Cicheng Wang;Yuejie Yang;Yang Wang;Jiong Wu;Xiaojun Huang;Jing Jin;Helin Yang
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引用次数: 0
Abstract
Vortex waves, leveraging the orthogonal properties of orbital angular momentum (OAM), are considered of great significance in high-capacity communication systems. However, available multifunctional vortex wave generators are often constrained by dispersion effects, limiting their operation to only a few frequency points or within narrowband. In this article, a method for generating dual-mode OAM vortex waves under broadband conditions is proposed. Initially, by employing the Pancharatnam-Berry (PB) phase concept, 360° coverage of the reflective phase can be achieved on a single dielectric substrate. Subsequently, to address the reduced purity of OAM modes caused by metasurface dispersion under broadband conditions, a distance inversion method is proposed. A prototype is designed, manufactured, and measured to demonstrate the effectiveness of the proposed method. Both simulated and measured results confirm that the metasurface can generate OAM beams with
$l \,\, = \,\, -1$
and
$l \,\, = \,\, +2$
within a bandwidth from 8 to 14 GHz (54.55% relative bandwidth). Across this frequency range, the measured OAM purities for
$l \,\, = \,\, -1$
and
$l \,\, = \,\, +2$
exceed 86% and 82%, respectively. The proposed metasurface exhibits potential application in high-capacity multiplexed wireless communication systems. Furthermore, the distance inversion method can mitigate the effects of metasurface dispersion and shows promise for broadband metasurface design, as well as wavefront manipulation.
期刊介绍:
IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas, including design and development, and in the propagation of electromagnetic waves, including scattering, diffraction, and interaction with continuous media; and applications pertaining to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques