CN109897214A - Inhale wave honeycomb and its production method - Google Patents
Inhale wave honeycomb and its production method Download PDFInfo
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- CN109897214A CN109897214A CN201711299367.8A CN201711299367A CN109897214A CN 109897214 A CN109897214 A CN 109897214A CN 201711299367 A CN201711299367 A CN 201711299367A CN 109897214 A CN109897214 A CN 109897214A
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Abstract
This application provides a kind of suction wave honeycombs and its production method.The suction wave honeycomb includes honeycomb core and two absorbent structures being arranged on the surface of honeycomb core, two absorbent structures are symmetrical arranged relative to the median plane of honeycomb core, and each absorbent structure includes inhaling wave layer along the first suction wave layer, the second suction wave layer and the third for being sequentially stacked setting far from honeycomb core direction.The suction wave honeycomb is equal there are three wave layer is inhaled in the upper and lower surface of honeycomb core, so that the absorbing property of the suction wave honeycomb is promoted, and in same absorbing property, density is smaller.
Description
Technical field
This application involves Material Fields, in particular to a kind of suction wave honeycomb and its production method.
Background technique
Honeycomb has the characteristics that high compressive strength, high specific strength prepreg and high specific stiffness, is that excellent lightweight is high
Strong structure material.
Currently, honeycomb absorbing material is made of the honeycomb core of higher electromagnetic parameter, the panel of wave transparent and metal base plate.
In order to improve the electromagnetic parameter of honeycomb core, it is typically employed on normal cellular core and impregnates highly conductive absorbing material for example, existing
Suction wave honeycomb mainly pass through finished product aramid fiber paper honeycomb dipping conductive carbon black inhale wave after obtain.But this suction wave honeycomb
The absorbing property of structure is poor.
Summary of the invention
The main purpose of the application is to provide a kind of suction wave honeycomb and its production method, to solve in the prior art
Inhale the poor problem of the absorbing property of wave honeycomb.
To achieve the goals above, according to the one aspect of the application, a kind of suction wave honeycomb is provided, the suction wave bee
Nest structure includes honeycomb core and two absorbent structures being arranged on the surface of above-mentioned honeycomb core, and two above-mentioned absorbent structures are opposite
It is symmetrical arranged in the median plane of above-mentioned honeycomb core, and each above-mentioned absorbent structure includes being sequentially stacked along far from above-mentioned honeycomb core direction
First be arranged inhales wave layer, the second suction wave layer and third and inhales wave layer.
Further, in percentage by weight, it is above-mentioned first inhale wave layer raw material, it is above-mentioned second inhale wave layer raw material with
Above-mentioned third inhale wave layer raw material include 20~50% resin, 5~30% absorbing material and 20~70% solvent,
In, above-mentioned resin is selected from one of phenolic resin, epoxy resin, polyurethane resin or polyimide resin or a variety of；It is above-mentioned
Absorbing material be selected from one of short fine carbon fiber, short fine graphene fiber, graphene oxide, carbonyl iron dust and carbon nanotube or
It is a variety of；Above-mentioned solvent is selected from one of N,N-Dimethylformamide, acetic acid, ethyl ester, methanol, n-hexane, acetone and water or more
Kind.
Further, the raw material of above-mentioned first suction wave layer includes 30% epoxy resin, 10% short fine graphene fiber
With 60% solvent.
Further, the above-mentioned second raw material for inhaling wave layer includes 30% epoxy resin, 30% carbonyl iron dust and 40%
Solvent.
Further, the raw material that above-mentioned third inhales wave layer includes 30% epoxy resin, 5% carbon nanotube and 65%
Solvent.
According to the another aspect of the application, a kind of production method for inhaling wave honeycomb is provided, which includes:
Honeycomb core is placed in the first suction wave raw material and impregnates by step S1, forms the first pre- structure；Step S2, by the above-mentioned first pre- structure
It is placed in the second suction wave raw material and impregnates, form the second pre- structure；Above-mentioned second pre- structure is placed in third and inhales wave raw material by step S3
Solidify after middle immersion, form above-mentioned suction wave honeycomb, wherein above-mentioned suction wave honeycomb includes inhaling wave raw material by above-mentioned first
First formed, which inhales wave layer, the second suction wave layer formed by above-mentioned second suction wave raw material and inhale wave raw material by above-mentioned third, to be formed
Third inhale wave layer.
