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A metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films

A technology of magnetic wave absorption and resistive film, applied in the direction of magnetic/electric field shielding, electrical components, antennas, etc., to achieve good wave absorption effect, thin thickness, and high strength

Inactive Publication Date: 2017-06-16
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the overall thickness of the absorbing material is limited, it is difficult to achieve a breakthrough in the absorbing effect in the low frequency band by simply using a multilayer resistive film metamaterial absorbing structure

Method used

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  • A metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films
  • A metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films
  • A metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films

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specific Embodiment

[0023] figure 1 The length and width of the metamaterial wave-absorbing structural unit shown in the figure are both 3.8mm, and the total thickness is about 6.5mm. Among them, the four layers of PMI foam 1 all use XK110 with a thickness of 1.2mm and a relative dielectric constant of 1.15; the thickness of the five layers of PET dielectric substrate 2 is 0.125mm, and the relative dielectric constant is 3.1; the resistance film 3 (1)-3 (4) The specific resistance film shape is as follows figure 2 As shown, the square resistance values ​​of the resistive films 3(1)-3(4) are 150Ω, 220Ω, 350Ω and 60Ω in turn; the magnetic absorbing material is WAT_1mm with a thickness of 1mm, and its absorbing characteristics are as follows image 3 As shown, it can be seen that the main operating frequency band of the magnetic material is 1.5GHz-6GHz.

[0024] The reflectance curve of this embodiment is as Figure 4 shown by the solid line. Replace the magnetic material with PMI foam of the s...

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Abstract

The invention provides a metamaterial wave-absorbing structure based on a magnetic wave-absorbing material and multiple layers of resistive films. The metamaterial wave-absorbing structure comprises an array formed by a plurality of wave-absorbing units. Each wave-absorbing unit is formed by multiple layers of PMI foams (1), multiple layers of PET dielectric substrates (2), the multiple layers of resistive films (3(1)-3(4)), one layer of magnetic wave-absorbing material (4) and one layer of metal earth (5), which are stacked up alternately. Two kinds of wave-absorbing structures of the magnetic wave-absorbing material and the multiple layers of resistive films are combined, and thus contradiction of the composite wave-absorbing structure between thickness and low frequency wave-absorbing characteristic is tempered. The designed novel meta-material wave-absorbing structure is high in strength and thin in thickness, and has a good wave-absorbing effect within 1GHz-18GHz ultra-wide band.

Description

technical field [0001] The invention belongs to microwave stealth technology, in particular to a metamaterial wave-absorbing structure based on magnetic wave-absorbing materials and multilayer resistance films. Background technique [0002] Metamaterial absorbing structure refers to a type of composite absorbing material composed of a combination of metamaterial microstructure and dielectric substrate, which has the advantages of thin thickness, light weight, strong absorption, adjustable frequency band, and designable electrical parameters of the material. It has a wide range of applications in the field of stealth. At present, the wave-absorbing function of metamaterials is mainly realized by means of electromagnetic resonance, loading lumped elements or resistive films. [0003] The absorption of electromagnetic waves by metamaterial wave-absorbing structures based on electromagnetic resonance depends on the electromagnetic resonance of metal structures, and such structu...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H05K9/00
CPCH01Q17/00H05K9/00
Inventor 周丹晨沈静鄢学全
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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