A Low-Divergence Circularly Polarized Dual-Mode OAM Antenna Based on Higher Order Laguerre-Gaussian Modes

An open resonator antenna for orbital angular momentum (OAM) generation and dual-mode application is proposed. The excitation of OAM mode is deduced by the open resonator theory and the circular array theory. In the cavity, eight aperture coupled patch antenna elements are used to excite two higher-...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2021-09, Vol.69 (9), p.5215-5223
Main Authors: Li, Yuan-Long, Luk, Kwai-Man
Format: Article
Language:English
Subjects:
Angular momentum
Antenna arrays
Antennas
Cavity resonators
Circular polarization
High gain
Laguerre-Gaussian mode
Laser beams
Metasurfaces
open resonator antenna (ORA)
orbital angular momentum (OAM)
Patch antennas
Reflector antennas
Surface waves
Transmitting antennas
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Summary:An open resonator antenna for orbital angular momentum (OAM) generation and dual-mode application is proposed. The excitation of OAM mode is deduced by the open resonator theory and the circular array theory. In the cavity, eight aperture coupled patch antenna elements are used to excite two higher-order Laguerre-Gaussian HE 21 modes with a 90° phase difference. Verifying by simulation and experiment, the proposed low-profile antenna can radiate left-hand or right-hand circularly polarized waves of OAM modes l=\pm 1 , which have a relatively low divergence angle of ±9° and high gain of around 13 dBi.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2021.3060028