Abstract
In this paper, a generation method procedure based on a reflective metasurface is proposed to generate multiple pseudo Bessel beams with accurately controllable propagation directions and high efficiency. Firstly, by adjusting the miniaturized unit cell of the reflective metasurface to modulate the electromagnetic waves using the proposed method, some off-axis pseudo Bessel beams with different propagation directions are generated. Then, by achieving the large-angle deflection and comparing the results with previous existing methods, the superiority of the proposed method is demonstrated. Based on the generated single off-axis pseudo Bessel beam and the superposition principle of the electromagnetic wave, a reflective metasurface with 47 × 47 elements is designed and fabricated at 10 GHz to generate dual pseudo Bessel beams. Full-wave simulation and experimental measurement results validate that the dual pseudo Bessel beams were generated successfully. The propagation directions of the dual pseudo Bessel beams can be controlled accurately by the reflective metasurface, and the efficiency of the beams is 59.2% at a propagation distance of 400 mm. The energy of the beams keeps concentrating along the propagation axes, which provides a new choice for wireless power transfer and wireless communication with one source to multiple receiving targets.
Highlights
Electromagnetic waves can realize the wireless transmission of energy and information, which provide an irreplaceable role for the development of society
As the energy in the non-diffraction area has the characteristics of uniform and high efficiency, it is suitable for Bessel beams to be used in wireless power transfer (WPT) [6,7,8] and near-field communication systems [9,10]
We propose a method to generate a single off-axis pseudo Bessel beam and multiple pseudo Bessel beams with accurate propagation directions and high efficiency
Summary
Electromagnetic waves can realize the wireless transmission of energy and information, which provide an irreplaceable role for the development of society. The divergence characteristic of an electromagnetic wave limits its application, and the Bessel beam [1] with non-diffracting characteristic shows the potential to solve this problem. Bessel beams have been extensively studied, and a source with limited spatial size can only generate a quasi-Bessel beam, which has the ideal Bessel beam’s characteristics over a finite non-diffracting area [2,3,4,5]. As the energy in the non-diffraction area has the characteristics of uniform and high efficiency, it is suitable for Bessel beams to be used in wireless power transfer (WPT) [6,7,8] and near-field communication systems [9,10]. We studied some methods about steering Bessel beams or focused beams [22,23,24,25,26,27,28,29], and it is easy to find that, the Bessel beams have a wider range
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