CN109659703A - A kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure - Google Patents
A kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure Download PDFInfo
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- CN109659703A CN109659703A CN201811423226.7A CN201811423226A CN109659703A CN 109659703 A CN109659703 A CN 109659703A CN 201811423226 A CN201811423226 A CN 201811423226A CN 109659703 A CN109659703 A CN 109659703A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
Abstract
The invention discloses a kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure, belong to electromagnetic wave absorption technical field.The Meta Materials are composed of the different foamed material in shape, aperture and the metal structure of different structure size, the combination metamaterial structure utilizes that foamed material lightweight, scattering loss are big, interfacial polarization loss is strong and the advantages such as Low ESR well, and it gives full play to metal metamaterial structure and inhales the flexible controllable feature of wave frequency section, the Meta Materials are made to be reduced to -10dB or less in the maximum flat reflective rate of 1~18GHz full frequency band, key frequency band flat reflective rate is reduced to -15dB hereinafter, surface density is less than 8kg/m2, there are good wideband electromagnetic wave absorbent properties.The Meta Materials are able to achieve broadband radar invisible, and it is relatively narrow to can solve absorbing material frequency band existing in the prior art, the problem that thickness is big, surface density is high, realize efficient electric electro-magnetic wave absorption.
Description
Technical field
The present invention relates to electromagnetic wave absorption technical fields, and in particular to one kind is based on foam medium sill and metal structure
The broadband electro-magnetic wave absorption Meta Materials of fusion.
Background technique
Wireless electronic communication techniques use in recent years is more and more frequent, and electromagnetic interference and pollution problem highlight, and influences daily
Life；It also proposed new requirement to Stealth Fighter with the promotion of the radar exploration technique in Military Application field, therefore solve
The performance of the electromagnetic wave absorbent material of certainly stealthy problem is also required to improve.
Traditional stealth material generally uses the dielectrics homogeneous material such as carbon, silicon carbide, and iron sial, ferrite etc. are magnetic uniformly
Material faces narrower bandwidth, inhales that wave efficiency is low, the problems such as density is big as inhaling wave matrix, thus researcher start by
Gradually widen design of material dimension, development structure material, light structures foamed material in recent years, due to volume density is small, with it is wide, inhale
Wave mechanism is abundant to be concerned by people, but under certain thickness limitation, low-frequency range absorbing property is bad.
And metal structure Meta Materials, since design dimension is flexible, preparation process is simple, the suction of different frequency range easy to accomplish
Wave has broad application prospects in terms of electromagnetic wave regulation.
The present invention inhales wave frequency section flexibly adjustable advantage, solution using medium base foamed material lightweight, broadband and metal structure
The problem that certainly broad band low frequency section electro-magnetic wave absorption effect is poor, thickness is big, density is high.
Summary of the invention
It is an object of that present invention to provide a kind of broadband electromagnetic waves merged based on foam medium sill with metal structure
Meta Materials are absorbed, to solve the difficulty that existing absorbing material broad band low frequency section electro-magnetic wave absorption effect is poor, thickness is big, density is high
Topic.
To achieve the above object, the technical scheme is that
A kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure, the broadband
Electro-magnetic wave absorption Meta Materials are formed by connecting by foam medium base wave-absorbing material and metal structural composite multi-shell curing,
In: from top to bottom first layer is metal structural composite, and the second layer is foam medium base wave-absorbing material, and third layer is FR4 Jie
Matter substrate.
The metal structural composite is to be evenly spaced on FR4 medium substrate to be formed by multiple square metal rings；Institute
State the FR4 medium substrate in metal structural composite with a thickness of 0.4-3mm, dielectric constant 4.0-4.3.
The foam medium base wave-absorbing material be one of sic foam, carbon foam or iron-based suction wave foamed material or
Two kinds of person combinations；The mesh aperture of the foam medium base wave-absorbing material is 0.5~5.5mm, and sic foam resistivity is
100-1015Ω m, the conductivity of carbon foam are 0.2~5s/m, and the flaky powder partial size of iron-based foam is 10-80 μm.
