Orbital angular momentum plane spiral phase plate based on phase shift surface

An orbital angular momentum, helical phase plate technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problems of large receiving end, large receiving radius, and high cost, and achieve small size, low cost, and light weight. Effect

Active Publication Date: 2015-12-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After long-distance transmission, the divergence of the orbital angular momentum beam requires a large receiving radius at the receiving end, resulting in an excessively large receiving end and high cost

Method used

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  • Orbital angular momentum plane spiral phase plate based on phase shift surface
  • Orbital angular momentum plane spiral phase plate based on phase shift surface
  • Orbital angular momentum plane spiral phase plate based on phase shift surface

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Embodiment

[0030] The planar phase shift unit structure designed in this patent, the working frequency is set at 60GHz, the side length of the unit is 2mm, and it includes four layers of media. figure 2 (a) is indicated by the slash texture, and the rest are 5 layers of metal layers. The middle metal layer is the size of the dielectric unit, and there is a slit in the center. The size of the slit will also affect the phase shift. Here, to ensure the phase shift and For loss requirements, the slit size is 1.5mm on the long side and 0.3mm wide; the patch layers are all the same size except the middle layer, and the phase shift amount is changed according to the patch size. Each patch of 8 different unit structures Dimensions are listed below. The overall structure contains a total of 30×30 unit structures.

[0031] Unit patch size

[0032]

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Abstract

The invention discloses an orbital angular momentum plane spiral phase plate based on a phase shift surface. Based on the multilayered medium phase shift surface principle, multiple phase shift units are designed to synthesize a plane lens so that the spiral phase plate can be formed, and meanwhile one-order orbital angular momentum wave beams are generated and focused; each phase shift unit comprises multiple medium layers and metal layers, wherein the medium layers and the metal layers are alternately arranged; the metal layers are divided into intermediate metal layers and patch layers, the intermediate metal layers and the medium layers are the same in size, and slits are formed right in the middle; the multiple different phase shift units form a spiral array, specifically, phase compensation of the plane lens for spherical waves and phase shift of the spiral phase plate are superposed based on the phase superposition principle, and the spiral phase plate with the orbital angular momentum wave beam converging function is obtained. The plane spiral phase plate manufactured in a printed circuit board mode is small in size, low in weight and cost, simple in preparation process and free of complex antenna structures.

Description

technical field [0001] The invention belongs to the technical field of orbital angular momentum communication, and in particular relates to the emission of orbital angular momentum mode beams, in particular to an orbital angular momentum plane spiral phase plate based on a phase shift surface, which is used for the emission and convergence of orbital angular momentum beams to realize communication over long distances. Background technique [0002] With the rapid development of mobile technology, the demand for electromagnetic spectrum resources has expanded rapidly, making electromagnetic spectrum resources increasingly scarce and their limitations increasingly prominent. It is becoming more and more urgent to develop new theories and technologies to obtain higher spectrum utilization efficiency. The research on applying electromagnetic beams with orbital angular momentum (OAM) to communication has aroused great attention. Improving communication capacity by expanding the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/18H01Q15/02G02B5/30
Inventor 陈弋凌李越回晓楠郑史烈章献民
Owner ZHEJIANG UNIV
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