CN106356636A - Transparent broadband random surface - Google Patents
Transparent broadband random surface Download PDFInfo
- Publication number
- CN106356636A CN106356636A CN201610716104.1A CN201610716104A CN106356636A CN 106356636 A CN106356636 A CN 106356636A CN 201610716104 A CN201610716104 A CN 201610716104A CN 106356636 A CN106356636 A CN 106356636A
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- transparent
- conductive film
- film layer
- transparent conductive
- square loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
-
- 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 transparent broadband random surface, comprising multiple unit structures. The unit structure comprises the upper transparent conductive film layer, transparent substrate and lower transparent conductive film layer. The upper transparent conductive film layer is located at the upper surface of transparent substrate and the lower transparent conductive film layer is fully covered at the lower surface of transparent substrate; the upper transparent conductive film layer is the double resonance unit structure with random sizes; and the double resonance unit structure is the symmetrical structure, comprising the ring located at the center of unit structure and stub ring located at the periphery of ring. The transparent broadband random surface can realize the light transmittance >=85% within the scope of visible light, effectively shorten the RCS of target object in the X wave band with simple technology, uniform structure and transparent visible light, has excellent electromagnetic scattering properties and play an important role in such fields as invisibility of aircraft cockpit.
Description
Technical field
The present invention relates to radar invisible and novel artificial electromagnetic material, relate in particular to a kind of transparent broadband of microwave frequency bandRCS (Radar Cross Section RCS) reduces surface.
Background technology
The novel artificial electromagnetic material (Metamaterials) relating in the present invention is tied by the sub-wavelength unit of certain scaleStructure periodic arrangement composition, by its cellular construction of artificial design, can control effective dielectric constant, magnetic conductivity, the refraction of materialThe electromagnetic parameter such as rate, wave impedance, realizes the character that do not have of material that nature exists. Along with people are to novel artificial electromagnetismGoing deep into of materials theory research and application and development, it in radar invisible field particularly in military combat weapon and platform stealthyApplication has caused numerous researchers' interest.
The method of radar invisible is to adopt various means to reduce the RCS of target. Traditional RCS that reducesMethod mainly contain 3 kinds, respectively: configuration design, adopt radar absorbing (Radar Absorbing Material), haveSource offsets, passive offset etc. The reduction of RCS is a kind of compromise research, and its pluses and minuses balance each other. Be trimmed when target surface orWhen reorientation is reduced to obtain RCS, radar cross section reducing in a viewing angle is accompanied by conventionally at anotherIncrease in individual viewing angle; Use radar absorbing material, by dissipation of energy in material, just can obtain the contracting of radar cross sectionSubtract, and RCS Level hold is in the other direction relatively constant. On the other hand, the use of RAM be also increase target weight,Volume and surface maintenance problem are cost, have in actual applications many restrictions. Broadband random surface is based on random scatterTheory, utilizes many resonance structures, by the dimensional parameters of regulon structure, when electromagnetic wave is incident to metal plate, producesReflection spike is to space all directions radiation, and the back wave of space all directions presents random distribution, makes the anti-of metal platePenetrate peak value and significantly reduce, reach the object stealthy to it.
But current random surface research is confined to using polyimides as dielectric material more, designed pattern is manyAdopt the mode of metal patch to be etched on dielectric layer, more this structure is covered on metallic object, to reduce objective bodyRCS. And metal patch/polyimides/metal-layer structure is owing to cannot realizing visible transparent, in opportunity of combat cabin, passenger cabin glassSome special necks such as glass cannot meet the demands. Aircraft cockpit, as one of aircraft RCS tri-large scattering sources, is mainly derived from passenger cabin glassThe wave of glass, makes the scatter echo of engine room inside part easily be subject to radar detecting. Therefore for preventing radar detecting, must addThe Stealth Fighter of strong passenger cabin transparent member, is exactly in fact to reduce the reflection of radar signal at this position, and this problem is all the timePeople's study hotspot. Therefore, the present invention proposes a kind of transparent broadband random surface, thereby can prevent that radar wave incident cabin from subtractingLittle RCS, the dielectric material relating to is transparency carrier (glass, PET etc.), random surface and electro-magnetic screen layer all adopt electrically conducting transparentThin layer, the simple and structure one of raw materials, easy to use, can realize cabin glass transparent and cabin RCS reduction simultaneouslyTarget, broken through the multiple limitation of traditional material. This transparent, broadband, to the insensitive random surface of incident direction, compareIn traditional material not only thickness greatly reduce, and can realize visible-range transmitance >=85%, to the backward RCS of incidence waveSignificantly reduction, the resonant element being easy to by utilizing different size, different structure is realized the stealthy of metal target body, can solveOpportunity of combat cabin reflection of radar wave problem, has very large potential using value in stealthy field.
