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Orbital Angular Momentum (OAM) Mode-Reconfigurable Discrete Dielectric Lens Operating at 300 GHz

Wu, G-B; Chan, KF; Qu, S-W; Tong, KF; Chan, CH; (2020) Orbital Angular Momentum (OAM) Mode-Reconfigurable Discrete Dielectric Lens Operating at 300 GHz. IEEE Transactions on Terahertz Science and Technology , 10 (5) pp. 480-489. 10.1109/TTHZ.2020.2984451. Green open access

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Abstract

A novel three-dimensional printed discrete dielectric lens (DDL) antenna with orbital angular momentum (OAM) mode reconfigurability operating at 300 GHz is proposed in this article. The antenna consists of a stationary lower DDL and an upper in-plane rotatable DDL, fed by a stationary pyramidal horn. The DDL pair can transform the quasi-Gaussian beam from the feed source into vortex waves, and its OAM mode number, l, can be dynamically reconfigured among 0, ±1, and ±2 by a simple mechanical in-plane rotation of the upper DDL panel with specific angles relative to the stationary lower one. For the DDL design, the height of each dielectric post pixel element is tuned to realize the required transmission phase. The OAM mode-reconfigurability of the proposed terahertz (THz) antenna was validated by both simulations and measurements. The simulated OAM mode purity bandwidth of the design DDL antenna are 40%, 31.3%, and 25.8% for the OAM mode l = 0, +1, and +2, respectively. In addition, the THz line-of-sight link experiments show that acceptable mode isolations among different OAM channels can be achieved by the THz DDL antenna, validating its application for OAM mode diversity.

Type: Article
Title: Orbital Angular Momentum (OAM) Mode-Reconfigurable Discrete Dielectric Lens Operating at 300 GHz
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TTHZ.2020.2984451
Publisher version: https://doi.org/10.1109/TTHZ.2020.2984451
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.
Keywords: Dielectrics, Feeds, Lenses, Transforms, Antenna measurements, Antenna arrays
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/10113127
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