Further, it includes 20 that above-mentioned first suction wave raw material, above-mentioned second suction wave raw material and above-mentioned third, which inhale wave raw material,
~50% resin, 5~30% absorbing material and 20~70% solvent, wherein above-mentioned resin be selected from phenolic resin, epoxy
One of resin, polyurethane resin or polyimide resin are a variety of；Above-mentioned absorbing material is selected from short fine carbon fiber, short fine stone
One of black alkene fiber, graphene oxide, carbonyl iron dust and carbon nanotube are a variety of；Above-mentioned solvent is selected from nitrogen nitrogen dimethyl methyl
One of amide, acetic acid, ethyl ester, methanol, n-hexane, acetone and water are a variety of.
Further, above-mentioned first suction wave raw material include 30% epoxy resin, 10% short fine graphene fiber with
60% solvent.
Further, it is above-mentioned second suction wave raw material include 30% epoxy resin, 30% carbonyl iron dust with 40% it is molten
Agent.
Further, above-mentioned third inhale wave raw material include 30% epoxy resin, 5% carbon nanotube with 65% it is molten
Agent.
Using the technical solution of the application, the upper and lower surface of honeycomb core is there are three wave layer is inhaled, so that the suction wave honeycomb knot
The absorbing property of structure is promoted, and in same absorbing property, density is smaller.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 shows a kind of structural schematic diagram of suction wave honeycomb of the application；And
Fig. 2 shows the structural schematic diagrams of the honeycomb core of the application.
Wherein, the above drawings include the following reference numerals:
1, honeycomb core；2, first inhales wave layer；3, second inhales wave layer；4, third inhales wave layer.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, the absorbing property in the prior art for inhaling wave honeycomb is poor, in order to solve
Technical problem as above, present applicant proposes a kind of suction wave honeycombs and its production method.
This application provides a kind of suction wave honeycombs, as shown in Figure 1, the suction wave honeycomb includes honeycomb core 1 and set
Set two absorbent structures on above-mentioned 1 surface of honeycomb core, wherein the structure of honeycomb core is as shown in Fig. 2, two above-mentioned suction wave knots
Structure is symmetrical arranged relative to the median plane of above-mentioned honeycomb core 1, and each above-mentioned absorbent structure includes along far from above-mentioned 1 direction of honeycomb core
It is sequentially stacked the first of setting and inhales the suction wave layer 3 of wave layer 2, second and third suction wave layer 4.
In above-mentioned suction wave honeycomb, equal there are three wave layer is inhaled in the upper and lower surfaces of honeycomb core, this makes the suction wave bee
The absorbing property of nest structure is promoted, and in same absorbing property, density is smaller.
In order to further increase the absorbing property for inhaling wave honeycomb, in a kind of embodiment of the application, according to weight hundred
Divide than meter, above-mentioned first inhales the raw material of wave layer 2, the raw material that the above-mentioned second raw material for inhaling wave layer 3 inhales wave layer 4 with third includes 20
~50% resin, 5~30% absorbing material and 20~70% solvent, wherein above-mentioned resin be selected from phenolic resin, epoxy
One of resin, polyurethane resin or polyimide resin are a variety of；Above-mentioned absorbing material is selected from short fine carbon fiber, short fine stone
One of black alkene fiber, graphene oxide, carbonyl iron dust and carbon nanotube are a variety of；Above-mentioned solvent is selected from nitrogen nitrogen dimethyl methyl
One of amide, acetic acid, ethyl ester, methanol, n-hexane, acetone and water are a variety of.
The first of the application inhales various in the raw material of the raw material of wave layer, the raw material of the second suction wave layer and third suction wave layer
Material is not limited to the above-mentioned material enumerated, and weight percent is also not necessarily limited to above-mentioned range, and those skilled in the art can be with
It selects suitable material and suitable parts by weight to be formed according to the actual situation and inhales wave raw material.