The FR4 medium substrate of third layer with a thickness of 0.5-1mm.
The electro-magnetic wave absorption Meta Materials have preferable broadband radar absorption performance in different polarization directions, inhale the super material of wave
Material is less than -10dB in 1-18GHz frequency range flat reflective rate, and key frequency band flat reflective rate is less than -15dB, and surface density is lower than 8kg/
m2。
The preparation side of the broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure
Method includes the following steps:
(1) shape and the spacing control of foam medium sill:
Foam medium sill is processed as rectangular bulk shape, periodic arrangement, and rectangular block foamed material side length is 4mm-
65mm, the spacing of adjacent foam block materials are 1mm-20mm；
(2) the connecting material preparation of foam block material:
High molecular material, curing agent are uniformly mixed under agitation with hollow glass micropearl, obtain joint filling bridging agent,
Connecting material i.e. between foam block；The weight of high molecular material, curing agent and hollow glass micropearl in the joint filling bridging agent
Amount percentage composition is followed successively by 95~9%, 5~1% and 5~91%；Part joint filling bridging agent sample is taken, under the conditions of 50-90 DEG C
After solidification 0.5-4 hours, electromagnetic parameter testing is carried out, keeps relative dielectric constant less than 4, other uncured joint filling bridging agents
It is stored at room temperature stand-by；
(3) molded curing forms:
The polyimides wave transparent film of the commercialized 2-5 μ m-thick of each foam block material is wrapped up, is then pressed
According to the arrangement mode polymeric bonding material in step (1) on FR4 medium substrate, joint filling bridging agent is filled in each foam
Between block materials, then connects FR4 substrate and be put into togerther in mold；Baking oven is placed the mould into, is pressed in 50 DEG C -100 DEG C, 7-9MPa
Solidify 0.5-6 hours under the conditions of power；
(5) control of metal structural composite:
Metal structural composite is formed above FR4 medium substrate by multiple square metal ring covers, adjacent prismatic gold
The spacing for belonging to interannular is 3-120mm；
(6) connection of foam medium sill and metal structural composite:
Structural metallic materials is bonded in above foam medium sill using high molecular material of the thickness less than 0.2mm,
Apply 7-9MPa, and 50 DEG C -90 DEG C of solidifications 0.5-4 hours.
In above-mentioned steps (2), the curing agent is p-methyl benzenesulfonic acid, the de- product in five Lip rivers, oxalic acid or citric acid；The hollow glass
The partial size of glass microballon is 1-50 μm.
In above-mentioned steps (2), step (3) and step (6), the high molecular material is phenolic resin or epoxy resin.
In above-mentioned steps (4), in mold, joint filling bridging agent, foam block are also filled between foam block material and mold
The half with a thickness of spacing between foam block material for the joint filling bridging agent filled between body material and mold.
In above-mentioned steps (5), the square metal ring thickness is 25-45 μm, a length of 5mm- in the outside of square metal ring
80mm, the inner edge side length of square metal ring are 4mm-79mm.
The thought that the present invention designs is: choosing structural foam as wave basic material is inhaled, makes full use of the micro- knot of foam
A variety of excellent electromagnetic properties such as scattering caused by structure material, diffraction, interfacial polarization and Low ESR；Every group of foam block material
Periodic arrangement constructs the extrinsic electromagnetic performance of array distribution material, and it is flexibly controllable to inhale wave frequency section using metal metamaterial structure
The characteristics of, it plays foam medium sill and metallized metal structure obtains synergistic effect, realize wide-band electro-magnetic wave absorption.
