CN104893605B - Electromagnetic shielding suction wave plate - Google Patents

Electromagnetic shielding suction wave plate Download PDF

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Publication number
CN104893605B
CN104893605B CN201510260692.8A CN201510260692A CN104893605B CN 104893605 B CN104893605 B CN 104893605B CN 201510260692 A CN201510260692 A CN 201510260692A CN 104893605 B CN104893605 B CN 104893605B
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Prior art keywords
parts
layer
electromagnetic shielding
wave
wave plate
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CN201510260692.8A
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CN104893605A (en
Inventor
金闯
杨晓明
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Jiangsu Stick New Materials Polytron Technologies Inc
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Jiangsu Stick New Materials Polytron Technologies Inc
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Priority to CN201710724241.4A priority Critical patent/CN108084906B/en
Priority to CN201710724856.7A priority patent/CN107739581B/en
Priority to CN201710724199.6A priority patent/CN108617153B/en
Priority to CN201510260692.8A priority patent/CN104893605B/en
Application filed by Jiangsu Stick New Materials Polytron Technologies Inc filed Critical Jiangsu Stick New Materials Polytron Technologies Inc
Priority to CN201710724245.2A priority patent/CN108084908B/en
Priority to CN201710724243.3A priority patent/CN108084907B/en
Priority to CN201710724858.6A priority patent/CN108093612B/en
Priority to CN201710724811.XA priority patent/CN107858115B/en
Priority to CN201710724316.9A priority patent/CN107743357B/en
Publication of CN104893605A publication Critical patent/CN104893605A/en
Priority to PCT/CN2015/099353 priority patent/WO2016184115A1/en
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    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/062—Copolymers with monomers not covered by C08L33/06
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    • 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
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/048—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of particles
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    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/14—Solid materials, e.g. powdery or granular
    • 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
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    • 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
    • H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2293—Oxides; Hydroxides of metals of nickel
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    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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Abstract

The present invention discloses one kind electromagnetic shielding and inhales wave plate, including graphite flake, suction ripple layer and separated type material layer as reflecting layer, and the first adhesive layer is provided between the graphite flake, suction ripple layer；The second adhesive layer is provided between the suction ripple layer, separated type material layer；The suction ripple layer is composed of the following components：Wave-absorbing powder, butyl acrylate, acrylic acid, Isooctyl acrylate monomer, methyl methacrylate, vinyl acetate, the hydroxyl ethyl ester of methacrylic acid 2, Sodium Polyacrylate, methyl ethyl ketone peroxide；The wave-absorbing powder is composed of the following components：BaFe12O19, nickel sesquioxide, Nano graphite powder, naphthoic acid cobalt, unsaturated polyester (UP), acrylic compounds levelling agent.Wave absorbing patch of the present invention reaches 88% in the attenuation rate of 2 ~ 10GHz electromagnetic waves, and it is gluing to not only improve polymer, also mixed powder is uniformly dispersed in the polymer, so as to ensure that the reliability of electromagnetic performance.

