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Geometric phase metasurface applied to broadband multi-mode vortex wave beam generation

A beamforming and metasurface technology, applied in electrical components, antennas, etc., to achieve the effect of easy implementation and convenient processing

Inactive Publication Date: 2019-02-01
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the invention is to solve the bandwidth problem of traditional metasurfaces, and simultaneously generate multiple modes of vortex beams in a wide frequency band

Method used

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  • Geometric phase metasurface applied to broadband multi-mode vortex wave beam generation
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  • Geometric phase metasurface applied to broadband multi-mode vortex wave beam generation

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] A geometric phase metasurface applied to broadband multi-mode vortex beam formation, the basic unit structure is characterized in that: from top to bottom, there are metal rod layer, microwave dielectric layer and metal back plate layer.

[0040] According to the corresponding frequency band, select the corresponding metal. In this application, copper is selected for the frequency band, that is, copper rods and copper backplanes are used. If it corresponds to other frequency bands, other metals such as gold or aluminum can also be selected.

[0041] Such as figure 1 As shown, a Cartesian coordinate system is established first, the x-axis is along the length direction of the medium layer, the y-axis is along the width direction of the medium layer, and the z-axis is along the height direction of the medium layer.

[0042] The metal rod layer rotates at a certa...

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Abstract

The invention discloses a geometric phase metasurface applied to broadband multi-mode vortex wave beam generation. A basic unit of the metalsurface is composed of a metal rod structure, a dielectric layer and a metal backboard stacked successively from top to bottom. The unit is anisotropic via special structural design, and the reflection phase difference is 180 degree under x and y polarized electromagnetic wave irradiation. A metal rod rotates for an angle phi within the horizontal plane of the metasurface by taking the center of the metal rod itself as the origin, and circular polarized incident waves irradiated on the unit is reflected to obtain circular polarized waves with the same rotation performance plus an additional + / - 2phi geometric phase change. The units are arranged in a 2D plane according to preset phase distribution, and under irradiation of the circular polarized electromagnetic waves, the metasurface can generate four different modes of vortex wave beams in different directions. The metasurface is simple in structure, easy to process and wide in working frequency band, and can be used for information coding, and the channel capacity can be improved by mode multiplexing.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic materials, and in particular relates to a geometric phase metasurface applied to the formation of broadband multimode vortex beams. Background technique [0002] Electromagnetic metamaterials (Metamaterials), also known as new artificial electromagnetic materials, is an artificial material composed of macroscopic basic units with specific geometric shapes arranged periodically / aperiodically, or implanted into the body (or surface) of the matrix material. . The difference between electromagnetic metamaterials and traditional materials is that the original microscopic units (atoms or molecules) are replaced by macroscopic units. In the past 20 years, electromagnetic metamaterials have developed rapidly, resulting in many interesting physical phenomena and novel devices. The difference between electromagnetic metamaterials and traditional materials is that the original microscopic un...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
CPCH01Q15/0006H01Q15/0013
Inventor 崔铁军张磊申佳琳陈晓晴
Owner SOUTHEAST UNIV
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