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Generation and Focusing of Orbital Angular Momentum Based on Polarized Reflectarray at Microwave Frequency

Li, F; Chen, H; Zhou, Y; You, J; Panoiu, NC; Zhou, P; Deng, L; (2020) Generation and Focusing of Orbital Angular Momentum Based on Polarized Reflectarray at Microwave Frequency. IEEE Transactions on Microwave Theory and Techniques 10.1109/tmtt.2020.3040449. Green open access

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Abstract

A novel polarized reflectarray is designed, fabricated, and experimentally characterized to show its flexibility and efficiency to control wave generation and focusing of orbital angular momentum (OAM) vortices with desirable OAM modes in the microwave frequency regime. In order to rigorously study the generation and focusing of OAM, a versatile analytical theory is proposed to theoretically study the compensation phase of reflectarray. Two prototypes of microwave reflectarrays are fabricated and experimentally characterized at 12 GHz: one for generation and one for focusing of OAM-carrying beams. Compared with the OAM-generating reflectarray, the reflectarray for focusing OAM vortex can significantly reduce the beam diameter, and this can further improve the transmission efficiency of the OAM vortex beams. We also show that the numerical and experimental results agree very well. The proposed design method and reflectarrays may spur the development of new efficient approaches to generate and focus OAM vortex waves for applications to microwave wireless communications.

Type: Article
Title: Generation and Focusing of Orbital Angular Momentum Based on Polarized Reflectarray at Microwave Frequency
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/tmtt.2020.3040449
Publisher version: https://doi.org/10.1109/tmtt.2020.3040449
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10118249
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