Broadband wave-absorbing metamaterial with adjustable narrow-band reflection window

A metamaterial and window technology, applied in the field of metamaterials, can solve the problems that the reflection function is not adjustable, weak, and cannot realize electromagnetic wave reflection control, etc.

Active Publication Date: 2021-09-24
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent (201911189277.2) of "An Absorbing and Transmitting Integrated Material with a Broadband Wave-Transmitting Window", a multifunctional metamaterial with a broadband absorbing-wave-transmitting window is reported, but it cannot realize the reflection of electromagnetic waves. control, and the wave-transparent function is not adjustable
Although removing a certain unit structure in the broadband absorbing metamaterial with a gradient unit structure can cause electromagnetic wave reflection in the corresponding frequency band, since this kind of broadband absorbing metamaterial is excited by the metal-dielectric microstructure with a gradient width The multi-mode slow optical waveguide mode expands the bandwidth of electromagnetic wave absorption, that is to say, broadband absorption is superimposed by the absorption effects of each unit on the entire absorption bandwidth, so removing a certain unit structure causes electromagnetic wave reflection to appear in its corresponding frequency band Relatively weak, and the reflective function is not adjustable

Method used

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  • Broadband wave-absorbing metamaterial with adjustable narrow-band reflection window
  • Broadband wave-absorbing metamaterial with adjustable narrow-band reflection window
  • Broadband wave-absorbing metamaterial with adjustable narrow-band reflection window

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Embodiment 1

[0027] This embodiment provides a broadband absorbing metamaterial with an adjustable narrow-band reflection window, its structure is as follows Figure 1 to Figure 2 As shown, the truss-shaped stacked structure is arranged on the metal substrate in an n×n period, and the truss-shaped stacked structure is formed by stacking N layers of square sheet-shaped unit structures. The square sheet-shaped unit structure consists of a dielectric layer and a metal reflective layer in sequence from bottom to top. The included angle between the side and the bottom of the pyramid-shaped stacked structure is 60-70 degrees; the thickness of the dielectric layer is 0.2mm-0.3mm; the thickness of the metal reflection layer is 0.018mm-0.030mm.

[0028] The number of layers of the pyramid-shaped stacked structure is 10-20 layers.

[0029] The square sheet-shaped unit structure of the m-th layer of the quadrangular pyramid-shaped stacking structure from bottom to top, 4

Embodiment 2

[0037] The broadband absorbing metamaterial provided in this embodiment has an adjustable narrow-band reflection window. The truss-shaped stacked structure is formed by stacking 20 layers of square sheet-shaped unit structures, and the ratio of the side to the height of the truss-shaped stacked structure is 1.14. . The thickness of the dielectric layer is 0.2mm, and the thickness of the metal reflection layer is 0.018mm.

[0038]The volume ratio of flake micron-scale ferromagnetic metal particles and polypropylene in the composite material is 5%. Fe 78 Ni 4 B 14 Si 4 The nanocrystalline alloy powder was obtained by stirring and milling at 80 degrees Celsius and silicone oil medium at a rotation speed of 150 rpm for 10 hours, and washing and vacuum drying. Its electron microscope photographs are as image 3 shown.

Embodiment 3

[0040] The broadband wave-absorbing metamaterial provided in this embodiment has an adjustable narrow-band reflection window, and the quadrangular truss-shaped stacked structure starts from the mth layer from the bottom to the top. The L-layer square sheet-shaped unit structure, L=0~2, 4< m, m+L<19, the dielectric layer is a magnetic dielectric layer, which provides low loss and variable refractive index with the applied magnetic field to obtain an adjustable reflection window; the truss-shaped stack structure is the first from bottom to top ~m-1 layer and m+L~top layer, the dielectric layer is FR-4 epoxy material layer, which provides appropriate loss to obtain broadband absorption.

[0041] When L=0, it has an obvious narrow-band reflection window, and the frequency is adjustable. When L=1~2, the reflection window frequency remains unchanged, but the window becomes wider and the adjustability becomes worse. When L>2, the window is similar to L=2, and the absorption performa...

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Abstract

The invention relates to a broadband wave-absorbing metamaterial with an adjustable narrow-band reflection window. The broadband wave-absorbing metamaterial is formed by laminating a plurality of square sheet-shaped unit structures, each square sheet-shaped unit structure has two layers, namely a dielectric layer and a metal reflection layer from bottom to top in sequence, and the square sheet-shaped unit structures are reduced at equal ratio in the x and y directions along a stacking direction to form a quadrangular frustum pyramid-shaped structure. The stacked quadrangular frustum pyramid-shaped structure is provided with the metal substrate, so that a broadband wave-absorbing effect can be realized. The dielectric layer of the square sheet-shaped unit structure comprises in-plane oriented sheet-shaped iron / iron alloy particles with a large width-to-thickness ratio, and has adjustable electromagnetic parameters in a magnetic field, so that a narrow-band reflection effect is realized. The two are combined to jointly realize the wave absorbing effect of broadband wave absorbing-narrowband adjustable reflection, and the appearance, disappearance and frequency band of a reflection window are adjustable.

Description

technical field [0001] The invention relates to the technical field of metamaterials, in particular to a broadband wave-absorbing metamaterial with an adjustable narrow-band reflection window. Background technique [0002] With the development of electromagnetic wave stealth, sensing, detection, wireless communication and other fields, it is required to build working devices that can flexibly manipulate and control electromagnetic waves in addition to coping with increasing electromagnetic interference and electromagnetic pollution. Electromagnetic wave absorption (wave absorption) can absorb electromagnetic wave energy and convert it into other forms of energy. It is one of the best means to reduce the increasing electromagnetic interference and electromagnetic pollution. [0003] Traditional absorbing materials are easier to achieve broadband absorbing, but they are powerless to manipulate and control electromagnetic wave phenomena. Metamaterials are artificially designed...

Claims

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Application Information

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IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q15/0026H01Q15/002H01Q17/007
Inventor 王维刘婉莎谢春晓孙振忠
Owner DONGGUAN UNIV OF TECH
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