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Electromagnetic wave absorber and method for electromagnetic wave absorption

An electromagnetic wave and absorber technology, applied in the direction of magnetic objects, circuits, magnetic materials, etc., can solve the problem of large thickness, achieve high electromagnetic wave absorption characteristics, excellent productivity, and expand the use of the effect.

Inactive Publication Date: 2010-08-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned wedge-shaped or pyramid-shaped electromagnetic wave absorber, in order to extend the electromagnetic wave absorption characteristics to low-frequency (MHz band) electromagnetic waves, there is a problem that the thickness becomes very large (for example, several m)

Method used

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  • Electromagnetic wave absorber and method for electromagnetic wave absorption
  • Electromagnetic wave absorber and method for electromagnetic wave absorption
  • Electromagnetic wave absorber and method for electromagnetic wave absorption

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no. 1 approach

[0047] First, according to figure 1 The electromagnetic wave absorber 1 of the first embodiment will be described. figure 1 It is an explanatory diagram showing the electromagnetic wave absorber 1 of the first embodiment.

[0048] Such as figure 1 As shown, the electromagnetic wave absorber 1 of the first embodiment is composed of a composite body formed by combining a base material 2 made of a high dielectric material and having a cubic shape, and a filler 3 made of a high magnetic material and having a cylindrical shape. Among them, as the high dielectric material in the first embodiment, barium titanate (relative complex permittivity ε at a measurement frequency of 45 MHz, for example) can be used r The value of the real part of is "90", the relative complex permeability μ r The value of the real part of is "1"). In addition, as a high magnetic material, for example, ferrite can be used (relative complex permittivity ε at a measurement frequency of 45 MHz r The value of ...

no. 2 approach

[0085] Next, according to Figure 7 The electromagnetic wave absorber 41 of the second embodiment will be described. Figure 7It is an explanatory diagram showing the electromagnetic wave absorber 41 of the second embodiment.

[0086] Such as Figure 7 As shown, the electromagnetic wave absorber 41 of the second embodiment is composed of a composite body composed of a base material 42 made of a high magnetic material and having a cubic shape, and a filler 43 made of a high dielectric material and having a cylindrical shape. However, in the second embodiment, as a high magnetic material, for example, ferrite (relative complex permittivity ε at a measurement frequency of 45 MHz r The value of the real part of is "2", the relative complex permeability μ r The value of the real part of is "90"). In addition, as a high dielectric material, for example, water (relative complex permittivity ε at a measurement frequency of 45 MHz) can be used r The value of the real part of "80.4...

no. 3 approach

[0096] Next, according to Figure 8 The electromagnetic wave absorber 51 of the third embodiment will be described. Figure 8 It is a partial enlarged explanatory view showing the electromagnetic wave absorber 51 of the third embodiment.

[0097] Such as Figure 8 As shown, the electromagnetic wave absorber 51 of the third embodiment is composed of a composite body in which a first belt-shaped body 52 made of a high dielectric material and a second belt-shaped body 53 made of a high magnetic material are combined. Among them, as the high dielectric material in the third embodiment, barium titanate (relative complex permittivity ε at a measurement frequency of 45 MHz, for example) can be used r The value of the real part of is "90", the relative complex permeability μ r The value of the real part of the value is "1"), water (the relative complex permittivity ε at the measurement frequency of 45MHz r The value of the real part of "80.4", the relative complex permeability μ ...

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Abstract

This invention provides an electromagnetic wave absorber, which has high electromagnetic absorbing characteristics for electromagnetic waves in a broad band including low-frequency electromagnetic waves and has realized a thin film and a reduced weight, and a method for electromagnetic wave absorption. The electromagnetic wave absorber comprises a composite produced by compositing a base material, which is formed of a highly dielectric material and having a cubic shape, with a filler formed of a highly magnetic material and filled into each long hole formed in three directions within the base material and has a structure comprising the highly dielectric material and the highly magnetic material being three-dimensionally continued to each other.

Description

technical field [0001] The present invention relates to an electromagnetic wave absorber and an electromagnetic wave absorbing method capable of absorbing broadband electromagnetic waves emitted from electronic components such as motors. Background technique [0002] In recent years, there have been many cases where the electromagnetic waves emitted by electronic devices such as drive motors and computers interfere with the normal operation of other electronic devices. Therefore, a method of preventing adverse effects due to electromagnetic waves by surrounding these electronic devices with an absorber that absorbs electromagnetic waves to form partitions has been employed (for example, refer to Japanese Patent Application Laid-Open No. 2004-207328). In addition, in such an electromagnetic wave absorber, as a necessary condition for improving the electromagnetic wave absorption characteristics, in addition to attenuating the incident electromagnetic wave, it is important to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H01F1/00B32B1/00
CPCH01Q17/004B82Y25/00H01F1/0081
Inventor 久米克也多田雅孝江里口冬树畑中武藏福田佑纪星野利信桥本修祥云勇一
Owner NITTO DENKO CORP