CN110534908A - A kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band - Google Patents
A kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band Download PDFInfo
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- CN110534908A CN110534908A CN201910784016.9A CN201910784016A CN110534908A CN 110534908 A CN110534908 A CN 110534908A CN 201910784016 A CN201910784016 A CN 201910784016A CN 110534908 A CN110534908 A CN 110534908A
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- hollow cylinder
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- wide band
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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
Abstract
The invention discloses a kind of Meta Materials transparent microwave absorbers of composite stereo formula ultra-wide band, including several structural units, several structural units are in periodically continued distribution in two dimension, and each structural unit successively includes understructure, media layer damage and superstructure from the bottom to top；Media layer damage includes four hollow cylinder units, four hollow cylinder unit rectangular array arrangements；Each hollow cylinder unit is in the n-shaped hollow cylinder structure of rotational symmetry；The side wall of hollow cylinder structure adheres to conductive membrane layer as supporting layer, its inside；Superstructure includes frequency-selective surfaces；Understructure includes substrate layer and backsheet layer；Structural unit is made of transparent material.Wave-absorber provided by the invention solves the problems, such as that current wave-absorber cannot be considered in terms of broadband and inhale wave and high visible light transmissivity, realizes the design that novel transparent inhales wave.
Description
Technical field
The present invention relates to Meta Materials technical fields, and in particular to a kind of transparent suction wave of the Meta Materials of composite stereo formula ultra-wide band
Body.
Background technique
Meta Materials absorbing material can absorb, the incident electromagnetic wave and convert of decaying is consumed in thermal energy, Meta Materials suction
Wave body achieves very extensive application in fields such as electromagnetic compatibilities because of perfection absorption characteristic specific to it.
Some electronic electric equipments such as electronic toll collection, radio-frequency recognition system, which had both required to have electromagnetic wave, to be inhaled
Receipts ability has corresponding transmittancy to visible light again.However traditional wave-absorber is based on its inherent absorption principle, often
Its absorption band of the high material of light transmittance is narrow, and its light transmittance of the wider material of Absorber Bandwidth is not high, cannot achieve broadband
The perfection absorbed between high visible light transmissivity is compatible.A kind of vertical transparent Meta Materials provided such as patent CN105552566A
Wave-absorber can not combine broadband and inhale wave and high visible transmission although meeting corresponding microwave absorbing property and light transmission features
Rate.With the development of science and technology, in the electromagnetic-wave absorbent research of microwave regime, satisfaction " thin, light, wide, strong " is designed
Performance, simultaneously meet again visible-range have high transparency also become one new development direction of absorbing material.
Summary of the invention
The technical problems to be solved by the present invention are: conventional wave-absorber cannot be considered in terms of, wave is inhaled in broadband and high visible penetrates
The problem of rate, the present invention provides a kind of Meta Materials transparent microwave absorbers of the composite stereo formula ultra-wide band to solve the above problems, special
It Shi Yongyu not be on the visualization form of electronic toll collection.
The present invention is achieved through the following technical solutions:
A kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band, including several structural units, several structural units
It is in periodically continued distribution in two dimension, each structural unit successively includes understructure, media layer damage and upper layer from the bottom to top
Structure；
The media layer damage includes four hollow cylinder units, four hollow cylinder unit rectangular array arrangements；Each
Hollow cylinder unit is in the n-shaped hollow cylinder structure of rotational symmetry, and wherein N is even number, and N >=4；The hollow cylinder
The side wall of structure adheres to conductive membrane layer as supporting layer, its inside；
The superstructure includes frequency-selective surfaces, and the frequency-selective surfaces are covered on media layer damage upper surface；
The understructure includes substrate layer and backsheet layer, and backsheet layer is attached to the outside of substrate layer, hollow cylinder unit
It is fixed on the inside of substrate layer；
The structural unit is made of transparent material.
Further, the structural unit of the wave-absorber continuously distributed setting 20 or more on two dimension directions,
All structural unit rectangular array distributions.
Further, each structural unit be planar rotated by 90 ° along its geometric center point, 180 °, 270 °, 360 °
When can be completely coincident.
Further, the axial angle with substrate layer plate face of the hollow cylinder unit is 90 °, and the hollow cylinder knot
Structure uses cube, honeycomb prism or cylindrical structure.
