Abstract
In wireless communications, people utilize the technology of diversity against multipath fading, so as to improve the reliability of communication equipment. One of the long-standing problems in diversity antennas is the limited number of diversity in a certain space. In this paper, we provide a solution to this issue by a three-dimensional (3D) simultaneous arbitrary-way orbital angular momentum (OAM) generator (3D SAWOG) based on transformation optics. The proposed 3D SAWOG consists of a metamaterial block and a group of transformation cylinders, by which arbitrary-way planar wavefronts can be converted to helical wavefronts with various topological charges simultaneously. The 2D four-way OAM generator and the 3D SAWOG are analyzed, designed, and simulated. The simulation results validate the performance of a 3D SAWOG successfully, indicating that the proposed model possess a high mode purity and expansibility. The SAWOG can be used as a novel diversity antenna array due to the orthogonal property among different modes, which could provide more degrees of freedom than traditional dual-polarization antennas, further improving the reliability of the communication systems.
Highlights
In order to achieve helical beams, many methods have been proposed and comprehensively analyzed
A 3D SAWOG has been proposed for the first time, by which, arbitrary beams with a variety of modes can be obtained simultaneously
The simulation results have verified the performance of a 3D SAWOG successfully, indicating that the proposed model possess a high mode purity and expansibility
Summary
Chen Zhang[1,2], Li Deng[1,2], Wei Jun Hong[1,2], Wei Xiang Jiang[3], Jian Feng Zhu[1,2], Mi Zhou[1,2], Ling Wang[1,2], Shu Fang Li1,2 & Biao Peng[1,2]. We provide a solution to this issue by a three-dimensional (3D) simultaneous arbitrary-way orbital angular momentum (OAM) generator (3D SAWOG) based on transformation optics. The SAWOG can be used as a novel diversity antenna array due to the orthogonal property among different modes, which could provide more degrees of freedom than traditional dual-polarization antennas, further improving the reliability of the communication systems. The proposed generator shows competitive advantages, including arbitrary-way generation of OAM, simultaneous different topological charges, and simple design procedure
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