CN109659703B - Broadband electromagnetic wave absorption metamaterial based on fusion of foam dielectric base material and metal structure - Google Patents
Broadband electromagnetic wave absorption metamaterial based on fusion of foam dielectric base material and metal structure Download PDFInfo
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- CN109659703B CN109659703B CN201811423226.7A CN201811423226A CN109659703B CN 109659703 B CN109659703 B CN 109659703B CN 201811423226 A CN201811423226 A CN 201811423226A CN 109659703 B CN109659703 B CN 109659703B
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- 239000000758 substrate Substances 0.000 claims description 21
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- JOXIMZWYDAKGHI-UHFFFAOYSA-N p-toluenesulfonic acid Substances CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 14
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
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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
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Disclosure of the inventionA broadband electromagnetic wave absorption metamaterial based on fusion of a foam dielectric base material and a metal structure belongs to the technical field of electromagnetic wave absorption. The metamaterial is formed by combining foam materials with different shapes and apertures and metal structures with different structural sizes, the combined metamaterial structure well utilizes the advantages of light weight, large scattering loss, strong interface polarization loss, low impedance and the like of the foam materials, and fully exerts the characteristic that the wave-absorbing frequency band of the metal metamaterial structure is flexible and controllable, so that the maximum flat plate reflectivity of the metamaterial in the full frequency band of 1-18GHz is reduced to be below-10 dB, the flat plate reflectivity of the key frequency band is reduced to be below-15 dB, and the surface density is less than 8kg/m2And has good broadband electromagnetic wave absorption performance. The metamaterial can realize broadband radar stealth, can solve the problems of narrow frequency band, large thickness and high surface density of wave-absorbing materials in the prior art, and realizes efficient electromagnetic wave absorption.
Description
Technical Field
The invention relates to the technical field of electromagnetic wave absorption, in particular to a broadband electromagnetic wave absorption metamaterial based on fusion of a foam dielectric base material and a metal structure.
Background
In recent years, wireless electronic communication technology is used more and more frequently, electromagnetic interference and pollution problems are obvious, and daily life is influenced; in the field of military application, with the improvement of radar detection technology, new requirements on stealth performance are also put forward, so that the performance of an electromagnetic wave absorbing material for solving the stealth problem needs to be improved.
The traditional stealth material generally adopts dielectric uniform materials such as carbon and silicon carbide and magnetic uniform materials such as iron-silicon-aluminum and ferrite as wave-absorbing matrixes, but the problems of narrow bandwidth, low wave-absorbing efficiency, high density and the like are faced, so researchers begin to gradually widen the design dimension of the material and develop structural materials.
The metamaterial with the metal structure has flexible design dimension and simple preparation process, is easy to realize wave absorption of different frequency bands, and has wide application prospect in the aspect of electromagnetic wave regulation.
The invention utilizes the advantages of light weight of the medium-based foam material and flexible and adjustable wave-absorbing frequency bands of the broadband and metal structure to solve the problems of poor electromagnetic wave absorption effect, large thickness and high density of the broadband low-frequency band.
Disclosure of Invention
The invention aims to provide a broadband electromagnetic wave absorption metamaterial based on fusion of a foam dielectric base material and a metal structure, and aims to solve the problems of poor broadband low-frequency-band electromagnetic wave absorption effect, large thickness and high density of the existing wave absorption material.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a broadband electromagnetic wave absorption metamaterial based on fusion of a foam dielectric base material and a metal structure is formed by layering, solidifying and connecting a foam dielectric base wave absorption material and a metal structure composite material, wherein: the first layer is a metal structure composite material, the second layer is a foam medium-based wave-absorbing material, and the third layer is an FR4 medium substrate.
The metal structure composite material is formed by uniformly arranging a plurality of square metal rings on an FR4 medium substrate; the FR4 medium substrate in the metal structure composite material has the thickness of 0.4-3mm and the dielectric constant of 4.0-4.3.
The foam medium-based wave-absorbing material is one or two of silicon carbide foam, carbon foam or iron-based wave-absorbing foam material; the aperture of the meshes of the foam medium-based wave-absorbing material is 0.5-5.5 mm, and the resistivity of the silicon carbide foam is 100-1015Omega.m, the conductivity of the carbon foam is 0.2-5 s/m, and the particle size of the flaky powder of the iron-based foam is 10-80 mu m.