Further, between the adjacent hollow cylinder unit in same plane between be divided into w, and meet 0.8 λ >=w >=0.1
λ；The λ refers to the minimal wave length λ for inhaling wave frequency sectionmin。
Further, the hollow cylinder unit is L, the λ of 1.2 λ >=L >=0.6 in the full-size of E field polarization direction；In
The height of void column body unit is h, the λ of 1.5 λ >=h >=0.6；The λ refers to the minimal wave length λ for inhaling wave frequency sectionmin。
Further, the frequency-selective surfaces are strip annular transparent conductive strips, in each structural unit, strip ring
Shape electrically conducting transparent band is adhered on four hollow cylinder unit upper surfaces, and strip annular transparent conductive strips are circumferentially adjacent two
It is disconnected at a hollow cylinder unit interval；Gap opened gap width is g, meets g greater than zero and is less than or equal to corresponding position
Two neighboring hollow cylinder unit interval size.
Further, the shape of the strip annular transparent conductive strips is the cyclic structure with centre symmetry.
Further, the thickness of the backsheet layer are as follows: g1=0.001 λ；The substrate layer with a thickness of d=0.01 λ, institute
It states λ and refers to the minimal wave length λ for inhaling wave frequency sectionmin。
Further, the substrate layer and supporting layer use transparent inorganic material；The backsheet layer and conductive membrane layer are adopted
With transparent conductive film, transparent conductive film shape uses continuous conduction film, and its conductivity is 102S/m~105S/m。
The present invention has the advantage that and the utility model has the advantages that
1, wave-absorber provided by the invention expands low frequency using frequency-selective surfaces and inhales wave, using including hollow cylinder unit
Middle layer realize broadband inhale wave.The wave-absorber has good ultra-wide band microwave absorbing property while having low frequency absorption characteristic,
Its Absorber Bandwidth range can be in 2.5GHz~50GHz, and the absorptivity in the frequency range is up to 90% or more, relative bandwidth
It can reach 181%, realize the full microwave absorbing property in radar frequency band；Wave-absorber provided by the invention also has both good light transmission
Rate, its light transmittance is up to 78% or more within the scope of wavelength 430nm~800nm；
2, wave-absorber provided by the invention, any structural unit of wave-absorber can be along its central points in xoy plane
Be rotated by 90 °, 180 °, 270 °, 360 ° when can be completely coincident, this design can be realized in interested frequency range have it is good
The insensitive microwave absorbing property of good polarization.By taking xoy plane as an example, the E field polarization direction E → and x-axis angle (Phi) of electromagnetic wave
When variation, wave-absorber is basically unchanged the absorption characteristic of H mode and transverse magnetic wave, i.e., the wave-absorber has polarization insensitive
Microwave absorbing property；
3, generally a kind of hollow cylinder with depth height of wave-absorber provided by the invention, by taking yoz plane as an example, when
When the direction of propagation k of wave → incident within the scope of 0~60 ° with the angle of z-axis, wave-absorber basic to the absorption curve of electromagnetic wave one
It causes, that is, the wave-absorber has the absorbing property of incoming wave broad-angle-incident.
In conclusion the Meta Materials transparent microwave absorber that composite stereo formula ultra-wide band provided by the invention polarizes insensitive, solution
Current wave-absorber of having determined cannot be considered in terms of the problem of wave and high visible light transmissivity are inhaled in broadband, be different from traditional absorbing material (electricity
Loss, magnetic loss, dielectric loss profile material) microwave absorbing property, present case not only has good electromagnetic absorption characteristic, simultaneously also
Have good light transmission features；Wave-absorber provided by the invention is especially suitable for the visualization view in electronic toll collection
On window.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the Array Model of composite stereo formula wave-absorber of the invention；
Fig. 2 is a structural unit schematic diagram of composite stereo formula wave-absorber of the invention；
Fig. 3 is the suction wave profile of composite wave-absorbing body of the invention；
Fig. 4 is the absorptivity of composite stereo formula wave-absorber of the invention with different polarisation angles Phi incidence change curves；
Fig. 5 is the absorptivity of composite stereo formula wave-absorber of the invention with incidence angles degree theta change curve；
Fig. 6 is the light transmittance curve of composite wave-absorbing body of the invention.
Label and corresponding parts title in attached drawing: 1- structural unit, 11- hollow cylinder unit, 111- supporting layer,
112- conductive membrane layer, 12- substrate layer, 13- backsheet layer, 14- frequency-selective surfaces.
