Preparation and application of broadband light metamaterial wave-absorbing structure

A technology of metamaterials and wave structures, applied in electrical components, magnetic/electric field shielding, screening casings, etc., can solve the problems of light weight of broadband absorbing and absorbing materials, narrow absorption frequency band, etc., and achieve novel design concepts and absorbing waves Broadband, easy-to-control effects

Active Publication Date: 2018-09-28
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metamaterial wave-absorbing structure absorbs electromagnetic waves through electromagnetic resonance, so the absorption frequency band is relatively narrow. Although single-frequency and multi-frequency absorption can also be achieved through the resonance principle, it is s

Method used

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  • Preparation and application of broadband light metamaterial wave-absorbing structure
  • Preparation and application of broadband light metamaterial wave-absorbing structure
  • Preparation and application of broadband light metamaterial wave-absorbing structure

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0049] Example 1:

[0050] First use DXP software to design a 5×5 "mosquito-repellent coil" pattern, connect to a fully automatic drilling, milling and engraving machine, and set a thickness of 2.0mm to 180×180mm 2 The FR4 substrate is fixed in the engraving area for hollow carving; then the expanded graphite is mixed with a certain mass of molten paraffin at a mass fraction of 10% to obtain a microwave absorbing material; then the microwave absorbing material is filled into the hollow pattern of the FR4 substrate In the gap, a broadband light-weight metamaterial absorbing structure material is obtained.

[0051] Use the material testing system to test the reflectivity of the material of the broadband lightweight metamaterial absorbing structure (representing the absorbing performance), and the test results are as follows figure 1 - figure 2 Shown. It can be seen that the frequency bandwidth of the metamaterial absorbing structure less than -10dB is about 3.8GHz, and the strongest...

Example Embodiment

[0052] Example 2:

[0053] The steps are the same as in Example 1, but a 1.0 mm thick FR4 material is used as the substrate. The metamaterial absorbing structure and test reflectivity results are as follows image 3 - Figure 4 Shown. It can be seen that the frequency bandwidth of the metamaterial absorbing structure less than -10dB is about 6.9GHz, and the strongest absorption peak is -16.6dB. The surface density of the absorbing structure is 0.139kg·m -2 .

Example Embodiment

[0054] Example 3:

[0055] The steps are the same as in Example 2, but the mass fraction of expanded graphite is 15%. The metamaterial absorbing structure and test reflectivity results are as follows Figure 5 - Image 6 Shown. It can be seen that the frequency bandwidth of the metamaterial absorbing structure less than -10dB is about 10.8GHz, and the strongest absorption peak is -29.2dB. The surface density of the absorbing structure is 0.163kg·m -2 .

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Abstract

The invention relates to a broadband light metamaterial wave-absorbing structure and preparation and application thereof. A structure unit of the metamaterial is a mosquito-repellent incense-shaped hollow pattern with the size being 1 to 3 cm, and the structural unit is distributed in a two-dimensional array of 5*5, 8*8 and 14*14 on a substrate of 180*180 mm. A microwave absorbing material is formed by mixing an absorbent and paraffin according to a certain mass fraction and is filled into a hollow gap of an FR4 or polytetrafluoroethylene substrate with the metamaterial. The metamaterial wave-absorbing structure has a remarkable wide frequency-light microwave absorption effect, wherein the effective bandwidth smaller than -10 dB is 3.5 to 16.8 GHz within the frequency range of 1 to 40 GHz;the surface density is 0.081 to 0.932 kilogram per square meter and the thickness is 0.5 to 2 mm. The structure is novel in design idea and has a broadband-light wave-absorbing characteristic, a preparation process is simple, raw materials are cheap and easy to obtain, the cost is low, and the structure is easy to apply and popularize, and furthermore, the obtained metamaterial has wide application prospect in the fields such as a microwave stealth technology, antenna, security check, thermal radiation detection, thermal radiation imaging, nondestructive detection and the like.

Description

technical field [0001] The invention relates to the field of electromagnetic functional materials, in particular to a method for designing, preparing and using a broadband lightweight metamaterial wave-absorbing structure. Background technique [0002] Absorbing materials are a type of functional materials that can effectively absorb incident electromagnetic waves and reduce the intensity of target echoes. Most of the traditional absorbing structures are designed based on the principle of the Salisbury absorbing screen, and the typical problems are that the volume is too large, the absorption frequency band is narrow, and the density is high. For traditional absorbing structures, the method of broadening the absorption frequency band is usually to increase the content of the absorber or increase the thickness of the material, but correspondingly, it will also bring disadvantages such as increased mass and reduced mechanical properties, which is difficult to meet actual needs...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0007H05K9/0081
Inventor 童国秀和子栋王帆琦陈锡炜孙嘉诚郭超吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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