In a kind of embodiment of the application, it is above-mentioned first suction wave layer 2 raw material include 30% epoxy resin, 10% it is short
Fine graphene fiber and 60% solvent, can be further improved the absorbing property for inhaling wave honeycomb in this way, and further mention
High cellular structural strength.
In order to further increase the absorbing property for inhaling wave honeycomb.In a kind of embodiment of the application, above-mentioned second inhales
The raw material of wave layer 3 include 30% epoxy resin, 30% carbonyl iron dust and 40% solvent.
In another embodiment of the application, above-mentioned third inhale wave layer 4 raw material include 30% epoxy resin, 5%
Carbon nanotube and 65% solvent, can be further improved the absorbing property for inhaling wave honeycomb, and further increase bee in this way
The structural strength of nest.
In the typical embodiment of the another kind of the application, a kind of production method for inhaling wave honeycomb, the system are provided
Include: step S1 as method, honeycomb core is placed in the first suction wave raw material and is impregnated, forms the first pre- structure；Step S2, will be above-mentioned
First pre- structure, which is placed in the second suction wave raw material, impregnates, and forms the second pre- structure；Above-mentioned second pre- structure is placed in by step S3
Solidify after being impregnated in three suction wave raw materials, is formed and inhale wave honeycomb, wherein above-mentioned suction wave honeycomb includes being inhaled by above-mentioned first
First suction wave layer of wave raw material formation inhales the second suction wave layer and inhale wave original by above-mentioned third that wave raw material is formed by above-mentioned second
The third that material is formed inhales wave layer, and then forms suction wave honeycomb shown in FIG. 1.
In above-mentioned production method, by impregnating three times, and the suction wave raw material impregnated every time is different, in this way in honeycomb core
Three layers of different suction wave layer are formed on surface, so that the absorbing property of the suction wave honeycomb is promoted.
In the another embodiment of the application, above-mentioned first, which inhales wave raw material, above-mentioned second suction wave raw material and above-mentioned third, inhales
Wave raw material include 20~50% resin, 5~30% absorbing material and 20~70% solvent, wherein the choosing of above-mentioned resin
From one of phenolic resin, epoxy resin, polyurethane resin or polyimide resin or a variety of；Above-mentioned absorbing material is selected from short
One of fine carbon fiber, short fine graphene fiber, graphene oxide, carbonyl iron dust and carbon nanotube are a variety of；Above-mentioned solvent
Selected from one of N,N-Dimethylformamide, acetic acid, ethyl ester, methanol, n-hexane, acetone and water or a variety of.It in this way can be into
One step guarantees that inhaling wave honeycomb has preferable absorbing property.
The a variety of materials that the first suction wave raw material, the second suction wave raw material and the third of the application are inhaled in wave raw material are not limited to
The above-mentioned material enumerated, and weight percent is also not necessarily limited to above-mentioned range, those skilled in the art can be according to the actual situation
It selects suitable material and suitable parts by weight to be formed and inhales wave raw material.
In order to further increase the absorbing property for inhaling the first suction wave layer in wave honeycomb, and then further increases and inhale wave bee
The absorbing property of nest structure, and the intensity of honeycomb is further increased, in a kind of embodiment of the application, above-mentioned first inhales wave
Raw material includes 30% epoxy resin, 10% short fine graphene fiber and 60% solvent.
Similarly, it in order to further increase the absorbing property for inhaling the second suction wave layer in wave honeycomb, and then further mentions
Height inhales the absorbing property of wave honeycomb, and expands cellular suction wavestrip tent, and above-mentioned second suction wave raw material includes 30% ring
Oxygen resin, 30% carbonyl iron dust and 40% solvent.
In another embodiment of the application, it includes 30% epoxy resin, 5% carbon nanometer that above-mentioned third, which inhales wave raw material,
Manage the solvent with 65%.It can be further improved in this way and inhale the absorbing property that third in wave honeycomb inhales wave layer, and then into one
Step improves the absorbing property for inhaling wave honeycomb, and further increases the intensity of honeycomb.
In order to further ensure the various solidification effects for inhaling wave raw material, and then it is further ensured that the suction wave for inhaling wave honeycomb
Performance in a kind of embodiment of the application, implements above-mentioned steps S4 using heat cure, and cured temperature 80~250 DEG C it
Between.