Summary of the invention
Goal of the invention: the problem existing in order to solve prior art, the Stealth Fighter of enhancing random surface, the invention providesA kind of transparent broadband random surface.
Technical scheme: the transparent broadband of one provided by the invention random surface, comprises multiple cellular constructions, described unit knotStructure comprises upper strata transparent conductive film layer, transparency carrier and lower floor's transparent conductive film layer, described upper strata transparent conductive film layerBe positioned at the upper surface of transparency carrier, the complete lower surface that covers transparency carrier of described lower floor transparent conductive film layer; On describedLayer transparent conductive film layer is the random double resonance cellular construction of size; Described double resonance cellular construction is symmetrical structure, comprisesBe positioned at the ring at cellular construction center and be positioned at the peripheral band minor matters ring of ring.
Preferably, described ring is square loop, and peripheral band minor matters ring is band minor matters square loop.
Preferably, the minor matters length of the length of side of square loop and the square loop with minor matters is random.
Preferably, the minor matters length phase of the length of side of the square loop in an elementary cell and the square loop with minor mattersDeng.
Preferably, described upper strata transparent conductive film layer and transparency carrier can be one or more layers.
Preferably, described upper strata transparent conductive film layer and lower floor's transparent conductive film layer are transparent conductive material.
Preferably, described upper strata transparent conductive film layer and lower floor's transparent conductive film layer be tin indium oxide, zinc oxide aluminum,One or more in fluorine-doped tin dioxide, tin-antiomony oxide, graphene film.
Preferably, described upper strata transparent conductive film layer is made by photoetching, laser-induced thermal etching or chemical corrosion method.
Preferably, described transparency carrier is simple glass, quartz glass, lucite and PET, PEN transparent flexible materialOne or more in material.
Preferably, described elementary cell is square, and making the length of side of elementary cell is a, and the thickness that makes transparency carrier is h,Making the square loop of double resonance cellular construction and the live width with minor matters square loop is d, makes square loop and band minor matters squareGap between ring is g, and value is as follows: a=10mm, h=4mm, g=0.5mm, d=0.5mm.
Beneficial effect: the prior art of comparing, structure one of the present invention, raw material are simple and easy to process. Transparent broadbandRandom surface structure fabrication operation is simple, only raw material need be carried out to just plastic pattern of a step photoetching or laser-induced thermal etching, processingConvenience and saving cost. The present invention has the feature to visible transparent. With respect to metal patch/polyimides/metal level knotThe random surface of structure, in actual applications, for example, in aircraft cabin RCS scattering problems, the machine cabin of should provoking battle is hidden to radar waveBody, requires again cabin glass transparent to visible light wave range, and the present invention can well satisfy the demands, and metal patch/polyamides AsiaAmine/metal-layer structure cannot meet the demands. The present invention has broadband character, and in 8～12GHz frequency range, the present invention can make twoThe backward RCS reduction of dimension target exceedes 10dB. That the present invention possesses is simultaneously portable, the easy advantage such as integrated, and be easy to conformal, than biographyThe wave-absorbing and camouflage material of system is thinner, lighter.
Brief description of the drawings
Fig. 1 a is the individual unit structure front view of transparent broadband random surface.
Fig. 1 b is the individual unit structure side view of transparent broadband random surface.
Fig. 1 c is the size marking figure of the individual unit structure of transparent broadband random surface.
Fig. 2 is that electromagnetic wave normal incidence and groined type unit are got in the situation of different size parameter l, and unit reflected phase will is with frequentlyRate be related to simulation result.
Fig. 3 is electromagnetic wave normal incidence and in the time of 10GHz, the relation of groined type unit phase place and dimensional parameters l.
Fig. 4 is the front schematic view on the stealthy surface of artificial electromagnetic, transparent broadband.
