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Wide-frequency-range wave absorbing material

A wave-absorbing material and wide-frequency domain technology, which is applied in the field of wide-frequency-domain wave-absorbing materials, can solve the problems of narrow frequency band, low efficiency, dielectric parameters and magnetic permeability are difficult to meet the requirements of no reflection, and achieve the effect of high-efficiency absorption

Inactive Publication Date: 2016-11-23
福建星宏新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The wave absorbing agents in the prior art mainly include ferrite wave absorbing materials, carbon fiber structure wave absorbing materials, nano wave absorbing materials, polycrystalline iron fiber wave absorbing materials and conductive high polymer wave absorbing materials, etc., but these wave absorbing materials It is difficult to meet the requirement of non-reflection in a wide frequency band due to its dielectric parameters and magnetic permeability. There are many shortcomings such as narrow frequency band, only absorption in frequency bands below 20 GHz, low efficiency, and high density. Its application range is limited to a certain extent. The absorbing performance of the absorbing material made from it is not good

Method used

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Embodiment 1

[0033] Refer to attached figure 1 , a wide frequency domain absorbing material, comprising a substrate 1, the substrate 1 has a plurality of micro-carbon coils 2, the micro-carbon coils 2 account for 0.5%-10% of the total weight of the microwave-absorbing material, and the micro-carbon coils 2 have a One or more sizes to achieve the absorption effect of electromagnetic waves in different frequency domains, specifically, the micro-carbon coil 2 has a variety of lengths between 10 microns and 5 mm, and the preferred implementation range is 0.5-3 mm; each micro-carbon The ratio of the helical diameter of the coil 2 to the pitch is between 1:1-5, and the diameter of the carbon filament to the helical diameter is between 1:5-10; particularly, the preferred solution adopted in this embodiment is: the micro-carbon The coil 2 accounts for 1%-3% of the total weight of the absorbing material.

[0034] See attached Figure 2-3 , the morphology of the microcarbon coil 2 under an electro...

Embodiment 2

[0044] Refer to attached Figure 5 , on the basis of the above-mentioned embodiment one, there are also some auxiliary agents in the matrix 1, these auxiliary agents include granular carbon 3 (the granular carbon 3 can be carbon black, graphite powder or obtained by pulverizing the micro-carbon coil of the present invention carbon powder), rod-shaped carbon 4 (the rod-shaped carbon 4 can be nano-carbon rods, vapor-phase grown straight carbon fibers), aluminum fragments 5 and ferrite 6, and the respective additions of these auxiliary agents account for 0.1%- 8%, wherein ferrite 6 is generally added in an amount of 5% of the weight of the wave-absorbing material, and the addition of other auxiliary agents (granular carbon 3, rod-shaped carbon 4, aluminum fragments 5) is preferably 1%.

[0045] With the addition of the above components, the ferrite increases the inductance L and increases the magnetic loss; the carbon powder and carbon rod affect the resistance R due to overlappi...

Embodiment 3

[0048] Refer to attached Figure 6 , on the basis of the first embodiment above, the substrate 1 is in the shape of a thin sheet, and its bottom surface is provided with a metal layer 7, the metal layer 7 will reflect electromagnetic waves, so that the electromagnetic waves that will pass through the substrate 1 will be reflected back to the micro carbon coil 2 and other auxiliary materials. agent for secondary, three or even multiple times of absorption; when the absorbing material of this embodiment is attached to the surface of an electronic instrument, it will firstly effectively reduce the residual electromagnetic wave back to the atmosphere, and secondly prevent the residual electromagnetic wave from passing through the absorbing material Access to electronic equipment. Similarly, a metal layer can also be provided on the basis of the second embodiment, which will not be described in detail here.

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Abstract

The present invention proposes a wide-frequency-domain wave-absorbing material, including a base body, which is characterized in that: the base body has a plurality of micro-carbon coils; the micro-carbon coils account for 0.5%-10% of the total weight of the wave-absorbing material, and the micro-carbon coils have One or more lengths to achieve the absorption effect of electromagnetic waves in different frequency domains, the optimal condition of the present invention is that the micro-carbon coils have multiple lengths between 10 microns and 5 millimeters, and the helical diameter of each micro-carbon coil The ratio to the pitch is between 1:1‑5, and the diameter of the carbon filament to the diameter of the helix is ​​between 1:5‑10. The present invention also relates to a multi-layer structure broadband wave-absorbing material, including a matrix, characterized in that the matrix has at least one main material layer and at least one auxiliary material layer, and the main material layer is as described above. The invention provides a fundamental solution for effectively absorbing space electromagnetic radiation, and has the advantages of wide absorption frequency range, high efficiency, light and thin material, low cost, suitable for quantitative production, and the like.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding and absorption, and in particular relates to a wide-frequency domain wave-absorbing material. Background technique [0002] With the improvement of living standards, all kinds of electrical appliances appear in ordinary households, such as refrigerators, washing machines, mobile phones, wireless routers, etc., followed by the convenience of life, but also the trouble of electromagnetic radiation; even With little or no electrical appliances, the space we live in is still filled with electromagnetic radiation of various frequencies, which come from outdoor high-voltage transmission lines, substations, transformers, communication base stations, communication satellites, etc. Theoretically, all devices and machines that use electricity will produce a certain amount of electromagnetic radiation. These forms of electromagnetic radiation exist around us like air, and are harmful not on...

Claims

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Application Information

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IPC IPC(8): H05K9/00C09K3/00
CPCH05K9/0083C09K3/00
Inventor 不公告发明人
Owner 福建星宏新材料科技有限公司
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