CN113140913B - P-waveband three-dimensional broadband composite wave-absorbing metamaterial and preparation method thereof - Google Patents
P-waveband three-dimensional broadband composite wave-absorbing metamaterial and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/007—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with means for controlling the absorption
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- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
Abstract
A P-band three-dimensional broadband composite wave-absorbing metamaterial and a preparation method thereof are disclosed, wherein the P-band three-dimensional broadband composite wave-absorbing metamaterial is formed by vertically arranging structural units of metal type electromagnetic metamaterials based on magnetic metals on a ferrite medium substrate; the structural unit of the metal type electromagnetic metamaterial is formed by arranging two metal rings with different sizes on the front surface and the back surface of an FR4 dielectric substrate. The invention also discloses a preparation method of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial. The P-band three-dimensional broadband composite wave-absorbing metamaterial has the advantages of simple structure, total thickness smaller than 20 mm and low production cost, has good P-band broadband radar absorption performance in different polarization directions under the condition of vertical incidence of electromagnetic waves, has reflection loss superior to-10 dB in a P-band (230 MHz-1000 MHz) full frequency band, and has peak reflection loss up to-45.05 dB.
Description
Technical Field
The invention relates to a wave-absorbing metamaterial and a preparation method thereof, in particular to a P-band three-dimensional broadband composite wave-absorbing metamaterial and a preparation method thereof.
Background
The wave-absorbing material can effectively absorb and lose incident electromagnetic wave energy, and has wide application in the fields of military radar stealth and civil electromagnetic compatibility. The frequency of the P-band electromagnetic wave is between 0.3 and 1GHz, the wavelength spans meters and decimeters, and the P-band electromagnetic wave is a main working frequency band of the remote early warning radar, but the long wavelength brings serious challenges to the structure, thickness control and electromagnetic parameter setting of the wave absorbing material. The detectability of the ultra-low frequency long wavelength radar to weaponry is reduced, and the development of advanced and efficient P-band radar wave-absorbing materials becomes a key research direction in the field of wave-absorbing materials.
The traditional wave-absorbing material generally adopts a carbon-series wave-absorbing material made of carbon fibers, carbon nanotubes, graphite and the like as a wave-absorbing functional material, and selects a light structural material with a honeycomb structure or a foam structure and the like as a wave-absorbing matrix, and the wave-absorbing material usually has excellent high-frequency wave-absorbing performance, but has the problems of poor low-frequency wave-absorbing performance, difficult regulation and control of electromagnetic characteristics and the like.
CN108934155A discloses a ferrite-based low-frequency electromagnetic wave-absorbing material and a preparation method thereof, and the technical characteristics are as follows: the ferrite-based low-frequency electromagnetic wave-absorbing material is a particle with a similar core-shell structure; the core-shell structure comprises micron-sized lithium zinc ferrite particles and nano-sized iron sheets; the preparation method comprises sol-gel, high-temperature calcination and in-situ reduction; the lithium zinc ferrite is prepared by a sol-gel method and high-temperature calcination; and growing iron sheets on the surface of the prepared lithium zinc ferrite by an in-situ reduction method. The method has high energy consumption, and the specific wave-absorbing effect of the wave-absorbing material in the P wave band is not described.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provide a P-band three-dimensional broadband composite wave-absorbing metamaterial which is low in production cost, good in P-band electromagnetic wave absorption effect, wide in absorption bandwidth and easy to adjust and control in wave-absorbing performance.
The invention further aims to solve the technical problem of providing a preparation method of the P-band three-dimensional broadband composite wave-absorbing metamaterial with low energy consumption.
The technical scheme adopted for solving the technical problems is that the P-band three-dimensional broadband composite wave-absorbing metamaterial is formed by vertically arranging structural units of metal type electromagnetic metamaterials based on magnetic metal on a ferrite medium substrate; the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal is formed by placing two metal rings with different sizes on the front surface and the back surface of an FR4 medium substrate.
Further, the ferrite is nickel zinc ferrite, manganese zinc ferrite or magnesium zinc ferrite.
Furthermore, the FR4 medium substrate has a thickness of 0.5-3.5 mm and a dielectric constant of 3.5-4.5.
Further, the outer side length of the metal ring is 25-75 mm; the inner edge length of the metal ring is 20-70 mm.
