摘要
本文提出了一种基于漏波阵元的可辐射轨道角动量(OAM)的天线圆阵列。该阵列由周期性微带漏波天线单元绕着传播轴顺序旋转构成,阵元沿着圆周均匀分布,通过给漏波阵元给予相应的等相位差等幅激励可实现携带OAM的涡旋波辐射。阵列继承漏波阵元的优点,电磁波在不同模态的OAM下均具有频率扫描特性。此外,本文还讨论了不同频率下该天线阵列的主波束辐射方向上的涡旋波模态纯度差异。仿真结果表明,该圆阵天线频率由4.65GHz到4.95GHz变化时,各模态主波束辐射方向由法线方向向端射方向扫描,且该方向上OAM纯度由高到低变化。
In this paper,a circular antenna array with radiative orbital angular momentum(OAM)based on leaky wave elements is proposed.The array is composed of periodic microstrip leaky wave antenna elements which rotate around the propagation axis in sequence.The elements are evenly distributed along the circumference.By giving the corresponding equal phase difference and equal amplitude excitation to the leaky wave elements,the vortex wave radiation with OAM can be realized.The array inherits the advantages of leaky wave element,and the electromagnetic wave has frequency scanning characteristics in different modes of OAM.In addition,the modal purity difference of vortex wave in the radiation direction of the main beam of the antenna array at different frequencies is discussed.The simulation results show that when the frequency of the circular array antenna changes from 4.65 GHz to 4.95 GHz,the radiation direction of the main beam of each mode scans from the normal direction to the endfire direction,and the OAM purity changes from high to low in this direction.
作者
张琪芸
胡俊
张田子
杜敦伟
马毅搏
林本通
朱迪
吴文
ZHANG Qi-yun;HU Jun;ZHANGTian-zi;DU Dun-wei;MA Yi-bo;LIN Ben-tong;ZHU Di;WU Wen(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,NanJing 210094,China;Beijing Institute of Mechanical and Electrical Engineering,Beijing 100074,China)
出处
《微波学报》
CSCD
北大核心
2021年第S01期40-43,共4页
Journal of Microwaves
基金
国家自然科学基金(NSFC 61901019)
空间光电测量与感知实验室项目(502k0019119)
关键词
OAM
漏波天线
频率扫描
OAM
leaky wave antenna
frequency scanning
作者简介
张琪芸,女,1996年生,硕士生。主要研究方向:电磁场理论与天线。E-mail:Qiyun@njust.edu.cn;胡俊,男,1981年生,博士,讲师。主要研究方向:天线与阵列,电磁场与微波技术。
