CN113629406A - Automobile radar ultra-wide spectrum wave absorber with magnetic patch - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
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Abstract
本发明公开一种带磁性贴片的汽车雷达超宽谱吸波体，包括金属背板，设置在所述金属背板上的若干阵列排布的吸波单元；所述吸波单元包括：5层吸波结构层、6层介质层、1层磁性贴片，相邻的6层介质层为叠层结构，相邻的两层介质层之间夹一层吸波结构层，5层吸波结构层与6层介质层形成吸波体，所述磁性贴片放置在金属背板层上，所述吸波体放置在磁性贴片上。本发明在低频段、中频、高频具有5个吸波耦合峰，形成1.6‑80GHz，50倍频、超宽吸波频带，且吸波材料对于角度依赖性低，入射角30度以内，吸波性能保持‑10dB以下。
The invention discloses an automotive radar ultra-wide spectrum wave absorber with a magnetic patch, comprising a metal backplane, and a plurality of wave-absorbing units arranged in an array arranged on the metal backboard; the wave-absorbing units include: 5 1 layer of absorbing structure layer, 6 layers of dielectric layer, 1 layer of magnetic patch, the adjacent 6 layers of dielectric layer are laminated structure, one layer of absorbing structure layer is sandwiched between two adjacent layers of dielectric layer, 5 layers of absorbing The structural layer and the six dielectric layers form a wave absorber, the magnetic patch is placed on the metal backplane layer, and the wave absorber is placed on the magnetic patch. The invention has 5 wave absorption coupling peaks in low frequency, medium frequency and high frequency, forming 1.6-80GHz, 50 frequency multiplication, ultra-wide wave absorption frequency band, and the wave absorption material has low angle dependence, and the incident angle is within 30 degrees, and the absorption Wave performance remains below ‑10dB.
Description
Technical Field
The invention relates to the technical field of metamaterials, in particular to an automobile radar ultra-wide spectrum wave absorber with a magnetic patch.
Background
With the rapid development of the electronic industry and the upgrade of the 5G communication technology, research and development and production tests of various basic devices related to 5G communication, such as base stations and antenna arrays, and various smart homes, mobile phones, hand rings, bluetooth headsets, automotive electronics, automatic driving radars and other products at present, are required to be performed in a specific clean electromagnetic environment, microwave darkrooms and radio darkrooms for research and development are generally available, 5G has been raised to 24GHz and 77GHz in a millimeter radar band at present, and professional and complete millimeter wave radar tests are a necessary way for research and development and offline of automatic driving automobiles, and meanwhile, the tests of 5G communication, vehicle-mounted intelligent devices and V2X in a finished automobile can be cooperated, so that the tests are necessary for manufacturers of future intelligent automobiles. A vehicle-mounted 5G millimeter wave radar and whole vehicle scene test system is indispensable for research and development and production line test of various large vehicle factories. And the current millimeter wave radar market is rapidly increased, the technology is rapidly updated, 77/79Hz millimeter wave long-distance radar is used for accelerating to replace a short-range radar, and the traditional civil wave-absorbing material cannot meet the requirements of increasingly-changed communication and electronic product research and development. Therefore, research and development of the 1.6-80GHz ultrahigh frequency ultra-wide spectrum wave-absorbing material are key points for promoting research and development, production and quality control of various high-precision field basic modules such as 5G communication, everything interconnection, intelligent driving and the like.
The wave-absorbing performance of the wave-absorbing material is improved by three main technologies, and on one hand, the good impedance matching characteristic of the wave-absorbing material and the incident end material is realized, so that electromagnetic energy enters the material as far as possible, and the interface reflection is reduced; secondly, the loss capacity of the interior of the material to electromagnetic waves is enhanced, so that the electromagnetic energy entering the interior of the material is quickly consumed; thirdly, the scattering effect of the material on the electromagnetic wave is enhanced, so that the action times of the electromagnetic wave and the material are increased, and the specific gravity of the electromagnetic wave reflected back along the incoming wave direction is reduced.
The existing structural wave-absorbing material can be formed by adding an absorbent into light materials such as foam and the like, and can realize broadband wave-absorbing by multilayer superposition, so that the structural wave-absorbing material has the advantages of light weight and broadband. But the thickness of the multi-layer wave-absorbing structure is generally thicker, the low-frequency wave-absorbing performance is poor, the occupied space is larger, and the overall mechanical property of the multi-layer bonding process is reduced; the typical wave absorbing screen can be formed by a foam surface loading resistive film, the thickness of the typical wave absorbing screen is one quarter of the wavelength of the central working frequency, the resistive film with a proper resistance is selected and made into a frequency selection surface pattern, and the working frequency band of the typical wave absorbing screen can be adjusted. Commonly used patterns are squares, crosses, square rings, etc. However, these patterns are limited by their own features, and only one absorption peak is present in the low frequency band (the frequency band with the thickness less than a quarter wavelength), so that it is difficult to achieve the ultra-wideband (1.5GHz-80GHz) wave-absorbing effect. Therefore, on the premise of not changing the material and the thickness of the wave absorber, the problem of expanding the whole low-frequency and high-frequency band absorption bandwidth of the wave absorber becomes a technical problem which needs to be solved urgently in the technical field of the current electromagnetic wave absorption.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the automobile radar ultra-wide spectrum absorber with the magnetic patch meets the wave absorbing requirement of ultra-wide band (1.5GHz-80GHz), and is convenient to apply to automobiles.