Further, the thickness of the metal ring is 25-50 microns.
Further, the shape of the metal ring may be circular, rectangular or square, preferably square.
Further, the magnetic metal is iron, cobalt or nickel. Compared with conventional non-magnetic metals (such as copper, aluminum, silver and the like), the magnetic metal has a better magnetic coupling effect in a microwave low frequency band, and further is beneficial to improving the low frequency wave-absorbing performance of the composite wave-absorbing metamaterial.
The technical scheme adopted for further solving the technical problems is that the preparation method of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial is characterized by comprising the following steps of:
(1) cutting block ferrite material
Cutting a ferrite medium base material into a block shape with the side length same as that of a structural unit of the metal type electromagnetic metamaterial based on the magnetic metal to obtain a block ferrite material;
(2) connecting material for preparing bulk ferrite material
Uniformly stirring the high polymer material, the magnetic metal micro powder and the curing agent, and curing to obtain a connecting material of the block ferrite material;
(3) preparing ferrite medium substrate
Adhering the block ferrite material obtained in the step (1) to a polyester film by using a high polymer material, filling a connecting material of the block ferrite material obtained in the step (2) among the block ferrite materials, putting the block ferrite materials and the polyester film into an aluminum mould, putting the mould into a constant-temperature drying oven, and curing to obtain a ferrite medium substrate;
(4) structural unit for preparing metal type electromagnetic metamaterial based on magnetic metal
Covering the front and back surfaces of an FR4 medium substrate with two metal rings with different sizes by a screen printing process, and controlling the distance between the adjacent metal rings to obtain a metal type electromagnetic metamaterial structural unit based on magnetic metal; the FR4 dielectric substrate is a conventional substrate;
(5) connection of ferrite medium base material and metal type electromagnetic metamaterial
And (4) vertically bonding the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal obtained in the step (4) above the ferrite medium substrate obtained in the step (3) by using a high polymer material, and curing to obtain the P-band three-dimensional broadband composite wave-absorbing metamaterial.
Further, in the step (1), the side length of the bulk ferrite medium base material is 5-25 mm, and the distance between adjacent bulk ferrite materials is 2-14 mm.
Further, in the step (2), the weight percentages of the polymer material, the magnetic metal micro powder and the curing agent in the connecting material of the block ferrite material are respectively 90-60%, 4-38% and 6-2%.
The proper amount of the magnetic metal micro powder is added into the high polymer material and the curing agent, so that the connecting material not only can play a conventional curing and connecting role, but also can have certain wave-absorbing performance (the magnetic metal micro powder is an electromagnetic absorbent), thereby having double effects.
Further, in the step (2) and the step (3), the polymer material is thermosetting epoxy resin or phenolic resin; in the step (2), the curing agent is one or more of methyl ethyl ketone peroxide, cyclohexanone peroxide and benzoyl peroxide.
Further, in the step (2) and the step (3), the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
Further, in the step (3), the thickness of the polyester film is 0.3-0.5 mm.
And (3) filling the connection material of the block ferrite materials obtained in the step (2) among the block ferrite materials, then coating a release agent on the side wall of the die before putting the block ferrite materials and the polyester film into an aluminum die, and then filling the corresponding connection material between the block ferrite materials and the die. The thickness of the connecting material filled between the bulk ferrite material and the die is the same as that of the bulk ferrite material, and the width of the connecting material is one third of that of the bulk ferrite material.
Further, in the step (4), the metal ring is made of iron, cobalt or nickel, or an alloy of two or more of them.
Further, in the step (4), the distance between the adjacent metal rings is 3-24 mm.
Further, in the step (5), the curing pressure is 3-8 MPa; the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
Compared with the prior art, the invention has the following beneficial effects:
(1) the P-band three-dimensional broadband composite wave-absorbing metamaterial has good P-band broadband radar wave absorption performance in different polarization directions under the condition of vertical incidence of electromagnetic waves, the reflection loss in a P-band (230 MHz-1000 MHz) full frequency band is better than-10 dB, and the peak reflection loss can reach-45.05 dB;
(2) the invention utilizes the soft magnetic ferrite as the design basis of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial, combines the advantages (high resistivity, high permeability, strong eddy loss and low resonance frequency) of the soft magnetic ferrite material with the adjustable characteristic of the absorption frequency band of the electromagnetic metamaterial based on magnetic metal, and the prepared P-waveband three-dimensional broadband composite wave-absorbing metamaterial has the advantages of simple structure, low production cost, good P-waveband electromagnetic wave absorption effect, wide absorption bandwidth and easy adjustment and control of wave-absorbing performance, and can be used for designing other frequency bands by analogy according to the design;
(3) the preparation method of the P-band three-dimensional broadband composite wave-absorbing metamaterial is simple and convenient to operate, easy to modularly assemble and beneficial to engineering application.
