CN107864604A - A kind of ELECTROMAGNETIC RADIATION SHIELDING structure - Google Patents
A kind of ELECTROMAGNETIC RADIATION SHIELDING structure Download PDFInfo
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- CN107864604A CN107864604A CN201711106878.3A CN201711106878A CN107864604A CN 107864604 A CN107864604 A CN 107864604A CN 201711106878 A CN201711106878 A CN 201711106878A CN 107864604 A CN107864604 A CN 107864604A
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- Prior art keywords
- electromagnetic radiation
- thickness
- metal level
- shielding structure
- radiation shielding
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/061—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/105—Metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
Abstract
The present invention proposes a kind of ELECTROMAGNETIC RADIATION SHIELDING structure, can realize the broadband for externally carrying out electromagnetic radiation, high efficiency shielding.The ELECTROMAGNETIC RADIATION SHIELDING structure includes the bottom-up supporting layer set gradually, metal level and nanometer composite layer；The thickness of metal level is more than the penetration depth of electromagnetic radiation to be shielded, and the thickness of metal level is more than or equal to the thickness of substrate；The main body of nanometer composite layer is substrate, wherein it is filled with metal nanoparticle, the body fill factor, curve factor of metal nanoparticle meets phasmon of the electromagnetic radiation in micro-structural from effect of restraint in 5~30% scopes, thickness and the material configuration of metal level and nanometer composite layer.This laminated type nanostructured of the present invention, by phasmon of the electromagnetic radiation in micro-structural from effect of restraint, it can be achieved externally to come the broadband of electromagnetic radiation, high efficiency shielding.
Description
Technical field
The invention belongs to electromagnetic technology field, is related to a kind of ELECTROMAGNETIC RADIATION SHIELDING structure.
Background technology
With the development of modern science and technology, influence of the electromagenetic wave radiation to environment increasingly increases.In airport airplane flight
It is overdue because Electromagnetic Interference can not take off；The normal work of various electronic instrument for diagnosing and curing diseases devices can be often disturbed in hospital, mobile phone.
Therefore, electromagnetic pollution is administered, finds a kind of material that can weaken or even shield electromagenetic wave radiation, it has also become electromagnetic technology field
One big problem.On engineer applied, in addition to requiring such material and there is high absorptivity to electromagnetic wave in broad frequency band, also
Ask it that there is the performance such as light weight, heatproof, moisture-proof, anticorrosive.
Currently, application type and structural type can be divided into by material forming process, absorbing material；And loss mechanisms are pressed, inhale ripple material
Material can be divided into resistor-type, dielectric type and magnetizing mediums type again.
For resistor-type absorbing material, it, which is lost, is mainly derived from conductance loss.Conducting carriers orient in material internal
Drift, formed conduction electric current, in the form of heat energy by incidence electromagnetic wave lose, main representative material be charcoal system material (such as
Carbon black, graphite, carbon fiber, CNT etc.), nonmagnetic metal micro mist, conducting polymer etc..
For dielectric type absorbing material, it, which is lost, is mainly derived from dielectric relaxation polarization and resonance loss, main representative
Material is ceramic material, such as BaT iO3, metal oxide, nitrided iron, S i C, S i/C/N.
For magnetizing mediums type absorbing material, its loss is mainly derived from magnetic loss, mainly includes whirlpool caused by Kelvin effect
Residual loss caused by stream loss, magnetic hystersis loss and magnetic aftereffect etc., main representative material are ferrite, carbonyl iron, nitrided iron, magnetic
Property metal dust etc..
In addition, the absorbing material technical research for being currently based on Meta Materials also receives much concern.Meta Materials refer to that one kind has day
The artificial composite structure or composite of extraordinary electromagnetic property not available for right material.Researcher is based on Meta Materials within 2008
Concept propose the concept of electromagnetic wave " perfect absorber ".It passes through the key physical size design EMR electromagnetic resonance of designing material
Structure, the electromagnetic component of electromagnetic wave is set to produce coupling, so as to realize efficient absorption to the electromagnetic wave in particular pole narrow-band.But base
In Meta Materials design absorbing material necessarily influenceed by Meta Materials resonance characteristic itself, bring effect frequency range it is narrow, to incidence
The shortcomings of angular-sensitive, turn into the critical bottleneck technology that Meta Materials inhale wave technology development and application that restricts.The field current development
Trend is to explore broadband, high efficiency absorbing material technology.
The content of the invention
The present invention proposes a kind of ELECTROMAGNETIC RADIATION SHIELDING structure, can realize the broadband for externally carrying out electromagnetic radiation, high efficiency
Shielding.