The beneficial effects of the present invention are:
When vertical incidence, different polarization directions have preferable broadband radar absorption performance, and the absorbing meta-material reaches
It is that 1-18GHz frequency range flat reflective rate is less than -10dB to performance, key frequency band reflectivity is less than -15dB；Structure is simple, prepares
It is easy and is easy to modularization assembling, is conducive to engineering application；Using foamed material as Meta Materials design basis, surface density is low
In 8kg/m2, real wide band absorption；According to this design other frequency ranges can be used for analogy.
Detailed description of the invention
Fig. 1 is the broadband electro-magnetic wave absorption metamaterial structure signal merged based on foam medium sill with metal structure
Figure；Wherein: (a) perspective view；(b) top view；(c) bottom view；(d) sectional view.
Fig. 2 is the broadband electro-magnetic wave absorption merged based on foam medium sill with metal structure prepared by embodiment 4
Metamaterial flat reflectivity.
Specific embodiment
The present invention is to be designed processing to the foam of different pore size, period arrangement utilizes low dielectric using foam substrate
The gap filler of constant connects, and plays metal metamaterial structure and inhales the flexible controllable characteristic of wave frequency section, realizes that wide-band electromagnetic wave is inhaled
It receives.Finally prepare foam-based broadband absorbing material.
The present invention is described in detail below by various specific embodiments.
Embodiment 1
Selection base-material is carbon foam.The cystosepiment of mesh aperture 1mm, conductivity 0.7s/m-1s/m, 200 × 200mm, plate
Thick 20mm is processed into the rectangular foamed material of 20 × 20 × 10mm；By 2 μm of thickness of polyimide film packet of rectangular foamed material
It wraps up in, foam block is sticked on the FR4 medium bottom plate of 0.5mm thickness with epoxy resin, foam block spacing is 2mm, is put into mold.It will weigh
Amount fills out mixture than the phenolic resin, p-methyl benzenesulfonic acid and the mixing of 10-50 μm of partial size of hollow glass micropearl that are 88:2:10
It fills between foam in gap, mixture and above-mentioned foam combination complete that hot pressing is compound, and compound condition is temperature control 90 in a mold
DEG C, apply pressure 9MPa, keep 3 hours.Square metal ring cover is above FR4 medium substrate, square metal ring structure thickness
At 30 μm, a length of 40mm in the outside of square metal ring, the inner edge side length of becket is 38mm, and the spacing of metal Q-RING is
50mm, FR4 with a thickness of 0.4mm, dielectric constant 4.2.Structural metallic materials is glued using with a thickness of the epoxy resin of 0.1mm
It connects above foamed material, applies 7-9MPa, 60 DEG C solidify 3 hours.Prepared sample structure such as Fig. 1.
Flat reflective rate, the present embodiment foam are tested using waving map method on Agilent-N5230A Network Analyzer
Composite material is combined in 1~18GHz frequency range, maximum flat reflective rate is reduced to -10dB hereinafter, 2-4GHz frequency range reflectivity is small
In -15dB, surface density is lower than 7.6kg/m2, there is excellent broadband radar-wave absorbing performance.
Embodiment 2
Selection base-material is sic foam.Choose mesh aperture 4mm, resistivity 103-1010Ω m, 200 × 200mm
Cystosepiment, plate thickness 20mm；It is processed into the rectangular foamed material of 50 × 50 × 15mm；By 3 μm of thickness of polyamides of rectangular foamed material
Foam block, is sticked on the FR4 medium bottom plate of 0.5mm thickness by imines film package with epoxy resin, and foam block spacing is 3mm, is put into
Mold.Phenolic resin, p-methyl benzenesulfonic acid and 10-40 μm of partial size of hollow glass micropearl that weight ratio is 88:2:10 are mixed, it will
Mixture is filled between foam in gap, and it is compound that mixture and above-mentioned foam combination complete hot pressing in a mold, compound condition
For 90 DEG C of temperature control, apply pressure 9MPa, is kept for 3 hours.Square metal ring cover is above FR4 medium substrate, square metal ring
For structural thickness at 38 μm, a length of 36mm in the outside of square metal ring, the inner edge side length of becket is 34mm, between metal Q-RING
Away from for 40mm, FR4 with a thickness of 0.5mm, dielectric constant 4.1.Using the epoxy resin with a thickness of 0.2mm by metal structure material
Material is bonded in above foamed material, applies 7-9MPa, and 60 DEG C solidify 3 hours.
