基于三种反射型单元共享孔径的新型宽带低RCS反射屏设计

Design of A Novel Broadband Low RCS Array Based on Three Types of Reflective Cell Shared Aperture

该文设计了一种基于3种反射型单元共享孔径的新型宽带低RCS超表面反射屏,与传统人工磁导体反射屏相比,引入一种相量干涉单元,利用新型相位对消关系完成了对传统人工磁导体(AMC)反射屏相位对消频带的拓展。通过将3种反射单元交错排布,合理设计阵列使其满足新型相位对消条件,并进一步优化单元结构参数,实现了阵列RCS缩减和缩减带宽的拓展。在不同极化波垂直入射条件下,新型阵列均有较好的低散射性能。仿真与实测结果表明:在5.2~13.9 GHz范围内后向RCS缩减量达到10 dB以上,相对带宽达到91%,为宽带低RCS反射屏设计提供了新的方法。

A novel wideband low RCS new super-surface array based on three reflective cell shared aperture is designed,which is composed of three kinds of Artificial Magnetic Conductor(AMC).Compared with the traditional AMC array,the new array uses one of AMC as phasor interference unit.A new phase cancellation relation is presented,the new phase cancellation relation is used to extend the traditional array phase cancellation band.Then,the parameters of the cell structure are further optimized to realize the reduction of RCS and the improvement of bandwidth.The physical sample is processed and tested.The results of simulation and field test show that:the backward reduction of RCS in the range of 5.2~13.9 GHz reaches more than 10 dB,and the relative bandwidth reaches 91%.It is shown that the new array can overcome the defect of the discontinuous operating band of the traditional array and has broadband low scattering characteristics.