Three-dimensional profiling of collimated radio-frequency orbital angular momentum beams

被引：1

作者：

Hamilton, Joshua K. ^{[1
,2
]}

Berry, Simon J. ^{[2
]}

Spencer, Joseph H. ^{[2
]}

Lawrence, Christopher R. ^{[2
]}

Smith, Francis C. ^{[2
]}

Drysdale, Timothy D. ^{[3
,4
]}

机构：

[1] Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England

[2] QinetiQ Ltd, Cody Technol Pk, Farnborough GU14 0LX, Hants, England

[3] Open Univ, Walton Hall, Milton Keynes MK4 2BB, Bucks, England

[4] Univ Edinburgh, Inst Digital Commun, Sch Engn, Edinburgh EH9 3FG, Midlothian, Scotland

来源：

IET MICROWAVES ANTENNAS & PROPAGATION | 2020年 / 14卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

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; GHz; LIGHT;

D O I：

10.1049/iet-map.2019.0808

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 degrees to 1.2 degrees, 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.

引用

页码：547 / 550

页数：4

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