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Metamaterial wave-absorbing structure applied to millimeter wave radar, and vehicle antenna thereof

A technology of millimeter-wave radar and metamaterials, which is applied to antennas, antennas, and antenna parts suitable for movable objects. The number of layers of splitting structure is too many to achieve good absorbing effect, good absorbing performance and reduce multipath effect

Pending Publication Date: 2021-12-03
DONGFENG MOTOR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In March 2021, the Ministry of Industry and Information Technology plans to use the 76-79GHz frequency band for automotive radar. In 2024, the production or import of 24.25-26.65GHz frequency band automotive radar equipment sold in China will be stopped. The absorbing structure of the existing millimeter-wave radar is only suitable for relatively Narrow existing frequency band, unable to achieve good absorbing effect in the 76-79GHz frequency band
However, the number of layers of the wedge structure in this patent is large, resulting in a thicker thickness of the wedge structure in the longitudinal direction, and the wedge structure can only be applied in open places, which limits the application of the structure in the car
Moreover, the larger the incident angle of the general wave, the worse the absorbing performance.

Method used

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  • Metamaterial wave-absorbing structure applied to millimeter wave radar, and vehicle antenna thereof
  • Metamaterial wave-absorbing structure applied to millimeter wave radar, and vehicle antenna thereof
  • Metamaterial wave-absorbing structure applied to millimeter wave radar, and vehicle antenna thereof

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Embodiment 1

[0031] Such as Figure 1-3 As shown, the present invention provides a metamaterial wave-absorbing structure applied to millimeter-wave radar, which includes a plurality of square wave-absorbing units arranged periodically and closely in the horizontal direction. The metal reflective layer 1, the first dielectric layer 2, the supersurface layer, and the second dielectric layer 3 are placed, and the metal reflective layer 1, the first dielectric layer 2, and the second dielectric layer 3 are all square sheets with a side length of p, Edges of the metal reflective layer 1 , the first dielectric layer 2 , and the second dielectric layer 3 are vertically aligned.

[0032] The supersurface layer comprises two large circular wave-absorbing sheets 4 and two small circular wave-absorbing sheets 5, and the two large circular wave-absorbing sheets 4 are arranged at a pair of corners on the first dielectric layer 2 ( figure 2 middle upper left corner and lower right corner), two small c...

Embodiment 2

[0037] In this embodiment, except for the following features, the absorbing structure is exactly the same as that of Embodiment 1:

[0038] The material of the metal reflection layer 1 is copper, and the thickness of the metal reflection layer 1 is t=0.015mm. Both the first dielectric layer 2 and the second dielectric layer 3 are made of polyvinyl fluoride, and both have a dielectric constant of 2.3. The thickness h1 of the first dielectric layer 2 and the thickness h2 of the second dielectric layer 3 are the same, h1=h2=1.0mm. The side length p is 20 mm, the radius r1 of the large circular wave-absorbing sheet 4 = 4.7 mm, and the radius r2 of the small circular wave-absorbing sheet 5 = 3.9 mm. The material of the supersurface layer is indium tin oxide, and the square resistance of the supersurface layer is 110Ω / m 2 . When multiple absorbing units are arranged horizontally and periodically, they are closely arranged along the X-axis direction and the Y-axis direction to for...

Embodiment 3

[0041] In this embodiment, except for the following features, the absorbing structure is exactly the same as that of the embodiment:

[0042] The material of the metal reflection layer 1 is copper, and the thickness of the metal reflection layer 1 is t=0.018mm. Both the first dielectric layer 2 and the second dielectric layer 3 are made of polylactic acid, and the dielectric constants are both 2.2. The thickness h1 of the first dielectric layer 2 and the thickness h2 of the second dielectric layer 3 are the same, h1=h2=0.8mm. The side length p is 19.8mm, the radius r1 of the large circular absorbing sheet 4 is 4.8mm, and the radius of the small circular absorbing sheet 5 is r2=4.2mm. The material of the supersurface layer is indium tin oxide, and the square resistance of the supersurface layer is 90Ω / m 2 . When multiple absorbing units are arranged horizontally and periodically, they are closely arranged along the X-axis direction and the Y-axis direction to form a matrix. ...

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Abstract

The invention discloses a metamaterial wave-absorbing structure applied to a millimeter wave radar, and a vehicle antenna thereof. The wave-absorbing structure comprises a plurality of square wave-absorbing units which are periodically and tightly arranged in the horizontal direction, each wave-absorbing unit comprises a metal reflecting layer, a first dielectric layer, a metasurface layer and a second dielectric layer which are sequentially stacked from bottom to top, the metal reflecting layer, the first dielectric layer and the second dielectric layer are all in a square sheet shape with the side length being p, the metasurface layer comprises two large circular wave absorbing plates and two small circular wave absorbing plates, the distance between the circle center of each large circular wave absorbing plate and the two sides of the corresponding right angle on the first dielectric layer is p / 4, and the distance between the circle center of the small circular wave absorbing plate and the two sides of the corresponding right angle on the first dielectric layer is p / 4. The wave-absorbing structure can reduce the back scattering waveform of the antenna, so that when the radar is installed in a vehicle, the wave-absorbing structure absorbs the back scattering wave of the radar, the multipath effect of the radar is reduced, and the working efficiency of the radar is improved.

Description

technical field [0001] The invention relates to special functional materials, in particular to a metamaterial wave-absorbing structure applied to millimeter-wave radar and its vehicle antenna. Background technique [0002] With the development of automotive intelligent network technology, the application of millimeter-wave radar in automobiles is becoming more and more important. Installing millimeter-wave radar on the car plays the role of the "eye" of the car, so that it can measure from the radar to the measured The distance, angle and relative speed between objects, etc. [0003] Due to the complex installation environment of the millimeter-wave radar, the radar waves emitted by the millimeter-wave radar will be reflected many times in the car. The multipath effect of the radar wave will affect the radar receiving system's judgment on the target. Therefore, it is recommended to place a wave-absorbing material behind the radar method can greatly solve this problem. Meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01Q17/00H01Q1/32
CPCH01Q15/0086H01Q17/008H01Q1/3233
Inventor 夏云王斌
Owner DONGFENG MOTOR GRP
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