The technical scheme of the invention is as follows: the automobile radar ultra-wide spectrum wave absorber with the magnetic patch comprises a metal back plate and a plurality of wave absorbing units arranged in an array manner, wherein the wave absorbing units are arranged on the metal back plate; the wave absorbing unit comprises: the wave-absorbing structure comprises 5 wave-absorbing structure layers, 6 medium layers and 1 magnetic patch, wherein the 6 adjacent medium layers are of a laminated structure, one wave-absorbing structure layer is sandwiched between the two adjacent medium layers, the 5 wave-absorbing structure layers and the 6 medium layers form a wave-absorbing body, the magnetic patch is placed on a metal back plate layer, and the wave-absorbing body is placed on the magnetic patch; the dielectric constant of the dielectric layer is epsilon, epsilon is more than or equal to 0.8 and less than or equal to 3, the thickness is d, and d is more than or equal to 1mm and less than or equal to 10 mm; the wave-absorbing structure layer comprises: the square resistance of the annular resistor pattern is Rs which is not less than 50 omega/□ and not more than 1000 omega/□, the side length of an outer ring is L, the ring width is w, L is not less than 10mm and not more than 20mm, and w is not less than 3mm and not more than 5 mm; the period of the annular resistance patterns is a, namely the distance between the centers of the annular resistance patterns of two adjacent wave absorbing units is a, and a is more than or equal to 10mm and less than or equal to 20 mm; the points of the centers of the five layers of annular resistor patterns projected on the metal back plate are distributed in a circle with the diameter of 5 mm; the magnetic permeability of the magnetic patch is mu, the range of the mu is 0.25-6.9, and the thickness of the magnetic patch is 0.5-3 mm. The structural body of the invention forms 5 wave-absorbing coupling peaks in low frequency band, medium frequency and high frequency, the absorption is enhanced by mutual superposition, and the magnetic patches with outstanding low frequency wave-absorbing effect are superposed, thus forming good wave-absorbing effect of 1.6-80 GHz.
The wave-absorbing structure layer further comprises: the annular resistor pattern is arranged on the substrate thin film layer, and the thickness of the substrate thin film layer is 0.01mm-0.3 mm.
The centers of the five layers of annular resistor patterns are projected on the same point of the metal back plate.
The five annular resistor patterns are one or a combination of at least two of a square ring, a circular ring, a regular polygonal ring, a split ring and an irregular ring.
Five layers of the annular resistor patterns are as follows: the resistance paste is prepared from one or at least two of graphene, indium tin oxide, a polymer conductive material, graphite, acetylene black and carbon nanotubes; the six layers of dielectric layers are one or a combination of at least two of foamed polypropylene plates, foamed polystyrene plates, foamed polyvinyl chloride plates, corrugated boards, honeycomb material plates, light polymethacrylimide foam boards, FR4 glass fiber plates and F4B plates; the metal back plate is made of any one of gold or alloy thereof, silver or alloy thereof, copper or alloy thereof, iron or alloy thereof and aluminum or alloy thereof; the magnetic patch is a compound formed by carbonyl iron powder and/or iron-based metal alloy powder and/or nickel-based metal alloy powder and/or cobalt-based metal alloy powder and/or magnetic metal oxide and resin.
The substrate film layer is a polyimide film or a PET film; and the annular resistor pattern is printed on the substrate film layer in a silk-screen manner.
The metal back plate and the magnetic patch, the magnetic patch and the dielectric layer, the dielectric layer and the wave-absorbing structure layer, and the dielectric layer are bonded through the resin adhesive film layer.
The resin film layer is made of phenolic resin or epoxy resin or unsaturated polyester resin.
The resin film layer is added with a fiber reinforced material, and the fiber reinforced material adopts any one or the combination of at least two of glass fiber, carbon fiber, organic fiber and cotton.
