CN210430119U - Single-layer millimeter wave absorption plate - Google Patents
Single-layer millimeter wave absorption plate Download PDFInfo
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- CN210430119U CN210430119U CN201921672483.4U CN201921672483U CN210430119U CN 210430119 U CN210430119 U CN 210430119U CN 201921672483 U CN201921672483 U CN 201921672483U CN 210430119 U CN210430119 U CN 210430119U
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- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a monolayer millimeter wave absorbing plate, including flat-plate absorbing material (1) one side is still that dot-matrix distributes there are a plurality of archs (2). Preferably, the protrusions (2) are hemispherical. The utility model discloses a millimeter wave absorption panel, absorption frequency bandwidth, light in weight, thickness are little, with low costs.
Description
Technical Field
The utility model belongs to the technical field of absorbing material, especially a single-layer millimeter wave absorption panel that absorption frequency bandwidth, light in weight, thickness are little, with low costs.
Background
The absorbing material can absorb or greatly weaken the electromagnetic wave energy projected to the surface of the absorbing material, and is widely applied to the fields of electromagnetic compatibility, stealth technology and the like. In engineering application, the material not only requires high absorption rate to electromagnetic waves in a wider frequency band, but also has the use requirements of light weight, thin thickness, temperature resistance, corrosion resistance and the like. Classified according to the shape of the absorbent material, it can be classified into: pyramid wedge shapes, single or multi-layer flat shapes, coating shapes, structural configurations, and the like, typically applied as: the device comprises a microwave darkroom pyramid wedge absorbing material, a patch type absorbing material, radar stealth paint and a honeycomb type structure absorbing material. The millimeter wave absorbing material is an absorbing material having a high absorption rate and a low reflectance for electromagnetic waves in a millimeter wave band.
At present, most of researches on millimeter wave absorbing materials are focused on the absorbing materials with multilayer structures, and the impedance matching characteristics of the absorbing materials are optimized mainly through the design of the multilayer structures, so that the absorbing performance of the absorbing materials is improved. But has the problems of complex process, strict requirements on the performance of the absorbent, non-ideal absorption frequency band and the like. If ZL93102922.8 adopts multilayer coating structure, adopts broadband matching principle of impedance gradual change to carry out optimization design, and the coating is mixed by a plurality of absorbents and adhesives and is coated in eight layers; ZL201110302218.9 and ZL201110302144.9 are compounded by adopting five-layer medium coatings. ZL201820447780.8 adopts multilayer non-woven fabrics as the basic unit design absorbing material. ZL201410008943.9 adopts the compound wave absorbing agent to be composed of carbon nano tubes, nano tin antimony oxide and barium ferrite, and realizes high absorption rate.
The shape and the structural surface of the wave-absorbing material are mainly in a pyramid structure or a honeycomb structure to improve the electromagnetic wave absorption effect. But has the problems of large weight and thickness, small application range and the like, and the pyramid-shaped wave-absorbing material is mainly used for a microwave darkroom. For example, ZL201120046377.2 adopts polyurethane foam pyramid wave-absorbing material, the upper part is of a regular quadrangular pyramid structure, and the lower part is of a cuboid base. ZL20122018444.9 used a pyramid absorber comprising a pyramid shaped mold and a base.
In summary, the prior art has the following problems: the millimeter wave absorption plate has narrow absorption frequency band, heavy weight and large thickness, and has high cost due to high process requirement and expensive absorbent.
Disclosure of Invention
An object of the utility model is to provide a monolayer millimeter wave absorption panel, absorption frequency bandwidth, light in weight, thickness are little, with low costs.
Realize the utility model discloses the technical solution of purpose does:
a single-layer millimeter wave absorption plate comprises a flat-plate-shaped wave absorption material 1, wherein a plurality of protrusions 2 are distributed on one side of the flat-plate-shaped wave absorption material 1 in a dot matrix manner.
Preferably, the protrusions 2 are hemispherical.