Fig. 5 is the simulation result of the stealthy surperficial normal incidence of transparent broadband artificial electromagnetic.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Referring to Fig. 1 a～1c, this transparent broadband random surface comprises multiple cellular constructions, and each cellular construction comprises upper strataTransparent conductive film layer 1, transparency carrier 2 and lower floor's transparent conductive film layer 3, described upper strata transparent conductive film layer 1 is positioned atThe upper surface of Benq's plate 2, the described lower floor transparent conductive film layer 3 complete lower surface that covers transparency carrier 2, are mainly used in preventingOnly Electromgnetically-transparent; Described upper strata transparent conductive film layer 1 is the random double resonance cellular construction of size, described double resonance unitStructure is symmetrical structure, comprises and is positioned at the ring of unit center and is positioned at the peripheral band minor matters ring of ring, and in the present embodiment, be squareRing and be positioned at the peripheral band minor matters square loop of ring, also can use other symmetrical structures, as annulus be positioned at annulus peripheryWith minor matters annulus, regular hexagon ring be positioned at band minor matters regular hexagon ring of regular hexagon periphery etc. Size refers to pros at randomThe minor matters length of the length of side of shape ring and the square loop with minor matters is random, to cause the random distribution of back wave phase place. IntuitivelySee, double resonance cellular construction is exactly a groined type double resonance cellular construction, is characterized in that double resonance structure has just reached coveringThe broadband performance of whole X-band. Emphasis of the present invention is exactly the limitation that had both broken through traditional stealth material, has again with tradition hiddenThe RCS reduction performance that stature material is comparable, and accomplish visible transparent.
Described upper strata transparent conductive film layer and transparency carrier can only be not only single layer structures, can have multi-layer transparent to leadConductive film layer, multi-layer transparent substrate.
In the present embodiment, upper strata transparent conductive film layer and lower floor's transparent conductive film layer are tin indium oxide, also can makeWith other transparent conductive materials that it may occur to persons skilled in the art that, as zinc oxide aluminum, fluorine-doped tin dioxide, tin-antiomony oxide,Graphene film etc. In the present embodiment, transparency carrier is simple glass, also can use it may occur to persons skilled in the art thatOther have the transparent medium of excellent light transmission, as quartz glass, lucite and PET, PEN transparent flexible material etc.Described upper strata transparent conductive film layer can be made by photoetching, laser-induced thermal etching or chemical corrosion method.
The upper strata transparent conductive film layer that the present embodiment proposes is by the random groined type double resonance cellular construction battle array of sizeForm similar plane reflection battle array structure. Transparent broadband random surface is the artificial electromagnetic surface based on random scatter theory. Well wordShape resonant element forms by being positioned at a regular square ring at center and being positioned at peripheral band minor matters square loop, is typicalDouble resonance construction unit, live width, interannular gap size and the transparency carrier by appropriate design upper strata transparent conductive filmThickness, makes the interior ring of groined type double resonance cellular construction and outer shroud on approaching frequency, produce resonance respectively, thereby realizes twoResonance reaches the object of widening unit bandwidth. By change the length of side of center square loop and the branch with minor matters square loop simultaneouslyJoint size, makes electromagnetic wave be random distribution in the back wave phase place on transparent conductive film surface, forms diffuse reflection, thereby reducesRCS is that the reflected phase will that each radiating element produces presents random distribution at 360 degree one-periods, by the very strong reflection in in-fieldPeak is dispersed as random, a rambling reflection peak.
As shown in Fig. 1 c, making the length of side of elementary cell is a, making the thickness of transparency carrier is h, makes double resonance cellular constructionSquare loop and live width with minor matters square loop are d, make square loop and be g with the gap between minor matters square loop,The value of embodiment is as follows: a=10mm, h=4mm, g=0.5mm, d=0.5mm. The length of side of square loop and band minor matters prosThe minor matters appearance of shape ring etc., are designated as l. L can adjust, and the resonant frequency of ring, outer shroud in Chinese character Jing-shaped unit is approached, to widen listUnit's bandwidth. Meet all values of particular phases and amplitude distribution by the characteristic of dimensionally-optimised rear elementary cell; Described phase place andAmplitude distribution refers to: in working band, reflected phase will is with frequency smooth variation; The reflected phase will class of a curve that different l are corresponding is seemingly flatRow distributes, and guarantees in whole bandwidth, to have all the time phase difference.
Fig. 2, in the time that l changes, arrives within the scope of 12GHz at 8GHz, the frequency curve almost parallel of each back wave phase place,Present a kind of pectinate texture; Under different l, S11 phase place has similar frequency response, and can meet l in maximum and minimum of a valueWhen variation, back wave phase difference has the excursion of approximate 360 °. This behavioral illustrations this random surface there is good broadbandCharacteristic.
Figure 3 shows that phase place taking 10GHz place in Fig. 2 is as benchmark, the reflection coefficient phase at this frequency simulating andThe curved line relation of patch size l. As can be seen from the figure, both are approximated to dull linear relationship. Due to reflection coefficient phase andThe relation of chip unit is broadband character, thus in the frequency range of 8GHz～12GHz, also there is similar relation, and10GHz compares only phase difference.