The period a of the annular resistor pattern is 16mm, the thicknesses of 6 medium layers from inside to outside are respectively d 1-2 mm, d 2-2.5 mm, d 3-2.5 mm, d 4-2.5 mm, d 5-2 mm and d 6-2 mm, the dielectric constant epsilon of the 6 medium layers is 1.08, the square resistances of 5 annular resistor patterns from inside to outside are respectively Rs 1-650 Ω/□, Rs 2-950 Ω/□, Rs 3-600 Ω/□, Rs 4-350 Ω/□ and Rs 5-150 Ω/□, the outer circumferences of 5 annular resistor patterns from inside to outside are respectively 14.5mm, 11mm, 14mm and 12mm, the widths of 5 annular resistor patterns from inside to outside are respectively 14.5mm, 4mm and 4mm, and the side lengths of the magnetic patches are respectively 1mm, 4mm and 0 μ; the reflectivity is lower than-10 dB in the range of 1.6-80 GHz.
By adopting the scheme, the invention provides the automobile radar ultra-wide spectrum wave absorber with the magnetic patch, electromagnetic waves irradiate the automobile radar ultra-wide spectrum wave absorber, 5 wave absorbing structure layers are mutually coupled and superposed so as to fully absorb the electromagnetic waves, 1 magnetic patch is added at the bottom, the low-frequency absorption performance is enhanced, and the overall thickness is not more than 20 mm. The wave-absorbing material has 5 wave-absorbing coupling peaks at low frequency band, medium frequency and high frequency to form 1.6-80GHz, 50 frequency doubling and ultra-wide wave-absorbing frequency band, and has low angle dependence, incident angle within 30 degrees and wave-absorbing performance below-10 dB.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a dielectric layer and a wave-absorbing structure layer;
FIG. 3 is a diagram of the wave absorption performance of the simulation and the direct irradiation of the electromagnetic wave at 90 degrees according to an embodiment of the present invention;
fig. 4 is a wave-absorbing performance diagram of the embodiment in fig. 3 when electromagnetic waves with different incident angles are generated.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1-2, the invention provides an automobile radar ultra-wide spectrum absorber with a magnetic patch, which includes a metal back plate 10, and a plurality of wave absorbing units arranged in an array on the metal back plate 10; the wave absorbing unit comprises: the composite material comprises 5 wave-absorbing structure layers, 6 medium layers 20 and 1 magnetic patch 40, wherein the adjacent 6 medium layers 20 are of a laminated structure, one wave-absorbing structure layer is sandwiched between the two adjacent medium layers 20, the 5 wave-absorbing structure layers and the 6 medium layers 20 form a wave absorber, the magnetic patch 40 is placed on a metal back plate 10, and the wave absorber is placed on the magnetic patch 40; the dielectric constant of the dielectric layer 20 is epsilon, epsilon is more than or equal to 0.8 and less than or equal to 3, the thickness is d, and d is more than or equal to 1mm and less than or equal to 10 mm; the wave-absorbing structure layer comprises: the square resistance of the annular resistor pattern 30 is Rs which is not less than 50 omega/□ and not more than 1000 omega/□, the side length of an outer ring is L, the ring width is w, L is not less than 10mm and not more than 20mm, and w is not less than 3mm and not more than 5 mm; the period of the annular resistance pattern 30 is a, that is, the distance between the centers of the annular resistance patterns 30 of two adjacent wave absorbing units is a, and a is greater than or equal to 10mm and less than or equal to 20 mm; the points of the centers of the five layers of annular resistor patterns 30 projected on the metal back plate 10 are distributed in a circle with the diameter of 5 mm; the magnetic permeability of the magnetic patch 40 is mu, the range of the mu is 0.25-6.9, and the thickness of the magnetic patch 40 is 0.5-3 mm.
The wave-absorbing structure layer further comprises: the annular resistor pattern 30 is arranged on the substrate thin film layer 50, and the thickness of the substrate thin film layer 50 is 0.01mm-0.3 mm.
The centers of the five layers of annular resistor patterns 30 are projected on the same point of the metal back plate 10.
The five layers of annular resistor patterns 30 are one or a combination of at least two of square rings, circular rings, regular polygonal rings, split rings and irregular rings.
The five layers of annular resistor patterns 30 are made of resistor slurry containing one or at least two of graphene, indium tin oxide, polymer conductive materials, graphite, acetylene black and carbon nanotubes; the six layers of the medium layers 20 are one or a combination of at least two of foamed polypropylene plates, foamed polystyrene plates, foamed polyvinyl chloride plates, corrugated boards, honeycomb material plates, light polymethacrylimide foam boards, FR4 glass fiber plates and F4B plates; the metal back plate 10 is made of any one of gold or an alloy thereof, silver or an alloy thereof, copper or an alloy thereof, iron or an alloy thereof, and aluminum or an alloy thereof; the magnetic patch 40 is a composite of carbonyl iron powder and/or iron-based metal alloy powder and/or nickel-based metal alloy powder and/or cobalt-based metal alloy powder and/or magnetic metal oxide and resin.
The substrate film layer 50 is a polyimide film or a PET film; the annular resistor pattern 30 is silk-screened onto the substrate film layer 50.
