Far-field gain and isolation of orbital angular momentum dual mode multiplexing

doi:10.7523/j.issn.2095-6134.2021.01.017

Abstract

Abstract: Generating vortex electromagnetic waves carrying OAM (orbital angular momentum) dual-mode multiplexing based on a uniform circular array is studied. Firstly, it theoretically discusses that a uniform circular array can generate OAM vortex electromagnetic waves,three uniform arrays of different structures, excitation settings of array elements and calculation of transmission gain are proposed. Secondly, the influence of the generated OAM dual-mode multiplexed vortex electromagnetic wave on the far-field gain in the main axis direction is discussed from the angles of the array elements in the array, the radius of the array, and the arrangement of the array elements. Finally, the degree of inter-mode interference in OAM dual-mode multiplexing is studied from the arrangement of array elements. The simulation results show that the greater the number of array elements in the circular array,the greater the far-field gain on the main axis; the difference radius in the circular array has a less influence on the far-field gain on the main axis; compared with the single arrangement, the vortex wave generated by the uniform circular array combined by two different arrangement modes has larger far-field gain on the main axis and less inter-mode interference.

Key words: uniform circular array, OAM, inter-mode interference, far-field gain

CLC Number:

TN912

CAO Leban, ZHOU Bin, BU Zhiyong, LAN Yun. Far-field gain and isolation of orbital angular momentum dual mode multiplexing[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(1): 137-144.

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