Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A periodic structure wave-absorbing patch and its preparation method

A periodic structure and wave-absorbing patch technology, which is applied in antennas, electrical components, 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, which is beneficial to light weight, Effect of improving impedance matching characteristics and good electromagnetic wave absorption performance

Active Publication Date: 2021-06-25
HENGDIAN GRP DMEGC MAGNETICS CO LTD
View PDF5 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A periodic structure wave-absorbing patch and its preparation method
  • A periodic structure wave-absorbing patch and its preparation method
  • A periodic structure wave-absorbing patch and its preparation method

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

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 a periodic structure of the present invention includes a plurality of periodic units 3, and each periodic unit 3 includes two parts, unit 1 and unit 2, wherein the composition and weight percentage of the unit 1 are: polymer binder: 10% to 25%, Fe-Si-Al soft magnetic alloy magnetic powder: 60% to 75%, carbonyl iron powder: 15% to 30%, auxiliary materials: ≤1%; the composition and weight percentage of the unit 2 are: Polymer binder: 30% to 60%, conductive carbon black: 35% to 65%, silicon dioxide: 5% to 15%, additives: ≤2%. Compared with the traditional wave-absorbing magnetic sheet, the wave-absorbing patch of the present invention has better electromagnetic wave absorption performance and widens the wave-absorbing frequency of the patch through the unique periodic unit design, the composition of each unit and the design of the preparation process.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com