The metal back plate 10 and the magnetic patch 40, the magnetic patch 40 and the dielectric layer 20, the dielectric layer 20 and the wave-absorbing structure layer, and the dielectric layer 20 are bonded through resin adhesive film layers.
The resin film layer is made of phenolic resin or epoxy resin or unsaturated polyester resin.
The resin film layer is added with a fiber reinforced material, and the fiber reinforced material adopts any one or the combination of at least two of glass fiber, carbon fiber, organic fiber and cotton.
Referring to fig. 3 and 4, in the present embodiment, the annular resistive pattern is a square ring, the period a of the annular resistive pattern 30 is 16mm, the thicknesses of the 6 dielectric layers 20 from the inside to the outside are d 1-2 mm, d 2-2.5 mm, d 3-2.5 mm, d 4-2.5 mm, d 5-2 mm, and d 6-2 mm, respectively, the dielectric constants of the 6 dielectric layers 20 are ∈ 1.08, the sheet resistances of the 5 annular resistive patterns 30 from the inside to the outside are Rs 1-650 Ω/□, Rs 2-950 Ω/□, Rs 3-600 Ω/□, Rs 4-350/□, Rs 5-150/□, the outer circumferences of the 5 annular resistive patterns 30 from the inside to the outside are 14.5mm, Rs 12mm, and the widths of the annular resistive patterns 30 from the inside to the outside are 14mm, 4mm, and the widths of the annular resistive patterns are respectively 6mm, 4mm, and the widths of the inner and the outer are 14mm, 4mm, respectively, and the widths of the annular resistive patterns 30 mm are 1.5 mm, and 4mm, and the widths of the inner and the widths of the 6mm are respectively, The thickness is 1 mm; the reflectivity is lower than-10 dB in the range of 1.6-80 GHz.
As can be seen from fig. 3, in the present embodiment, based on the square ring-shaped resistive film and the magnetic patch 40, the wave-absorbing property with reflectivity lower than-10 dB can be achieved within a range of 1.6-80GHz, and thus, by reasonably selecting the surface resistance and the structural parameters of the resistive film, 5 groups of wave-absorbing peaks at low frequency, medium frequency and high frequency are achieved, and the low-frequency absorption intensity is enhanced, so that the overall wave-absorbing bandwidth is widened. Where TE is the actual test and TM is the simulation.
As can be seen from fig. 4, in the present embodiment, based on the isotropy of the square-ring-shaped geometric structure, within 30 degrees of the incoming wave direction of the electromagnetic wave, the electromagnetic wave maintains the ultra-wide and ultra-strong absorption characteristics, and the ultra-wide and ultra-wide wave absorber of 1.6 to 80GHz is implemented.
In summary, the invention provides an automobile radar ultra-wide spectrum absorber with a magnetic patch, electromagnetic waves irradiate on the automobile radar ultra-wide spectrum absorber, 5 layers of wave absorbing structure layers are mutually coupled and overlapped, so that the electromagnetic waves are fully absorbed, 1 layer of magnetic patch is added at the bottom, the low-frequency absorption performance is enhanced, and the overall thickness is not more than 20 mm. The wave-absorbing material has 5 wave-absorbing coupling peaks at low frequency band, medium frequency and high frequency to form 1.6-80GHz, 50 frequency doubling and ultra-wide wave-absorbing frequency band, and has low angle dependence, incident angle within 30 degrees and wave-absorbing performance below-10 dB.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
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| CN202111064208.6A CN113629406A (en) | 2021-09-10 | 2021-09-10 | Automobile radar ultra-wide spectrum wave absorber with magnetic patch |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389052A (en) * | 2022-02-28 | 2022-04-22 | 深圳市佳晨科技有限公司 | Arbitrary polarization three-dimensional broadband wave absorber and preparation method thereof |
| CN115832720A (en) * | 2022-12-20 | 2023-03-21 | 北京环境特性研究所 | An ultra-broadband high-performance absorbing structure |
| CN116111364A (en) * | 2023-03-28 | 2023-05-12 | 南昌大学 | Ultra-wideband coherent perfect absorber with terahertz wave band based on graphene super surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724856A (en) * | 2012-06-06 | 2012-10-10 | 电子科技大学 | Multi-layer electromagnetic wave absorbing structure and preparation method thereof |
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| CN115832720A (en) * | 2022-12-20 | 2023-03-21 | 北京环境特性研究所 | An ultra-broadband high-performance absorbing structure |
| CN116111364A (en) * | 2023-03-28 | 2023-05-12 | 南昌大学 | Ultra-wideband coherent perfect absorber with terahertz wave band based on graphene super surface |
| CN116111364B (en) * | 2023-03-28 | 2024-03-29 | 南昌大学 | Ultra-broadband coherent perfect absorber based on graphene metasurface in terahertz band |
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