Parameter definition in attached drawing:
Wherein p is defined as the size of structural unit；
Wherein L is defined as hollow cylinder unit in the full-size of E field polarization direction；
Wherein h is defined as the height of hollow cylinder unit；
Wherein w is defined as the gap between the adjacent hollow cylinder unit in same plane；
Wherein d is defined as the thickness of substrate layer；
Wherein g is positioned as the gap width of strip frequency-selective surfaces incision position.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1
The present invention provides a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band, including multiple structural units 1, more
A structural unit 1 is in periodically continued distribution in two dimension.Each structural unit 1 from the bottom to top successively include understructure, in
Layer structure and superstructure；Media layer damage includes four hollow cylinder units 11, four 11 rectangular arrays of hollow cylinder unit
Arrangement；Each hollow cylinder unit 11 is in the n-shaped hollow cylinder structure of rotational symmetry, for certain depth height
Column structure, wherein N is even number, and N >=4；The side wall of the hollow cylinder structure is led as supporting layer 111, its inside attachment
Thin film layer 112；Superstructure includes frequency-selective surfaces 14, and the frequency-selective surfaces 14 are covered on table on media layer damage
Face；Understructure includes substrate layer 12 and backsheet layer 13, and backsheet layer 13 is attached to the outside of substrate layer 12, hollow cylinder unit 11
It is fixed on 12 inside of substrate layer.Each structural unit 1 is made of transparent material.
In conclusion entire wave-absorber structure are as follows: backsheet layer 13 is fitted in the outside of substrate layer 12, and void column body unit 11
In the inside of substrate layer 12 (reflection side of wave), frequency-selective surfaces layer 14 is generally adhered on media layer damage, is located at for support
Top layer.
Embodiment 2
The present invention provides a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band, on the basis of embodiment 1 into
One step is improved, the structural unit 1 of the wave-absorber continuously distributed setting 20 or more on two dimension directions, all structures
The distribution of unit rectangular array.Each structural unit be planar rotated by 90 ° along its geometric center point, 180 °, 270 °,
It can be completely coincident at 360 °.Each part is specific as follows:
(1) hollow cylinder unit: the axial angle with 12 plate face of substrate layer of hollow cylinder unit 11 is 90 °, and hollow posts
Body structure uses cube, honeycomb prism or cylindrical structure.
It is divided into w between adjacent hollow cylinder unit 11 in same plane, and meets the λ of 0.8 λ >=w >=0.1；It is described
Hollow cylinder unit 11 is L, the λ of 1.2 λ >=L >=0.6 in the full-size of E field polarization direction；The height of hollow cylinder unit 11
For h, the λ of 1.5 λ >=h >=0.6；The λ refers to the minimal wave length λ for inhaling wave frequency sectionmin。
(2) frequency-selective surfaces: frequency-selective surfaces 14 are strip annular transparent conductive strips, in each structural unit,
Strip annular transparent conductive strips are adhered on four 11 upper surfaces of hollow cylinder unit, and strip annular transparent conductive strips are along ring
It is disconnected to two neighboring 11 interval of hollow cylinder unit；The shape of strip annular transparent conductive strips is with centre symmetry
Cyclic structure, such as circular ring shape, positive four side annular.Above-mentioned gap opened gap width is g, meets g greater than zero and is less than or waits
In two neighboring 11 gap size of hollow cylinder unit in corresponding position.
(3) thickness of backsheet layer 13 are as follows: g1=0.001 λ；The substrate layer 12 with a thickness of d=0.01 λ.
Finally, substrate layer 12 and supporting layer 111 use transparent inorganic material；The backsheet layer 13 and conductive membrane layer 112
Using transparent conductive film, transparent conductive film shape uses continuous conduction film, as etching is sheet, ring-type other decorative patterns
Thin film shape；And its conductivity is 102S/m~105S/m。
Research typical L S C X Ku wave band setting inhale wave frequency section: fmin~fmax, corresponding electromagnetic wavelength: λmin~
λmax, it is the inner link of preferably research wave-absorber physical size and various resonance wavelengths, generally, according in radar frequency band
Interior shortest electromagnetic wavelength defines design wave-absorber.Therefore, λ mentioned in the present invention generally refers to minimal wave length λmin。
Embodiment 3
The present invention provides a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band, on the basis of embodiment 1 into
One step is improved, and present case minimal wave length λ is 6mm, wherein the design of each modular construction is as follows:
The size p=4 λ of structural unit；
Full-size L=1.4 λ of the hollow cylinder unit in E field polarization direction；
The height h=2 λ of hollow cylinder unit；
The gap w=0.67 λ between adjacent hollow cylinder unit in same plane；
Supporting layer with a thickness of g3=0.001 λ；
Conductive membrane layer with a thickness of g0=0.0016 λ；
The gap width g=0.017 λ of strip frequency-selective surfaces incision position；
The thickness g of frequency-selective surfaces2=0.0016 λ；
Backsheet layer thickness g1=0.001 λ；
The thickness d of substrate layer=0.01 λ.
