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Zero-scattering linear particle and electromagnetic invisible material formed by the same

A particle and ray technology, applied in the field of electromagnetic stealth materials, can solve the problems of large spatial dispersion of electromagnetic parameters and complex realization, and achieve the effects of small loss, convenient realization and high transmittance

Inactive Publication Date: 2014-11-26
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this structure cannot be called a medium, because its electromagnetic parameters have great spatial dispersion, and the structure is fixed, and its realization is relatively complicated

Method used

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  • Zero-scattering linear particle and electromagnetic invisible material formed by the same
  • Zero-scattering linear particle and electromagnetic invisible material formed by the same
  • Zero-scattering linear particle and electromagnetic invisible material formed by the same

Examples

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Effect test

Embodiment 1

[0043] The size and composition medium of zero-scattering linear particle example 1 are as figure 1 shown. The axial cross-section of the zero-scattering linear particles in a square column structure is a square with side length a of 7mm, the metal structure is copper, and the electrical conductivity is 5.96×10 7 S / m, the arrangement period c of the metal unit is 7mm, the side length c of the cube metal particle is 4mm, the axial section side length d of the small square column type connecting column protruding from the six sides of the cube metal particle is 0.6mm, and the length is 1.5mm. The dielectric selected in this example is polysulfone (Polysulfone), with a relative permittivity of 2.97, a loss tangent of 0.0013, and a relative permeability of 1. The corresponding zero-scattering operating frequency is 10GHz. Simulation results such as figure 2As shown, at the working frequency, when the electromagnetic wave is perpendicularly incident, the scattering width of th...

Embodiment 2

[0047] The size and composition medium of zero-scattering linear particle example 2 are as Figure 4 shown. The axial cross-section of the zero-scattering linear particles in a square column structure is a square with side length a of 7mm, the metal structure is copper, and the electrical conductivity is 5.96×10 7 S / m, the arrangement period c of the spherical metal unit is 7mm, the radius is 2.5mm, and the diameter b is 5mm. The axial section of the cylindrical connecting column protruding from the three orthogonal directions of the spherical metal particles is a circle with a radius of 0.148mm , its diameter d is 0.296mm, and its length is 1mm. The dielectric selected in this example is still polysulfone (Polysulfone), and the corresponding zero-scattering working frequency is still 10 GHz. Simulation results such as Figure 5 As shown, at the working frequency, when the electromagnetic wave is perpendicularly incident, the scattering width of the zero-scattering linear p...

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Abstract

The invention discloses a zero-scattering linear particle and an electromagnetic invisible material formed by the same. The center of the particle is a metallic structure including metal units that are arranged in a linear mode periodically; the adjacent metal units are connected by connecting columns; the outsides of the metal units and the connecting columns are coated with a cylindrical dielectric medium, thereby forming the zero-scattering linear particle based on the solid cylindrical structure. The linear arrangement direction of the metal units and the height direction of the dielectric medium cylinder are identical with the electric field polarization direction of the incident electromagnetic wave during working. According to the invention the particle with the simple structure can be processed conveniently and can be processed into a material or structure with any shape according to different application demands. According to the instance simulation verification, a scattering width tending to zero can be obtained at the work frequency; and expanding to all frequency bands including a radio frequency band, a terahertz band, and even an optical wave band and the like can be realized directly by structural dimension scaling. Therefore, the provided particle can be widely applied to related application fields of the invisible material.

Description

technical field [0001] The invention relates to a particle and a stealth material, in particular to a zero-scattering linear particle and an electromagnetic stealth material composed thereof. Background technique [0002] The propagation, focusing and scattering of electromagnetic waves in the transmission medium are all determined by the electromagnetic properties of the transmission medium, and the electromagnetic properties of the medium can usually be described by two electromagnetic parameters, the dielectric constant and the magnetic permeability. In nature, almost all solids and liquids have different permittivity and / or magnetic permeability than free space, so when these objects are placed in free space, the electromagnetic waves incident on them will inevitably be reflected and refraction. It is because of this reflection and refraction that observers standing in free space from all angles can see these objects. Conversely, if there is a solid or liquid medium wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00
Inventor 叶德信朱忠博皇甫江涛冉立新
Owner ZHEJIANG UNIV
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