The implementation of the present invention is as follows：
The ELECTROMAGNETIC RADIATION SHIELDING structure includes the bottom-up supporting layer set gradually, metal level and nanometer composite layer；
The thickness of the metal level is more than the penetration depth of electromagnetic radiation to be shielded, and the thickness of metal level is more than or equal to the thickness of substrate
(difference range is relevant with electromagnetic radiation as waves length to be shielded)；The main body of the nanometer composite layer is substrate, wherein filled with metal
Nano particle, the body fill factor, curve factor of metal nanoparticle is in 5~30% scopes, the thickness and material of metal level and nanometer composite layer
Material configuration meets phasmon of the electromagnetic radiation in micro-structural from effect of restraint.
Based on above scheme, it is as follows that the present invention also makes specific optimization：
The thickness of above-mentioned nanometer composite layer is in tens to hundreds of nanometer scales, and the thickness of the metal level is tens to hundreds of
Nanometer scale.
Metal level can material selection have：Gold, silver, aluminium etc..
Substrate can material selection have：Polytetrafluoroethylene (PTFE), calcirm-fluoride, magnesium fluoride etc..
Metal nanoparticle can material selection：Gold, silver etc..
Supporting layer generally use quartz glass.
Such as：The a length of 300-800nm of electromagnetic radiation as waves to be shielded, optimum matching parameter are：The metal level is thickness
25nm gold thin film, substrate are thickness 20nm polytetrafluoroethylene (PTFE), and metal nanoparticle is Argent grain, and diameter is in several nanometers of amounts
Level.
The laminated type nanostructured that the present invention designs, effect is constrained by phasmon of the electromagnetic radiation in micro-structural certainly
Should, it can be achieved externally to come the broadband of electromagnetic radiation, high efficiency shielding.Specific advantage is as follows：
1. this nano-stack formula ELECTROMAGNETIC RADIATION SHIELDING structure, using mutually dry based on different spaces surface plasma wave
" bulk plasmon " technology related to, it can effectively suppress sensitiveness of the ELECTROMAGNETIC RADIATION SHIELDING characteristic to incident angle, thus with width
Frequency band, efficient advantage.
2. this nano-stack formula ELECTROMAGNETIC RADIATION SHIELDING structure, its " bulk plasmon " technology is metal level and nano combined
The effect that surface plasma wave interferes in layer, thus the design of its shielding character has more flexibility and tuning performance.
3. this nano-stack formula ELECTROMAGNETIC RADIATION SHIELDING structure, other more complicated structure ELECTROMAGNETIC RADIATION SHIELDING technologies can be used as
The basis of design and reference, such as introduce more metal levels or nanometer composite layer, thus possess universality and representativeness.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the reflectivity for the nano-stack structure that body fill factor, curve factor is 7%.
Fig. 3 is the transmitance for the nano-stack structure that body fill factor, curve factor is 7%.
Fig. 4 is the reflectivity for the nano-stack structure that body fill factor, curve factor is 13%.
Fig. 5 is the transmitance for the nano-stack structure that body fill factor, curve factor is 13%.
Fig. 6 is the reflectivity for the nano-stack structure that body fill factor, curve factor is 17%.
Fig. 7 is the transmitance for the nano-stack structure that body fill factor, curve factor is 17%.
Fig. 8 is the reflectivity for the nano-stack structure that body fill factor, curve factor is 23%.
Fig. 9 is the transmitance for the nano-stack structure that body fill factor, curve factor is 23%.
Figure 10 is the light transmission rate of nano-stack structure and the dependence of incident angle (body fill factor, curve factor is 23%).
Embodiment
Include successively as shown in figure 1, the ELECTROMAGNETIC RADIATION SHIELDING structure of the present invention is bottom-up：Supporting layer 1, metal level 2, base
Bottom 3 and metal nanoparticle 4, wherein substrate 3 and metal nanoparticle 4 form nanometer composite layer, and thickness is received tens to hundreds of
Rice magnitude, wherein the body fill factor, curve factor of metal nanoparticle is in 5~30% (i.e. volume fraction) scopes.Metal layer thickness is greater than
The penetration depth of electromagnetic radiation to be shielded, often in tens to hundreds of nanometer scales.
When the composite construction outermost layer is incided in electromagnetic radiation, electromagnetic radiation is by the metal nano in nanometer composite layer
Particle surface triggers surface plasma effect, so as to form localization and non-localized plasma wave in the composite bed.Together
When, the electromagnetic radiation also will form phasmon surface plasma wave in metal level 2 and the interface of substrate 3.Above two etc.
Ion wave will interfere cancellation effect so that and most incident electromagnetic waves are trapped in the laminated type nanostructured, from
And reach the technique effect of shielding extraneous electromagnetic radiation.Relative to traditional surface plasma body technique, the technical spirit is " body
Plasma " technology.