The thickness of FR4 medium substrate of the third layer is 0.5-1 mm.
The electromagnetic wave absorption metamaterial has good broadband radar absorption performance in different polarization directions, the flat plate reflectivity of the wave absorption metamaterial in a frequency band of 1-18GHz is less than-10 dB, the flat plate reflectivity of a key frequency band is less than-15 dB, and the surface density is lower than 8kg/m2。
The preparation method of the broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric base material and the metal structure comprises the following steps:
(1) controlling the shape and the spacing of the foam medium base material:
the foam medium base material is processed into a square block shape and is periodically arranged, the side length of the square block foam material is 4mm-65mm, and the distance between adjacent foam block materials is 1mm-20 mm;
(2) preparing a connecting material of the foam block material:
uniformly mixing a high polymer material, a curing agent and hollow glass beads under a stirring condition to obtain a joint filling connecting agent, namely a connecting material between foam blocks; the weight percentage of the macromolecular material, the curing agent and the hollow glass bead in the joint filling connecting agent is 95-9%, 5-1% and 5-91% in sequence; taking a part of gap filling connector sample, curing for 0.5-4 hours at 50-90 ℃, then carrying out electromagnetic parameter test, keeping the relative dielectric constant less than 4, and storing other uncured gap filling connectors at normal temperature for later use;
(3) and (3) mould pressing, curing and forming:
wrapping the foam block materials by using a commercial polyimide wave-transmitting film with the thickness of 2-5 mu m, then adhering high polymer materials on the FR4 medium substrate according to the arrangement mode in the step (1), filling gap filling connectors among the foam block materials, and then putting the foam block materials and the FR4 substrate into a mould; putting the mould into a drying oven, and curing for 0.5-6 hours at the temperature of 50-100 ℃ and under the pressure of 7-9 MPa;
(5) control of the metal structure composite material:
the metal structure composite material is formed by covering a plurality of square metal rings above an FR4 medium substrate, and the distance between every two adjacent square metal rings is 3-120 mm;
(6) connecting the foam medium base material with the metal structure composite material:
using high molecular material whose thickness is less than 0.2mm to adhere the metal structure material on the foamed medium base material, applying 7-9MPa, and curing at 50-90 deg.C for 0.5-4 hr.
In the step (2), the curing agent is p-toluenesulfonic acid, pentosan, oxalic acid or citric acid; the particle size of the hollow glass bead is 1-50 μm.
In the step (2), the step (3) and the step (6), the polymer material is phenolic resin or epoxy resin.
In the step (4), in the mold, the gap filling connector is also filled between the foam block material and the mold, and the thickness of the gap filling connector filled between the foam block material and the mold is half of the distance between the foam block materials.
In the step (5), the thickness of the square metal ring is 25-45 μm, the outer side length of the square metal ring is 5-80 mm, and the inner side length of the square metal ring is 4-79 mm.
The idea of the design of the invention is as follows: selecting a foam structure material as a wave-absorbing basic material, and fully utilizing various excellent electromagnetic properties such as scattering, diffraction, interface polarization, low impedance and the like caused by the foam structure material; each group of foam block materials are periodically arranged to construct the extrinsic electromagnetic performance of the array distribution material, and the synergistic effect of the foam medium base material and the metal structure is exerted by utilizing the characteristic that the wave-absorbing frequency band of the metal metamaterial structure is flexible and controllable, so that the wide-frequency-band electromagnetic wave absorption is realized.
The invention has the beneficial effects that:
when the wave-absorbing metamaterial is vertically incident, the wave-absorbing metamaterial has good broadband radar absorption performance in different polarization directions, the wave-absorbing metamaterial achieves the performance that the reflectivity of a flat plate in a frequency range of 1-18GHz is less than-10 dB, and the reflectivity of a key frequency range is less than-15 dB; the structure is simple, the preparation is easy, the modularized assembly is easy, and the engineering application is facilitated; the foam material is used as a metamaterial design base, and the areal density is lower than 8kg/m2Real broadband absorption; analogy to other frequency bands is possible according to this design.
Drawings
FIG. 1 is a structural schematic diagram of a broadband electromagnetic wave absorption metamaterial based on fusion of a foam dielectric base material and a metal structure; wherein: (a) a perspective view; (b) a top view; (c) a bottom view; (d) a cross-sectional view.
