Broad-Band Multiple OAMs' Generation with Eight-arm Archimedean Spiral Antenna (ASA)

Yang Yang, Yubin Gong, Kai Guo, Fei Shen, Jinghua Sun, Zhongyi Guo
2020 IEEE Access  
In this paper, an eight-arm Archimedean spiral antenna (ASA) is proposed to generate multiple orbital angular momentum (OAM) modes over a respectable frequency band (1.9-3GHz). Firstly, the principle of radiation by eight-arm ASA with right-hand spiral line is analyzed and simulated. It is demonstrated that the OAM modes and polarizations of the generated vortex waves are reconfigurable by changing the fed phases of the eight arms and controlling the radius of the antenna arm. Meanwhile, a
more » ... type is fabricated and measured, in which experimental results agree well with simulation ones. At last, compared with other recently reported OAM-generating antennas, the proposed antenna with the smaller structure ( 2.45λ 0 , where λ 0 is the wavelength of the center frequency) can produce the higher gain (4.5-11.2dBi) vortex waves carrying multiple OAM modes (five modes) in the broad band of 1.9-3GHz. INDEX TERMS Archimedean spiral antenna (ASA), left-hand circularly polarized (LCP), right-hand circularly polarized (RCP), orbital angular momentum (OAM), vortex wave. 53232 This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ VOLUME 8, 2020
doi:10.1109/access.2020.2980751 fatcat:lp2owkfhxjeuje6ivnyirdrz34