Flat reflective rate, the present embodiment foam are tested using waving map method on Agilent-N5230A Network Analyzer
Composite material is combined in 1~18GHz frequency range, maximum flat reflective rate is reduced to -10dB hereinafter, 1-1.5GHz frequency range reflectivity
Less than -15dB, surface density is lower than 7.6kg/m2, there is excellent broadband radar-wave absorbing performance.
Embodiment 3
Selection base-material is iron sial foam.Choose the foam of mesh aperture 2mm, 80 μm of iron sial partial size, 200 × 200mm
Plate, plate thickness 20mm are processed into the rectangular foamed material of 30 × 30 × 15mm；By 3 μm of thickness of polyimides of rectangular foamed material
Foam block, is sticked on the FR4 medium bottom plate of 1mm thickness by film package with epoxy resin, and foam block spacing is 5mm, is put into mold.It will
Phenolic resin, p-methyl benzenesulfonic acid and the mixing of 15-40 μm of partial size of hollow glass micropearl that weight ratio is 88:2:10, by mixture
It is filled between foam in gap, mixture completes that hot pressing is compound, and compound condition is temperature control with above-mentioned foam combination in a mold
80 DEG C, application pressure 9MPa, are kept for 3 hours.For square metal ring cover above FR4 medium substrate, square metal ring structure is thick
Degree is at 25 μm, a length of 10mm in the outside of square metal ring, and the inner edge side length of becket is 8mm, and the spacing of metal Q-RING is
25mm, FR4 with a thickness of 0.6mm, dielectric constant 4.3.Using the epoxy resin with a thickness of 0.15mm by structural metallic materials
It is bonded in above foamed material, applies 7-9MPa, 60 DEG C solidify 3 hours.
Flat reflective rate, the present embodiment foam are tested using waving map method on Agilent-N5230A Network Analyzer
Composite material is combined in 1~18GHz frequency range, maximum flat reflective rate is reduced to -10dB hereinafter, 8-12GHz frequency range reflectivity
Less than -15dB, surface density is lower than 7.8kg/m2, there is excellent broadband radar-wave absorbing performance.
Embodiment 4
Choosing base-material is sic foam and carbon foam.Sic foam chooses mesh aperture 2mm, resistivity 104-1011
The cystosepiment of Ω m, 200 × 200mm, plate thickness 20mm are processed into the rectangular foamed material of 40 × 40 × 15mm；Carbon foam mesh hole
The cystosepiment of diameter 2mm, conductivity 1s/m-1.5s/m, 200 × 200mm, plate thickness 20mm are processed into the rectangular bubble of 20 × 20 × 15mm
Foam material；3 μm of thickness of polyimide film of rectangular foamed material is wrapped up, foam block is sticked to 0.8mm thickness with epoxy resin
FR4 medium bottom plate on, foam block spacing be 4mm, be put into mold.Phenolic resin, the p-methyl benzenesulfonic acid for being 89:5:6 by weight
It mixes, mixture is filled between foam in gap, mixture and above-mentioned foam group with 15-50 μm of partial size of hollow glass micropearl
The fit hot pressing of completion in a mold is compound, and compound condition is 90 DEG C of temperature control, applies pressure 9MPa, is kept for 3 hours.Square metal ring
It is covered on above FR4 medium substrate, square metal ring structure thickness is at 38 μm, a length of 40mm in the outside of square metal ring, metal
The inner edge side length of ring is 39mm, and the spacing of metal Q-RING is 30mm, FR4 with a thickness of 0.5mm, dielectric constant 4.0.It uses
Structural metallic materials is bonded in above foamed material with a thickness of the epoxy resin of 0.2mm, applies 7-9MPa, 60 DEG C of solidifications 3 are small
When.
