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Electromagnetic wave absorbing material

A wave-absorbing material and electromagnetic wave technology, applied in the direction of layered products, chemical instruments and methods, metal layered products, etc., can solve the problems of increasing the thickness of the absorber, harsh requirements for materials, and limitations in magnetic permeability, etc., to achieve the expansion of absorbing Wave frequency band, low cost, and strong operability

Inactive Publication Date: 2011-08-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the thickness of the absorber is increased, and at the same time, more stringent requirements are placed on the material.
Especially for the low frequency band, 2-10GHz is the frequency band for information exchange and transmission, which is particularly important. The wavelength of this frequency band is relatively long, and the corresponding absorber is also thick, and the magnetic permeability of this frequency band is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] An electromagnetic wave-absorbing structure is formed by embedding periodic aluminum foil patterns in an existing wave-absorbing rubber plate. Aluminum foil unit size a=7mm, aluminum foil unit spacing b=3mm.

[0017] The electromagnetic absorber designed by the above method, in the case of vertical incidence of TE or TM waves, its 9.5dB attenuation frequency band is below 2GHz to 7.2GHz (the lowest frequency band that can be tested by this experimental test equipment is 2GHz), and the bandwidth is greater than 5.2 GHz. However, for the 2.5mm thick wave-absorbing rubber sheet not embedded with periodic aluminum foil, the 9.5dB attenuation frequency range is 2.2GHz to 4.8GHz, and the bandwidth is 2.6GHz. In contrast, the absorbing structure more than doubles the bandwidth. The reason is the generation of double resonance: the first resonance between the aluminum foil and the metal film of the test equipment, and the second resonance by the structure of the aluminum foil...

Embodiment 2

[0019] An electromagnetic wave-absorbing structure is formed by embedding periodic aluminum foil in the existing wave-absorbing rubber plate. The size of the aluminum foil unit is a=5mm, and the distance between the aluminum foils is 5mm.

[0020] The electromagnetic wave absorber designed in the above manner has a 9.5dB attenuation frequency range of below 2GHz to 5.04GHz and a bandwidth greater than 3.04GHz under the condition of vertical incidence of TE or TM waves. Compared with the 2.5mm-thick wave-absorbing rubber sheet without embedding periodicity, its bandwidth has also been expanded, but the effect is not as good as that of Embodiment 1. The main reason is that the aluminum foil unit becomes smaller, the resonant frequency moves to high frequency, and the second resonant frequency is much higher than the absorption peak of the rubber sheet, which makes the high frequency effect slightly worse.

Embodiment 3

[0022] An electromagnetic wave-absorbing structure is formed by embedding periodic aluminum foil in the existing wave-absorbing rubber plate. The size of the aluminum foil unit is a=9mm, and the distance between the aluminum foils is 1mm.

[0023] The electromagnetic absorber designed in the above manner has a 9.5dB attenuation frequency band of 5.52GHz to 8.48GHz and a bandwidth of 3.96GHz in the case of vertical incidence of TE or TM waves. Compared with the 2.5mm thick wave-absorbing rubber sheet that is not embedded periodically, the wave-absorbing frequency band shifts to high frequency, failing to achieve the purpose of expanding the bandwidth. The main reason is that the aluminum foil unit becomes larger, and the resonant frequency moves to the low frequency. The resonant frequency is far lower than the absorption peak of the rubber sheet, so the low frequency effect is slightly worse.

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Abstract

The invention discloses an electromagnetic wave absorbing material which relates to an electronic material. The electromagnetic wave absorbing material comprises a wave absorbing glue substrate and a cover layer; and the electromagnetic wave absorbing material is characterized in that an aluminium foil pasting layer is arranged between the wave absorbing glue substrate and the cover layer, the aluminium foil pasting layer is prepared from square aluminum foils which are arranged in a matrix mode, the side length of each aluminum foil is 5-9 mm, and the distance between two adjacent aluminum foils is 1-5 mm. In the invention, the wave absorbing frequency range is greatly expanded nearly without increasing the thickness of a wave absorbing body. Through rationally adjusting the graphic size of each aluminum foil, the electromagnetic wave absorbing material disclosed by the invention is also suitable for rubber plates made of different materials.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/22B32B15/04B32B15/20
Inventor 周佩珩张辉彬邓龙江谢建良梁迪飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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