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Stereo unit broadband period wave-absorbing structure

A technology of unit structure and wave structure, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems of unfavorable broadband wave absorption, single resonance frequency point, increased structure thickness, etc., to eliminate total reflection and improve wave absorption characteristics , the effect of light weight

Active Publication Date: 2015-11-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these absorbers have a common disadvantage: a good broadband absorption effect brings about a sharp increase in the thickness of the structure, usually the overall thickness of this type of broadband absorbing structure is 20-30mm
However, the single-layer absorbing structure designed according to the SalisburyScreen absorber and the circuit analog absorber has a single resonant frequency point, and when the overall thickness of the structure is equal to half of the working wavelength, it will produce total reflection, which is not conducive to broadband Realization of microwave absorption

Method used

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Examples

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Effect test

Embodiment 1

[0026] A three-dimensional unit broadband periodic absorbing structure, the unit structure is as follows figure 2 As shown, the specific size parameters are (in mm):

[0027] a 0 =17, a=14, d=14, w 1 =3.65,w 2 =3.65,w 3 =3.65,R sq1 =185Ω / □, R sq2 =70Ω / □

[0028] The electromagnetic absorber designed by the above method has a reflection coefficient of at least -5dB or less in the whole frequency band of 2-18GHz under the condition of vertical incidence of TE wave or TM wave, and the reflection coefficient of the frequency band of 3-18GHz is -7dB or less. reflection coefficient, such as image 3 shown.

Embodiment 2

[0030] A three-dimensional unit broadband periodic absorbing structure, the unit structure is as follows Figure 4 As shown, the specific size parameters are (in mm):

[0031] a 0 =18, a=15, d=15, w 1 =2.5,w 2 =7.5,w 3 =7.5,R sq1 =200Ω / □,R sq2 =85Ω / □

[0032] The electromagnetic absorber designed by the above method has a reflection coefficient of at least -5dB in the whole frequency band of 2-18GHz, and the frequency band of 3-17.5GHz has a reflection coefficient of -10dB in the case of vertical incidence of TE wave or TM wave. The following reflection coefficients, such as Figure 5 shown.

Embodiment 3

[0034] A three-dimensional unit broadband periodic absorbing structure, its specific size parameters are (in mm):

[0035] a 0 =17, a=14, d=15, w 1 = 4,w 2 =6,w 3 = 6, R sq1 =185Ω / □,R sq2 =80Ω / □

[0036] The electromagnetic absorber designed by the above method has a reflection coefficient of at least -6dB or less in the whole frequency band of 2-18GHz in the case of vertical incidence of TE wave or TM wave, and the reflection coefficient of the 2.29-18GHz frequency band is below -8dB. reflection coefficient.

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Abstract

The invention belongs to the technical field of electronic materials, especially relates to an electromagnetic wave-absorbing structure and provides a stereo unit broadband period wave-absorbing structure. The bottom layer of the stereo unit broadband period wave-absorbing structure is a metal plate. Cuboid-shaped hard foam composite unit structures printed with resistor film figures are periodically arranged above the metal plate, and the unit period is a0. Besides the surface bonded to the metal plate, the other five surfaces of each cuboid-shaped hard foam composite unit structure are also provided with the resistor films, wherein the upper surface perpendicular to an electromagnetic wave incident direction is in a square shaped and is printed with a square-annular-shaped resistor film, and the resistance is Rsq1; four side surfaces perpendicular to the upper surface are rectangular and are printed with square-annular-shaped resistor films whose resistance is the Rsq2. According to the invention, the wave-absorbing performance of the middle frequency (8-12GHz) is improved, and the incident electromagnetic waves can be absorbed by more than 80% in a 3-18GHz broadband scope.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to an electromagnetic wave-absorbing structure. Background technique [0002] In World War II, radar was widely used as an advanced long-distance detection tool. In order to enhance the penetration survivability of weapons and equipment, stealth technology came into being. In modern warfare, the electromagnetic environment is becoming more and more complex. As an effective means to improve the stealth ability of weapons and equipment, electromagnetic wave absorbing materials are increasingly valued by various military powers, and related research results are frequently published in newspapers. [0003] In addition, with the widespread use of technical products such as mobile phones, microwave ovens and induction cookers that use electromagnetic waves as a medium in various fields of real life, electromagnetic pollution such as electromagnetic radiation produced by them ...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 周佩珩张国瑞王丽周阳陈海燕谢建良邓龙江
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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