Description

Electromagnetic shielding suction wave plate
Technical field
The invention belongs to technical field of electronic materials, more particularly to a kind of electromagnetic shielding suction wave plate.
Background technology
With the development of electronics industry, increasing electric equipment products has come into the life of people, and these products The influence for the Electromagnetic Radiation on Environment brought also increasingly increases.The electromagnetic wave of electronic product release, can give other electronics of surrounding Equipment belt carrys out electromagnetic interference, makes its operation irregularity；Health can also be caused harm simultaneously.Therefore, research and development can weaken electricity The absorbing material of magnetic radiation, has become the heat subject of material science concern.
Absorbing material is the class material for referring to effectively absorb incident electromagnetic wave and make it decay, and it passes through different damages Incident electromagnetic wave is changed into heat energy or other form of energy to reach the purpose of suction ripple by consumption mechanism.In absorbing material, paster Type absorbing material thickness of thin, it is easy to use, for reduction electromagnetic radiation, prevent electromagnetic interference from having good effect, be relatively adapted to Apply in electronic product.And the main trend of electronic product development is miniaturization, Highgrade integration, interiors of products space is relative It is narrow and small.Therefore, on the premise of absorbing property is ensured how by material manufacture enough to it is thin be the biggest problem that people face.
The content of the invention
The present invention provides a kind of electromagnetic shielding and inhales wave plate declining in 2 ~ 10GHz electromagnetic waves with wave plate, the electromagnetic shielding is inhaled Lapse rate reaches 88%, and it is gluing to not only improve polymer, also mixed powder is uniformly dispersed in the polymer, so as to ensure that electricity The reliability of magnetic property.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：One kind electromagnetic shielding suction wave plate, including as anti- Penetrate the graphite flake of layer, inhale ripple layer and separated type material layer, the first adhesive layer is provided between the graphite flake, suction ripple layer；It is described to inhale The second adhesive layer is provided between ripple layer, separated type material layer；
The suction ripple layer is composed of the following components：
100 parts of wave-absorbing powder,
20 ~ 35 parts of butyl acrylate,
10 ~ 20 parts of acrylic acid,
20 ~ 35 parts of Isooctyl acrylate monomer,
10 ~ 30 parts of methyl methacrylate,
1 ~ 3 part of vinyl acetate,
0.1 ~ 1 part of 2-hydroxyethyl methacry-late,
0.5 ~ 2 part of Sodium Polyacrylate,
0.4 ~ 1 part of methyl ethyl ketone peroxide；
The wave-absorbing powder is composed of the following components：
BaFe12O19100 parts,
40 ~ 55 parts of nickel sesquioxide,
4 ~ 8 parts of Nano graphite powder,
10 ~ 15 parts of naphthoic acid cobalt,
50 ~ 60 parts of unsaturated polyester (UP),
40 ~ 50 parts of acrylic compounds levelling agent.
Further improved technical scheme is as follows in above-mentioned technical proposal：
1st, in such scheme, BaFe in the wave-absorbing powder12O19, nickel sesquioxide, Nano graphite powder and naphthoic acid cobalt according to 10：4：1：2 weight ratios are mixed.
2nd, in such scheme, the separated type material layer is off-style paper layer or release film layer.
3rd, in such scheme, first adhesive layer, the second adhesive layer are esters of acrylic acid adhesive layer.
4th, in such scheme, the unsaturated polyester (UP) synthesized by maleic anhydride, phthalic anhydride and propane diols and Into.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：
1st, present invention electromagnetic shielding is with wave plate is inhaled, and it inhales ripple layer using composite wave-absorbing powder BaFe12O19100 parts, three oxidations 20 ~ 35 parts of two nickel, Nano graphite powder, naphthoic acid cobalt and butyl acrylate, 10 ~ 20 parts of acrylic acid, 20 ~ 35 parts of Isooctyl acrylate monomer, Methyl methacrylate 10 ~ 30, vinyl acetate 1 ~ 3,0.1 ~ 1 part of synergy of 2-hydroxyethyl methacry-late, with stronger Electromaganic wave absorbing property, 88% is reached in the attenuation rate of 2 ~ 10GHz electromagnetic waves, further 0.5 ~ 2 part of Sodium Polyacrylate of addition, mistake 0.4 ~ 1 part of MEKP, it is gluing to not only improve polymer, also mixed powder is uniformly dispersed in the polymer, so as to protect The reliability of electromagnetic performance is demonstrate,proved；Secondly, unsaturated polyester (UP), acrylic compounds levelling agent are further equipped with formula and is improved entirely The heat conductivility of ripple layer is inhaled, is conducive to the heat expanding for producing electromagnetic wave, the stability and product for improving performance use the longevity Life.
2nd, present invention electromagnetic shielding is with wave plate is inhaled, and it includes graphite flake, suction ripple layer and the separated type material layer as reflecting layer, The first adhesive layer is provided between the graphite flake, suction ripple layer；It is gluing that second is provided between the suction ripple layer, separated type material layer Layer；Material thickness is very thin, and general thickness is less than 0.8mm；The setting in reflecting layer can form multiple absorption, significantly improve material Absorbing property；The setting of insulating barrier improves the outward appearance of wave absorbing patch, and it is improved while effective electromagnetic wave absorption Its proof voltage punctures effect.
