114°锯齿缝隙进行了多频段测试，并与相应直缝隙进行了对比研究，结果表明，通过选取合适的方位角角域，锯齿缝隙的减缩作用会随入射波频率的升高和仰角的增大而显著增强。结论可为高性能隐身飞行器外形隐身设计提供参考。

Experimentation on Scattering Characteristics of Serrate Gap

Radar cross section (RCS) can be reduced significantly in a certain angle range by reasonably modifying target structure for stealth purpose. In this article the electromagnetic scattering characteristics of serrate gaps common in aircraft surfaces are investigated. The reduction effects of serrate gaps that changed with pitch angle and azimuth angle are tested in a microwave darkroom. The results show that, as the pitch angle is changing, different degree serrate gaps, especially the 114° serrate gap in this testing environment, produce the RCS reduction effect much better as compared with straight gap on the same plate. The electromagnetic scattering characteristics of the 114° serrate gap in multiwaves are then investigated to compare with those of the straight gap with changed azimuth angle. The results show that compared with straight gap, RCS reduction effects of the 114° serrate gap can be enhanced with the elevation of incidence frequency and the accretion of pitch angle in certain selection range of azimuth angles. The results can be used as references in the profile design of high-performance stealth aircraft.