Drawings
Fig. 1 is a front view of a unit structure of a P-band three-dimensional broadband composite wave-absorbing metamaterial according to embodiment 1 of the invention.
Fig. 2 is a side view of a unit structure of a P-band three-dimensional broadband composite wave-absorbing metamaterial in embodiment 1 of the invention.
Fig. 3 is a perspective view of a unit structure of a P-band three-dimensional broadband composite wave-absorbing metamaterial according to embodiment 1 of the invention.
Fig. 4 is a perspective view of a P-band three-dimensional broadband composite wave-absorbing metamaterial according to embodiment 1 of the invention.
Fig. 5 is a reflection loss curve diagram of the P-band three-dimensional broadband composite wave-absorbing metamaterial in the embodiment 2 of the invention in the P-band.
Detailed Description
The invention is further described with reference to the following figures and specific examples. It should be noted that the described embodiments illustrate only some of the embodiments of the invention, and should not be construed as limiting the scope of the claims. All other changes and modifications which can be made by one skilled in the art based on the embodiments of the present invention without inventive faculty are within the scope of the claims of the present application.
Example 1
The P-band three-dimensional broadband composite wave-absorbing metamaterial is formed by periodically and vertically arranging structural units of a metal type electromagnetic metamaterial based on magnetic metal iron on a manganese-zinc ferrite medium substrate; the structural unit of the metal type electromagnetic metamaterial is formed by placing two square metal rings with different sizes on the front surface and the back surface of an FR4 dielectric substrate with the thickness of 2mm and the dielectric constant of 4.2; the thickness of the square metal ring is 35 microns, the outer side length of the square ring on the front surface is 55mm, and the inner side length of the square ring on the front surface is 50 mm; the outer side length of the reverse square ring is 52mm, and the inner side length is 45 mm.
The preparation method of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial comprises the following steps:
(1) cutting ferrite material
Cutting a ferrite medium base material into a block body shape with the side length same as that of a structural unit of a metal type electromagnetic metamaterial based on magnetic metal, wherein the side length of the block body ferrite medium base material is 30mm, the distance between adjacent ferrite block materials is 4mm, and the ferrite block materials are arranged periodically to obtain a block body ferrite material;
(2) connecting material for preparing bulk ferrite material
Uniformly stirring 80%, 15% and 5% by weight of epoxy resin, magnetic metal iron powder and methyl ethyl ketone peroxide, and curing at 100 ℃ for 2 hours to obtain a connecting material of the block ferrite material;
(3) preparing ferrite medium substrate
Adhering the block ferrite material obtained in the step (1) to a 0.35mm polyester film by using epoxy resin, filling the connecting material of the block ferrite material obtained in the step (2) among the block ferrite materials, then putting the connecting material and the polyester film into an aluminum mould, putting the mould into a digital display constant temperature drying oven, and curing for 2 hours at 120 ℃ to obtain a ferrite medium substrate;
(4) structural unit for preparing metal type electromagnetic metamaterial based on magnetic metal
Covering two square metal rings with different sizes on the front and back surfaces of an FR4 medium substrate by a screen printing process, and controlling the distance between the adjacent square metal rings, wherein the thickness of each square metal ring is 35 micrometers, the outer side length of each front square ring is 55mm, and the inner side length of each front square ring is 50 mm; the outer side length of the reverse square ring is 52mm, and the inner side length is 45mm, so that a metal type electromagnetic metamaterial structural unit based on magnetic metal is obtained;
(5) connection of ferrite medium base material and metal type electromagnetic metamaterial
And (3) vertically bonding the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal obtained in the step (4) above the ferrite medium substrate obtained in the step (3) by using epoxy resin, applying 5MPa, and curing at 80 ℃ for 2h to obtain the P-waveband three-dimensional broadband composite wave-absorbing metamaterial product.