In order to enable those skilled in the art can clearly understand the technical solution of the application, below with reference to tool
The embodiment of body illustrates the technical solution of the application.
Embodiment 1
Inhale wave honeycomb manufacturing process include:
Honeycomb core is placed in the first suction wave raw material and impregnates by step S1, forms the first pre- structure.
First suction wave raw material includes 30% epoxy resin, 10% short fine graphene fiber and 60% nitrogen nitrogen dimethyl
Formamide, and the time impregnated is 30min.
Above-mentioned first pre- structure is placed in the second suction wave raw material and impregnates by step S2, forms the second pre- structure.
Second suction wave raw material include 30% epoxy resin, 30% carbonyl iron dust with 40% acetic acid, and dipping when
Between be 30min.
Above-mentioned second pre- structure is placed in third suction wave raw material after impregnating and solidifies, forms the suction wave honeycomb knot by step S3
Structure.
Third inhale wave raw material include 30% epoxy resin, 5% carbon nanotube with 65% ethyl ester.And the time of dipping
For 30min.And heat cure is carried out after steeping, cured temperature is 150 DEG C, and the cured time is 4h, so that above-mentioned first inhales
Wave raw material forms the first suction wave layer on the surface of honeycomb core, and above-mentioned second suction wave raw material is formed on the basis of the first suction wave layer
Second inhales wave layer, and above-mentioned third inhales wave raw material and forms third suction wave layer on the basis of second inhales wave layer, and then is formed by three layers
Wave layer is inhaled along the suction wave honeycomb for being sequentially stacked setting far from above-mentioned honeycomb core direction.
Embodiment 2
The difference from embodiment 1 is that:
First suction wave raw material includes 20% phenolic resin, 10% short fine carbon fiber and 70% methanol；Second inhales wave
Raw material includes 20% phenolic resin, 30% short fine graphene fiber and 50% acetone；It includes 20% that third, which inhales wave raw material,
Phenolic resin, 20% carbon nanotube with 60% ethyl ester.Heat curing temperature is 250 DEG C, time 1h.
Embodiment 3
The difference from embodiment 1 is that:
First suction wave raw material include 50% polyurethane resin, 5% carbon nanotube with 45% n-hexane；Second inhales wave
Raw material include 50% polyurethane resin, 30% graphene oxide and 20% acetone；It includes 50% that third, which inhales wave raw material,
Polyurethane resin, 25% carbonyl iron dust and 25% ethyl ester.Heat curing temperature is 80 DEG C, time 6h.
Embodiment 4
Difference with embodiment 3 is:
First suction wave raw material include 40% polyimide resin, 15% graphene oxide and 45% acetic acid；Second
Inhale polyimide resin, 20% short fine carbon fiber and 40% n-hexane that wave raw material includes 40%；Third inhales wave raw material packet
Include 40% polyimide resin, 30% carbon nanotube with 30% methanol.Heat curing temperature is 95 DEG C, time 5h.
Embodiment 5
Difference with embodiment 4 is:
First suction wave raw material include 45% phenolic resin, 15% carbonyl iron dust and 40% n-hexane；Second inhales wave
Raw material includes 45% polyimide resin, 30% short fine graphene fiber and 25% N,N-Dimethylformamide；Third
Inhale wave raw material include 45% epoxy resin, 5% graphene oxide and 50% ethyl ester.Heat curing temperature is 105 DEG C, the time
For 4h.
Embodiment 6
Difference with embodiment 5 is: first suction wave raw material include 25% phenolic resin, 15% epoxy resin,
25% short fine graphene fiber and 35% ethyl ester；Second suction wave raw material includes 45% polyimide resin, 5% epoxy
Resin, 30% carbon nanotube and 20% N,N-Dimethylformamide；Third inhales the polyimides tree that wave raw material includes 15%
Rouge, 15% phenolic resin, 30% short fine carbon fiber and 40% acetone.Heat curing temperature is 150 DEG C, time 3h.