Because the generation of phasmon surface plasma wave is to the dependence of material surface characteristic, externally carry out electromagnetic radiation
Shield effectiveness be also dependent upon the characteristic of the structure in itself, such as metal level and base material, thickness and wherein metal nano
Body fill area attribute of grain etc..
An instantiation given below：Supporting layer 1 is quartz glass；Metal level 2 is thickness 25nm gold thin films；Substrate 3
For thickness 20nm polytetrafluoroethylene (PTFE)；Metal nanoparticle 4 is Argent grain, and diameter is in several nanometer scales.Electromagnetic radiation to be shielded
Wavelength is 300-800nm.
For the nano-stack formula ELECTROMAGNETIC RADIATION SHIELDING structure, we analyze electromagnetic radiation vertical incidence nanometer composite layer
During surface, there is electromagnetic shielding characteristic possessed by the structure design of different metal alloy granular solidses fill factor, curve factor.Analysis result
Respectively as shown in Fig. 2 to Fig. 9.
As seen from the figure, the setting of body fill factor, curve factor parameter directly decides the overall reflectivity and light transmission rate of structure：
When nano-metal particle body filling proportion is relatively low, effective plasma wave is not formed in nanometer composite layer, causes to reduce
Externally carry out the imprison effect of electromagnetic radiation, thus transmitance is higher, shield effectiveness is poor；And when body is filled up to proper ratio
When 23%, the structure has extremely low electromagnetic radiation transmitance, and 15% is below in 300-800nm frequency ranges, it is meant that good
ELECTROMAGNETIC RADIATION SHIELDING effect.Simultaneously it has been found that when nano-metal particle body filling proportion continues to improve, electromagnetic radiation is saturating
Rate is crossed close to saturation, fluctuate very little.
The ELECTROMAGNETIC RADIATION SHIELDING characteristic and the dependence of incident EM radiation angles degree of the structure are as shown in Figure 10.Due to this
Structure can effectively be pressed down using " bulk plasmon " technology interfered based on different spaces surface plasma wave
Sensitiveness of the ELECTROMAGNETIC RADIATION SHIELDING characteristic processed to incident angle.
Claims (7)
- A kind of 1. ELECTROMAGNETIC RADIATION SHIELDING structure, it is characterised in that：Including bottom-up supporting layer (1), the metal level set gradually And nanometer composite layer (2)；The thickness of the metal level is more than the penetration depth of electromagnetic radiation to be shielded, the thickness of metal level (2) Thickness of the degree more than or equal to substrate (3)；The main body of the nanometer composite layer is substrate (3), wherein filled with metal nano Grain (4), the body fill factor, curve factor of metal nanoparticle is in 5~30% scopes, the thickness and material of metal level and nanometer composite layer Configuration meets phasmon of the electromagnetic radiation in micro-structural from effect of restraint.
- 2. ELECTROMAGNETIC RADIATION SHIELDING structure according to claim 1, it is characterised in that：The thickness of the nanometer composite layer is several Ten to hundreds of nanometer scales, the thickness of the metal level is in tens to hundreds of nanometer scales.
- 3. ELECTROMAGNETIC RADIATION SHIELDING structure according to claim 1, it is characterised in that：The material of the substrate is polytetrafluoroethyl-ne Alkene, calcirm-fluoride or magnesium fluoride.
- 4. ELECTROMAGNETIC RADIATION SHIELDING structure according to claim 1, it is characterised in that：The material of the metal level is gold, silver Or aluminium.
- 5. ELECTROMAGNETIC RADIATION SHIELDING structure according to claim 1, it is characterised in that：The material of the metal nanoparticle is Gold or silver.
- 6. ELECTROMAGNETIC RADIATION SHIELDING structure according to claim 1, it is characterised in that：The supporting layer is quartz glass.
- 7. ELECTROMAGNETIC RADIATION SHIELDING structure according to claim 1, it is characterised in that：The a length of 300- of electromagnetic radiation as waves to be shielded 800nm, then the metal level be thickness 25nm gold thin film, substrate be thickness 20nm polytetrafluoroethylene (PTFE), metal nanoparticle For Argent grain, diameter is in several nanometer scales.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110267382A (en) * | 2019-06-26 | 2019-09-20 | 深圳市鑫汇科股份有限公司 | Inhale wave apparatus and electromagnetic heating apparatus |
| CN110913675A (en) * | 2019-12-06 | 2020-03-24 | 无锡环宇电气有限责任公司 | Radiation-proof anti-static nano coating and electrical control cabinet thereof |
| CN112740848A (en) * | 2018-11-19 | 2021-04-30 | 北川工业株式会社 | Magnetic shield |
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