The structure diagram of the P-band three-dimensional broadband composite wave-absorbing metamaterial product of the embodiment is shown in fig. 1-4. The thickness of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial product obtained in the embodiment is 15.2mm, and the performance detection method comprises the following steps: and under the condition of vertical incidence of electromagnetic waves, detecting the effective absorption bandwidth, the peak absorption frequency and the minimum reflection loss of the P-band three-dimensional broadband composite wave-absorbing metamaterial product. The results are shown in Table 1.
Table 1 detection results of thickness, effective absorption bandwidth, peak absorption frequency and minimum reflection loss of P-band three-dimensional broadband composite wave-absorbing metamaterial product obtained in example 1
| Thickness (mm) | Effective absorption bandwidth (MHz) | Peak absorption frequency (MHz) | Minimum reflection loss |
| 15.2 | 775 | 226 | -43.65 |
Example 2
In the embodiment, the P-band three-dimensional broadband composite wave-absorbing metamaterial is formed by periodically and vertically arranging structural units of a metal type electromagnetic metamaterial based on magnetic metal nickel on a nickel-zinc ferrite medium substrate; the structural unit of the metal type electromagnetic metamaterial is formed by placing two square metal rings with different sizes on the front surface and the back surface of an FR4 dielectric substrate with the thickness of 2.5mm and the dielectric constant of 4.2; the thickness of the square metal ring is 30 micrometers, the outer side length of the square ring on the front side is 55mm, and the inner side length of the square ring on the front side is 50 mm; the outer side length of the reverse square ring is 52mm, and the inner side length is 45 mm.
The preparation method of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial comprises the following steps:
(1) cutting ferrite material
Cutting a ferrite medium base material into a block body shape with the side length same as that of a structural unit of a metal type electromagnetic metamaterial based on magnetic metal, wherein the side length of the block body ferrite medium base material is 30mm, the distance between adjacent ferrite block materials is 3 mm, and the ferrite block materials are arranged periodically to obtain a block body ferrite material;
(2) connecting material for preparing bulk ferrite material
Uniformly stirring 75%, 17% and 8% by weight of phenolic resin, magnetic metal nickel powder and cyclohexanone peroxide, and curing at 110 ℃ for 1.5h to obtain a connecting material of the block ferrite material;
(3) preparing ferrite medium substrate
Bonding the block ferrite material obtained in the step (1) on a 0.25mm polyester film by using phenolic resin, filling the connecting material of the block ferrite material obtained in the step (2) among the block ferrite materials, then putting the connecting material and the polyester film into an aluminum mould, putting the mould into a digital display constant temperature drying oven, and curing for 1.5h at 110 ℃ to obtain a ferrite medium substrate;
(4) structural unit for preparing metal type electromagnetic metamaterial based on magnetic metal
Printing two square metal rings with different sizes on the front and back surfaces of an FR4 medium substrate by a screen printing process, and controlling the distance between the adjacent square metal rings, wherein the thickness of each square metal ring is 30 micrometers, the outer side length of each front square ring is 55mm, and the inner side length of each front square ring is 50 mm; the outer side length of the reverse square ring is 52mm, and the inner side length is 45mm, so that a metal type electromagnetic metamaterial structural unit based on magnetic metal is obtained;
(5) connection of ferrite medium base material and metal type electromagnetic metamaterial
And (3) vertically bonding the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal obtained in the step (4) above the ferrite medium substrate obtained in the step (3) by using phenolic resin, applying 6.5MPa, and curing at 90 ℃ for 1.5h to obtain the P-waveband three-dimensional broadband composite wave-absorbing metamaterial product.
