具有陡降特性的新型混合单元频率选择表面  

A novel frequency selective surface of hybrid-element type with sharply decreased stop-band

作　　者：王岩松[1] 高劲松[1] 徐念喜[1] 汤洋 陈新[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所中国科学院光学系统先进制造技术重点实验室,长春130033

出　　处：《物理学报》2014年第7期365-371,共7页Acta Physica Sinica

基　　金：长春光机所重点实验室基金(批准号:YZGX1SJ13A)资助的课题~~

摘　　要：频率选择雷达罩是频率选择表面(FSS)的重要应用之一,为了获得频率选择雷达罩更好的隐身性能,设计了一种基于开孔单元FSS新型单元FSS.这种新型单元是在原有开孔单元周期边界处增加条形孔构成,其传输性能兼具开孔型和贴片型FSS的特征,因此称作混合单元频率选择表面.以FSS在某导弹雷达罩上的应用为背景,采用周期矩量法及离散粒子群算法进行设计优化.仿真结果表明,新型混合单元FSS与对应的开孔型FSS相比具有更陡峭的过渡带和更低的阻带透过率;与双屏FSS相比具有更低的通带插入损耗和更薄的厚度,且结构和制作工艺相对简单.采用自由空间法对等效平板样件进行传输性能测试,测试和仿真曲线符合较好,验证了设计的准确性和可行性.新型混合单元FSS特别适用于敌我双方工作频段接近的情形,它的提出为FSS隐身雷达罩研制提供了一条可行性较高的新途径.Frequency selective radome is one of the most important applications of frequency selective surface （FSS）. In order to obtain better stealth performance, a novel element FSS, based on a regular slot element FSS, is presented in this paper. The novel element consists of a slot element in the center and at least two slot strips placed on the periodic boundary. We call such FSS the ＂hybrid-element type FSS＂ because it exhibits characteristics of both slot type and patch type FSS. Simulation and optimization work is carried out by using a period moment method and a discrete particle swarm optimization method based on the application requirements of a missile radome. Simulation results show that the hybrid-element type FSS has much steeper transition section between pass-band and stop-band, and much lower transmittance in stop-band when compared with the corresponding slot type FSS. The new FSS also has much lower insertion loss in pass-band, much thinner thickness, much simple structure and fabrication process when compared with the ordinary two-layer FSS. Equivalent sample plate is fabricated using printed circuit method and tested using the free space method. Good fit between simulation and testing results verify the accuracy and feasibility of this novel FSS design. The hybrid-element type FSS is especially suitable for the stealth radome when woking frequencies of both sides are very close. It provides a simple and feasible approach for developing frequency selective radome.

关 键 词：频率选择表面 混合单元 

分 类 号：TN957[电子电信—信号与信息处理]