一种新型Ku波段龙伯透镜反射器  

A Compact Ku-Band Luneburg Lens Reflector Based on Metamaterial Structures

作　　者：史绍蕊 吴昱明[2] 于浩 杨帅 吴群[1] 

机构地区：[1]哈尔滨工业大学电子与信息工程学院,哈尔滨150001 [2]北京理工大学北京毫米波与太赫兹技术重点实验室,北京100000

出　　处：《微波学报》2015年第5期73-76,共4页Journal of Microwaves

基　　金：国家自然科学基金(61401025;61371044);北京自然科学基金(4154085);上海航天技术研究院(SAST201439);北京理工大学基础研究基金(20130542016)

摘　　要：与传统制造工艺相比,3D打印技术制造龙伯透镜加工简单,精度更高,成本更低。提出一种采用超材料单元构成的新型结构的龙伯透镜反射器。通过改变单元结构的尺寸,设置梯度折射率趋于连续变化,借助电磁场三维仿真软件CST对单元结构进行仿真,利用等效媒质理论进行计算,从而得到单元结构的有效介电常数。仿真结果表明,透镜直径仅仅为75mm时的反射器就可实现-1.49d Bm2量级的RCS,并且具有宽角响应。Compared with the traditional manufacturing process,the processing is simpler,the cost is lower and the precision is higher when the Luneburg lens reflector is made by 3D printing. In this paper,a compact Ku-band Luneburg lens reflector composed of metamaterial-based unit cells has been designed,simulated and characterized. By adjusting the dimension of the unit cell,almost continuously varying gradient index can be achieved. The effective permittivity of the unit cell is calculated by the simulation software CST MICROWAVE STUDIO and evaluated by the effective medium theory. The simulation results show that the proposed Luneburg lens reflector is capable of providing a RCS of- 1. 49 d Bm2with a diameter of75mm( 4λ0at 16GHz),and a sound wide angle response as well.

关 键 词：龙伯透镜 反射器 梯度折率 人工电磁材料 

分 类 号：TH74[机械工程—光学工程]