Brief description of the drawings
Accompanying drawing 1 is that electromagnetic shielding of the invention inhales wave plate structural representation.
In the figures above：1st, graphite flake；2nd, ripple layer is inhaled；3rd, separated type material layer；4th, the first adhesive layer；5th, the second adhesive layer.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Embodiment 1 ~ 4：One kind electromagnetic shielding is with inhaling wave plate, including graphite flake 1 as reflecting layer, inhales ripple layer 2 and release Material layer 3, the first adhesive layer 4 is provided between the graphite flake 1, suction ripple layer 2；Between the suction ripple layer 2, separated type material layer 3 It is provided with the second adhesive layer 5；
The component and content for inhaling ripple layer 2 is as shown in table 1：
Table 1
Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4
Wave-absorbing powder 100 parts 100 parts 100 parts 100 parts
Butyl acrylate 20 parts 32 parts 30 parts 28 parts
Acrylic acid 10 parts 15 parts 18 parts 20 parts
Isooctyl acrylate monomer 25 parts 22 parts 32 parts 35 parts
Methyl methacrylate 18 parts 26 parts 12 parts 28 parts
Vinyl acetate 1 part 2.8 part 1.8 part 2 parts
2-hydroxyethyl methacry-late 0.2 part 0.5 part 0.8 part 0.6 part
Sodium Polyacrylate 1.5 part 2 parts 1.2 part 0.9 part
Methyl ethyl ketone peroxide 0.6 part 0.9 part 0.6 part 0.8 part
The content groups as shown in Table 2 of the wave-absorbing powder are grouped into：
Table 2
Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4
BaFe12O19 100 parts 100 parts 100 parts 100 parts
Nickel sesquioxide 38 parts 40 parts 42 parts 40 parts
Nano graphite powder 12 parts 10 parts 9 parts 10 parts
Naphthoic acid cobalt 19 parts 20 parts 22 parts 20 parts
Unsaturated polyester (UP) 52 parts 60 parts 55 parts 50 parts
Acrylic compounds levelling agent 40 parts 50 parts 48 parts 42 parts
The thickness of above-mentioned first adhesive layer 5 is less than the thickness of the second adhesive layer 6, and the thickness of second adhesive layer 7 is less than 3rd adhesive layer 7.
The thickness ratio of above-mentioned PET insulating barriers 1 and layer of polypropylene foil 10 is 10：4~6.
Above-mentioned unsaturated polyester (UP) is synthesized by maleic anhydride, phthalic anhydride and propane diols and formed.
Embodiment 1 ~ 4 is as shown in table 3 in the maximum reflection coefficient and effective bandwidth of 2 ~ 18GHz frequency ranges：
Table 3
Inhale ripple thickness degree Maximum reflection coefficient（dB） ≤ -8 dB effective bandwidths（GHz）
Embodiment 1 0.2mm -21 2~13
Embodiment 2 0.4mm -23 2~15
Embodiment 3 0.6mm -30 2~16
Embodiment 4 0.8mm -35 2~18
Inhale the electromagnetic wave that ripple layer discharges electronic product and heat energy or other forms are converted into modes such as electrical loss, magnetic losses Energy to reach the effect of reduction electromagnetic radiation, have preferable absorption in the range of 2 ~ 18GHz, can be by incident electromagnetic wave Reflect resorption ripple layer and formed and repeatedly absorbed.
The above-mentioned thickness of PET insulating barriers 1 is 6 microns；The thickness ratio of the PET insulating barriers 1 and layer of polypropylene foil 10 is 10： 5。
Above-described embodiment has the preparation technology that ripple layer is inhaled in the Protection glue band for inhaling wave energy, comprises the following steps：
The first step：By BaFe12O19100 parts, 38 ~ 42 parts of nickel sesquioxide, 9 ~ 12 parts of Nano graphite powder, naphthoic acid cobalt 18 ~ 22 Part, 50 ~ 60 parts of unsaturated polyester (UP), 40 ~ 50 parts of acrylic compounds levelling agent are well mixed, and stir to form mixed in 84 ~ 86 DEG C of conditions Close powder；
Second step：By 20 ~ 35 parts of butyl acrylate, 10 ~ 20 parts of acrylic acid, 20 ~ 35 parts of Isooctyl acrylate monomer, metering system Sour methyl esters 10 ~ 30, vinyl acetate 1 ~ 3,0.1 ~ 1 part of 2-hydroxyethyl methacry-late, 0.5 ~ 2 part of Sodium Polyacrylate and the first step Mixed powder mixing, and scattered 1 ~ 2 hour through high speed agitator, so that well mixed form mixture；
3rd step：The mixture of second step is heated in a kettle. to be incubated after 80 ~ 85 DEG C, point 1 in insulating process ~ 3 0.4 ~ 1 part of addition methyl ethyl ketone peroxides, which are obtained, inhales ripple mixed liquor, and the soaking time is 4 ~ 10 hours；
4th step：The suction ripple mixed liquor that 3rd step is obtained is coated on substrate；
5th step：Baking is carried out to the suction ripple mixed liquor in the 4th step and forms suction ripple layer.
During using above-mentioned electromagnetic shielding with wave plate is inhaled, with stronger electromaganic wave absorbing property, in 2 ~ 10GHz electromagnetic waves Attenuation rate reaches 88%, and further 0.5 ~ 2 part of Sodium Polyacrylate of addition, 0.4 ~ 1 part of methyl ethyl ketone peroxide, not only improve polymer It is gluing, also mixed powder is uniformly dispersed in the polymer, so as to ensure that the reliability of electromagnetic performance；Secondly, in formula Further it is equipped with unsaturated polyester (UP), acrylic compounds levelling agent and improves the whole heat conductivility for inhaling ripple layer, is conducive to electromagnetic wave The heat expanding of generation, improves the stability and product service life of performance.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.

Claims (5)

1. one kind electromagnetic shielding suction wave plate, it is characterised in that：Including the graphite flake as reflecting layer（1）, inhale ripple layer（2）With from The section bar bed of material（3）, the graphite flake（1）, inhale ripple layer（2）Between be provided with the first adhesive layer（4）；The suction ripple layer（2）, it is release Material layer（3）Between be provided with the second adhesive layer（5）；
The suction ripple layer（2）It is composed of the following components：
100 parts of wave-absorbing powder,
20 ~ 35 parts of butyl acrylate,
10 ~ 20 parts of acrylic acid,
20 ~ 35 parts of Isooctyl acrylate monomer,
10 ~ 30 parts of methyl methacrylate,
1 ~ 3 part of vinyl acetate,
0.1 ~ 1 part of 2-hydroxyethyl methacry-late,
0.5 ~ 2 part of Sodium Polyacrylate,
0.4 ~ 1 part of methyl ethyl ketone peroxide；
The wave-absorbing powder is composed of the following components：
BaFe12O19100 parts,
38 ~ 42 parts of nickel sesquioxide,
9 ~ 12 parts of Nano graphite powder,
18 ~ 22 parts of naphthoic acid cobalt,
50 ~ 60 parts of unsaturated polyester (UP),
40 ~ 50 parts of acrylic compounds levelling agent.
2. electromagnetic shielding according to claim 1 suction wave plate, it is characterised in that：BaFe in the wave-absorbing powder12O19, three Two nickel, Nano graphite powder and naphthoic acid cobalt are aoxidized according to 10：4：1：2 weight ratios are mixed.
3. electromagnetic shielding according to claim 1 suction wave plate, it is characterised in that：The separated type material layer（3）To be release Ply of paper or release film layer.
4. electromagnetic shielding according to claim 1 suction wave plate, it is characterised in that：First adhesive layer（4）, the second glue Adhesion coating（5）It is esters of acrylic acid adhesive layer.
5. electromagnetic shielding according to claim 1 suction wave plate, it is characterised in that：The unsaturated polyester (UP) is by maleic two Acid anhydrides, phthalic anhydride and propane diols synthesis are formed.
CN201510260692.8A 2015-05-21 2015-05-21 Electromagnetic shielding suction wave plate Active CN104893605B (en)

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CN201710724199.6A CN108617153B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for weakening electromagnetic radiation
CN201510260692.8A CN104893605B (en) 2015-05-21 2015-05-21 Electromagnetic shielding suction wave plate
CN201710724811.XA CN107858115B (en) 2015-05-21 2015-05-21 Patch type wave absorbing material
CN201710724245.2A CN108084908B (en) 2015-05-21 2015-05-21 Wave absorbing plate
CN201710724856.7A CN107739581B (en) 2015-05-21 2015-05-21 Heat-conducting wave-absorbing patch
CN201710724858.6A CN108093612B (en) 2015-05-21 2015-05-21 Wave-absorbing material for electromagnetic shielding
CN201710724241.4A CN108084906B (en) 2015-05-21 2015-05-21 Electromagnetic wave-absorbing plate for electric appliance product
CN201710724316.9A CN107743357B (en) 2015-05-21 2015-05-21 Wave absorbing plate for electronic product
CN201710724243.3A CN108084907B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for attenuating electromagnetic radiation
PCT/CN2015/099353 WO2016184115A1 (en) 2015-05-21 2015-12-29 Wave absorbing patch for electromagnetic shielding

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CN201710724856.7A Division CN107739581B (en) 2015-05-21 2015-05-21 Heat-conducting wave-absorbing patch
CN201710724811.XA Division CN107858115B (en) 2015-05-21 2015-05-21 Patch type wave absorbing material
CN201710724316.9A Division CN107743357B (en) 2015-05-21 2015-05-21 Wave absorbing plate for electronic product
CN201710724241.4A Division CN108084906B (en) 2015-05-21 2015-05-21 Electromagnetic wave-absorbing plate for electric appliance product
CN201710724858.6A Division CN108093612B (en) 2015-05-21 2015-05-21 Wave-absorbing material for electromagnetic shielding
CN201710724243.3A Division CN108084907B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for attenuating electromagnetic radiation
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CN201710724199.6A Active CN108617153B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for weakening electromagnetic radiation
CN201710724243.3A Active CN108084907B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for attenuating electromagnetic radiation
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CN201510260692.8A Active CN104893605B (en) 2015-05-21 2015-05-21 Electromagnetic shielding suction wave plate
CN201710724856.7A Active CN107739581B (en) 2015-05-21 2015-05-21 Heat-conducting wave-absorbing patch
CN201710724811.XA Active CN107858115B (en) 2015-05-21 2015-05-21 Patch type wave absorbing material
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CN201710724199.6A Active CN108617153B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for weakening electromagnetic radiation
CN201710724243.3A Active CN108084907B (en) 2015-05-21 2015-05-21 Wave-absorbing patch for attenuating electromagnetic radiation
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WO2016184115A1 (en) 2016-11-24
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