Embodiment 7
Difference with embodiment 6 is: the first suction wave raw material include 45% phenolic resin, 15% short fine carbon fiber,
15% carbonyl iron dust and 25% n-hexane；Second suction wave raw material includes 20% polyimide resin, 20% short fine stone
Black alkene fiber, 10% carbon nanotube and 50% acetone；It includes 50% epoxy resin, 15% oxidation that third, which inhales wave raw material,
Graphene, 5% carbonyl iron dust and 30% ethyl ester.Heat curing temperature is 190 DEG C, time 2h.
Embodiment 8
Difference with embodiment 7 is: first suction wave raw material include 15% polyurethane resin, 15% phenolic resin,
25% graphene oxide and 45% methanol；Second suction wave raw material includes 35% polyimide resin, 15% asphalt mixtures modified by epoxy resin
Rouge, 20% carbon nanotube and 30% acetone；It includes 10% polyimide resin, 30% phenolic aldehyde tree that third, which inhales wave raw material,
Rouge, 30% short fine carbon fiber and 40% n-hexane.Heat curing temperature is 150 DEG C, time 3h.
Comparative example 1
Aramid paper inhale wave honeycomb manufacturing process include:
The aramid fiber paper honeycomb core of finished product is placed in inhale and impregnates 30min in wave raw material, forms pre-suction wave honeycomb knot by step S1
Structure.Suction wave raw material is conductive carbon black.
Step S2 carries out heat cure to above-mentioned pre-suction wave honeycomb, and cured temperature is 100 DEG C, when above-mentioned cured
Between 2h so that above-mentioned suction wave raw material formed inhale wave layer, and then formed aramid paper inhale wave honeycomb.
Using arch field reflectance test system, the suction wave honeycomb in each embodiment and comparative example is tested in 2-
Suction wave loss value in the band limits of 18GHz tests each density for inhaling wave honeycomb using densimetry, specific to test
It the results are shown in Table 1.
Table 1
| It inhales wave loss value (dB) | Compressive strength (MPa) | Density (g/cm3) | |
| Embodiment 1 | -7 | 15 | 100 |
| Embodiment 2 | -5 | 30 | 90 |
| Embodiment 3 | -4.9 | 23 | 98 |
| Embodiment 4 | -6.5 | 20 | 95 |
| Embodiment 5 | -6.4 | 19 | 100 |
| Embodiment 6 | -6 | 12 | 110 |
| Embodiment 7 | -5.2 | 12 | 95 |
| Embodiment 8 | -5.4 | 12.5 | 103 |
| Comparative example 1 | -2.3 | 6 | 176 |
By above-mentioned test result it is found that absorbing property of the embodiment 1 to 8 in the frequency range of 2-18GHz is preferable, and compress strong
Spend larger, density further decreases；Compared with comparative example 1, suction wave honeycomb of the embodiment of the present invention 1 into embodiment 8
Its absorbing property is greatly improved, and compressive strength is at least doubled, has stronger structural strength, obtained in terms of density
It is further to reduce, so that the suction wave honeycomb has smaller density under conditions of same absorbing property, thus using
Range is further extended.
It can be seen from the above description that the application the above embodiments realize following technical effect:
1) equal there are three wave layer is inhaled in the upper and lower surface of honeycomb core, in the suction wave honeycomb of the application, so that the suction wave
The absorbing property of honeycomb is promoted, and in same absorbing property, density is smaller.
2), in the production method of the application, by impregnating three times, and the suction wave raw material impregnated every time is different, in this way in bee
Three layers of different suction wave layer are formed on the surface of nest core, so that the absorbing property of the suction wave honeycomb is promoted, and are being inhaled on an equal basis
When wave performance, density is smaller.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of suction wave honeycomb, which is characterized in that the suction wave honeycomb includes honeycomb core (1) and is arranged in the bee
Two absorbent structures on the surface of nest core (1), two absorbent structures are symmetrical relative to the median plane of the honeycomb core (1)
Setting, and each absorbent structure include along far from the honeycomb core (1) direction be sequentially stacked setting first inhale wave layer (2),
Second inhales wave layer (3) and third suction wave layer (4).
