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Electromagnetic camouflage metamaterial and application thereof

A metamaterial and electromagnetic technology, applied in the field of electromagnetic metamaterials, can solve the problems of limited number of reflected phases of the unit structure, inability to directly coat the metamaterial structure, low degree of freedom in metamaterial design, etc. Design flexibility, the effect of increased numbers

Active Publication Date: 2019-07-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The basic unit structure of the above-mentioned metamaterial structure is at a specific position, the basic units cannot be overlapped, and the design flexibility is not high; the number of reflection phases of the above-mentioned unit structure is limited, and the degree of freedom in metamaterial design is not high; the above-mentioned For metamaterials, changing the target area requires redesigning the cell arrangement; the above-mentioned metamaterial structure cannot be directly coated on the target surface, which has limitations in application

Method used

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  • Electromagnetic camouflage metamaterial and application thereof
  • Electromagnetic camouflage metamaterial and application thereof
  • Electromagnetic camouflage metamaterial and application thereof

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Embodiment 1

[0043] Figure 5a It is a three-dimensional diagram of electromagnetic camouflage metamaterials with metal patch lengths of 4mm and 6mm. In order to expand the reduced bandwidth of the metamaterial RCS, two metal patches with lengths of 4mm and 6mm are used. Metal bottom layer length×width×height=150mm*150mm*0.035mm, middle dielectric layer length×width×height=150mm*150mm*3mm. The metal patch area on the surface of the metamaterial accounts for 3.33%, 250 metal patches with a length of 4mm, 250 metal patches with a length of 6mm, and all metal patches are 0.3mm wide and 0.035mm thick. The metal patches are randomly distributed on the surface of the metamaterial and rotated arbitrarily, forming a large number of phase gradient units.

[0044] Figure 5b is the far-field two-station RCS reduction result of the electromagnetic camouflage metamaterial when the electric field polarization direction of the vertical incident wave is along the x-axis and y-axis respectively. The m...

Embodiment 2

[0046] Figure 6a It is a three-dimensional diagram of electromagnetic camouflage metamaterials with metal patch lengths of 4mm and 7mm. In order to expand the bandwidth of the metamaterial RCS and reduce the bandwidth, Case 2 uses metal patches with lengths of 4mm and 7mm respectively. The length × width × height of the metal bottom layer = 150mm × 150mm × 0.035mm, and the length × width × height of the intermediate dielectric layer = 150mm × 150mm × 3mm. The proportion of metal patches on the surface of the metamaterial is 3.67%, 250 metal patches with a length of 4mm, and 250 metal patches with a length of 7mm. The width of the metal patch is 0.3mm and the thickness is 0.035mm. The metal patches are randomly distributed on the surface of the dielectric layer 2 and rotated arbitrarily.

[0047] Figure 6b is the far-field two-station RCS reduction result of the electromagnetic camouflage metamaterial when the electric field polarization direction of the vertical incident ...

Embodiment 3

[0049] Figure 7a It is a three-dimensional diagram of electromagnetic camouflage metamaterials with metal patch lengths of 3mm and 8mm. In this embodiment, the metal patch 3 has two lengths, namely a metal patch with a length of 3 mm and a metal patch with a length of 8 mm. The length×width×height of the metal bottom layer=150mm*150mm*0.035mm, the length×width×height of the dielectric layer=150mm*150mm*3mm. The proportion of metal patches on the surface of the metamaterial is 3.67%. There are 250 metal patches with a length of 3mm and 250 metal patches with a length of 8mm. The width of the metal patch is 0.3mm and the thickness is 0.035mm. The metal patches 3 are randomly distributed on the surface of the dielectric layer 2 and rotated arbitrarily within 0-180°.

[0050] Figure 7b is the far-field two-station RCS reduction result of the electromagnetic camouflage metamaterial when the electric field polarization direction of the vertical incident wave is along the x-axis...

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Abstract

The invention discloses an electromagnetic camouflage metamaterial and application thereof. The metamaterial comprises a metal bottom layer and a dielectric layer which are sequentially arranged frombottom to top, wherein a plurality of metal patches are arranged on the dielectric layer, and the area of each metal patch accounts for 3%-6% of the area of the upper surface of the dielectric layer.Compared with the metamaterial of the basic unit at a specific position, the metamaterial is randomly distributed in the basic units, and the metal patches of the adjacent units can be overlapped to have larger design flexibility. The electromagnetic camouflage metamaterial is simple in structure, can perform direct spraying at a target surface except manufactured through the three-dimensional printing technology, and is wider in application. For target objects with different sizes, unit distribution is not required to rearrange, and the lengths and the area ratio of the metal patches are onlyneeded.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic metamaterials, in particular to an electromagnetic camouflage metamaterial and its application. Background technique [0002] Camouflage technology is a variety of concealment measures taken to deceive or confuse the other party, which is of great significance in the modern national defense system. The basic principle of camouflage is to reduce the difference in scattering or radiation characteristics between the target and the background, so as to conceal the real target or reduce the detectability characteristics of the target. The radar cross section (RCS) is a measure of the target's return scattering power in a given direction under the illumination of a plane wave, and it is an index to measure the camouflage technology. In recent years, the emergence of electromagnetic metamaterials, many of its novel physical properties that natural coal does not have, make it have many important ...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
CPCH01Q15/0086
Inventor 夏颂张亚宽
Owner XI AN JIAOTONG UNIV
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