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Choi, EunMi
THz Vacuum Electronics and Electrodynamics
Research Interests
  • High power millimeter-wave/THz wave, vacuum electronics, plasma breakdown, electron beams, electromagnetics, microwave/RF engineering

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High-Directivity Orbital Angular Momentum Antenna for Millimeter-Wave Wireless Communications

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Title
High-Directivity Orbital Angular Momentum Antenna for Millimeter-Wave Wireless Communications
Author
Lee, IngeunSawant, AshwiniChoi, EunMi
Issue Date
2020-12
Publisher
Institute of Electrical and Electronics Engineers
Citation
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Abstract
Although orbital angular momentum (OAM) millimeter-wave wireless communications have attracted much attention given their potential to provide an additional degree of freedom in channel capacity, they still face challenges for realization. For instance, the OAM beam diverges rapidly in free space, limiting the coverage of wireless communication. To increase the communication range, we propose a high-directivity broad-bandwidth OAM antenna, which consists of a nonlinear taper and a lens-integrated metamaterial structure. A linearly polarized TE (transverse electric)11 mode traverses through the antenna to generate two OAM modes with the low reflectance of the metamaterial structure and a low divergence angle. We evaluate these two factors separately and analyze the effect of reducing the OAM divergence angle. Then, we validate the OAM antenna using the CST Microwave Studio software and experimentally verify its performance. The measured mode patterns are quantitatively analyzed using a cross-correlation function and by calculating the beam divergence angle from beam radius variations. The proposed OAM antenna provides a novel approach to effectively reduce the divergence angle of the OAM beam and may be suitable for realizing millimeter-wave wireless communications.
URI
https://scholarworks.unist.ac.kr/handle/201301/49480
URL
https://ieeexplore.ieee.org/abstract/document/9301182
DOI
10.1109/TAP.2020.3044602
ISSN
0018-926X
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