Abstract / Description of output
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.
Original language | English |
---|---|
Pages (from-to) | 547-550 |
Number of pages | 4 |
Journal | IET Microwaves, Antennas & Propagation |
Volume | 14 |
Issue number | 6 |
Early online date | 28 Feb 2020 |
DOIs | |
Publication status | Published - 20 May 2020 |
Keywords / Materials (for Non-textual outputs)
- 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