CN108068410A - A kind of lightweight broad-band electromagnetic-wave absorbent and preparation method thereof - Google Patents
A kind of lightweight broad-band electromagnetic-wave absorbent and preparation method thereof Download PDFInfo
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- CN108068410A CN108068410A CN201711350727.2A CN201711350727A CN108068410A CN 108068410 A CN108068410 A CN 108068410A CN 201711350727 A CN201711350727 A CN 201711350727A CN 108068410 A CN108068410 A CN 108068410A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/067—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of fibres or filaments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2571/00—Protective equipment
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Abstract
The present invention provides a kind of lightweight broad-band electromagnetic-wave absorbents and preparation method thereof, are related to electromagnetic wave absorption material field.The lightweight broad-band electromagnetic-wave absorbent, including using the cured fiberglass cloth of epoxy jelly membrane, suction ripple layer of cloth and conductive layer of cloth successively, conductive layer of cloth has multiple repeated arrangements and " returning " the character form structure unit being made of the first conductive part and the second conductive part.Its preparation method includes：The conductive fabric of different electrical conductivity is engraved as to " returning " character form structure unit of multiple repeated arrangements, then the conductive fabric carved is stacked, forms conductive layer of cloth；It prepares and inhales ripple layer of cloth；Glass fabric, suction ripple layer of cloth and conductive layer of cloth epoxy jelly membrane are cured successively.This lightweight broad-band electromagnetic-wave absorbent has the characteristics that thickness is thin, light-weight and mechanical property is good；It has in 4~18GHz relatively inhales by force ripple.
Description
Technical field
The present invention relates to electromagnetic wave absorption material field, in particular to a kind of lightweight broad-band electromagnetic-wave absorbent and
Its preparation method.
Background technology
With the fast development of modern electronic technology, various New Type Radar detectors are come out one after another, and countries in the world are in the air
Defence capability and anti-guided missile ability be increasingly enhanced so that the threat that faces of the large size operational weapon such as aircraft, guided missile increasingly sharpens.
Radar absorbing is as the effective means for improving weapon system survival ability and penetration ability, the work in modern military is stealthy
It is the hot spot of Modern World various countries research concern with very prominent with status.
Fiberglass absorbing material is added in wave absorbing agent and is formed by multi-layer fiber cloth, resin, can realize low frequency, width with multiple-layer stacked
Frequency band inhales ripple, therefore is a kind of up-and-coming absorbing material.But fiberglass absorbing material thickness is usually thicker, and due to adding in
Substantial amounts of wave absorbing agent causes its heavier-weight and interlaminar shear strength relatively low, so as to limit its extensive application.
The content of the invention
The first object of the present invention is to provide a kind of lightweight broad-band electromagnetic-wave absorbent, and the absorbing material is compared with tradition
Absorbing material, have the characteristics that thickness is thin, light-weight and mechanical property is good；It has in 4GHz~18GHz relatively inhales by force ripple rate.
The second object of the present invention is to provide a kind of preparation method of above-mentioned lightweight broad-band electromagnetic-wave absorbent, the preparation
Method is simply easily implemented, and the suction wave frequency section of obtained lightweight broad-band electromagnetic-wave absorbent is adjustable.
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
A kind of lightweight broad-band electromagnetic-wave absorbent, including using the cured fiberglass cloth of epoxy jelly membrane successively, inhaling ripple
Layer of cloth and conductive layer of cloth, conductive layer of cloth have multiple repeated arrangements and " returning " for being made of the first conductive part and the second conductive part
Character form structure unit.
A kind of preparation method of above-mentioned lightweight broad-band electromagnetic-wave absorbent, including：
The conductive fabric of different electrical conductivity is engraved as to " returning " character form structure unit of multiple repeated arrangements, then will carve
Conductive fabric stacks, and forms conductive layer of cloth；
I types antiradar coatings and II types antiradar coatings are layed on glass fabric respectively, I types is obtained and inhales ripple layer of cloth and II
Type inhales ripple layer of cloth, then between I types inhale ripple layer of cloth and II types inhale ripple layer of cloth epoxy jelly membrane is added to cure to obtain suction ripple layer of cloth；
Glass fabric, suction ripple layer of cloth and conductive layer of cloth epoxy jelly membrane are cured successively.
