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

Multi-layer wave absorber structure and application thereof

A wave absorber and composite wave-absorbing material technology, applied in antennas, screening casings, electrical components, etc., can solve the problems of high total mass of wave absorbers, limited practical applications, and lack of universality of interlayers, and achieve improvement The effect of effective absorption bandwidth, strong universality and operability, and strong application value

Active Publication Date: 2021-11-23
PEKING UNIV
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These works have indeed improved the effective absorption bandwidth of the material to a certain extent, but the introduction of new interlayers requires the selection of suitable interlayer materials according to the needs of different absorber materials. The overall mass is high, which limits its practical application

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
  • Multi-layer wave absorber structure and application thereof
  • Multi-layer wave absorber structure and application thereof
  • Multi-layer wave absorber structure and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Single-layer graphene absorber: metal backing and graphene-paraffin composite absorbing material on metal backing surface.

[0055] After dissolving paraffin in n-hexane, add graphene powder, centrifuge and stir until n-hexane volatilizes to obtain a uniformly mixed graphene-paraffin composite absorbing material (the mass ratio of graphene and paraffin is 3:8), and the graphene-paraffin The composite absorbing material is placed in a mold and pressed to obtain a cylindrical ring with an inner diameter of 3.04 mm and an outer diameter of 7.00 mm. Measure the electromagnetic parameters of the cylindrical ring on the Agilent vector network analyzer, and calculate the electromagnetic wave reflection loss curves of the cylindrical rings with different thicknesses according to the electromagnetic parameters. The results are as follows Figure 4 As shown in (a), according to Figure 4 In (a), it can be seen that the best effective absorption bandwidth that the single-laye...

Embodiment 2

[0059] Carry out the theoretical calculation reflection loss curve of the multilayer wave absorber structure according to the method of embodiment 1 steps (1)~(2), and the difference with embodiment 1 is that the non-electromagnetic loss medium layer in step (2) has a thickness of 1.3 mm air layer, the structure of the multilayer absorber is a metal backing and a 1.4mm graphene-paraffin composite absorbing material layer, a 1.3mm air layer and a 0.3mm graphene-paraffin composite absorbing material layer stacked on the surface of the metal backing Material layer (recorded as 1.4mm+1.3mm air layer+0.3mm), the theoretically calculated reflection loss curve is as follows Figure 5 shown. Limited to the laboratory, it is currently impossible to prepare hollow samples for testing. The calculation result is not much different from that of using paraffin as the non-electromagnetic loss dielectric layer. This is because air and paraffin have similar high-frequency electromagnetic prop...

Embodiment 3

[0061] (1) Dissolve paraffin in n-hexane and add La 2 Fe 4 co 10 B powder, centrifuged until n-hexane volatilizes to obtain evenly mixed La 2 Fe 4 co 10 B-paraffin composite absorbing material (La 2 Fe 4 co 10 B and paraffin mass ratio is 5:1), the La 2 Fe 4 co 10 B-The paraffin composite wave-absorbing material is placed in a mold and pressed to obtain La with an inner diameter of 3.04mm and an outer diameter of 7.00mm. 2 Fe 4 co 10 B- paraffin cylindrical ring (denoted as single layer La 2 Fe 4 co 10 B).

[0062] (2) the La in step (1) 2 Fe 4 co 10 B is replaced by carbonyl iron, and the mass ratio of carbonyl iron and paraffin is 3:1, and a carbonyl iron-paraffin cylindrical ring (denoted as a single-layer carbonyl iron) is obtained.

[0063] (3)La 2 Fe 4 co 10 B / carbonyl iron double-layer absorber (denoted as double-layer): metal backing, 0.9mmLa stacked successively on the surface of the metal backing 2 Fe 4 co 10 B-paraffin wax composite absorbin...

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
The inside diameter ofaaaaaaaaaa
Outer diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of microwave absorption, in particular to a multi-layer wave absorber structure and application thereof. The multi-layer wave absorber structure provided by the invention has a sandwich structure, and the middle layer of the sandwich structure is a dielectric layer without electromagnetic loss; and the electromagnetic loss-free dielectric layer comprises a vacuum layer, an air layer, a paraffin layer or a polytetrafluoroethylene layer. The added electromagnetic loss-free dielectric layer enhances the impedance matching by modulating the phase of electromagnetic waves, so that the loss of the electromagnetic waves in the composite wave absorbing layer of the multi-layer wave absorber structure is enhanced, and the effective absorption bandwidth is further improved. The multi-layer wave absorber structure provided by the invention has higher universality and operability, and has the effect of improving the effective absorption bandwidth for wave absorbing devices made of various composite wave absorbing materials; in addition, the effective absorption bandwidth can be obviously improved while the mass is hardly increased, and the multi-layer wave absorber structure has very high application value.

Description

technical field [0001] The invention relates to the technical field of microwave absorption, in particular to a multilayer microwave absorber structure and its application. Background technique [0002] With the continuous expansion and improvement of the application fields and frequency bands of electromagnetic waves in modern society, it has become increasingly important for researchers to develop new and efficient electromagnetic wave absorbing materials (referred to as wave absorbing materials) for the purpose of radiation protection and energy absorption of electromagnetic waves. pressing challenge. From electromagnetic pollution control and electromagnetic radiation protection for civilian use; to military applications, stealth technology for radar signals; and in the field of scientific research, electromagnetic shielding and protection for precision testing and confidential research and development, there are urgently needed related engineering materials, Structural...

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
IPC IPC(8): H05K9/00H01Q17/00
CPCH05K9/0081H05K9/0007H01Q17/00H01Q17/008H05K9/0088H05K9/0056
Inventor 杨金波刘洲王常生韩景智杨文云刘顺荃
Owner PEKING UNIV
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