用于5.8GHz频段的低互耦圆形微带阵列天线  

A Low Mutual Coupling Circle Microstrip Array Antenna for 5.8GHz Band

作　　者：司晴晴 曾庆生 石源 张言东 Si Qingqing;Zeng Qingsheng;Shi Yuan;Zhang Yandong(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航天学院,南京210016

出　　处：《航空兵器》2022年第3期107-113,共7页Aero Weaponry

基　　金：南京航空航天大学研究生创新基地(实验室)开放基金项目(kfjj20201501)。

摘　　要：为了有效抑制阵元间互耦对天线辐射性能的影响,提出了一种具有低互耦和低相关性的圆形微带贴片阵列天线。天线单元间加载两个对称放置的类E型电磁带隙结构,通过理论分析和实验验证,表明该电磁带隙单元可以抑制表面波传播,降低单元间的互耦。此外,为了抑制地面耦合电流从而进一步减小互耦,在地板上沿每个天线单元的边缘刻蚀一组弧形缝隙缺陷地结构。本文提出的阵列天线工作在5.8 GHz频段,单元间的最小距离仅为0.19λ。仿真结果和实验结果表明:在工作频段内,所设计的阵列天线互耦低于-40 dB,包络相关系数低于0.001,在天线尺寸较小且辐射性能良好的前提下实现了较好的去耦效果。In order to effectively suppress the influence of mutual coupling between array elements on antenna radiation performance,a novel dual-circle microstrip patch array antenna with low mutual coupling and low correlation is proposed.Two deformed E-shaped electromagnetic bang gap(EBG)structures are symmetrically inserted between two circular antenna elements,which could suppress the surface waves propagation to reduce the mutual coupling through theoretical analysis and experimental verification.In addition,several arc-shaped gap defected ground structures(DGS)are symmetrically etched on the ground plane to curb the ground coupling current,thus,the mutual coupling is further decreased.The shortest distance between the two circular antenna elements is only 0.19λwhereλis the wavelength at the working frequency of 5.8 GHz.Both the simulated and experimental results indicate that the mutual coupling of less than-40 dB and the envelope correlation coefficient(ECC)value of less than 0.001 can be achieved by the proposed decoupling antenna within its operating bandwidth,to make the good decoupling effect under the premise of small antenna size and stable radiation performance.

关 键 词：阵列天线 微带贴片 低互耦 低相关性 电磁带隙结构 缺陷地结构 

分 类 号：TJ760[兵器科学与技术—武器系统与运用工程] TN82[电子电信—信息与通信工程]