基于垂直镜面RCS减缩的周期结构弯曲性能探究及设计

Exploration and Design of Periodic Structure Bending Performance based on Vertical Mirror RCS Reduction

超材料技术越来越多地应用于雷达散射截面(RCS)减缩领域,但简单均匀结构加载在曲面目标上会出现减缩性能不稳定的问题。因此,利用CST仿真软件对电磁波入射到弯曲面情况模拟仿真,初步总结了弯曲状态下正方形周期结构RCS的性能变化规律及其原因。由于它的谐振条件被破坏,场分布不均匀,导致弯曲状态下RCS性能恶化。于是,提出了一种方环均匀结构,在不引入复杂图形的基础上,可在弯曲状态下保持RCS减缩性能的稳定。结果表明,目标体弯曲度在0°~40°,方环均匀结构在11.7~15.4 GHz内可以保证RCS减缩性能的稳定。

The supermaterial technology is increasingly applied to RCS （Radar Cross Section） reduction field, and however the problem of unstable shrinkage performance would occur when a simple homogeneous structure is loaded on a curved target. For this reason, with the CST simulation software, the incidence of electromagnetic wave on the curved surface is simulated. The performance-change law of the square periodic structure RCS under bending condition and the cause are preliminarily summarized. Due to the destruction of resonance conditions, the inhomogeneous field distribution leads to deterioration of RCS performance under bending conditions. Thus, a uniform structure of the square ring is proposed, and the stability of the RCS reduction performance may be maintained in bending state without introducing a complicated pattern. The results indicate that when the curvature of the target body is between 0°- 40° and the uniform structure of the square ring between 11.7 - 15.4 GHz, the stability of RCS reduction can be guaranteed.