Fig. 2 shows the reflectivity of a flat plate of the broadband electromagnetic wave absorption metamaterial prepared in example 4 based on the fusion of the foam dielectric base material and the metal structure.
Detailed Description
According to the invention, foam base materials are utilized to design and process foams with different apertures, the foams are periodically arranged, and joint fillers with low dielectric constants are utilized for connection, so that the characteristic that the wave-absorbing frequency band of the metal metamaterial structure is flexible and controllable is exerted, and the broadband electromagnetic wave absorption is realized. Finally preparing the foam-based broadband wave-absorbing material.
The invention is described in detail below by means of various specific embodiments.
Example 1
The base material is selected to be carbon foam. A foam board with mesh aperture of 1mm, conductivity of 0.7s/m-1s/m and thickness of 200 x 200mm, the board thickness is 20mm, and the foam board is processed into a square foam material with thickness of 20 x 10 mm; the square foam material was wrapped with a polyimide film having a thickness of 2 μm, and blocks of foam were attached to a 0.5mm thick FR4 dielectric backing plate with an epoxy resin at a block spacing of 2mm and placed in a mold. Mixing the following components in percentage by weight 88: 2: 10, mixing the phenolic resin, the p-toluenesulfonic acid and the hollow glass beads with the particle size of 10-50 mu m, filling the mixture into gaps among foams, and finishing hot-pressing compounding of the mixture and the foam assembly in a mold under the compounding condition of controlling the temperature to be 90 ℃ and applying the pressure to be 9MPa and keeping for 3 hours. The square metal ring covers the FR4 medium substrate, the thickness of the square metal ring structure is 30 μm, the length of the outer edge of the square metal ring is 40mm, the length of the inner edge of the metal ring is 38mm, the distance between the metal square rings is 50mm, the thickness of FR4 is 0.4mm, and the dielectric constant is 4.2. The metal structure material was bonded over the foam using an epoxy resin with a thickness of 0.1mm, applied at 7-9MPa and cured at 60 ℃ for 3 hours. The prepared sample structure is shown in figure 1.
The reflectivity of the flat plate is tested on an Agilent-N5230A network analyzer by adopting a time domain testing method, the maximum reflectivity of the flat plate of the foam assembly composite material is reduced to be below-10 dB in a frequency band of 1-18GHz, the reflectivity of the 2-4GHz frequency band is less than-15 dB, and the surface density is lower than 7.6kg/m2And has excellent wave absorbing performance of the broadband radar.
Example 2
Selecting base materialsIs a silicon carbide foam. The aperture of the selected mesh is 4mm, and the resistivity is 103-1010A foam board of 200 × 200mm in thickness of 20 mm; processing into square foam material of 50 × 50 × 15 mm; the square foam material was wrapped with a polyimide film of 3 μm thickness, and the foam blocks were attached to a 0.5mm thick FR4 dielectric backing plate with an epoxy resin at a foam block spacing of 3mm and placed in a mold. Mixing the following components in percentage by weight 88: 2: 10, mixing the phenolic resin, the p-toluenesulfonic acid and the hollow glass beads with the particle size of 10-40 mu m, filling the mixture into gaps among foams, and finishing hot-pressing compounding of the mixture and the foam assembly in a mold under the compounding condition of controlling the temperature to be 90 ℃ and applying the pressure to be 9MPa and keeping for 3 hours. The square metal ring covers the FR4 medium substrate, the thickness of the square metal ring structure is 38 μm, the outer side length of the square metal ring is 36mm, the inner side length of the metal ring is 34mm, the distance between the metal square rings is 40mm, the thickness of FR4 is 0.5mm, and the dielectric constant is 4.1. The metal structure material was bonded over the foam using an epoxy resin with a thickness of 0.2mm, applied at 7-9MPa and cured at 60 ℃ for 3 hours.
The reflectivity of the flat plate is tested on an Agilent-N5230A network analyzer by adopting a time domain testing method, the maximum reflectivity of the flat plate of the foam assembly composite material is reduced to be below-10 dB at a frequency band of 1-18GHz, the reflectivity of the frequency band of 1-1.5GHz is less than-15 dB, and the surface density is lower than 7.6kg/m2And has excellent wave absorbing performance of the broadband radar.