Flat reflective rate, the present embodiment foam are tested using waving map method on Agilent-N5230A Network Analyzer
Composite material is combined in 1~18GHz frequency range, maximum flat reflective rate is reduced to -10dB hereinafter, 12-18GHz frequency range reflectivity
Less than -15dB (Fig. 2), surface density is lower than 7.4kg/m2, there is excellent broadband radar-wave absorbing performance.
Embodiment 5
Choosing base-material is iron sial foam and carbon foam.Choose mesh aperture 2mm, 60 μm of iron sial partial size, 200 ×
The cystosepiment of 200mm, plate thickness 20mm are processed into the rectangular foam of 40 × 40 × 15mm；Carbon foam mesh aperture 2mm, conductivity
The cystosepiment of 0.5s/m-1.5s/m, 200 × 200mm, plate thickness 20mm are processed into the rectangular foamed material of 20 × 20 × 15mm；It will be square
Shape foamed material is wrapped up with 3 μm of thickness of polyimide film, and foam block is sticked to the FR4 medium bottom of 0.5mm thickness with epoxy resin
On plate, foam block spacing is 3mm, is put into mold.Phenolic resin, p-methyl benzenesulfonic acid and the partial size 15- for being 89:5:6 by weight ratio
50 μm of hollow glass micropearl mixing, mixture is filled between foam in gap, mixture and above-mentioned foam combination are in mould
It is compound that hot pressing is completed in tool, compound condition is 90 DEG C of temperature control, applies pressure 9MPa, is kept for 3 hours.Square metal ring cover exists
Above FR4 medium substrate, square metal ring structure thickness at 38 μm, a length of 30mm in the outside of square metal ring, becket it is interior
Side side length is 29mm, and the spacing of metal Q-RING is 30mm, FR4 with a thickness of 0.5mm, dielectric constant 4.3.Using with a thickness of
Structural metallic materials is bonded in above foamed material by the epoxy resin of 0.2mm, applies 7-9MPa, and 60 DEG C solidify 3 hours.
Flat reflective rate, the present embodiment foam are tested using waving map method on Agilent-N5230A Network Analyzer
Composite material is combined in 1~18GHz frequency range, maximum flat reflective rate is reduced to -10dB hereinafter, 8-12GHz frequency range reflectivity
Less than -15dB, surface density is lower than 7.9kg/m2, there is excellent broadband radar-wave absorbing performance.
Embodiment 6
Choosing base-material is sic foam and iron sial foam.Sic foam chooses mesh aperture 2mm, resistivity 102-
109The cystosepiment of Ω m, 200 × 200mm, plate thickness 20mm are processed into the rectangular foamed material of 30 × 30 × 16mm；Choose iron silicon
Aluminum foam mesh aperture 1mm, 50 μm of iron sial partial size, 200 × 200mm cystosepiment, plate thickness 20mm, be processed into 30 × 30 ×
The rectangular foam of 16mm；3 μm of thickness of polyimide film of rectangular foamed material is wrapped up, is sticked to foam block with epoxy resin
On the FR4 medium bottom plate of 0.5mm thickness, foam block spacing is 3mm, is put into mold.The phenolic resin, right for being 90:5:5 by weight ratio
Mixture is filled between foam in gap by the hollow glass micropearl mixing of toluenesulfonic acid and 30-50 μm of partial size, mixture with it is upper
Stating foam combination, to complete hot pressing in a mold compound, and compound condition is 90 DEG C of temperature control, applies pressure 9MPa, is kept for 3 hours.Side
Shape becket is covered on above FR4 medium substrate, and for square metal ring structure thickness at 38 μm, the outside of square metal ring is a length of
36mm, the inner edge side length of becket are 34mm, and the spacing of metal Q-RING is 33mm, FR4 with a thickness of 0.5mm, dielectric constant
It is 4.2.Structural metallic materials is bonded in above foamed material using the epoxy resin with a thickness of 0.2mm, applies 7-9MPa, 60
DEG C solidification 3 hours.