Compared with the prior art, the utility model, it is showing the advantage and is:
1. wide absorption band:
the coating wave-absorbing material adopts an interference principle to enable reflected waves on the surface of a material-metal and reflected waves on the surface of an air-material to be offset due to phase inversion, and the phase is influenced by the thickness of the material, the concentration of an absorbent and the frequency, so that when the thickness of the material and the concentration of the absorbent are given, the optimal absorption frequency is correspondingly determined. When the frequency shifts, the phase inversion relationship is broken, and therefore, the absorption characteristics deteriorate. The material adopts the surface hemispherical convex structure on the basis of the bottom wave-absorbing coating, and not only the interference action mechanism of the bottom wave-absorbing coating, but also the scattering action of the surface convex structure on incident millimeter waves, so that the millimeter waves are reflected for multiple times between the hemispherical convex structure and the surface, and the multiple absorption effect is enhanced.
2. The cost is low:
compared with a multilayer wave-absorbing material, in order to expand the absorption frequency bandwidth, the absorbent is usually specially designed and prepared, and process parameters such as the concentration and the thickness of the absorbent are strictly controlled so as to realize high absorption performance. The absorption material adopts a mode of combining a surface structure convex structure and a bottom layer material to improve the absorption performance by the surface structure, thereby reducing the strict requirements on the preparation process of the absorbent and the material, and being prepared by adopting the absorbent with low cost.
3. Light weight, small thickness:
compared with the thickness of a common pyramid-shaped absorbing material which is dozens of centimeters, the integral thickness of the absorbing material is not more than 3 centimeters and the weight is light because the mode of combining the bottom layer absorbing material and the surface structure is adopted.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of the single-layer millimeter wave absorbing plate of the present invention.
Fig. 2 is a side view of fig. 1.
Fig. 3 is a reflection attenuation curve of the bottom flat plate material of the millimeter wave absorbing plate in the embodiment.
Fig. 4 is a reflection attenuation curve diagram of the millimeter wave absorbing plate in the embodiment.
In the figure, 1 flat-plate-shaped wave-absorbing material and 2 hemispherical bulges.
Detailed Description
As shown in figure 1, the millimeter wave absorbing plate comprises a flat-plate-shaped wave absorbing material 1, wherein a plurality of bulges 2 are distributed on one side of the flat-plate-shaped wave absorbing material 1 in a dot-matrix manner.
Preferably, the protrusions 2 are hemispherical.
Preferably, the flat-plate-shaped wave-absorbing material 1 is a single-layer uniform absorbing material with the concentration of the absorbent in the resin matrix kept unchanged.
The flat-plate-shaped wave-absorbing material 1 adopts a single-layer uniform absorbing material with the concentration of the absorbent in the resin matrix kept unchanged, so that the process difficulty can be greatly reduced, the yield can be improved, and the production cost can be reduced.
Preferably, the hemispherical bulge 2 and the flat-plate-shaped wave-absorbing material 1 are made of the same wave-absorbing material.
The hemispherical bulges 2 and the flat-plate-shaped wave-absorbing material 1 are made of the same wave-absorbing material, namely the same resin matrix example and the same absorbent type and concentration are adopted, so that the difficulty of the preparation process is reduced, the yield is improved, and the production cost is further reduced.
The present invention will be further described with reference to the following specific examples.
A millimeter wave absorbing plate comprises a flat-plate-shaped wave absorbing material 1, wherein a plurality of hemispherical protrusions 2 are distributed on one side of the flat-plate-shaped wave absorbing material 1 in a dot-matrix manner.
The typical thickness of the bottom layer flat-plate-shaped wave-absorbing material 1 is 0.5-1.5 mm. Conductive or magnetic absorbents such as carbonyl iron, ferrite, carbon nanotubes, graphene, conductive carbon black, silicon carbide, carbon fibers, iron fibers, magnetic fibers, and the like; the absorbent material base may be made of resin such as epoxy resin, polyester resin, polyurethane resin, acrylic resin, rubber resin, or the like; polyurethane foams or sponges may also be used.