The thickness of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial product obtained in the embodiment is 16.5mm, and the performance detection method comprises the following steps: and under the condition of vertical incidence of electromagnetic waves, detecting the effective absorption bandwidth, the peak absorption frequency and the minimum reflection loss of the P-band three-dimensional broadband composite wave-absorbing metamaterial product. The results are shown in Table 2. The reflection loss curve of the P-band three-dimensional broadband composite wave-absorbing metamaterial obtained in the embodiment in the P-band is shown in fig. 5.
| Thickness (mm) | Effective absorption bandwidth (MHz) | Peak absorption frequency (MHz) | Minimum reflection loss |
| 16.5 | 779 | 225 | -42.50 |
Table 2 detection results of thickness, effective absorption bandwidth, peak absorption frequency and minimum reflection loss of the P-band three-dimensional broadband composite wave-absorbing metamaterial product obtained in example 2
Example 3
In the embodiment, the P-band three-dimensional broadband composite wave-absorbing metamaterial is characterized in that a metal type electromagnetic metamaterial structural unit based on magnetic metal cobalt is periodically erected on a magnesium-zinc ferrite medium substrate; the structural unit of the metal type electromagnetic metamaterial is formed by placing two square metal rings with different sizes on the front surface and the back surface of an FR4 dielectric substrate with the thickness of 2.5mm and the dielectric constant of 3.5; the thickness of the square metal ring is 25 micrometers, the outer side length of the square ring on the front side is 55mm, and the inner side length of the square ring on the front side is 45 mm; the outer side length of the reverse square ring is 50mm, and the inner side length is 42 mm.
The preparation method of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial comprises the following steps:
(1) cutting ferrite material
Cutting a ferrite medium base material into a block body shape with the side length same as that of a structural unit of a metal type electromagnetic metamaterial based on magnetic metal, wherein the side length of the block body ferrite medium base material is 30mm, the distance between adjacent ferrite block materials is 5mm, and the ferrite block materials are arranged periodically to obtain a block body ferrite material;
(2) connecting material for preparing bulk ferrite material
Uniformly stirring 70%, 24% and 6% of epoxy resin, magnetic metal cobalt powder and benzoyl peroxide in percentage by weight, and curing at 105 ℃ for 2 hours to obtain a connecting material of the block ferrite material;
(3) preparing ferrite medium substrate
Adhering the block ferrite material obtained in the step (1) to a 0.35mm polyester film by using epoxy resin, filling the connecting material of the block ferrite material obtained in the step (2) among the block ferrite materials, then putting the connecting material and the polyester film into an aluminum mould, putting the mould into a digital display constant temperature drying oven, and curing for 2 hours at 105 ℃ to obtain a ferrite medium substrate;
(4) structural unit for preparing metal type electromagnetic metamaterial based on magnetic metal
Covering two square metal rings with different sizes on the front and back surfaces of an FR4 medium substrate by a screen printing process, and controlling the distance between the adjacent square metal rings, wherein the thickness of each square metal ring is 25 micrometers, the outer side length of each front square ring is 55mm, and the inner side length of each front square ring is 45 mm; the outer side length of the reverse square ring is 50mm, and the inner side length is 42mm, so that a metal type electromagnetic metamaterial structural unit based on magnetic metal is obtained;
(5) connection of ferrite medium base material and metal type electromagnetic metamaterial
And (3) vertically bonding the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal obtained in the step (4) above the ferrite medium substrate obtained in the step (3) by using epoxy resin, applying 4MPa, and curing at 95 ℃ for 2.5 hours to obtain a P-waveband three-dimensional broadband composite wave-absorbing metamaterial product.
The thickness of the P-waveband three-dimensional broadband composite wave-absorbing metamaterial product obtained in the embodiment is 15.7mm, and the performance detection method comprises the following steps: and under the condition of vertical incidence of electromagnetic waves, detecting the effective absorption bandwidth, the peak absorption frequency and the minimum reflection loss of the P-band three-dimensional broadband composite wave-absorbing metamaterial product. The results are shown in Table 3.
| Thickness (mm) | Effective absorption bandwidth (MHz) | Peak absorption frequency (MHz) | Minimum reflection loss |
| 15.7 | 782 | 234 | -45.05 |
Table 3 detection results of thickness, effective absorption bandwidth, peak absorption frequency, and minimum reflection loss of the P-band three-dimensional broadband composite wave-absorbing metamaterial product obtained in example 3.
Claims (18)
1. A P-band three-dimensional broadband composite wave-absorbing metamaterial is characterized by being formed by vertically arranging structural units of a metal type electromagnetic metamaterial based on magnetic metal on a ferrite medium substrate; the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal is formed by placing two metal rings with different sizes on the front surface and the back surface of an FR4 medium substrate.
2. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 1, wherein the ferrite is a nickel-zinc ferrite, a manganese-zinc ferrite or a magnesium-zinc ferrite.
3. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 1 or 2, wherein the FR4 medium substrate is 0.5-3.5 mm thick and 3.5-4.5 in dielectric constant.
4. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 1 or 2, wherein the magnetic metal is iron, cobalt or nickel.
5. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 3, wherein the magnetic metal is iron, cobalt or nickel.
6. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 1 or 2, wherein the thickness of the metal ring is 25-50 microns; the outer side length of the metal ring is 25-75 mm; the inner edge length of the metal ring is 20-70 mm.
7. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 3, wherein the thickness of the metal ring is 25-50 microns; the outer side length of the metal ring is 25-75 mm; the inner edge length of the metal ring is 20-70 mm.
8. The P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 4, wherein the thickness of the metal ring is 25-50 microns; the outer side length of the metal ring is 25-75 mm; the inner edge length of the metal ring is 20-70 mm.
9. A preparation method of the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 1 or 2, characterized by comprising the following steps:
(1) cutting ferrite material
Cutting a ferrite medium base material into a block shape with the side length same as that of a structural unit of the metal type electromagnetic metamaterial based on the magnetic metal to obtain a block ferrite material;
(2) preparation of connecting material of bulk ferrite material
Uniformly stirring the high polymer material, the magnetic metal micro powder and the curing agent, and curing to obtain a connecting material of the block ferrite material;
(3) ferrite dielectric substrate preparation
Adhering the block ferrite material obtained in the step (1) to a polyester film by using a high polymer material, filling a connecting material of the block ferrite material obtained in the step (2) among the block ferrite materials, putting the block ferrite materials and the polyester film into an aluminum mould, putting the mould into a constant-temperature drying oven, and curing to obtain a ferrite medium substrate;
(4) preparation of structural unit of metal type electromagnetic metamaterial based on magnetic metal
Covering the front and back surfaces of an FR4 medium substrate with two metal rings with different sizes by a screen printing process, and controlling the distance between the adjacent metal rings to obtain a metal type electromagnetic metamaterial structural unit based on magnetic metal;
(5) connection of ferrite medium base material and metal type electromagnetic metamaterial
And (4) vertically bonding the structural unit of the metal type electromagnetic metamaterial based on the magnetic metal obtained in the step (4) above the ferrite medium substrate obtained in the step (3) by using a high polymer material, and curing to obtain the P-band three-dimensional broadband composite wave-absorbing metamaterial.
10. The preparation method of the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 9, wherein in the step (2), the weight percentages of the polymer material, the magnetic metal micro powder and the curing agent in the connecting material of the bulk ferrite material are 90-60%, 4-38% and 6-2%, respectively.
11. The method for preparing the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 9, wherein in the steps (2) and (3), the polymer material is thermosetting epoxy resin or phenolic resin; in the step (2), the curing agent is one or more of methyl ethyl ketone peroxide, cyclohexanone peroxide and benzoyl peroxide.
12. The method for preparing the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 10, wherein in the step (2) and the step (3), the polymer material is thermosetting epoxy resin or phenolic resin; in the step (2), the curing agent is one or more of methyl ethyl ketone peroxide, cyclohexanone peroxide and benzoyl peroxide.
13. The method for preparing the P-waveband three-dimensional broadband composite wave-absorbing metamaterial according to claim 9, wherein in the step (2) and the step (3), the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
14. The method for preparing the P-waveband three-dimensional broadband composite wave-absorbing metamaterial according to claim 10, wherein in the step (2) and the step (3), the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
15. The method for preparing the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 9, wherein in the step (5), the curing pressure is 3 MPa to 8 MPa; the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
16. The method for preparing the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 10, wherein in the step (5), the curing pressure is 3 MPa to 8 MPa; the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
17. The method for preparing the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 11, wherein in the step (5), the curing pressure is 3 MPa to 8 MPa; the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
18. The method for preparing the P-band three-dimensional broadband composite wave-absorbing metamaterial according to claim 13, wherein in the step (5), the curing pressure is 3 MPa to 8 MPa; the curing temperature is 120-180 ℃; the curing time is 1.5-3.0 h.
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