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Electromagnetic wave absorbing structure

An electromagnetic wave absorbing and wave structure technology, applied in electrical components, magnetic/electric field shielding, chemical instruments and methods, etc., can solve problems such as cost increase, and achieve the effects of low cost, strong operability and low density

Inactive Publication Date: 2012-10-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the cost of manufacturing metamaterials will obviously increase significantly

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The electromagnetic parameters of the magnetic wave-absorbing material used in this embodiment are as follows: Figure 4 shown. The specific size parameters are (in mm): r=0.22, t=0.05, a=25, l=21, d=5.

[0018] In the case of vertically incident TE or TM waves, this embodiment has strong absorbing performance near 5 GHz, such as Figure 5 shown. The structure achieves the strongest absorbing effect at 5GHz, and the reflection coefficient is -14dB. The frequency band whose reflectivity is less than -10dB is 4.85-5.3GHz. In the frequency band less than 4.5GHz, there is a reflection coefficient of -2dB, and in the frequency band greater than 5.6GHz, there is a reflection coefficient of -5dB.

Embodiment 2

[0020] The real part and the imaginary part of the magnetic permeability of the magnetic absorbing material used in this embodiment are both about 1 between 6-8 GHz. The specific size parameters are (in mm): r=0.22, t=0.5, a=20, l=15, d=5.

[0021] In the case of vertically incident TE or TM waves, this embodiment has strong wave-absorbing performance near 7 GHz. The structure achieves the strongest absorbing effect at 7GHz, and the reflection coefficient is -15dB. The frequency band whose reflectivity is less than -10dB is 6.7-7.3GHz. In the frequency bands less than 5GHz and greater than 9GHz, there is only -2dB absorbing performance.

Embodiment 3

[0023] The real part and the imaginary part of the magnetic permeability of the magnetic absorbing material used in this embodiment are both about 1 between 6-8 GHz. The specific size parameters are (in mm): r=0.22, t=1, a=20, l=16, d=5.

[0024] In the case of vertically incident TE or TM waves in this embodiment, it has strong wave-absorbing performance near 5.5 GHz. The structure achieves the strongest absorbing effect at 5.5GHz, and the reflection coefficient is -8dB. In the frequency band less than 4.3GHz, there is only -2dB absorbing performance.

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Abstract

The invention provides an electromagnetic wave absorbing structure and belongs to the technical field of electronic materials. A light foam material layer covers a metal panel; a copper segment array is periodically arranged on the surface of the foam material layer; and the surface of copper wires are coated with an iron-based magnetic absorbing material. The electromagnetic wave absorbing structure has the advantages of simple structure, simple preparation process, strong operability and low cost; the whole structure is mainly made of light foam with low density, and has the characteristic of narrow band wave absorption; and the position, frequency band and amplitude of an absorption peak can be adjusted by reasonably adjusting the size parameter of the structure.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to an electromagnetic wave-absorbing structure and a design method thereof. Background technique [0002] Since World War II, radar absorbing materials have become the research focus of various countries. Especially due to the development of stealth technology, radar absorbing materials, as an effective means to improve the survivability and penetration capabilities of weapon systems, are firstly valued in the military. At present, many electronic devices have penetrated into various fields of real life. These electronic devices radiate electromagnetic waves into the environment, causing serious pollution, such as electromagnetic interference, electromagnetic compatibility, and a series of electromagnetic wave pollution that is harmful to organisms. Therefore, radar absorbing materials are also widely used in civil applications such as information dissemination, elect...

Claims

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Application Information

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IPC IPC(8): H05K9/00B32B15/04B32B5/18
Inventor 邓龙江张辉彬周佩珩陈良梁迪飞谢建良
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA