电磁超构表面与天线结构一体化的低RCS阵列  

A novel low-RCS antenna array based on integration of electromagnetic metasurface and conventional antenna

作　　者：冯奎胜 李娜[1,2] 杨欢欢 Feng Kui-Sheng;Li Na;Yang Huan-Huan(College of Artificial Intelligence,Yango University,Fuzhou 350015,China;Information and Navigation College,Air Force Engineering University,Xi’an 710077,China)

机构地区：[1]阳光学院人工智能学院,福州350015 [2]空军工程大学信息与导航学院,西安710077

出　　处：《物理学报》2021年第19期74-82,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61801508,61701523,61671464);陕西省自然科学基础研究计划(批准号:2019JQ-103,2020JM-350,20200108,2020022);博士后创新基金(批准号:BX20180375,2019M653960)资助的课题。

摘　　要：提出一种电磁超构表面与天线一体化设计以实现低散射阵列的新方法.该方法利用传输线将超构表面部分单元串联,并采用同轴馈电激励,以此得到新型天线阵列,该阵列的辐射性能和传统阵列几乎相同;当外来雷达波照射该阵列时,利用超构表面和其周围天线结构散射场的差异,将能量在空间重新分配,从而实现天线工作频带内的雷达散射截面(radar cross section,RCS)减缩.基于该方法,以2×1阵列为例,构建了天线模型,数值分析了其性能,验证了该阵列的良好辐射和低RCS特征,并详细阐述了天线的工作机理,进一步的分析还揭示了超构表面结构对天线辐射和散射性能的影响规律.遵循该规律,可以灵活设计满足需求的天线阵列.该方法不仅简单易行、集成度高,还可以拓展至更大规模的阵列天线设计.Aiming at obtaining low scattering antenna array,in this paper a novel method of integrating electromagnetic metasurface with conventional antenna is proposed.The theoretical analysis and practical implementation of this method are presented.Using this method,a novel antenna array is obtained by connecting partial unit cells of metasurface with transmission line and adopting coaxial excitations.In the radiation mode,the metasurface is excited and radiates effectively.Besides,the array has almost the same performance as the conventional array.In the scattering mode,this array demonstrates low in-band RCS due to the scattering cancellation of middle metasurface and other surrounding structures.Using this method,a 2×1 array,as an example,is designed and numerically analyzed.The results show that the array has the well-behaved radiation performance and low RCS property.The working principle of the proposed array is illustrated by investigating the current and resultant field.Further analysis also reveals the effecting law of metasurface unit cells in antenna's radiation and scattering performance.Therefore,flexible designs can be obtained to fit different requirements.Finally,experiments are conducted.And the good agreement between computations and measurements further verifies the validity of the proposed design.Moreover,the proposed method also features easy implementation and high integrity and can be extended to the designing of large scale array antennas.

关 键 词：电磁超构表面 阵列天线 一体化 低雷达散射截面 

分 类 号：TN820[电子电信—信息与通信工程]