Multilayer ultra-wideband wave-absorbing body based on electric loss material and magnetic material combination

A technology of magnetic materials and wave absorbers, applied in the direction of electrical components, antennas, etc., can solve the problems that the absorption strength and absorption width are difficult to meet the requirements, the reflection curve fluctuates violently, and the low-frequency absorption effect is not good.

Active Publication Date: 2019-11-26
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional absorbing materials such as iron-based materials, carbon-based materials, etc. Although these absorbing materials can achieve broadband absorption under a certain thickness, their absorption strength and absorption width are often difficult to meet the requirements.
[0003] Meng Fanzhang and Wu Duanxin of Nanjing University proposed a broadband absorbin...

Method used

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  • Multilayer ultra-wideband wave-absorbing body based on electric loss material and magnetic material combination
  • Multilayer ultra-wideband wave-absorbing body based on electric loss material and magnetic material combination
  • Multilayer ultra-wideband wave-absorbing body based on electric loss material and magnetic material combination

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, by designing a multilayer resistive film with variable size and resistance value on the magnetic absorption layer, the electromagnetic wave in the broadband range is incident into the material and absorbed by the loss; the resistive film plays the role of absorbing electromagnetic waves and adjusting impedance matching. The absorption effect is further enhanced by the high loss of the bottom magnetic material. By rationally designing and optimizing the unit structure, a strong electromagnetic resonance in the broadband range is achieved, and an ultra-broadband absorbing effect is obtained. The absorption of low frequencies is mainly due to the magnetic loss of magnetic materials.

[0028] Such as figure 2 As shown, the ultra-broadband absorbing structure consists of a first resistive film layer (1), a second resistive film layer (2), a third resistive film layer (3), a fourth resistive film layer (4), a fifth resistive film layer The film ...

Embodiment 2

[0039] The support layer (9) spaced by the resistive film adopts a honeycomb material with a similar dielectric constant, and the relative dielectric constant ε1 is 1.15; the honeycomb material has higher compressive strength than the foam material. The honeycomb and the resistance film can also be bonded together by an adhesive through the adhesive film, and the adhesive can be epoxy resin, polyester resin, polyacrylic resin, etc.;

[0040] The square resistance Rs=60-200Ω / sq of each layer resistance film, the resistance film distance T=4mm; Unit period p=15mm; The cell size L1=5.0mm of the first layer resistance film (1), the second layer resistance film ( 2) unit size L2=6.8mm, the unit size L3=8.5mm of the third layer resistance film (3), the unit size L4=10.2mm of the fourth layer resistance film (4), the fifth layer resistance film (5) The cell size L5=12.0mm, the cell size L6=10.0mm of the sixth layer of resistance film (6).

[0041] Figure 6The reflection curve in i...

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Abstract

The invention provides a multilayer ultra-wideband wave-absorbing body based on electric loss material and magnetic material combination, and belongs to the technical field of microwave electromagnetic stealth. A wave-absorbing structure comprises six resistance film layers, a magnetic absorption layer, a metal reflection layer and a resistance film interval supporting layer. The six resistance film layers and the magnetic material form a laminated structure; the interval between the every two resistance film layers is T; and the thickness of the magnetic layer is H. The unit structures of theresistance film layers are square array structures with the sizes of L1, L1, L3, L4, L5 and L6 from top to bottom, and the unit period is P. Based on the reasonable structural design of an electric loss material and a magnetic material, the ultra-wideband wave-absorbing effect is achieved, and high-intensity absorption is achieved in certain frequency bands; due to the symmetry of the structure,the structure is insensitive to the polarization of electromagnetic waves; and the broadband large-angle absorption effect is enhanced due to the gradual change design of the multiple resistance layers.

Description

technical field [0001] The invention relates to the field of microwave electromagnetic stealth technology, in particular to a multilayer ultra-broadband absorber based on the composite of electric loss material and magnetic material. Background technique [0002] With the development of modern technology and the continuous enhancement of various detection technologies, the requirements for materials with broadband and electromagnetic wave absorption are getting higher and higher. Microwave absorbing materials can effectively absorb and attenuate incident electromagnetic waves and are widely used in military stealth, electromagnetic shielding and other electromagnetic protection. Traditional absorbing materials such as iron-based materials, carbon-based materials, etc., although these absorbing materials can achieve broadband absorption under a certain thickness, their absorption strength and absorption width are often difficult to meet the requirements. [0003] Meng Fanzha...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
CPCH01Q17/008
Inventor 尹生洪波明鹏王俊鹏龙昌
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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