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Metasurface-based non-diffractive beam deflection planar Bessel lens and method

A beam deflection and metasurface technology, applied in the field of non-diffractive antennas, can solve the problems of difficult integration and complex structure, etc.

Active Publication Date: 2020-12-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a planar Bessel lens based on non-diffracting beam deflection on the metasurface, which solves the problem of complex structure and difficult integration in the prior art

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  • Metasurface-based non-diffractive beam deflection planar Bessel lens and method
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  • Metasurface-based non-diffractive beam deflection planar Bessel lens and method

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Embodiment Construction

[0029] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0030] A metasurface-based non-diffracting beam deflection planar Bessel lens, comprising a grounded dielectric floor 6, above which a feed source 1 and a planar plate lens are sequentially arranged along the forward propagation direction of the Bessel beam 2. The asymmetric gradient index lens 3, the ground medium floor 6 has a metal ground on the back;

[0031] The feed 1 is located on the transverse centerline of the grounded mediu...

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Abstract

The present invention provides a non-diffraction beam deflection plane Bessel lens based on a metasurface and a beam control method using the plane Bessel lens, including a grounded dielectric floor, and a beam above the grounded dielectric floor along the Bessel beam. In the forward propagation direction, a feed source, a flat plate lens, and an asymmetric gradient-refractive-index lens are arranged in turn. The lens converts the spherical wave radiated by the point source into a plane wave, and the asymmetric gradient index lens is used to emit the plane wave at a specific deflection angle, so that the overlapping area of ​​the beam is formed after passing through the asymmetric gradient index lens. The surface can not only form non-diffraction surface waves, but also can be expanded into a three-dimensional metamaterial lens to generate non-diffraction beams with a certain deflection angle. The invention has a simple structure and is easy to integrate.

Description

technical field [0001] The invention belongs to the field of non-diffraction antennas and relates to the design of metasurfaces, in particular to a plane Bessel lens based on metasurface-based beam deflection non-diffraction surface waves. Background technique [0002] A non-diffracting beam, that is, the beam does not diffract in the direction of propagation. It has many types, such as: Mathieu beam, Bessel beam, Vortex beam and so on. Among them, the Bessel beam is a special solution to the free-space wave equation. It has good characteristics such as small main lobe size, long focal depth, and good directivity. Compared with other beams, it is better in energy transmission, near-field detection, and high-resolution imaging. field has obvious advantages. At present, some achievements have been made in the research of Bessel non-diffracting beams in the optical, millimeter wave and microwave frequency bands. Many researchers have successively proposed Bessel non-diffract...

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Application Information

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IPC IPC(8): H01Q15/00H01Q15/02
CPCH01Q15/0013H01Q15/02
Inventor 卢萍黄卡玛杨阳
Owner SICHUAN UNIV