Example 3
The base material is selected to be iron-silicon-aluminum foam. Selecting a foam board with the mesh aperture of 2mm, the particle size of the Fe-Si-Al alloy of 80 mu m and the thickness of 200 multiplied by 200mm, and processing the foam board into a square foam material with the thickness of 30 multiplied by 15 mm; the square foam material was wrapped with a polyimide film having a thickness of 3 μm, and foam blocks were attached to a FR4 dielectric substrate having a thickness of 1mm with an epoxy resin, with a foam block spacing of 5mm, and placed in a mold. Mixing the following components in percentage by weight 88: 2: 10, mixing the phenolic resin, the p-toluenesulfonic acid and the hollow glass beads with the particle size of 15-40 mu m, filling the mixture into gaps among foams, and finishing hot-pressing compounding of the mixture and the foam assembly in a mold, wherein the compounding conditions comprise temperature control of 80 ℃, pressure application of 9MPa and holding for 3 hours. The square metal ring covers the FR4 medium substrate, the thickness of the square metal ring structure is 25 μm, the outer side length of the square metal ring is 10mm, the inner side length of the metal ring is 8mm, the distance between the metal square rings is 25mm, the thickness of FR4 is 0.6mm, and the dielectric constant is 4.3. The metal construction material was bonded over the foam using an epoxy resin with a thickness of 0.15mm, applied at 7-9MPa and cured at 60 ℃ for 3 hours.
The reflectivity of the flat plate is tested on an Agilent-N5230A network analyzer by adopting a time domain testing method, the maximum reflectivity of the flat plate of the foam assembly composite material is reduced to be below-10 dB in a frequency band of 1-18GHz, the reflectivity of the foam assembly composite material in a frequency band of 8-12GHz is less than-15 dB, and the surface density is lower than 7.8kg/m2And has excellent wave absorbing performance of the broadband radar.
Example 4
The base material is selected from silicon carbide foam and carbon foam. The aperture of the selected mesh of the silicon carbide foam is 2mm, and the resistivity is 104-1011A foam board of 200 × 200mm omega · m, the board thickness is 20mm, and the foam board is processed into a square foam material of 40 × 40 × 15 mm; a foam plate with the aperture of the carbon foam mesh being 2mm, the conductivity being 1s/m-1.5s/m and 200 multiplied by 200mm, the plate thickness being 20mm, and the foam plate is processed into a square foam material with the thickness being 20 multiplied by 15 mm; the square foam material was wrapped with a polyimide film of 3 μm thickness, and the foam blocks were attached to a 0.8mm thick FR4 dielectric backing plate with an epoxy resin, with a foam block spacing of 4mm, and placed in a mold. The weight is 89: 5: 6, mixing the phenolic resin, the p-toluenesulfonic acid and the hollow glass beads with the particle size of 15-50 mu m, filling the mixture into gaps among foams, and finishing hot-pressing compounding of the mixture and the foam assembly in a mold under the compounding condition of controlling the temperature to be 90 ℃ and applying the pressure to be 9MPa and keeping for 3 hours. The square metal ring covers the FR4 medium substrate, the thickness of the square metal ring structure is 38 μm, the length of the outer edge of the square metal ring is 40mm, the length of the inner edge of the metal ring is 39mm, the distance between the metal square rings is 30mm, the thickness of FR4 is 0.5mm, and the dielectric constant is 4.0. The metal structure material was bonded over the foam using an epoxy resin with a thickness of 0.2mm, applied at 7-9MPa and cured at 60 ℃ for 3 hours.
The reflectivity of the flat plate is tested on an Agilent-N5230A network analyzer by adopting a time domain testing method, and the foam assembly composite material of the embodiment is a maximum flat plate in a frequency band of 1-18GHzThe reflectivity is reduced to below-10 dB, the reflectivity of a 12-18GHz frequency band is less than-15 dB (figure 2), and the surface density is lower than 7.4kg/m2And has excellent wave absorbing performance of the broadband radar.
