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Three-dimensional multi-band radar wave absorbing material

A radar absorbing material, three-dimensional technology, applied in the field of absorbing materials, can solve problems such as difficulty in mass production, complicated preparation methods, and difficulty in achieving absorption, and achieve the effects of low cost, low pollution, and many absorbing frequency points

Active Publication Date: 2018-08-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve the absorbing performance, multiple materials are usually combined. However, although it can produce superior effects, the preparation method is complicated, the cost itself is high, and it is difficult to achieve large-scale production.
At present, the dielectric structure type two-dimensional absorbing materials based on low dielectric constant materials, such as attached Figure 11 , can achieve a certain absorption effect, but the absorption frequency points are few, and the absorption range is above 13GHz, it is difficult to achieve lower frequency absorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The absorber is a periodic structure, a structure of a periodic unit: along the incident direction of the electromagnetic field, the first layer is a structural dielectric layer, which adopts a hollow-core cubic structure 1; the second layer is a total reflection plate 2. Structural diagram such as figure 1 , the absorber is a periodic structure unit, and the side length of a unit is L=30mm, wherein, the hollow core part is designed as a hexahedron whose length and width are d=16mm and height h=10mm; the hollow core part is separated from the hollow core in the vertical direction The bottom of the cube is 20mm, the material is FR4, the dielectric constant is 4.3, and the loss tangent is 0.025. Test results such as Figure 8 , the results show that there are eight perfect absorption peaks below -10dB, including 6.8GHz, 10.176GHz, 11.488GHz, 13.344GHz, 13.728GHz, 15.648GHz, 16.16GHz and 17.632GHz.

Embodiment 2

[0054] The absorber is a periodic structure, a structure of a periodic unit: along the incident direction of the electromagnetic field, the first layer is a structural dielectric layer, which adopts a hollow-core cubic structure 1; the second layer is a total reflection plate 2. Structural diagram such as figure 2 , the absorber is a periodic structure unit, the side length of a unit is L=30mm, wherein, the hollow core part is designed as a cylinder with a diameter of r=8mm and a height of h=18mm; the hollow core part is vertically separated from the bottom The bottom of the core cube is 12mm, the material is FR4, the dielectric constant is 4.3, and the loss tangent is 0.025. Test results such as Figure 9 , the results show that there are eight absorption peaks below --5dB, and five perfect absorption peaks below -10dB, including 5.84GHz, 6.832GHz, 12.24GHz, 13.312GHz, 15.888GHz, and 16.656GHz.

Embodiment 3

[0056] The absorber is a periodic structure, a structure of a periodic unit: along the incident direction of the electromagnetic field, the first layer is a structural dielectric layer, which adopts a hollow-core cubic structure 1; the second layer is a total reflection plate 2. Structural diagram such as image 3 , the absorber is a periodic structure unit, the side length of a unit is L=30mm, wherein, the hollow part is designed as a sphere with a diameter of r=20mm; the bottom of the hollow part is 2mm away from the bottom of the hollow cube in the vertical direction, and the material It is FR4, the dielectric constant is 4.3, and the loss tangent is 0.025. Test results such as Figure 10 , the results show that there are ten absorption peaks below --5dB, and eight perfect absorption peaks below -10dB, including 8.72GHz, 10.144GHz, 11.152GHz, 13.328GHz, 13.712GHz, 14.112GHz, 15.648GHz, and 16.224GHz.

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Abstract

The invention discloses a three-dimensional multi-band radar wave absorbing material. The three-dimensional multi-band radar wave absorbing material is formed by a periodical array structure, and a structure unit in the periodical structure consists of a three-dimensional dielectric material structure and a total reflection liner plate substrate; the three-dimensional dielectric material structurecomprises one or two layers of dielectric material structures, wherein when one layer of dielectric material structures is included, the dielectric material structure is designed into a hollow core hexahedron; and when two layers of dielectric material structures are included, the two layers of dielectric material structures adopt the same dielectric materials, wherein the lower layer dielectricmaterial structure is designed into a cuboid while the upper layer dielectric material structure is designed into a hexahedron, a cylinder, a hollow core hexahedron or a hollow core cylinder. The radar wave absorbing material has relatively more wave-absorbing frequency points, so that complete absorption within a relatively wide frequency range can be realized; and in addition, the three-dimensional multi-band radar wave absorbing material is simple in design, low in cost and suitable for the fields of radar wave absorbing, electromagnetic compatibility protection, an electromagnetic resonance device, radio frequency and the like.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a multi-band radar wave-absorbing material with a three-dimensional structure, belonging to the technical field of wave-absorbing materials. Background technique [0002] Absorbing material refers to a material that can absorb the energy of electromagnetic waves incident on the surface of the material within a certain frequency range. Traditional absorbing materials include ferrite, metal micropowder, silicon carbide, graphite, conductive fiber, etc. In order to improve the microwave-absorbing performance, multiple materials are usually combined. However, although it can produce superior effects, the preparation method is complicated, the cost itself is high, and it is difficult to achieve large-scale production. At present, the dielectric structure type two-dimensional absorbing materials based on low dielectric constant materials, such as attached Figure 11 , can achieve a certain...

Claims

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Application Information

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IPC IPC(8): H01Q17/00B32B3/00B32B27/08
CPCB32B3/00B32B27/08H01Q17/00
Inventor 王岩张芬黄小忠王强熊益军
Owner CENT SOUTH UNIV
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