Flat reflective rate, the present embodiment foam are tested using waving map method on Agilent-N5230A Network Analyzer
Composite material is combined in 1~18GHz frequency range, maximum flat reflective rate is reduced to -10dB hereinafter, 1.5-2GHz frequency range reflectivity
Less than -15dB, surface density is lower than 7.6kg/m2, there is excellent broadband radar-wave absorbing performance.
Claims (10)
1. a kind of broadband electro-magnetic wave absorption Meta Materials merged based on foam medium sill with metal structure, feature are existed
In: the broadband electro-magnetic wave absorption Meta Materials are connected by foam medium base wave-absorbing material and metal structural composite multi-shell curing
It connects, in which: from top to bottom first layer is metal structural composite, and the second layer is foam medium base wave-absorbing material, third
Layer is FR4 medium substrate.
2. the broadband electro-magnetic wave absorption according to claim 1 merged based on foam medium sill with metal structure is super
Material, it is characterised in that: the metal structural composite is evenly spaced on FR4 medium substrate by multiple square metal rings
It is formed；FR4 medium substrate in the metal structural composite with a thickness of 0.4-3mm, dielectric constant 4.0-4.3.
3. the broadband electro-magnetic wave absorption according to claim 1 merged based on foam medium sill with metal structure is super
Material, it is characterised in that: the foam medium base wave-absorbing material is in sic foam, carbon foam or iron-based suction wave foamed material
One or two kinds of combination；The mesh aperture of the foam medium base wave-absorbing material is 0.5~5.5mm, sic foam electricity
Resistance rate is 100-1015Ω m, the conductivity of carbon foam are 0.2~5s/m, and the flaky powder partial size of iron-based foam is 10-80 μm.
4. the broadband electro-magnetic wave absorption according to claim 1 merged based on foam medium sill with metal structure is super
Material, it is characterised in that: the FR4 medium substrate of third layer with a thickness of 0.5-1mm.
5. the broadband electro-magnetic wave absorption according to claim 2 merged based on foam medium sill with metal structure is super
Material, it is characterised in that: the electro-magnetic wave absorption Meta Materials have preferable broadband radar absorption performance in different polarization directions,
Absorbing meta-material is less than -10dB in 1-18GHz frequency range flat reflective rate, and key frequency band flat reflective rate is less than -15dB, surface density
Lower than 8kg/m2。
6. the broadband electro-magnetic wave absorption according to claim 2 merged based on foam medium sill with metal structure is super
The preparation method of material, it is characterised in that: this method comprises the following steps:
(1) shape and the spacing control of foam medium sill:
Foam medium sill is processed as rectangular bulk shape, periodic arrangement, and rectangular block foamed material side length is 4mm-65mm,
The spacing of adjacent foam block materials is 1mm-20mm；
(2) the connecting material preparation of foam block material:
High molecular material, curing agent are uniformly mixed under agitation with hollow glass micropearl, joint filling bridging agent is obtained, that is, steeps
Connecting material between foam block；The weight hundred of high molecular material, curing agent and hollow glass micropearl in the joint filling bridging agent
Point content is followed successively by 95~9%, 5~1% and 5~91%；Part joint filling bridging agent sample is taken, is solidified under the conditions of 50-90 DEG C
After 0.5-4 hours, electromagnetic parameter testing is carried out, keeps relative dielectric constant less than 4, other uncured joint filling bridging agent room temperature
It saves stand-by；
(3) molded curing forms:
The polyimides wave transparent film of the commercialized 2-5 μ m-thick of each foam block material is wrapped up, then according to step
Suddenly joint filling bridging agent is filled in each foam block on FR4 medium substrate by the arrangement mode polymeric bonding material in (1)
Between material, then connects FR4 substrate and be put into togerther in mold；Baking oven is placed the mould into, in 50 DEG C -100 DEG C, 7-9MPa pressure strip
Solidify 0.5-6 hours under part；
(5) control of metal structural composite:
Metal structural composite is formed above FR4 medium substrate by multiple square metal ring covers, adjacent prismatic becket
Between spacing be 3-120mm；
(6) connection of foam medium sill and metal structural composite:
Structural metallic materials is bonded in above foam medium sill using high molecular material of the thickness less than 0.2mm, is applied
7-9MPa, and 50 DEG C -90 DEG C of solidifications 0.5-4 hours.
