A Low-Divergence Circularly Polarized Dual-Mode OAM Antenna Based on Higher Order Laguerre–Gaussian Modes
Yuanlong Li, Kwai‐Man Luk
Abstract
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 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> 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=±1, which have a relatively low divergence angle of ±9° and high gain of around 13 dBi.
Topics & Concepts
PhysicsOpticsAngular momentumAntenna (radio)ResonatorAperture (computer memory)TelecommunicationsAcousticsComputer scienceQuantum mechanicsOrbital Angular Momentum in OpticsMetamaterials and Metasurfaces ApplicationsAdvanced Antenna and Metasurface Technologies