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Metamaterial wave absorber and design method

A wave absorber and metamaterial technology, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problem of metamaterial wave absorber absorption rate only reaching 77%, and achieve high absorption rate, high-efficiency absorption, absorption peak The effect of frequency stabilization

Active Publication Date: 2018-11-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

This design method is blind, and the absorption rate of the designed metamaterial absorber only reaches 77%.

Method used

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  • Metamaterial wave absorber and design method
  • Metamaterial wave absorber and design method
  • Metamaterial wave absorber and design method

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specific Embodiment

[0047] Specific embodiment: a metamaterial absorber with perfect absorbing performance and the design of the unit cell structure of the metamaterial absorber:

[0048] (1) The metamaterial absorbing structure is generally three layers, see figure 1 and image 3 . It is composed of the uppermost periodic metal structure, the middle dielectric substrate and the lowest metal backplane. The upper and lower layers are made of metallic copper with a conductivity of 5.8×10 7s / m, its thickness is 0.035mm, the intermediate layer dielectric substrate is FR-4 (the code name of the flame-resistant material grade of glass fiber epoxy resin copper clad laminate), the relative dielectric constant is 4.9, the loss tangent is 0.025, and the thickness is 0.3 mm.

[0049] Denote R(ω) as the reflectivity, T(ω) as the transmission rate, ω as the frequency of the incident wave, and the absorption rate A(ω) of the absorbing structure can be expressed as

[0050] A(ω)=1-R(ω)-T(ω)

[0051] The f...

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Abstract

The invention relates to a metamaterial wave absorber and a design method. The metamaterial wave absorber is characterized by comprising a dielectric plate, a metal plate and a metal material having aperiodic structure, wherein the dielectric plate is used as a substrate of the metamaterial wave absorber and is arranged between the metal plate and the metal material having the periodic structure;the metal material having the periodic structure is composed of multiple unit-cell structures which are periodically and repeatedly arrayed; and each unit-cell structure is composed of four T shapesarrayed symmetrically in a rotatable manner. According to a metamaterial absorbing structure disclosed by the invention, under a specific frequency band, the surface impedance of the structure is perfectly matched with the impedance of a free space; meanwhile, the structure has a polarization insensitivity characteristic, has an extremely high absorption rate under different polar angles and is stable in absorbing peak frequency; and within an extremely wide angle range, the wave absorbing structure is extremely high in absorbing stability for oblique incidence TE and TM polaried electromagnetic waves.

Description

technical field [0001] The invention belongs to an electromagnetic metamaterial wave absorber, relates to a metamaterial wave absorber and a design method, in particular invents a novel multi-layer metamaterial wave absorber with perfect wave absorbing performance and a design method. Background technique [0002] Metamaterial absorbers based on the electromagnetic coupling characteristics of electromagnetic metamaterials have perfect wave-absorbing characteristics. For different design goals, the overall wave-absorbing characteristics can be changed by designing different metamaterial configurations or adjusting key parameters, so that metamaterials can be applied to various The frequency band makes it have important application value in the fields of anti-electromagnetic interference and electromagnetic stealth technology. [0003] Document 1 "N.I.Landy, S.Sajuyigbe, J.J.Mock, D.R.Smith and W.J.Padilla. Perfect Metamaterial Absorber [J], Physical Review Letter (2008)" disc...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 邱克鹏骆越冯树琦张卫红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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