The surface lattice type convex structure is a hemispherical structure, and lattice type is periodically distributed on the surface of the bottom material. The raised structure is made of the same base material and the same absorbent type and concentration as the bottom layer. The typical radius of the hemispherical convex structures is 0.5-1 cm, the typical distance between adjacent hemispherical convex structures is 1-2 cm, and the transverse distance and the longitudinal distance of the dot matrix are the same.
The process for preparing the convex hemispherical structure on the surface can firstly prepare a lattice hemispherical concave cavity mould, the structural parameters and the spacing parameters of the concave hemispherical cavity are the same as those of the convex hemispherical structure, and the pre-prepared resin absorbing material in a flowing state is poured into a prefabricated mould and is solidified and demoulded to prepare the convex hemispherical structure.
For verifying the utility model discloses an validity adopts standard arch-shaped frame method test absorbing material's millimeter wave reflection decay, will receive and dispatch antenna vertical alignment material platform that awaits measuring.
Firstly, testing the millimeter wave reflected signal power of a standard multi-metal aluminum plate, then placing an absorbing material on a metal plate, and comparing the millimeter wave reflected signal power measured again with the reflected signal power of the standard plate to obtain the attenuation value of the absorbing material.
Data using a single layer bottom sheet material is shown in figure 3.
The utility model discloses hemispherical protruding type millimeter wave absorbent material's of surface dot-matrix data is as shown in figure 4.
As can be seen from the test curve in FIG. 3, the single-layer wave-absorbing material has larger attenuation at some frequency points, but the absorption performance is reduced along with the change of frequency. Can see from figure 4 test curve, the utility model discloses hemispherical protruding type millimeter wave absorbing material reflection attenuation of surface dot-matrix all exceeds 14dB at the decay of 26 ~ 40GHz frequency range, and the absorption frequency bandwidth is showing and is promoting, and has the advantage of thickness thin light in weight.
Claims (4)
1. The utility model provides a single-deck millimeter wave absorption panel, includes flat absorbing material (1), its characterized in that:
a plurality of bulges (2) are distributed on one side of the flat wave-absorbing material (1) in a lattice manner.
2. The millimeter wave absorbing sheet according to claim 1, wherein:
the bulges (2) are hemispherical.
3. The millimeter wave absorbing sheet according to claim 1, wherein:
the flat-plate-shaped wave-absorbing material (1) is a single-layer uniform absorbing material with the concentration of an absorbent in a resin matrix kept unchanged.
4. The millimeter wave absorbing sheet according to any one of claims 1 to 3, characterized in that:
the bulges (2) and the flat-plate-shaped wave-absorbing material (1) are made of the same wave-absorbing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921672483.4U CN210430119U (en) | 2019-10-09 | 2019-10-09 | Single-layer millimeter wave absorption plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921672483.4U CN210430119U (en) | 2019-10-09 | 2019-10-09 | Single-layer millimeter wave absorption plate |
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| Publication Number | Publication Date |
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| CN210430119U true CN210430119U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921672483.4U Active CN210430119U (en) | 2019-10-09 | 2019-10-09 | Single-layer millimeter wave absorption plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675618A (en) * | 2021-08-19 | 2021-11-19 | 太原理工大学 | Ultra-wideband terahertz absorption material with double truncated pyramid structure and absorber |
-
2019
- 2019-10-09 CN CN201921672483.4U patent/CN210430119U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675618A (en) * | 2021-08-19 | 2021-11-19 | 太原理工大学 | Ultra-wideband terahertz absorption material with double truncated pyramid structure and absorber |
| CN113675618B (en) * | 2021-08-19 | 2023-11-14 | 太原理工大学 | Ultra-wideband terahertz absorbing material with double truncated pyramid structure and absorber |
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