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Hamilton, Joshua K.; Berry, Simon J.; Spencer, Joseph H.; Lawrence, Christopher R.; Smith, Francis C. and Drysdale, Timothy D.
(2020).
DOI: https://doi.org/10.1049/iet-map.2019.0808
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 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.
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About
- Item ORO ID
- 74714
- Item Type
- Journal Item
- ISSN
- 1751-8733
- Keywords
- optical vortices; optical variables measurement; antenna arrays; laser beams; angular momentum; optical links; optical design techniques; dimensional profiling; collimated radio‐frequency orbital; angular momentum beams; orbital angular momentum modes; radio communication;180 mm diameter; 8‐element circular antenna array; transmitted OAM beam xyz scanning stage; propagating OAM beam; beam divergence; OAM mode purity; OAM‐carrying beams; size 180.0 mm; frequency 4.0 GHz to 6.0 GHz
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2020 The Institution of Engineering and Technology
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