2. suction wave honeycomb according to claim 1, which is characterized in that in percentage by weight, described first inhales
The raw material that the raw material of wave layer (2), the described second raw material for inhaling wave layer (3) inhale wave layer (4) with the third includes 20~50%
Resin, 5~30% absorbing material and 20~70% solvent, wherein the resin be selected from phenolic resin, epoxy resin,
One of polyurethane resin or polyimide resin are a variety of；The absorbing material is selected from short fine carbon fiber, short fine graphene
One of fiber, graphene oxide, carbonyl iron dust and carbon nanotube are a variety of；The solvent is selected from nitrogen nitrogen dimethyl formyl
One of amine, acetic acid, ethyl ester, methanol, n-hexane, acetone and water are a variety of.
3. suction wave honeycomb according to claim 1, which is characterized in that it is described first inhale wave layer (2) raw material include
30% epoxy resin, 10% short fine graphene fiber and 60% solvent.
4. suction wave honeycomb according to claim 1, which is characterized in that it is described second inhale wave layer (3) raw material include
30% epoxy resin, 30% carbonyl iron dust and 40% solvent.
5. suction wave honeycomb according to claim 1, which is characterized in that the raw material that the third inhales wave layer (4) includes
30% epoxy resin, 5% carbon nanotube and 65% solvent.
6. a kind of production method for inhaling wave honeycomb, which is characterized in that the production method includes:
Honeycomb core is placed in the first suction wave raw material and impregnates by step S1, forms the first pre- structure；
Described first pre- structure is placed in the second suction wave raw material and impregnates by step S2, forms the second pre- structure；
Described second pre- structure is placed in third suction wave raw material after impregnating and solidifies, forms the suction wave honeycomb by step S3,
Wherein, the suction wave honeycomb include by
It is described first suction wave raw material formed first suction wave layer, by it is described second suction wave raw material is formed second suction wave layer and
The third that wave raw material is formed is inhaled by the third and inhales wave layer.
7. production method according to claim 6, which is characterized in that described first inhales wave raw material, the second suction wave original
Material with the third inhale wave raw material include 20~50% resin, 5~30% absorbing material and 20~70% solvent,
In,
The resin is selected from one of phenolic resin, epoxy resin, polyurethane resin or polyimide resin or a variety of；It is described
Absorbing material be selected from one of short fine carbon fiber, short fine graphene fiber, graphene oxide, carbonyl iron dust and carbon nanotube or
It is a variety of；The solvent is selected from one of N,N-Dimethylformamide, acetic acid, ethyl ester, methanol, n-hexane, acetone and water or more
Kind.
8. production method according to claim 6, which is characterized in that the first suction wave raw material includes 30% asphalt mixtures modified by epoxy resin
Rouge, 10% short fine graphene fiber and 60% solvent.
9. production method according to claim 6, which is characterized in that the second suction wave raw material includes 30% asphalt mixtures modified by epoxy resin
Rouge, 30% carbonyl iron dust and 40% solvent.
10. production method according to claim 6, which is characterized in that the third inhales the epoxy that wave raw material includes 30%
Resin, 5% carbon nanotube and 65% solvent.
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| CN110290689A (en) * | 2019-06-24 | 2019-09-27 | 西安安聚德纳米科技有限公司 | A kind of low frequency and wideband microwave absorbing material and preparation method thereof |
| CN110978707A (en) * | 2019-11-06 | 2020-04-10 | 航天科工武汉磁电有限责任公司 | Light broadband multi-band strong-absorption double-layer-structure honeycomb wave absorption plate and preparation method thereof |
| CN112208157A (en) * | 2019-07-12 | 2021-01-12 | 中国科学院苏州纳米技术与纳米仿生研究所 | Carbon foam filled carbon nanotube honeycomb electromagnetic shielding material and preparation method and application thereof |
| CN113150376A (en) * | 2021-04-14 | 2021-07-23 | 哈尔滨工业大学 | Simulation and preparation method of double-layer ultra-wideband thin wave-absorbing metamaterial |
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| CN113150376A (en) * | 2021-04-14 | 2021-07-23 | 哈尔滨工业大学 | Simulation and preparation method of double-layer ultra-wideband thin wave-absorbing metamaterial |
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