Three-dimensional profiling of collimated radio-frequency orbital angular momentum beams
Hamilton, JK; Berry, SJ; Spencer, JH; et al.Lawrence, CR; Smith, FC; Drysdale, TD
Date: 14 February 2020
Journal
IET Microwaves, Antennas & Propagation
Publisher
Institution of Engineering and Technology (IET)
Publisher DOI
Abstract
The use of orbital angular momentum (OAM) modes in radio communication is thought to enhance capacity. This
work focuses on using the l = +1 mode transmitted from a 180 mm diameter, 8-element circular antenna array. The transmitted
OAM beam was collimated by using a spherical mirror and the intensity and phase were investigated. A ...
The use of orbital angular momentum (OAM) modes in radio communication is thought to enhance capacity. This
work focuses on using the l = +1 mode transmitted from a 180 mm diameter, 8-element circular antenna array. The transmitted
OAM beam was collimated by using a spherical mirror and the intensity and phase were investigated. A xyz scanning stage was
used to profile the propagating OAM beam in three dimensions, resulting in a detailed investigation into the effects of collimation
on the OAM beam. The proposed system was shown to reduce the beam divergence from 36.6° to 1.2°, without affecting the
OAM mode purity of the beam for a frequency range of 4–6 GHz. This investigation showed a step towards realising practical
control over the divergence of OAM-carrying beams.
Engineering
Faculty of Environment, Science and Economy
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