Wherein, frequency-selective surfaces layer, backsheet layer and conductive membrane layer are chosen for ITO resistance film, and conductivity is
103S/m；Wherein supporting layer and substrate layer material are unorganic glass, relative dielectric constant ε=3* (1-j0.03)).
The wave-absorber that embodiment 3 provides is tested for the property, test result is as follows:
1, wave and high light transmittance properties are inhaled in broadband
(1) wide to inhale wave frequency section:
From wave-absorber curve graph 3 as can be seen that the wave-absorber that embodiment 3 provides absorbs in 2.5GHz~50GHz frequency range
Rate A is 90% or more；And the wave-absorber that embodiment 3 provides has multiple resonance peaks in medium-high frequency, so that wave-absorber is in higher frequency band
With good strong microwave absorbing property, such as absorptivity at 17.9GHz, 28.8GHz, 38.9GHz tri- reaches 99% or more.
A=1- | S11|2-|S21|2
Wherein S11For reflection coefficient, S21The transmission coefficient of port 2 is arrived for port 1.
(2) visible light transmittance rate:
From light transmittance curve Fig. 6 of wave-absorber, it can be seen that within the scope of wavelength 430nm~800nm, embodiment 3 is provided
Wave-absorber light transmittance up to 80% or more, there is good visible light transmittance.
2, the absorbing property for the insensitivity and incoming wave broad-angle-incident of polarizing
Hollow cylinder unit design provided by the invention can ensure that wave-absorber is realized in interested frequency range with good
The absorbing property of good polarization insensitivity and incoming wave broad-angle-incident.
(1) for xoy plane, electromagnetic wave is incident with different polarisation angles, i.e. the E field polarization direction of electromagnetic wave
When incident in the case where different angle with x-axis or y-axis angle, the absorption characteristic of wave-absorber is basically unchanged.The wave-absorber has
Polarize insensitive microwave absorbing property.As shown in figure 4, the wave-absorber that embodiment 3 provides, in the frequency range of 2.5GHz~50GHz
Interior, electromagnetic wave can reach 90% or more, inhaled with 0 °, 30 °, 60 °, 90 ° of different polarisation angles incidences, the absorptivity of wave-absorber
Wave body is basically unchanged the absorption characteristic of H mode and transverse magnetic wave.
(2) generally a kind of hollow cylinder with depth height of wave-absorber provided by the invention, by taking yoz plane as an example,
The direction of propagation of waveWhen incident in the case where 0~60 ° with the angle of z-axis, wave-absorber is basic to the absorption curve of electromagnetic wave
Unanimously, that is, the wave-absorber has the absorbing property of incoming wave broad-angle-incident.If Fig. 5 can be seen that, the wave-absorber that embodiment 3 provides,
In the frequency range of 2.5GHz~50GHz, the microwave absorbing property with 0~60 ° of incoming wave wide-angle.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band, including several structural units (1), several structural units
It (1) is in periodically continued distribution in two dimension, which is characterized in that each structural unit (1) successively includes that lower layer ties from the bottom to top
Structure, media layer damage and superstructure；
The media layer damage includes four hollow cylinder units (11), four hollow cylinder unit (11) rectangular array arrangements；
Each hollow cylinder unit (11) is in the n-shaped hollow cylinder structure of rotational symmetry, and wherein N is even number, and N >=4；It is described
The side wall of hollow cylinder structure adheres to conductive membrane layer (112) as supporting layer (111), its inside；
The superstructure includes frequency-selective surfaces (14), and the frequency-selective surfaces (14) are covered on table on media layer damage
Face；
The understructure includes substrate layer (12) and backsheet layer (13), and backsheet layer (13) is attached to the outside of substrate layer (12),
Hollow cylinder unit (11) is fixed on the inside of substrate layer (12)；
The structural unit (1) is made of transparent material.
2. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that institute
The structural unit (1) of wave-absorber continuously distributed setting 20 or more on two dimension directions is stated, all structural units are in square
Shape array distribution.
3. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that every
A structural unit be planar rotated by 90 ° along its geometric center point, 180 °, 270 °, 360 ° when can be completely coincident.
4. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that institute
Stating hollow cylinder unit (11) axial direction and the angle of substrate layer (12) plate face is 90 °, and hollow cylinder structure use cube
Body, honeycomb prism or cylindrical structure.
5. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that same
It is divided into w between adjacent hollow cylinder unit (11) in one plane, and meets the λ of 0.8 λ >=w >=0.1；The λ refers to suction wave
The minimal wave length λ of frequency rangemin。
6. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band, feature exist according to claim 1 or 5
In the hollow cylinder unit (11) is L, the λ of 1.2 λ >=L >=0.6 in the full-size of E field polarization direction；Hollow cylinder unit
(11) height is h, the λ of 1.5 λ >=h >=0.6；The λ refers to the minimal wave length λ for inhaling wave frequency sectionmin。
7. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that institute
Stating frequency-selective surfaces (14) is strip annular transparent conductive strips, and in each structural unit, strip annular transparent conductive strips are viscous
It is attached on four hollow cylinder unit (11) upper surfaces, and strip annular transparent conductive strips are in circumferentially two neighboring hollow cylinder
Unit (11) interval disconnects；Gap opened gap width is g, meets g greater than zero and is less than or equal to corresponding position adjacent two
A hollow cylinder unit (11) gap size.
8. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 7, which is characterized in that institute
The shape for stating strip annular transparent conductive strips is the cyclic structure with centre symmetry.
9. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that institute
State the thickness of backsheet layer (13) are as follows: g1=0.001 λ；The substrate layer (12) refers to suction wave with a thickness of d=0.01 λ, the λ
The minimal wave length λ of frequency rangemin。
10. a kind of Meta Materials transparent microwave absorber of composite stereo formula ultra-wide band according to claim 1, which is characterized in that
The substrate layer (12) and supporting layer (111) use transparent inorganic material；The backsheet layer (13) and conductive membrane layer (112) are adopted
With transparent conductive film, transparent conductive film shape uses continuous conduction film, and its conductivity is 102S/m~105S/m。
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| CN111987400A (en) * | 2020-07-27 | 2020-11-24 | 南京航空航天大学 | Light-operated wave-absorbing active frequency selective surface |
| CN112134026A (en) * | 2020-09-25 | 2020-12-25 | 合肥工业大学 | Multi-frequency metamaterial wave absorbing body with three-dimensional structure |
| CN112563760A (en) * | 2020-12-03 | 2021-03-26 | 西安交通大学 | Butterfly-wing-imitated broadband composite wave-absorbing metamaterial structure and manufacturing method thereof |
| CN112688084A (en) * | 2020-12-17 | 2021-04-20 | 宁波大学 | Electromagnetic absorption structure with optical transparency and adjustable wave-absorbing frequency |
| CN115084869A (en) * | 2022-06-24 | 2022-09-20 | 中国人民解放军空军工程大学 | Ultra-wide band wide-angle domain stealth structure material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987400A (en) * | 2020-07-27 | 2020-11-24 | 南京航空航天大学 | Light-operated wave-absorbing active frequency selective surface |
| CN112134026A (en) * | 2020-09-25 | 2020-12-25 | 合肥工业大学 | Multi-frequency metamaterial wave absorbing body with three-dimensional structure |
| CN112134026B (en) * | 2020-09-25 | 2022-06-10 | 合肥工业大学 | Multi-frequency metamaterial wave absorber with three-dimensional structure |
| CN112563760A (en) * | 2020-12-03 | 2021-03-26 | 西安交通大学 | Butterfly-wing-imitated broadband composite wave-absorbing metamaterial structure and manufacturing method thereof |
| CN112563760B (en) * | 2020-12-03 | 2022-02-22 | 西安交通大学 | Butterfly-wing-imitated broadband composite wave-absorbing metamaterial structure and manufacturing method thereof |
| CN112688084A (en) * | 2020-12-17 | 2021-04-20 | 宁波大学 | Electromagnetic absorption structure with optical transparency and adjustable wave-absorbing frequency |
| CN112688084B (en) * | 2020-12-17 | 2023-02-14 | 宁波大学 | Electromagnetic absorption structure with optical transparency and adjustable wave-absorbing frequency |
| CN115084869A (en) * | 2022-06-24 | 2022-09-20 | 中国人民解放军空军工程大学 | Ultra-wide band wide-angle domain stealth structure material |
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