有源周期性结构控制电磁波反射波束指向研究

提出有源反射的概念.利用如光带隙电磁结晶结构、高阻抗结构等周期性结构的带隙特性和 阻抗特性,通过在类似高阻抗表面的周期性金属单元表面铺设有源器件--变容二极管,控 制周期性结构的性能,建立有源周期性结构,影响入射电磁波的传播特性,实现对反射波束 的指向的有源控制和有效改变.仿真实验证明采用单层或双层有源周期性结构表面,可以有 效控制反射波束的相位和角度指向.

Study of active periodical structure′s controlling the direction of reflector electromagnetic wave

The conception of active reflection was presented. Using th e periodical surface′s character of band gap and impedance transition of electr omagnetic crystal structure such as photonic band gap(PBG), frequency selection surface(FSS), high impedance surface(HIS) and so on, the varactor diode was p ut onto the approximate HIS′s surface to join each cell of metal on top layer t o realize the electronic control for periodical structure. The active periodical structure was eslablished. The propagation characteristic of incident electromagnetic wave was effected and controlling the refle cted phase and direction of reflector electromagnetic wave were realized. The si mulation test proves that this method and technology can control reflector w ave′s phase and direction of on working freque ncy band by using single or double layer active periodical structure effectively .