Electromagnetic metamaterial

A technology of electromagnetic metamaterials and base materials, applied in the field of electromagnetic metamaterials, can solve the problems of narrow absorption frequency band, no low frequency absorption, high density, etc., and achieve the effect of light weight and reduced harm

Pending Publication Date: 2017-07-21
武汉碧海云天科技股份有限公司
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Absorbing materials usually refer to a class of materials that can effectively absorb incident electromagnetic waves and attenuate their energy, such as metamaterials made of Koch fractal structures and Hilbert. Different loss mechanisms convert incident electromagnetic waves into heat energy or other forms of energy to achieve the purpose of absorbing waves; while traditional low-frequency absorbing materials mainly use ferrite, which has the characteristics of high absorption rate, but has a narrow absorption frequency band , thicker thickness, higher density, fragile and higher price
[0004] In the prior art, there are also metamaterials with certain electromagnetic transparency, such as "an electromagnetic transparent metamaterial" shown in Chinese Patent No. 2011100618744. The basic principle is that several metals are arranged on the base material Branches, thro

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
  • Electromagnetic metamaterial
  • Electromagnetic metamaterial
  • Electromagnetic metamaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: a kind of electromagnetic metamaterial, can refer to Figure 1 to Figure 8 ; It includes a base material 100, the base material 100 is a PCB board made of polytetrafluoroethylene (FR4), and the PCB board is a flexible PCB board; One of the two surfaces is provided with a fractal structure layer 200, and the fractal structure layer 200 includes ring-shaped metal wires and metal wires of a fractal structure arranged on the surface of the base material; the fractal structure described in this design The metal wire is located inside the ring-shaped metal wire and is surrounded by the ring-shaped metal wire; the ring-shaped metal wire has the function of high-frequency transparency in application, and the metal wire of the fractal structure has the function of low-frequency absorption; at the same time, the above The shortest distance between the outermost metal wire of the fractal structure and the annular metal wire is 1.0 mm to 3.0 mm, specifically, the oute...

Embodiment 2

[0038] Embodiment 2, the similarities with Embodiment 1 will not be repeated, the difference is that this embodiment adopts Figure 9-Figure 13 The dimensions shown in shall be applied;

[0039] Table 1: Figure 9

[0040]

[0041] Table 2: Figure 10

[0042]

[0043] table 3: Figure 11

[0044]

[0045] Table 4: Figure 12

[0046]

[0047] table 5: Figure 13

[0048]

Embodiment 3

[0049] Embodiment 3, the similarities with Embodiment 1 or Embodiment 2 will not be repeated, the difference is that the design is provided with the fractal structure layers 200, 300 on the upper and lower surfaces of the base material 100 , through this design, magnetic resonance can be generated between the front and rear layers of the base material 100 .

[0050] To sum up, the electromagnetic metamaterial of the present invention realizes the characteristics of low-frequency wave absorption through the metal wire of the fractal structure with a magnetic permeability near zero, and realizes the high-frequency transparency through the ring-shaped metal wire of the ring structure. In the application, it can realize the electromagnetic radiation absorption of low-frequency magnetic field and various harmonics, and reduce its harm to surrounding equipment or personnel. At the same time, it has the characteristics of high-frequency transparent two-way electromagnetic materials; ...

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

No PUM Login to view more

Abstract

The present invention provides an electromagnetic metamaterial that can be used in the fields of radio energy transmission systems and electromagnetic protection, has a magnetic permeability near zero, and has the ability to absorb low-frequency magnetic fields and to be transparent to high-frequency electromagnetic waves. At least one of the upper and lower surfaces of the base material is provided with a fractal structure layer, and the fractal structure layer includes an annular metal wire and a fractal structure metal wire arranged on the surface of the base material; the fractal structure The metal wire is located inside the ring-shaped metal wire and surrounded by the ring-shaped metal wire; the present invention can realize electromagnetic radiation absorption of low-frequency magnetic fields and various harmonics in application, and can reduce its impact on surrounding equipment or The hazards of personnel, and at the same time have the characteristics of high-frequency transparent two-way electromagnetic materials, so that the electromagnetic metamaterials of the present invention can be used in the fields of radio energy transmission systems and electromagnetic protection.

Description

technical field [0001] The invention relates to the technical field of electromagnetic materials, in particular to an electromagnetic metamaterial with near-zero magnetic permeability, low-frequency magnetic field absorption and transparency to high-frequency electromagnetic waves, which can be used in the fields of radio energy transmission systems and electromagnetic protection. Background technique [0002] The hazards of electromagnetic radiation involve a wider and wider range, and have received great attention from people. With the continuous popularization of various wireless energy transmission devices such as wearable wireless devices and wireless charging devices, the strong magnetic fields and various harmonics caused by large currents in these systems will cause certain electromagnetic hazards to the environment and the human body. In order to communicate, the smooth flow of high-frequency signals is required. Therefore, it is necessary to design an advanced fun...

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): H01Q15/00
CPCH01Q15/0086
Inventor 杨河林杨乐群鲁军良
Owner 武汉碧海云天科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap