Wide-angle retroreflector based on secondary aspheric surface super-structure lens and preparation method of wide-angle retroreflector

An aspheric, reflector technology, applied in antennas, electrical components, etc., can solve the problems of low retroreflection efficiency and small angular response range, and achieve high retroreflection efficiency, large angular response range, and improved efficiency and convenience. Effect

Pending Publication Date: 2022-03-01
NANJING UNIV OF SCI & TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of the above two methods have the disadvantages of small angular response range and low retroreflection efficiency at large angles of incidence

Method used

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  • Wide-angle retroreflector based on secondary aspheric surface super-structure lens and preparation method of wide-angle retroreflector
  • Wide-angle retroreflector based on secondary aspheric surface super-structure lens and preparation method of wide-angle retroreflector
  • Wide-angle retroreflector based on secondary aspheric surface super-structure lens and preparation method of wide-angle retroreflector

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preparation example Construction

[0029] The present invention is based on the preparation method of the wide-angle retroreflector of secondary aspherical metalens, comprising the following steps:

[0030] Step 1. Construct the superstructure unit, and then adjust the relative phase delay between the superstructure units by changing the radius value and height value of the superstructure unit;

[0031] Step 2. Determine the numerical aperture of the quadratic aspheric metalens and the value is greater than or equal to 0.8, and arrange the array according to the equiphase planes required to be generated by the quadratic aspheric metalens;

[0032] Step 3, the thickness of the substrate is set to the focal length of the secondary aspheric metalens, and a plane reflection layer is set at the focal plane of the secondary aspheric metalens to form a retroreflector;

[0033]Step 4. Under the condition that the transmission coefficient of the uniform periodic array corresponding to the selected meta-unit is greater t...

Embodiment 1

[0054] In order to further improve the angular response range and retroreflection efficiency of the planar retroreflector, the present invention introduces a secondary aspheric meta-lens and a flat reflective layer, and realizes a retroreflector capable of reaching a 120° angular response range at 77GHz, and The corresponding retroreflection efficiency at the maximum incident angle (ie 60°) is 32.73%.

[0055] 1. Superstructure unit design

[0056] Construct a superstructure unit working at a frequency of 77GHz, and the unit structure is selected to be wrapped in a resin material (refractive index n 2 =1.5) in MgO-TiO 2 (refractive index n 1 =4) Cylindrical waveguides of materials, such as figure 2 As shown in (a), the construction requirements are: make the meta-unit corresponding to the uniform periodic array meet the conditions that the transmission coefficient is greater than 75% and the phase control range reaches 0-2π at the frequency of 77GHz.

[0057] 2. Generate ...

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Abstract

The invention discloses a wide-angle retroreflector based on a secondary aspheric surface super-structure lens and a preparation method of the wide-angle retroreflector. The retroreflector comprises a substrate, a layer of secondary aspheric surface super-structure lens arranged on the upper surface of the substrate, and a plane reflecting layer arranged on the lower surface of the substrate. The preparation method comprises the following steps: arranging an array according to an equiphase surface which needs to be generated by the secondary aspheric surface super-structure lens; a plane reflecting layer is arranged at the focal plane of the secondary aspheric surface super-structure lens; and under the conditions that the transmission coefficient of the uniform periodic array corresponding to the selected superstructure unit is greater than 0.75 and the phase regulation reaches 0-2pi, adjusting the parameters of the superstructure unit, calculating the average retroreflection efficiency of the retroreflector formed by the superstructure units with different periods and heights within the retroreflection range of 0-120 degrees, and calculating the average retroreflection efficiency of the retroreflector formed by the superstructure units with different periods and heights within the retroreflection range of 0-120 degrees. And determining the unit height and the period when the average retroreflection efficiency is the highest, and obtaining the final wide-angle retroreflector. According to the invention, a larger working angle range and higher retroreflection efficiency are realized.

Description

technical field [0001] The invention belongs to the technical field of front-end devices in wireless communication, in particular to a wide-angle retroreflector based on a quadratic aspheric metalens and a preparation method thereof. Background technique [0002] A retroreflector is a device that can reflect electromagnetic wave signals along its incident direction. Traditional retroreflectors include Lumber lenses, corner reflectors, and cat's eye retroreflectors. Among them, Longbo lens can achieve retroreflection in the range of nearly 180°, that is, all possible incident / reflected rays are in a cone with a vertex angle of 180° and the axis is the symmetry axis of the device, but it requires more complicated processing technology to achieve Refractive index gradient inside the device. Corner reflectors use three mutually perpendicular right-angle surfaces to achieve retroreflection. Due to their simple manufacture, they are widely used in marking land and sea targets su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01Q15/23
CPCH01Q15/0086H01Q15/23H01Q15/0046
Inventor 俞叶峰索虹飞丁继根廖轶明
Owner NANJING UNIV OF SCI & TECH
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