Compared with prior art, beneficial effects of the present invention for example including：
This lightweight broad-band electromagnetic-wave absorbent that present disclosure provides, has that thickness is thin, light-weight and mechanical property
The characteristics of good；Its vertical reflectivity in 4~18GHz is less than -10dB, has and relatively inhales ripple by force；In addition, by reasonably adjusting this
The size, conductive fabric sheet resistance and glass-reinforced plastic material thickness of " returning " character form structure unit, can adjust the suction of the electromagnetic wave absorption structure
Wave frequency section.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is the structure diagram of the lightweight broad-band electromagnetic-wave absorbent provided in embodiment of the present invention；
Fig. 2 is the structural representation of the structural unit of the lightweight broad-band electromagnetic-wave absorbent provided in embodiment of the present invention
Figure；
Fig. 3 is that the structure under the first visual angle of the lightweight broad-band electromagnetic-wave absorbent provided in embodiment of the present invention is shown
It is intended to；
Fig. 4 is that I types inhale ripple cloth electromagnetic parameter in the lightweight broad-band electromagnetic-wave absorbent provided in embodiment of the present invention；
II types inhale ripple cloth electromagnetic parameter in the lightweight broad-band electromagnetic-wave absorbent provided in Fig. 5 embodiment of the present invention.
Label：100- lightweight broad-band electromagnetic-wave absorbents；110- fiberglass cloths；120- inhales ripple layer of cloth；121-I types are inhaled
Ripple layer of cloth；122-II types inhale ripple layer of cloth；130- conduction layer of cloths；131- structural units；The first conductive parts of 132-；133- second is conductive
Portion；140- epoxy jelly membranes.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person, the condition suggested according to normal condition or manufacturer carry out.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
Present embodiment provides a kind of lightweight broad-band electromagnetic-wave absorbent 100, structure as shown in Figure 1, Figure 2 and Figure 3, this
Kind lightweight broad-band electromagnetic-wave absorbent 100 including three functional layers, that is, is followed successively by fiberglass cloth 110, inhales ripple layer of cloth 120
With conductive layer of cloth 130.
Wherein, conductive layer of cloth 130 has the structural unit 131 of multiple repeated arrangements, and this structural unit 131 is " returning " word
Shape structure, as shown in Fig. 2, this " time " character form structure is made of the first conductive part 132 and the second conductive part 133.This first is led
Electric portion 132 is the peripheral frame of structural unit 131, and cross section is side's annular；Second conductive part 133 is structural unit 131
Kernel, cross section for square.
The structure of this " time " font has the insensitive and wide-angle characteristic that polarizes, to the TE and TM that incidence angle is 45 °
Ripple remains to realize that ultra wide band inhales ripple.
In some embodiments of the invention, the peripheral frame of first conductive part 132 is square frame, the square
The length of side B of frame is that 3.5~4.5mm is either 3.8~4.2mm or is 4.0mm；The width D of the square frame is
0.25~0.35mm is either 0.27~0.33mm or is 0.30mm.The length of side C of second conductive part 133 of the square is
2.5~3.5mm is either 2.7~3.2mm or is 3.0mm.In addition, between the first conductive part 132 and the second conductive part 133
Gap E, width is 0.18~0.22 to be either 0.19~0.21 or be 0.22.
Further, conductive layer of cloth 130 is by frequently metamaterial layer being selected to be formed.It is a kind of new suction that Meta Materials, which inhale wave technology,
Wave technology can realize desirable refractive index, dielectric constant and magnetic conductivity, Meta Materials by the design of metamaterial structure
Have the advantages that thickness is thin, light-weight, but its suction wave frequency section is relatively narrow.Present embodiment is by by Meta Materials and traditional absorbing material
It is combined, Meta Materials is made full use of to inhale the controllability of wave frequency section to improve the low frequency wave-absorbing effect of traditional absorbing material, simultaneously
The shortcomings that wave frequency section is narrow is inhaled to make up Meta Materials using traditional absorbing material, the two is combined together so that the suction ripple material
Material is with low frequency, the characteristic of broadband absorbing.
