A Small-Divergence-Angle Orbital Angular Momentum Metasurface Antenna.

ABSTRACT: Electromagnetic waves carrying an orbital angular momentum (OAM) are of great interest. However, most OAM antennas present disadvantages such as a complicated structure, low efficiency, and large divergence angle, which prevents their practical applications. So far, there are few papers and research focuses on the problem of the divergence angle. Herein, a metasurface antenna is proposed to obtain the OAM beams with a small divergence angle. The circular arrangement and phase gradient were used to simplify the structure of the metasurface and obtain the small divergence angle, respectively. The proposed metasurface antenna presents a high transmission coefficient and effectively decreases the divergence angle of the OAM beam. All the theoretical analyses and derivation calculations were va

SUBMITTER: Xu J 

PROVIDER: S-EPMC6946278 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature