CN203876308U - Electromagnetic wave absorption device - Google Patents
Electromagnetic wave absorption device Download PDFInfo
- Publication number
- CN203876308U CN203876308U CN201420169992.6U CN201420169992U CN203876308U CN 203876308 U CN203876308 U CN 203876308U CN 201420169992 U CN201420169992 U CN 201420169992U CN 203876308 U CN203876308 U CN 203876308U
- Authority
- CN
- China
- Prior art keywords
- film
- electromagnetic wave
- magnetic
- tin oxide
- magnetic metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Laminated Bodies (AREA)
- Hard Magnetic Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model discloses an electromagnetic wave absorption device. The electromagnetic wave absorption device is of a three-layer structure comprising a tin oxide film with a set surface resistance value, a composite film made of polymers filled with magnetic metal particles, and a natural graphite film or an artificially synthesized graphite film. According to the electromagnetic wave absorption device, the attenuation effect of electromagnetic waves can be obviously improved; particularly, resistance loss absorption to electromagnetic waves within 1GHz is very good. Due to application of the graphite film in the absorption device, the comprehensive electromagnetic wave absorption effect of the three-layer complex is improved, and the device has a heat dissipation function, so that the composite device has wide application prospects in the field of electronic parts and components.
Description
Technical field
The utility model relates to electromagnetic wave field, especially relates to a kind of electro-magnetic wave absorption device.
Background technology
In high frequency and integrated electronic devices and components, the interference of electromagnetic radiation is on the rise, and scientifically uses absorbing material to become the effective means that suppresses electromagnetic interference.Material is relevant with the electromagnetic parameter of material to electromagnetic absorption, by dielectric parameter and magnetic conductivity general performance, is decided.These parameters are determining savings and the consumption of the electromagnetic energy of dielectric material.Different materials, their DIELECTRIC CONSTANTS and magnetic conductivity μ are different often, and their real part (ε ' and μ ') and imaginary part (ε ' ' and μ ' ') also along with frequency, change.Dielectric constant and magnetic conductivity imaginary part compare with its real part very little in, negligible imaginary part, material can only see through electromagnetic wave, and can not electromagnetic wave absorption, at this moment can be referred to as electromagnetic wave transparent material.Correspondingly, when the imaginary part of dielectric constant and magnetic conductivity can not be ignored, material just has the ability of electromagnetic wave absorption, is exactly at this time absorbing material.In addition, also relevant with the surface matching situation of material for electromagnetic absorption.This just requires electromagnetic wave the smaller the better at the surface reflection of material, and the electromagnetic wave that enters like this material internal is just likely absorbed.Therefore, the design of absorbing material can go to carry out around two aspects: the one, and the impedance matching situation of material surface, the 2nd, the wave-sucking performance of material itself.
According to EM theory, when electromagnetic wave incides another medium from free space, only have the impedance of free space and the impedance of absorbing material to keep approximately equal in wide as far as possible frequency range, the electromagnetic wave of reflection just can be reduced to minimum.The impedance of material is the root mean square of magnetic conductivity and real part of permittivity ratio.Generally, electromagnetic wave is to inject electromagnetic wave absorb by air, and the impedance of air is 377 Ω, if the impedance of electromagnetic wave absorb approaches the impedance of air, most of electromagnetic wave will enter this absorber; If far below the impedance of air, most of electromagnetic wave is reflected back toward in air.
For absorbing, crucial factor is to improve the electromagnetic consumable of material, make electromagnetic wave energy change into the energy of heat energy or other form, thereby electromagnetic wave is absorbed to greatest extent in medium.The μ ' ' of material and ε ' ' are larger, and absorbent properties are better.Loss mechanism can be divided into three classes: the one, and the resistor-type loss relevant with the electrical conductivity of material, electrical conductivity is larger, and macroscopical electric current that carrier causes (eddy current that the electric current that electric field causes and changes of magnetic field cause) is larger, is conducive to electromagnetic energy and changes into heat energy; The 2nd, the dielectric loss relevant with electric polarization (repeatedly polarization cause " friction " act on), dielectric polarization process has electron cloud displacement polarization, ionic band, polarizable medium electric moment to turn to polarization, ferroelectric electricdomain to turn to polarization and domain wall displacement, macromolecule Atom to roll into a ball local electric moment and turn to polarization, defect dipole polarization etc.; The 3rd, the magnetic loss relevant with dynamic magnetization process " friction " of the remagnetization (effect), its main source is that magnetic hysteresis, magnetic domain turn to, domain wall displacement, magnetic domain natural resonance etc.At present, ferrite, magnetic metal and ferroelectric material are used for microwave absorption, are because its magnetic hysteresis, electric hysteresis loss are large.The conductive fillers such as carbon black, graphite, nonmagnetic metal add in other medium as absorbing material, have in fact increased resistor-type loss.During design absorbing material, need consider above multiple loss.
In existing anti-electromagnetic interference technology, metal film or metal forming are owing to conducting electricity very well, and resistance loss is large, but more electromagnetic wave is reflected on surface.For the compound electromagnetic wave absorb of existing magnetic metal particle filled polymer, its sheet resistance is more than 106 Ω/, and the electromagnetic wave penetrability of material is good, and it inhales ripple principle is magnetic hystersis loss, can be by electromagnetic energy energy transform into heat energy.But this composite electromagnetic absorber has in the little feature of the corresponding electromagnetic parameter imaginary part of low-frequency range, therefore exist low-frequency electromagnetic wave to absorb weak shortcoming, thickness is no more than to the absorber of 0.1 mm, in the frequency band of 1GHz, because thin thickness causes forming effective absorption to electromagnetic wave.In addition, the heat energy being converted by electromagnetic energy can cause the high temperature of electronic devices and components, for the intelligent terminal electron consumer goods of high frequency, integrated and multifunction, himself running temperature is in a higher scope, and new heat energy causes the rising of electronic devices and components fault rate undoubtedly.Therefore, can to have the absorber of better assimilation effect at the electromagnetic wave compared with (being no more than 0.1 mm) under minimal thickness frequency being less than to 1GHz be particularly important for one of structure.
Summary of the invention
The utility model provides a kind of electro-magnetic wave absorption device, and this electro-magnetic wave absorption device comprises that tin oxide film, magnetic metal particle filled polymer composite membrane and natural stone ink film or the artificial-synthetic stone's ink film of setting sheet resistance value are total to three-decker.
Preferably, tin oxide film is on upper strata, and magnetic metal particle filled polymer composite membrane is intermediate layer, and bottom is graphite film.
Preferably, the sheet resistance of described tin oxide film is within the scope of 10 ~ 5000 Ω, and it can increase the resistance loss of electromagnetic wave absorb in low-frequency range.
Preferably, monodispersed magnetic metal particle combines by polymeric binder, and its sheet resistance is more than 106 Ω.
Preferably, graphite film is natural stone ink film or artificial-synthetic stone's ink film, its sheet resistance is in 200 m Ω, electrical conductivity is more than 104 S/m, can form effective reflection to its surperficial electromagnetic wave of incident, cause the secondary magnetic loss of magnetic metal particle and the secondary resistance loss of tin oxide film, thereby strengthen comprehensive assimilation effect, especially frequency is less than the electromagnetic radiation of 1 GHz.
Accompanying drawing explanation
Fig. 1 is according to the sectional view of the electro-magnetic wave absorption device of the utility model embodiment 1.
Fig. 2 is the cross sectional view of magnetic metal particle filled polymer composite membrane in embodiment 1.
Fig. 3 is the electro-magnetic wave absorption collection of illustrative plates of electro-magnetic wave absorption device in embodiment 1.
Fig. 4 is the electro-magnetic wave absorption collection of illustrative plates of Single Magnetic metallic particles filled polymer composite membrane.
The specific embodiment
Below with reference to accompanying drawings the utility model is described in more detail, has wherein represented preferred embodiment of the present utility model, should be appreciated that those skilled in the art can revise the utility model described here and still realize the beneficial effects of the utility model.Therefore, following description is appreciated that extensively knowing for those skilled in the art, and not as to restriction of the present utility model.
An object of the present utility model is to construct a kind of electro-magnetic wave absorption device being comprised of three-decker, makes it thinner in the situation that, to low-frequency electromagnetic wave, form effective absorption.
Another object of the present utility model is that the electromagnetic wave absorb of constructing has the function of inhaling ripple and heat radiation concurrently, to improving the working environment of electronic devices and components, provides favourable help, and this is very important concerning the intelligent terminal electron consumer goods of ultrathin and high frequency.
In order to improve the electromagnetic wave absorptivity in its low frequency, can increase at the plane of incidence of magnetic metal filled polymer composite membrane the absorbed layer of one deck resistance loss.If select the electromagnetic wave absorb higher than the sheet resistance of 5000 Ω/, give prominence to aspect penetrability, but have the problem that resistance loss is low.If select surface impedance lower than the electromagnetic wave absorb of 10 Ω/, the chance that electromagnetic wave is reflected increases.Therefore a way of the present utility model is structure layer of surface resistance at the thin layer of 10 ~ 5000 Ω/ on the surface of composite membrane, improves the absorption of low-frequency electromagnetic wave.For material composition, that select is semiconductor doping oxide S nO2, rather than common conducting high polymers thing.Because conducting high polymers thing being difficult to aspect reliability meets the demands, the easily aging sharply rising that causes resistance in damp and hot environment, thus affect it to electromagnetic resistance loss behavior.And the chemical stability of tin oxide is superior, can be at its resistance of regulated in wider range by semiconductor doping technology, under very thin thickness, (in 1 μ m) can realize above-mentioned resistance value scope, can obviously not increase the thickness of electromagnetic wave absorb.
Another related layer of the utility model is the opposite side increase one deck graphite film at magnetic metal filled polymer composite membrane, its effect has three aspects:: the one, utilize its good electric conductivity (conductance can up to 104 S/cm), and can produce obvious resistance loss to the electromagnetic wave that enters himself; The 2nd, because its sheet resistance is between 10 ~ 200 m Ω/, can form electromagnetic usable reflection, cause the secondary magnetic loss absorption of magnetic metal filled polymer composite membrane and the secondary resistance loss of tin oxide film and absorb; The 3rd, the thermal conductivity good (artificial-synthetic stone's ink film thermal conductivity can approach 2000 W/mK) in the x-y plane of graphite film itself, can be transferred to outer member by the heat rapid diffusion of generation.
According to the characteristic difference of every layer material and its preparation technology's feature, in the utility model, the manufacture method of three-decker electro-magnetic wave absorption device adopts following order: (1) prepares graphite film material, due to the inherent flexibility of graphite film, need to be attached on the plastic foils such as adhesive PET, PP or PE to increase its mechanical strength.(2) prepare the slurry of magnetic metal particle, polymeric binder and solvent composition.By adopting the modes such as press mold, spin coating, band painting, printing, spraying or roller coating to make the composite membrane of metallic particles filled polymer at graphite surface, its sheet resistance is 106 ~ 108 Ω/.(3) on composite membrane surface, pass through the SnO2 oxide semiconductor film of vapor phase method or liquid phase method synthesizing blender, control the content of impurity element and the thickness of film, obtain sheet resistance within the scope of 10 ~ 5000 Ω/.
Graphite film described in the utility model, can be natural stone ink film or artificial-synthetic stone's ink film, and the two difference is that artificial synthetic graphite film has 4 times of high thermal conductivities compared with natural stone ink film, and has better bending resistance folding endurance.The thickness of graphite film at 10 μ m between 200 μ m.With regard to artificial-synthetic stone's ink film, the thinner thermal conductivity of thickness and electrical conductivity are larger.
That magnetic metal particle described in the utility model includes but not limited to is spherical, square, sheet shape, needle-like, fibrous or other is irregularly shaped.The element composition of described metal material includes but not limited to metal and the alloys thereof such as iron, cobalt, nickel, niobium, chromium.Described metal dust particle size D50 is [1,200] micron, is preferably [20,80] micron, preferably [1,20] micron or [80,200] micron.The method of testing of D50 is laser particle size method, and its scope is interval to be represented with [a, b], and wherein a is D50 lower limit, and b is D50 higher limit,
Organic binder bond described in the utility model is thermoplastic polymer, include but not limited to: polyester resin, polyvinyl resin, Corvic, polypropylene, polystyrene, Merlon, nylon, epoxy resin, polyacrylic acid resinoid, polyurethane resin, polyvinyl butyral resin, PETG, polybutylene terephthalate (PBT), fiber-like resin, itrile group butadiene type rubber, styrene butadiene class rubber, butyl rubber, chlorinated polyethylene rubber, ethylene propylene rubber, acrylonitrile-butadiene rubber, polysulfide, silicon rubber, natural rubber etc.Yet optimal material will be selected to determine according to the concrete purposes of laminated film and the difference of manufacturing installation.
Solvent described in the utility model can be water, toluene, cyclohexanone, cyclohexane, ethyl acetate, dimethylbenzene etc. or its combination of at least two kinds.
In SnO 2 thin film described in the utility model, the element of doping can be indium, antimony, fluorine, molybdenum, tantalum etc., thereby obtain the compound films such as SnO2:In, SnO2:Sb, SnO2:F, SnO2:Mo, SnO2:Ta, while requiring controlled doping content to make film between 100 nm ~ 1 um, sheet resistance is within the scope of 10 ~ 5000 Ω/.
Tin oxide film described in the utility model can adopt vapor phase method preparation, as magnetron sputtering, electron beam evaporation, thermal evaporation, pulsed laser deposition, chemical vapour deposition (CVD) etc., according to the difference of synthetic method, chooses corresponding facility and raw material.
Tin oxide film described in the utility model also can adopt liquid phase method to obtain, and after configuration precursor solution, by modes such as roller coating, spraying, spin coatings, prepares on magnetic metal particle filled polymer composite membrane surface.
In general, the SnO 2 thin film being obtained compared with liquid phase method by vapor phase method, density is high, better crystallinity degree, at 200 nm thickness with the interior sheet resistance that obtains 100 Ω/.
Embodiment 1
Preparation according to graphite film, magnetic metal particle filled polymer composite membrane, tin oxide film sequentially obtains three layers of absorption plant of tin oxide film-magnetic metal filled composite film-graphite film, and its cross section is as shown in Figure 1.Wherein three layers of electromagnetic wave absorb are in centre, and a side is release film 11 and two-sided tape 12, and opposite side is one side adhesive tape 16 and diaphragm 17.Graphite film 15 is selected artificial-synthetic stone's ink film of 25 microns, and its sheet resistance is 0.032 Ω/.Magnetic metal particle filled composite film 14 is comprised of molybdenum permalloy Fe-Ni-Mo and polyvinyl butyral resin binding agent, and thickness is 0.050 mm or 0.075 mm.The thickness of tin oxide film 13 is 200 nm, by Sb element doping, improves its electric conductivity, and sheet resistance is 90 Ω/, and preparation method is magnetron sputtering method, and raw material are ceramic targets of Sb2O5 and SnO2 sintering.
Wave-absorbing effect for three layers of absorption plant of comparative illustration tin oxide film-magnetic metal filled composite film-graphite film, preparation is only containing the paster of magnetic metal molybdenum permalloy/polyvinyl butyral resin composite wave-absorbing film, and process, composition, thickness are identical with embodiment's 1.As shown in Figure 2, in sectional view, release film 21 and two-sided tape 22 are in a side, and one side adhesive tape 24 and diaphragm 25 are at opposite side, and centre is composite wave-absorbing film 23, it with in embodiment 1 14 identical, thickness is also 0.050 mm or 0.075 mm.
The assessment of Adoption Network vector analysis instrument obtains the wave-absorbing effect of sample.In embodiment 1 wave-absorbing effect of three layers of electromagnetic wave absorb of Sb doping SnO2 film-molybdenum permalloy filled composite film-electrographite film as shown in Figure 3, and only containing the wave-absorbing effect of the paster of magnetic metal molybdenum permalloy/polyvinyl butyral resin composite wave-absorbing film as shown in Figure 4.A in two figure, b represents different-thickness (a) 0.050 mm(b of metal filled composite membrane of polymer (being 23 in 14 in Fig. 1 or Fig. 2)) 0.075 mm.Fig. 3 compares known with Fig. 4, the electromagnetic wave absorb of three-decker has better assimilation effect, especially more obvious with interior advantage at 1 GHz, illustrate that secondary magnetic hystersis loss and resistance loss that the resistance loss of tin oxide film and the reflection of graphite film cause brought into play positive effect.
Embodiment 2
Equally, adopt aforementioned order to obtain three layers of absorption plant of tin oxide film-magnetic metal filled composite film-graphite film, wherein, graphite film is selected artificial-synthetic stone's ink film of 10 microns, and its sheet resistance is 0.072 Ω/.Magnetic metal particle filled composite film is comprised of iron-nickel alloy particle and polyethylene, and thickness is 0.050 mm.The thickness of tin oxide film is 300 nm, by F element doping, improves its electric conductivity, and sheet resistance is 80 Ω/, and preparation method is chemical vapour deposition (CVD).
Radiating effect for three layers of absorption plant of comparative illustration embodiment 2 tin oxide films-magnetic metal filled composite film-graphite film, the paster of the suction ripple film that preparation only forms containing iron-nickel alloy particle and polyethylene, process, composition, thickness are identical with embodiment's 2.
The paster that embodiment 2 is obtained and be only applied to respectively the back of business intelligence mobile phone display screen curtain containing the paster of the suction ripple film of iron-nickel alloy particle and polyethylene composition, and charge at the same time and play under the condition of audio/video file view screen heating situation (environment temperature is 25 degrees Celsius) after 1 hour, by Fluke Ti30 thermal imaging system, obtain heat distribution map, the maximum temperature of embodiment 2 is 46.8 degree, and the maximum temperature of the paster of the suction ripple film only forming containing iron-nickel alloy particle and polyethylene is 52.2 degree, and the Temperature Distribution that the paster of the suction ripple film that the Temperature Distribution of embodiment 2 correspondences more only forms containing iron-nickel alloy particle and polyethylene is corresponding is more even in relative broad range, there is no a large amount of concentrated heatings.Three layers of absorption plant of this explanation tin oxide film-magnetic metal filled composite film-graphite film not only have good electromagnetic wave absorption function, but also have heat sinking function concurrently, meet the integration requirement of smart electronics consumer goods antagonism electromagnetic interference and heat radiation.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (5)
1. an electro-magnetic wave absorption device, is characterized in that: this electro-magnetic wave absorption device comprises that tin oxide film, magnetic metal particle filled polymer composite membrane and natural stone ink film or the artificial-synthetic stone's ink film of setting sheet resistance value are total to three-decker.
2. device according to claim 1, is characterized in that: tin oxide film is on upper strata, and magnetic metal particle filled polymer composite membrane is intermediate layer, and bottom is graphite film.
3. device according to claim 1 and 2, is characterized in that: the sheet resistance of described tin oxide film is within the scope of 10 ~ 5000 Ω, and it can increase the resistance loss of electromagnetic wave absorb in low-frequency range.
4. device according to claim 3, is characterized in that: monodispersed magnetic metal particle combines by polymeric binder, and its sheet resistance is more than 106 Ω.
5. device according to claim 3, it is characterized in that: graphite film is natural stone ink film or artificial-synthetic stone's ink film, its sheet resistance is in 200 m Ω, electrical conductivity is more than 104 S/m, can form effective reflection to its surperficial electromagnetic wave of incident, cause the secondary magnetic loss of magnetic metal particle and the secondary resistance loss of tin oxide film, thereby strengthen comprehensive assimilation effect, especially frequency is less than the electromagnetic radiation of 1 GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420169992.6U CN203876308U (en) | 2014-04-10 | 2014-04-10 | Electromagnetic wave absorption device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420169992.6U CN203876308U (en) | 2014-04-10 | 2014-04-10 | Electromagnetic wave absorption device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203876308U true CN203876308U (en) | 2014-10-15 |
Family
ID=51676847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420169992.6U Expired - Fee Related CN203876308U (en) | 2014-04-10 | 2014-04-10 | Electromagnetic wave absorption device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203876308U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972710A (en) * | 2014-04-10 | 2015-10-14 | 苏州驭奇材料科技有限公司 | Electromagnetic wave absorption apparatus and preparation method thereof |
| CN105277803A (en) * | 2015-12-03 | 2016-01-27 | 哈尔滨幻石科技发展有限公司 | Wall structure for detecting product electromagnetic performance |
| CN110383964A (en) * | 2017-03-03 | 2019-10-25 | 日东电工株式会社 | Electromagnetic wave absorb and formed products with electromagnetic wave absorb |
-
2014
- 2014-04-10 CN CN201420169992.6U patent/CN203876308U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972710A (en) * | 2014-04-10 | 2015-10-14 | 苏州驭奇材料科技有限公司 | Electromagnetic wave absorption apparatus and preparation method thereof |
| CN104972710B (en) * | 2014-04-10 | 2017-08-25 | 苏州驭奇材料科技有限公司 | A kind of electro-magnetic wave absorption device and preparation method thereof |
| CN105277803A (en) * | 2015-12-03 | 2016-01-27 | 哈尔滨幻石科技发展有限公司 | Wall structure for detecting product electromagnetic performance |
| CN105277803B (en) * | 2015-12-03 | 2018-06-26 | 江山海维科技有限公司 | For the wall construction of product electromagnetic performance detection |
| CN110383964A (en) * | 2017-03-03 | 2019-10-25 | 日东电工株式会社 | Electromagnetic wave absorb and formed products with electromagnetic wave absorb |
| CN110383964B (en) * | 2017-03-03 | 2021-02-19 | 日东电工株式会社 | Electromagnetic wave absorber and molded article with electromagnetic wave absorber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| He et al. | Developing MXenes from wireless communication to electromagnetic attenuation | |
| Zuo et al. | Multimaterial 3D-printing of graphene/Li0. 35Zn0. 3Fe2. 35O4 and graphene/carbonyl iron composites with superior microwave absorption properties and adjustable bandwidth | |
| Huang et al. | Ultrathin flexible carbon fiber reinforced hierarchical metastructure for broadband microwave absorption with nano lossy composite and multiscale optimization | |
| Zhao et al. | Morphology-control synthesis of a core–shell structured NiCu alloy with tunable electromagnetic-wave absorption capabilities | |
| Lan et al. | Application progress of conductive conjugated polymers in electromagnetic wave absorbing composites | |
| Duan et al. | Microwave absorbing materials | |
| Xu et al. | Synthesis and characterization of novel coralloid polyaniline/BaFe12O19 nanocomposites | |
| Tan et al. | PANI/FeCo@ C composite microspheres with broadband microwave absorption performance | |
| Magisetty et al. | Nanocomposite engineered carbon fabric-mat as a passive metamaterial for stealth application | |
| Wang et al. | A Polypyrrole/CoFe 2 O 4/Hollow Glass Microspheres three-layer sandwich structure microwave absorbing material with wide absorbing bandwidth and strong absorbing capacity | |
| Wei et al. | Double-layer microwave absorber based on nanocrystalline Zn0. 5Ni0. 5Fe2O4/α-Fe microfibers | |
| US7336215B2 (en) | Electromagnetic radiation absorber based on magnetic microwires | |
| Gill et al. | Critical analysis of frequency selective surfaces embedded composite microwave absorber for frequency range 2–8 GHz | |
| CN104972708B (en) | One kind inhales the difunctional composite of wave dispersion heat and its manufacture method | |
| CN203876308U (en) | Electromagnetic wave absorption device | |
| Huang et al. | Facile synthesis of hollow Zn x Fe3–x O4@ porous MnO2/rGO conductive network composites for tunable electromagnetic wave absorption | |
| US10364511B1 (en) | Magneto dielectric composite materials and microwave applications thereof | |
| Bora et al. | Polyvinylbutyral–polyaniline nanocomposite for high microwave absorption efficiency | |
| Zhou et al. | Boosted interfacial polarization from the multidimensional core–shell–flat heterostructure CNP@ PDA@ GO/rGO for enhanced microwave absorption | |
| Wang et al. | The characterization and preparation of core–shell structure particles of carbon-sphere@ NiFe 2 O 4@ PPy as microwave absorbing materials in X band | |
| CN207719402U (en) | High power flush type polarization conversion antenna house | |
| Danlée et al. | Flexible multilayer combining nickel nanowires and polymer films for broadband microwave absorption | |
| CN104972710B (en) | A kind of electro-magnetic wave absorption device and preparation method thereof | |
| Qi et al. | Novel Microwave Absorber of Ni x Mn1–x Fe2O4/Carbonized Chaff (x= 0.3, 0.5, and 0.7) Based on Biomass | |
| Kim | Microwave absorbing properties of magnetic composite sheets for oblique incidence angles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 Termination date: 20150410 |
|
| EXPY | Termination of patent right or utility model |