期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 70, 期 1, 页码 365-377出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3111522
关键词
Metasurfaces; Antennas; Antenna arrays; Transmitting antennas; Slot antennas; Metals; Dielectrics; Aperture field; beam steering; circular polarization; circularly polarized (CP); communication on the move (COTM); consumer terminal; flat lens; flat panel; frequency-selective surface (FSS); geostationary orbit (GEO); high gain; Ka; Ku; lens antenna; low earth orbit (LEO); Luneburg; medium earth orbit (MEO); phase shifting surface; phase transformation; prisms; radial-line slot array (RLSA); reconfigurable antenna; reflectarray; Risley; SATCOM; satellite on the move (SOTM); satellite terminal; satellite tracking; space Internet; transmitarray
资金
- Australian Government through the Australian Research Council Discovery Grant Scheme
- University of Technology Sydney through the Faculty of Engineering and IT Seed Grant
This study presents a continuous beam-steering solution for circularly polarized radial-line slot array (RLSA) antennas, implemented through near-field meta-steering method. The system utilizes highly transmitting hybrid metasurfaces (HMs) to steer the beam in a 2-D space. Experimental results demonstrate the system's wide steering range, high gain, and low power consumption.
A continuous beam-steering solution for circularly polarized (CP) radial-line slot array (RLSA) antennas is presented and demonstrated with a fabricated prototype. The solution is based on the near-field meta-steering (NFMS) method, which is implemented through a pair of highly transmitting hybrid metasurfaces (HMs) that are placed above a high-gain CP RLSA antenna in the near-field region. Cells in HMs, unlike conventional metasurfaces (CMs), can provide exact or close to exact phase shift with transmission magnitude larger than -1 dB. This is achieved by combining the nonoverlapping phase ranges of two dramatically different phase-shifting cells. The RLSA is stationary, while the two HMs are rotated to steer the beam in a 2-D (azimuth and elevation) space. The measured results of the prototype demonstrate that the system can steer its beam to a maximum elevation angle of 40.6 degrees with a maximum gain of 30.9 dBic. The axial ratio remained less than 3 dB in the 3 dB beamwidth even when the beam is steered. The height of the system is only 4.5 cm, which is much less than mechanically steered reflector antennas. Unlike electronically steered high-gain antenna arrays, this system requires only few watts of power only when rotating HMs and has zero power consumption when the beam is stationary.
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