冯晓萌^1，， 姬艳丽^2，， 王朝炜^1，*， 王卫东^1，

（  1、电子工程学院，北京邮电大学，100876；       2、网络教育学院，北京邮电大学，100876；  ）

摘要： 本文论证了具有相位精确设置的n元偶极子阵的的圆形天线阵列可以产生具有轨道角动量（OAM）的涡流电磁波。在球坐标系中推导了其辐射远场的理论公式，并用于分析涡旋波的辐射方向图和相位分布。提出圆形天线阵模型，用4NEC2验证理论结果。仿真结果与理论分析吻合得很好。计算结果和仿真结果表明，涡旋波具有中心波瓣为零的辐射方向图。
关键词： 轨道角动量；圆环阵列天线；辐射波瓣图;涡旋波。

Feng Xiaomeng^1,， Ji Yanli^2,， Wang Chaowei^1,*， Wang Weidong^1,

（  1、the School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China 100876；       2、the School of Internet Education, Beijing University of Posts and Telecommunications, Beijing, China 100876；  ）

Abstract： This paper demonstrates that the circular antenna array with its nth element dipole phased by an accurate setting can generate the vortex radio beams possessing orbital angular momentum (OAM). Theoretical formulations of its radiation far-field are deduced in the spherical coordinate system and are used to analyze radiation pattern and phase distribution of vortex radio beams. The model of a simulated configuration for circular antenna array is proposed and conducted to validate the theoretical results using 4nec2. Simulation results match well with the theoretical analysis. Both calculated results and simulation results show vortex radio beams possess amplitude null on radiation pattern.
Keywords： Orbital angular momentum (OAM), circular antenna array, radiation pattern, vortex radio beams.

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