Example 5
The base materials are selected from iron-silicon-aluminum foam and carbon foam. Selecting a foam plate with the mesh aperture of 2mm, the particle size of the Fe-Si-Al alloy of 60 mu m and the thickness of 200 multiplied by 200mm, and processing the foam plate into square foam with the thickness of 40 multiplied by 15mm, wherein the plate thickness is 20 mm; a foam board with the aperture of the carbon foam mesh being 2mm, the conductivity being 0.5s/m-1.5s/m and the thickness being 200 multiplied by 200mm, the board thickness being 20mm, and the square foam material being 20 multiplied by 15mm is processed; the square foam material was wrapped with a polyimide film of 3 μm thickness, and the foam blocks were attached to a 0.5mm thick FR4 dielectric backing plate with an epoxy resin at a foam block spacing of 3mm and placed in a mold. Mixing the components in a weight ratio of 89: 5: 6, mixing the phenolic resin, the p-toluenesulfonic acid and the hollow glass beads with the particle size of 15-50 mu m, filling the mixture into gaps among foams, and finishing hot-pressing compounding of the mixture and the foam assembly in a mold under the compounding condition of controlling the temperature to be 90 ℃ and applying the pressure to be 9MPa and keeping for 3 hours. The square metal ring covers the FR4 medium substrate, the thickness of the square metal ring structure is 38 μm, the outer side length of the square metal ring is 30mm, the inner side length of the metal ring is 29mm, the distance between the metal square rings is 30mm, the thickness of FR4 is 0.5mm, and the dielectric constant is 4.3. The metal structure material was bonded over the foam using an epoxy resin with a thickness of 0.2mm, applied at 7-9MPa and cured at 60 ℃ for 3 hours.
The reflectivity of the flat plate is tested on an Agilent-N5230A network analyzer by adopting a time domain testing method, the maximum reflectivity of the flat plate of the foam assembly composite material is reduced to be below-10 dB in a frequency band of 1-18GHz, the reflectivity of the foam assembly composite material in a frequency band of 8-12GHz is less than-15 dB, and the surface density is lower than 7.9kg/m2And has excellent wave absorbing performance of the broadband radar.
Example 6
The base material is selected from silicon carbide foam and ferrum-silicon-aluminum foam. The aperture of the selected mesh of the silicon carbide foam is 2mm, and the resistivity is 102-109Omega.m, 200X 200mm foam board, the board thickness is 20mm, process into square foam material of 30X 16 mm; selecting a foam with 1mm aperture of Fe-Si-Al foam mesh, 50 μm grain size of Fe-Si-Al and 200 × 200mmA foam board with the thickness of 20mm is processed into square foam with the thickness of 30 multiplied by 16 mm; the square foam material was wrapped with a polyimide film of 3 μm thickness, and the foam blocks were attached to a 0.5mm thick FR4 dielectric backing plate with an epoxy resin at a foam block spacing of 3mm and placed in a mold. Mixing the components in a weight ratio of 90: 5: 5, mixing the phenolic resin, the p-toluenesulfonic acid and the hollow glass beads with the particle size of 30-50 mu m, filling the mixture into gaps among foams, and finishing hot-pressing compounding of the mixture and the foam assembly in a mold under the compounding condition of controlling the temperature to be 90 ℃ and applying the pressure to be 9MPa and keeping for 3 hours. The square metal ring covers the FR4 medium substrate, the thickness of the square metal ring structure is 38 μm, the outer side length of the square metal ring is 36mm, the inner side length of the metal ring is 34mm, the distance between the metal square rings is 33mm, the thickness of FR4 is 0.5mm, and the dielectric constant is 4.2. The metal structure material was bonded over the foam using an epoxy resin with a thickness of 0.2mm, applied at 7-9MPa and cured at 60 ℃ for 3 hours.
The reflectivity of the flat plate is tested on an Agilent-N5230A network analyzer by adopting a time domain testing method, the maximum reflectivity of the flat plate of the foam assembly composite material is reduced to be below-10 dB at a frequency band of 1-18GHz, the reflectivity of the frequency band of 1.5-2GHz is less than-15 dB, and the surface density is lower than 7.6kg/m2And has excellent wave absorbing performance of the broadband radar.
Claims (8)
1. A broadband electromagnetic wave absorption metamaterial based on fusion of a foam dielectric base material and a metal structure is characterized in that: the broadband electromagnetic wave absorption metamaterial is formed by layering, solidifying and connecting a foam medium-based wave absorption material and a metal structure composite material, wherein: the first layer is a metal structure composite material, the second layer is a foam medium-based wave-absorbing material and the third layer is an FR4 medium substrate from top to bottom;
the metal structure composite material is formed by uniformly arranging a plurality of square metal rings on an FR4 medium substrate; the FR4 medium substrate in the metal structure composite material has the thickness of 0.4-3mm and the dielectric constant of 4.0-4.3;
the foam medium-based wave-absorbing material is one or two of silicon carbide foam, carbon foam or iron-based wave-absorbing foam material; what is needed isThe aperture of the meshes of the foam medium-based wave-absorbing material is 0.5-5.5 mm, and the resistivity of the silicon carbide foam is 100-1015Omega.m, the conductivity of the carbon foam is 0.2-5 s/m, and the particle size of the flaky powder of the iron-based foam is 10-80 mu m.