Further, conductive layer of cloth 130 selects metamaterial layer including four layers of frequency stacked successively, and four layers of frequency select Meta Materials
Layer the electrical conductivity on the direction for inhaling ripple layer of cloth 120 (i.e. in Fig. 3 from top to bottom) be followed successively by 150~170Siemens/m,
90~110Siemens/m, 600~800Siemens/m, 1400~1600Siemens/m；Or it is followed successively by 155~
165Siemens/m, 95~105Siemens/m, 650~750Siemens/m, 1450~1550Siemens/m；Or successively
For 160Siemens/m, 100Siemens/m, 700Siemens/m, 1500Siemens/m.It arranges in the manner described above, it can be with
The bandwidth of absorbing material is effectively expanded, while with the increase for selecting metamaterial layer frequently, wave-absorbing effect is more preferable, inhales wave frequency band and broadens,
It is more stable with interior wave-absorbing effect.
Further, inhale ripple layer of cloth 120 be included on the direction away from fiberglass cloth 110 (i.e. in Fig. 3 by down toward
On) the I types that stack successively inhale ripple layer of cloth 121 and II types inhale ripple layer of cloth 122.
Wherein, I types inhale ripple layer of cloth 121, and in the frequency range of 2~18GHz, electromagnetic parameter is in variable condition, when
When frequency is 2GHz, the dielectric constant that I types inhale ripple layer of cloth 121 is 5~10；Dielectric loss is 0.3~0.6；Magnetic conductivity for 2.0~
2.5；Magnetic loss rate is 0.5~1.0, and more preferably, the electromagnetic parameter that I types inhale ripple layer of cloth 121 is as shown in Figure 4.
II types inhale ripple layer of cloth 122, and in the frequency range of 2~18GHz, electromagnetic parameter is in variable condition, works as frequency
For 2GHz when, the dielectric constant that II types inhale ripple layer of cloth 122 is 50~60；Dielectric loss is 2~4；Magnetic conductivity is 2.6~3.0；Magnetic
Loss rate is 1.0~1.5.More preferred, the electromagnetic parameter that II types inhale ripple layer of cloth 122 is as shown in Figure 5.
This can be effectively improved gently by introducing magnetically lossy layer (inhaling ripple layer of cloth) in electrical loss layer (selecting metamaterial layer frequently)
The low frequency wave-absorbing effect of matter broadband electromagnetical absorbing material；According to impedance transition mechanism principle, first I types inhale ripple layer of cloth, and II types inhale ripple cloth again
Layer is more advantageous to inhaling the broadening of wave frequency band.
Further, fiberglass cloth 110, size is consistent with inhaling ripple layer of cloth 120, is fine by four-layer glass
Wei Bu stacks to be formed successively, and the dielectric constant of the fiberglass cloth 110 formed is 2.5~3.5 or is 2.7~3.3,
It is either 2.9~3.1 or is 3；It 0.02~0.04 is either 0.023~0.037 or be 0.027 that dielectric loss, which is ,~
0.032 or for 0.03.
Further, as shown in figure 3, this lightweight broad-band electromagnetic-wave absorbent 100 is followed successively by glass fibre from the bottom to top
Layer of cloth 110, epoxy jelly membrane 140, I types inhale ripple layer of cloth 121, epoxy jelly membrane 140, II types and inhale ripple layer of cloth 122, epoxy jelly membrane 140, lead
Electric layer of cloth 130.The overall thickness of this lightweight broad-band electromagnetic-wave absorbent 100 is H5, is 3.7~4.5mm, wherein, glass fibers
The thickness of layer of cloth 110 is tieed up as H1, is 0.9~1.0mm；I types inhale the thickness of ripple layer of cloth 121 for H2, are 0.18~0.25mm；
II types inhale the thickness of ripple layer of cloth 122 for H3, are 0.21~0.29mm；The thickness of conductive layer of cloth 130 be H4, be 0.03~
0.07mm。
Present embodiment also provides a kind of preparation method of above-mentioned lightweight broad-band electromagnetic-wave absorbent 100, including：
Step S1:The conductive fabric of different electrical conductivity is engraved as to " returning " the character form structure unit 131 of multiple repeated arrangements, then
The conductive fabric carved is stacked, forms conductive layer of cloth 130；
Step S2:I types antiradar coatings and II types antiradar coatings are layed on glass fabric respectively, I types is obtained and inhales ripple
Layer of cloth 121 and II types inhale ripple layer of cloth 122, then between epoxy jelly membrane are added to cure to obtain suction ripple layer of cloth 120；
Step S3:Glass fabric, suction ripple layer of cloth 120 and conductive layer of cloth 130 are cured with epoxy jelly membrane successively.
