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Wave-absorbing patch with periodic structure and preparation method thereof

A periodic structure and wave-absorbing patch technology, which is applied in the direction of electrical components, antennas, magnetic field/electric field shielding, etc., can solve the problems of deteriorating low-frequency band absorption performance and reducing the filling amount of soft magnetic powder, so as to achieve the advantages of light weight, Effect of improving impedance matching characteristics and good electromagnetic wave absorption performance

Active Publication Date: 2020-08-25
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars add a certain amount of high-frequency absorbents to the wave-absorbing magnetic sheet to broaden the use frequency band of the patch, but the addition of these absorbents greatly reduces the filling amount of soft magnetic powder, which deteriorates the low-frequency band to a certain extent. Absorbency

Method used

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  • Wave-absorbing patch with periodic structure and preparation method thereof
  • Wave-absorbing patch with periodic structure and preparation method thereof
  • Wave-absorbing patch with periodic structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A wave-absorbing patch with a periodic structure, the wave-absorbing patch with a periodic structure includes a plurality of period units, and each period unit includes two parts: unit 1 and unit 2.

[0056] Among them, the composition and weight percentage of the unit 1 are: polymer binder: 12%, Fe-Si-Al soft magnetic alloy magnetic powder: 69%, carbonyl iron powder: 18.5%, auxiliary materials: 0.5%.

[0057] The polymer binder is polyurethane.

[0058] The appearance of the Fe-Si-Al soft magnetic alloy magnetic powder is scale-like, the average thickness of the magnetic powder is 0.9 μm, the aspect ratio (diameter direction dimension and thickness direction dimension) is 73:1, and the alloy composition (weight percentage) is Fe: 84.6%; Si: 9.3%; Al: 5.4%, impurity elements (including C, O, etc.) 0.7%.

[0059] The shape of the carbonyl iron powder is spherical, the average particle size is 3.2 μm, the composition (weight percentage) Fe=98.7%, and impurity elements (i...

Embodiment 2

[0082] A wave-absorbing patch with a periodic structure, the wave-absorbing patch with a periodic structure includes a plurality of period units, and each period unit includes two parts: unit 1 and unit 2.

[0083] Among them, the composition and weight percentage of unit 1 are: polymer binder: 14%, Fe-Si-Al soft magnetic alloy magnetic powder: 65.4%, carbonyl iron powder: 20.2%, auxiliary materials: 0.4%.

[0084] The polymer binder is polyurethane.

[0085] The appearance of the Fe-Si-Al soft magnetic alloy magnetic powder is scale-like, the average thickness of the magnetic powder is 0.9 μm, the aspect ratio (diameter direction dimension and thickness direction dimension) is 73:1, and the alloy composition (weight percentage) is Fe: 84.6%; Si: 9.3%; Al: 5.4%, impurity elements (including C, O, etc.) 0.7%.

[0086] The carbonyl iron powder has a spherical shape, an average particle size of 1.8 μm, a composition (weight percentage) of Fe=98.4%, and impurity elements (includi...

Embodiment 3

[0102] A wave-absorbing patch with a periodic structure, the wave-absorbing patch with a periodic structure includes a plurality of period units, and each period unit includes two parts: unit 1 and unit 2.

[0103] Among them, the composition and weight percentage of unit 1 are: polymer binder: 12.5%, Fe-Si-Al soft magnetic alloy magnetic powder: 70.6%, carbonyl iron powder: 16.4%, auxiliary materials: 0.5%.

[0104] The polymer binder is polyurethane.

[0105] The appearance of the Fe-Si-Al soft magnetic alloy magnetic powder is scale-like, the average thickness of the magnetic powder is 0.9 μm, the aspect ratio (diameter direction dimension and thickness direction dimension) is 73:1, and the alloy composition (weight percentage) is Fe: 84.6%; Si: 9.3%; Al: 5.4%, impurity elements (including C, O, etc.) 0.7%.

[0106] The carbonyl iron powder has a spherical shape, an average particle size of 1.8 μm, a composition (weight percentage) of Fe=98.4%, and impurity elements (inclu...

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Abstract

The invention belongs to the field of electromagnetic wave absorbing materials, and discloses a wave-absorbing patch with a periodic structure and a preparation method thereof. The wave-absorbing patch with the periodic structure comprises a plurality of periodic units 3. Each periodic unit 3 comprises a unit 1 and a unit 2, wherein the unit 1 comprises the following components in percentage by weight: 10%-25% of a polymer binder, 60%-75% of Fe-Si-Al soft magnetic alloy magnetic powder, 15%-30% of carbonyl iron powder and less than or equal to 1% of auxiliary materials; and the unit 2 comprises the following components in percentage by weight: 30-60% of polymer binder, 35-65% of conductive carbon black, 5-15% of silicon dioxide and less than or equal to 2% of assistant. Compared with a traditional wave-absorbing magnetic sheet, the wave-absorbing patch provided by the invention has better electromagnetic wave absorption performance through unique periodic unit design and component andpreparation process design of each unit, and the wave-absorbing frequency of the patch is broadened.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a wave-absorbing patch with a periodic structure and a preparation method thereof. Background technique [0002] The thickness of the wave-absorbing patch is relatively thin, generally less than 1mm. It is usually made of soft magnetic alloy powder and polymer binder through casting or calendering. It is pasted on the surface of electronic components to inhibit The role of electromagnetic clutter interference and leakage, so as to solve the electromagnetic compatibility and electromagnetic radiation problems of electronic products. [0003] With the rapid development of electronic information technology, electronic products are developing in the direction of high frequency, high integration and miniaturization, especially the trend of high frequency is obvious. This puts higher requirements on the traditional wave-absorbing patch materials, which are speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H01Q17/00
CPCH01Q17/00H05K9/0088
Inventor 刘立东朱航飞单震
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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