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OAM mode purity improvement based on antenna array
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OAM mode purity improvement based on antenna array
Orbital Angular Momentum(OAM)waves are characterized by helical wave fronts and orthogonality between different modes.Therefore,OAM waves have huge potential in improving wireless communications'channel capacity and radar imaging's resolution.Consequently,the generation and application of OAM waves have attracted a lot of attention.And many methods are proposed to generate OAM waves.Although antenna array is the most popular method of generating OAM waves,OAM waves generated by antenna array have redundant modes.However,all advantages of OAM waves are closely related to infinite OAM modes.Thus,to better apply OAM waves to wireless communications and radar,it is very important to reduce unnecessary OAM modes and improve the OAM mode purity.In order to improve the OAM mode purity,two combined antenna arrays composed of X direction antenna and Y direction antenna array are proposed in this paper.The X direction an-tenna array and the Y direction antenna array are supplied by the excitations with the same amplitude and fixed phase shift.The overall phase shift of the X direction antenna array is π/2 more or less than that of the Y direction antenna array.The results of formulas and antenna models in CST show that the combined antenna arrays can generate OAM waves with less redundant modes in x component,y component and z component.Besides,the z component carries pure OAM modes.
Orbital angular momentumAntenna arrayTheoretical formulaOAM mode Purity
Dandan Liu、Wei Wu、Liangqi Gui、Tao Jiang
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College of Weapons Engineering,Naval University of Engineering,Wuhan,430030,China
Research Center of 6G Mobile Communications,School of Cyber Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China
Orbital angular momentum Antenna array Theoretical formula OAM mode Purity
NETL
NSTL
万方数据