The feature and performance of the present invention are described in further detail with reference to embodiments：
Embodiment 1
The present embodiment provides a kind of lightweight broad-band electromagnetic-wave absorbents, and as shown in FIG. 1 to 3, structure size is as follows：
In each structural unit 131, fiberglass cloth 110 and 120 length of side of suction ripple layer of cloth are A=4.2mm；Side's annular
The length of side of first conductive part 132 is B=3.7mm, width D=0.2mm；The length of side of the second square conductive part 133 is C=
3mm；Gap between first conductive part 132 and the second conductive part 133 is E=0.2.
The overall thickness of the lightweight broad-band electromagnetic-wave absorbent is H5=4mm, wherein, the thickness of fiberglass cloth 110 is
H1=0.95mm；The thickness that I types inhale ripple layer of cloth 121 is H2=0.23mm；The thickness that II types inhale ripple layer of cloth 122 is H3=
0.25mm；The thickness of conductive layer of cloth 130 is H4=0.05mm.
Its preparation method includes：
A., the conductive fabric of four layers of different electrical conductivity is engraved as to " returning " font of an equal amount of multiple repeated arrangements respectively
Structural unit 131, then the conductive fabric carved is stacked forms conductive layer of cloth 130, wherein, four layers of conductive fabric are by under upper
Electrical conductivity is followed successively by 160Siemens/m, 100Siemens/m, 700Siemens/m, 1500Siemens/m.
B. I types antiradar coatings and II types antiradar coatings are layed on glass fabric respectively, obtain I types and inhale ripple layer of cloth
121 and II types inhale ripple layer of cloth 122, then between I types inhale ripple layer of cloth 121 and II types inhale ripple layer of cloth 122 epoxy jelly membrane are added to cure
To suction ripple layer of cloth 120；
C. successively by glass fabric, inhale ripple layer of cloth 120 and conductive layer of cloth 130 epoxy jelly membrane cure to get.
Experiment shows the lightweight broad-band electromagnetic-wave absorbent that the present embodiment obtains, in vertical incidence TE or TM ripple,
There is most strong absworption peak in 5.2GHz, peak intensity reaches -18dB, and it is 4GHz~18GHz that -10dB, which inhales wave frequency section,.
Embodiment 2
The present embodiment provides a kind of lightweight broad-band electromagnetic-wave absorbents, and as shown in FIG. 1 to 3, structure size is as follows：
In each structural unit 131, fiberglass cloth 110 and 120 length of side of suction ripple layer of cloth are A=4.2mm；Side's annular
The length of side of first conductive part 132 is B=3.7mm, width D=0.2mm；The length of side of the second square conductive part 133 is C=
3mm；Gap between first conductive part 132 and the second conductive part 133 is E=0.2.
The overall thickness of the lightweight broad-band electromagnetic-wave absorbent is H5=4mm, wherein, the thickness of fiberglass cloth 110 is
H1=0.95mm；The thickness that I types inhale ripple layer of cloth 121 is H2=0.20mm；The thickness that II types inhale ripple layer of cloth 122 is H3=
0.25mm；The thickness of conductive layer of cloth 130 is H4=0.05mm.
Its preparation method is consistent with embodiment 1, the difference is that：
Experiment shows the lightweight broad-band electromagnetic-wave absorbent that the present embodiment obtains, in vertical incidence TE or TM ripple,
There is most strong absworption peak in 4.1GHz and 16GHZ, it is 2.8GHz~18GHz that -5dB, which inhales wave frequency section,.