2. The broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric-based material and the metal structure as claimed in claim 1, wherein: the thickness of FR4 medium substrate of the third layer is 0.5-1 mm.
3. The broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric-based material and the metal structure as claimed in claim 1, wherein: the electromagnetic wave absorption metamaterial has good broadband radar absorption performance in different polarization directions, the flat plate reflectivity of the wave absorption metamaterial in a frequency band of 1-18GHz is less than-10 dB, the flat plate reflectivity of a key frequency band is less than-15 dB, and the surface density is lower than 8kg/m2。
4. The method for preparing the broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric base material and the metal structure as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following steps:
(1) controlling the shape and the spacing of the foam medium base material:
the foam medium base material is processed into a square block shape and is periodically arranged, the side length of the square block foam material is 4mm-65mm, and the distance between adjacent foam block materials is 1mm-20 mm;
(2) preparing a connecting material of the foam block material:
uniformly mixing a high polymer material, a curing agent and hollow glass beads under a stirring condition to obtain a joint filling connecting agent, namely a connecting material between foam blocks; the weight percentage of the macromolecular material, the curing agent and the hollow glass bead in the joint filling connecting agent is 95-9%, 5-1% and 5-91% in sequence; taking a part of gap filling connector sample, curing for 0.5-4 hours at 50-90 ℃, then carrying out electromagnetic parameter test, keeping the relative dielectric constant less than 4, and storing other uncured gap filling connectors at normal temperature for later use;
(3) and (3) mould pressing, curing and forming:
wrapping the foam block materials by using a commercial polyimide wave-transmitting film with the thickness of 2-5 mu m, then adhering high polymer materials on the FR4 medium substrate according to the arrangement mode in the step (1), filling gap filling connectors among the foam block materials, and then putting the foam block materials and the FR4 substrate into a mould; putting the mould into a drying oven, and curing for 0.5-6 hours at the temperature of 50-100 ℃ and under the pressure of 7-9 MPa;
(5) control of the metal structure composite material:
the metal structure composite material is formed by covering a plurality of square metal rings above an FR4 medium substrate, and the distance between every two adjacent square metal rings is 3-120 mm;
(6) connecting the foam medium base material with the metal structure composite material:
using high molecular material whose thickness is less than 0.2mm to adhere the metal structure material on the foamed medium base material, applying 7-9MPa, and curing at 50-90 deg.C for 0.5-4 hr.
5. The method for preparing the broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric base material and the metal structure as claimed in claim 4, wherein the method comprises the following steps: in the step (2), the curing agent is p-toluenesulfonic acid, pentosan, oxalic acid or citric acid; the particle size of the hollow glass bead is 1-50 μm.
6. The method for preparing the broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric base material and the metal structure as claimed in claim 4, wherein the method comprises the following steps: in the step (2), the step (3) and the step (6), the polymer material is phenolic resin or epoxy resin.
7. The method for preparing the broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric base material and the metal structure as claimed in claim 4, wherein the method comprises the following steps: and (4) filling a gap filling connector between the foam block material and the mold in the mold, wherein the thickness of the gap filling connector filled between the foam block material and the mold is half of the distance between the foam block materials.
8. The method for preparing the broadband electromagnetic wave absorption metamaterial based on the fusion of the foam dielectric base material and the metal structure as claimed in claim 4, wherein the method comprises the following steps: in the step (5), the thickness of the square metal ring is 25-45 μm, the outer side length of the square metal ring is 5-80 mm, and the inner side length of the square metal ring is 4-79 mm.
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| CN111585034B (en) * | 2020-06-02 | 2021-09-07 | 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 |
| 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 |
| 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 |
| US11799185B1 (en) | 2022-04-14 | 2023-10-24 | Ford Global Technologies, Llc | Multi-purpose use of metal foam in a vehicle |
| CN115674819B (en) * | 2023-01-03 | 2023-07-21 | 湖南博翔新材料有限公司 | Broadband wave-absorbing material and preparation method thereof |
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