7. the broadband electro-magnetic wave absorption according to claim 6 merged based on foam medium sill with metal structure is super
The preparation method of material, it is characterised in that: in step (2), the curing agent is p-methyl benzenesulfonic acid, the de- product in five Lip rivers, oxalic acid or lemon
Lemon acid；The partial size of the hollow glass micropearl is 1-50 μm.
8. the broadband electro-magnetic wave absorption according to claim 6 merged based on foam medium sill with metal structure is super
The preparation method of material, it is characterised in that: in step (2), step (3) and step (6), the high molecular material is phenolic resin
Or epoxy resin.
9. the broadband electro-magnetic wave absorption according to claim 6 merged based on foam medium sill with metal structure is super
The preparation method of material, it is characterised in that: in step (4), in mold, also fill joint filling between foam block material and mold
Bridging agent, the joint filling bridging agent filled between foam block material and mold with a thickness of one of spacing between foam block material
Half.
10. the broadband electro-magnetic wave absorption according to claim 6 merged based on foam medium sill with metal structure
The preparation method of Meta Materials, it is characterised in that: in step (5), the square metal ring thickness is 25-45 μm, square metal ring
The a length of 5mm-80mm in outside, the inner edge side length of square metal ring is 4mm-79mm.
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| CN110600885A (en) * | 2019-09-04 | 2019-12-20 | 北京理工大学 | Frequency selective surface with absorption-reflection-absorption characteristics |
| CN111585034A (en) * | 2020-06-02 | 2020-08-25 | 中国人民解放军军事科学院国防科技创新研究院 | Design method of impedance matching type metamaterial |
| CN113140913A (en) * | 2021-04-16 | 2021-07-20 | 湖南工商大学 | P-waveband three-dimensional broadband composite wave-absorbing metamaterial and preparation method thereof |
| CN113285234A (en) * | 2021-05-21 | 2021-08-20 | 中国人民解放军军事科学院国防科技创新研究院 | 8-14 GHz-waveband efficient wave-absorbing superstructure surface material |
| CN115674819A (en) * | 2023-01-03 | 2023-02-03 | 湖南博翔新材料有限公司 | Broadband wave-absorbing material and preparation method thereof |
| US11799185B1 (en) | 2022-04-14 | 2023-10-24 | Ford Global Technologies, Llc | Multi-purpose use of metal foam in a vehicle |
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| CN113140913B (en) * | 2021-04-16 | 2022-07-01 | 湖南工商大学 | P-waveband three-dimensional broadband composite wave-absorbing metamaterial and preparation method thereof |
| CN113285234A (en) * | 2021-05-21 | 2021-08-20 | 中国人民解放军军事科学院国防科技创新研究院 | 8-14 GHz-waveband efficient wave-absorbing superstructure surface material |
| CN113285234B (en) * | 2021-05-21 | 2022-06-17 | 中国人民解放军军事科学院国防科技创新研究院 | 8 ~ 14GHz wave band high efficiency wave-absorbing superstructure surface material |
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