Embodiment 3
The present embodiment provides a kind of lightweight broad-band electromagnetic-wave absorbents, and as shown in FIG. 1 to 3, structure size is as follows：
In each structural unit 131, fiberglass cloth 110 and 120 length of side of suction ripple layer of cloth are A=4.2mm；Side's annular
The length of side of first conductive part 132 is B=3.7mm, width D=0.2mm；The length of side of the second square conductive part 133 is C=
2.5mm, the gap between the first conductive part 132 and the second conductive part 133 are E=0.2.
The overall thickness of the lightweight broad-band electromagnetic-wave absorbent is H5=4mm, wherein, the thickness of fiberglass cloth 110 is
H1=0.95mm；The thickness that I types inhale ripple layer of cloth 121 is H2=0.21mm；The thickness that II types inhale ripple layer of cloth 122 is H3=
0.25mm；The thickness of conductive layer of cloth 130 is H4=0.05mm.
Its preparation method is consistent with embodiment 1, the difference is that：
Experiment shows the lightweight broad-band electromagnetic-wave absorbent that the present embodiment obtains, in vertical incidence TE or TM ripple,
There is most strong absworption peak in 5.4GHz, peak intensity reaches -17dB, and it is 4.5GHz~18GHz that -10dB, which inhales wave frequency section,.
Embodiment 4
The present embodiment provides a kind of lightweight broad-band electromagnetic-wave absorbents, and as shown in FIG. 1 to 3, structure size is as follows：
In each structural unit 131, fiberglass cloth 110 and 120 length of side of suction ripple layer of cloth are A=4.5mm；Side's annular
The length of side of first conductive part 132 is B=4.5mm, width D=0.35mm；The length of side of the second square conductive part 133 is C=
3.5mm, the gap between the first conductive part 132 and the second conductive part 133 are E=0.22.
The overall thickness of the lightweight broad-band electromagnetic-wave absorbent is H5=3.7mm, wherein, the thickness of fiberglass cloth 110
For H1=0.9mm；The thickness that I types inhale ripple layer of cloth 121 is H2=0.18mm；The thickness that II types inhale ripple layer of cloth 122 is H3=
0.29mm；The thickness of conductive layer of cloth 130 is H4=0.07mm.
Its preparation method is consistent with embodiment 1, the difference is that：
Four layers of conductive fabric are followed successively by 150Siemens/m, 90Siemens/m, 800Siemens/ by the electrical conductivity under upper
m、1600Siemens/m。
Experiment shows the lightweight broad-band electromagnetic-wave absorbent that the present embodiment obtains, in vertical incidence TE or TM ripple,
There is most strong absworption peak in 4.5GHz, peak intensity reaches -18dB, and it is 2.4GHz~18GHz that -5dB, which inhales wave frequency section,.
Embodiment 5
The present embodiment provides a kind of lightweight broad-band electromagnetic-wave absorbents, and as shown in FIG. 1 to 3, structure size is as follows：
In each structural unit 131, fiberglass cloth 110 and 120 length of side of suction ripple layer of cloth are A=4.0mm；Side's annular
The length of side of first conductive part 132 is B=3.5mm, width D=0.25mm；The length of side of the second square conductive part 133 is C=
2.5mm, the gap between the first conductive part 132 and the second conductive part 133 are E=0.18.
The overall thickness of the lightweight broad-band electromagnetic-wave absorbent is H5=4.5mm, wherein, the thickness of fiberglass cloth 110
For H1=1.0mm；The thickness that I types inhale ripple layer of cloth 121 is H2=0.25mm；The thickness that II types inhale ripple layer of cloth 122 is H3=
0.21mm；The thickness of conductive layer of cloth 130 is H4=0.07mm.
Its preparation method is consistent with embodiment 1, the difference is that：
Four layers of conductive fabric are followed successively by 170Siemens/m, 110Siemens/m, 600Siemens/ by the electrical conductivity under upper
m、1400Siemens/m。
Experiment shows the lightweight broad-band electromagnetic-wave absorbent that the present embodiment obtains, in vertical incidence TE or TM ripple,
There is most strong absworption peak in 3.6GHz, peak intensity reaches -17dB, and it is 3.6GHz~18GHz that -10dB, which inhales wave frequency section,.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of lightweight broad-band electromagnetic-wave absorbent, which is characterized in that it includes using the cured glass fibre of epoxy jelly membrane successively
Layer of cloth inhales ripple layer of cloth and conductive layer of cloth, and the conduction layer of cloth has multiple repeated arrangements and by the first conductive part and the second conduction
" returning " character form structure unit of portion's composition.
2. lightweight broad-band electromagnetic-wave absorbent according to claim 1, which is characterized in that first conductive part is described
The frame of structural unit, second conductive part are the kernel of the structural unit, and first conductive part is led with described second
It does not contact with each other between electric portion.
3. lightweight broad-band electromagnetic-wave absorbent according to claim 1, which is characterized in that first conductive part it is transversal
Face is side's annular, and the length of side of first conductive part is 3.5~4.5mm, and width is 0.25~0.35mm；Second conductive part
Cross section be square, the length of side of second conductive part is 2.5~3.5mm.
4. lightweight broad-band electromagnetic-wave absorbent according to claim 1, which is characterized in that the conduction layer of cloth includes four layers
The frequency stacked successively selects metamaterial layer, and four layers of frequency select metamaterial layer in the electrical conductivity on the direction of the suction ripple layer of cloth
It is followed successively by 150~170Siemens/m, 90~110Siemens/m, 600~800Siemens/m, 1400~1600Siemens/
m。
5. lightweight broad-band electromagnetic-wave absorbent according to claim 1, which is characterized in that the suction ripple layer of cloth is included in far
The I types stacked successively on direction from the fiberglass cloth inhale ripple layer of cloth and II types inhale ripple layer of cloth.
6. lightweight broad-band electromagnetic-wave absorbent according to claim 5, which is characterized in that the I types inhale ripple layer of cloth in frequency
When rate is 2GHz, the dielectric constant that I types inhale ripple layer of cloth is 5~10, and dielectric loss is 0.3~0.6, and magnetic conductivity is 2.0~2.5,
Magnetic loss rate is 0.5~1.0.
7. lightweight broad-band electromagnetic-wave absorbent according to claim 5, which is characterized in that the II types inhale ripple layer of cloth in frequency
When rate is 2GHz, the dielectric constant that II types inhale ripple layer of cloth is 50~60, and dielectric loss is 2~4, and magnetic conductivity is 2.6~3.0, magnetic
Loss rate is 1.0~1.5.
8. lightweight broad-band electromagnetic-wave absorbent according to claim 5, which is characterized in that the lightweight broad-band electromagnetic wave absorption
The overall thickness of material is 3.5~4.5mm, and the thickness of the glass fabric is 0.9~1.0mm, and the I types inhale ripple ply gage
For 0.19~0.23mm, it is 0.23~0.27mm that the II types, which inhale ripple ply gage, the conduction ply gage for 0.03~
0.07mm。
9. lightweight broad-band electromagnetic-wave absorbent according to claim 1, which is characterized in that Jie of the fiberglass cloth
Electric constant is 2.5~3.5, and dielectric loss is 0.02~0.04.
10. a kind of preparation method of such as claim 1~9 any one of them lightweight broad-band electromagnetic-wave absorbent, feature exist
In, including：
The conductive fabric of different electrical conductivity is engraved as to " returning " character form structure unit of multiple repeated arrangements, then described in having carved
Conductive fabric stacks, and forms conductive layer of cloth；
I types antiradar coatings and II types antiradar coatings are layed on glass fabric respectively, I types is obtained and inhales ripple layer of cloth and the suction of II types
Ripple layer of cloth, then between the I types inhale ripple layer of cloth and the II types inhale ripple layer of cloth epoxy jelly membrane is added to cure to obtain suction ripple layer of cloth；
Glass fabric, the suction ripple layer of cloth and the conductive layer of cloth epoxy jelly membrane are cured successively.
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