Fig. 4 is the front schematic view on the stealthy surface of artificial electromagnetic, transparent broadband. Can observe this embodiment and be by 16 ×Double resonance cellular construction size in 16 elementary cells composition and elementary cell differs, and its size is by the list in Fig. 3Line transfer sexual intercourse obtains, i.e. the random phase place random number that generates a group 0～360 in Matlab, according to the functional relationships in Fig. 3System is converted into size random number, is applied in paster battle array.
Fig. 5 is the RCS reduction figure of lower floor's transparent conductive film layer after this random surface of electromagnetic wave normal incidence. Result demonstration,At 8～12GHz, in the situation of single station, covered this random surface after electromagnetic wave cannot see through, under transparent conductive film layer RCSFall and exceed 10dB. This invention can replace conventional cabin glass, when the glass of radar wave incident cabin, just by diffuse reflection, can prevent radarThe cabin RCS scattering that ripple incident cabin causes increases, and what reduce to be detected by enemy may.
More than describe and explained principal character of the present invention, general principle and advantage of the present invention. The technology of the industryPersonnel should understand, and the present invention is not restricted to the described embodiments, and the just explanation of describing in above-described embodiment and description originallyThe principle of invention. Without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, for example skillArt personnel can modify so that it is operated in its all band to above-mentioned various parameters, or adopt multilayer resonance structure or manyLayer transparent medium structure is to widen bandwidth, or amendment relevant parameter is so that its properity and the present embodiment are differentDeng, these changes and improvements all fall in the claimed scope of the invention. The claimed scope of the present invention by claim andIt is equal to and defines.
Claims (10)
1. a transparent broadband random surface, is characterized in that, comprises multiple cellular constructions, and described cellular construction comprises that upper strata is saturatingBright conductive membrane layer, transparency carrier and lower floor's transparent conductive film layer, described upper strata transparent conductive film layer is positioned at transparency carrierUpper surface, the complete lower surface that covers transparency carrier of described lower floor transparent conductive film layer; Described upper strata electrically conducting transparent is thinRete is the random double resonance cellular construction of size; Described double resonance cellular construction is symmetrical structure, comprises and is positioned at cellular constructionThe ring at center and be positioned at the peripheral band minor matters ring of ring.
2. transparent broadband according to claim 1 random surface, is characterized in that, described ring is square loop, peripheralBand minor matters ring is band minor matters square loop.
3. transparent broadband according to claim 2 random surface, is characterized in that, the length of side of square loop and with minor mattersThe minor matters length of square loop is random.
4. according to the transparent broadband random surface described in claim 2 or 3, it is characterized in that, in an elementary cell justThe minor matters of the length of side of Q-RING and the square loop with minor matters are equal in length.
5. according to the transparent broadband random surface described in claim 1 or 2 or 3, it is characterized in that, described upper strata electrically conducting transparent is thinRete and transparency carrier can be one or more layers.
6. according to the transparent broadband random surface described in claim 1 or 2 or 3, it is characterized in that, described upper strata electrically conducting transparent is thinRete and lower floor's transparent conductive film layer are transparent conductive material.
7. transparent broadband according to claim 6 random surface, is characterized in that, described upper strata transparent conductive film layer withLower floor's transparent conductive film layer is one in tin indium oxide, zinc oxide aluminum, fluorine-doped tin dioxide, tin-antiomony oxide, graphene filmKind or several.
8. according to the transparent broadband random surface described in claim 1 or 2 or 3, it is characterized in that, described upper strata electrically conducting transparent is thinRete is made by photoetching, laser-induced thermal etching or chemical corrosion method.
9. according to the transparent broadband random surface described in claim 1 or 2 or 3, it is characterized in that, described transparency carrier is commonOne or more in glass, quartz glass, lucite and PET, PEN transparent flexible material.
10. according to the transparent broadband random surface described in claim 2 or 3, it is characterized in that, described elementary cell is squareShape, making the length of side of elementary cell is a, making the thickness of transparency carrier is h, makes square loop and the band minor matters of double resonance cellular constructionThe live width of square loop is d, makes square loop and is g with the gap between minor matters square loop, and value is as follows: a=10mm, h
＝4mm，g＝0.5mm，d＝0.5mm。
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| CN201610716104.1A CN106356636A (en) | 2016-08-24 | 2016-08-24 | Transparent broadband random surface |
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| CN201610716104.1A CN106356636A (en) | 2016-08-24 | 2016-08-24 | Transparent broadband random surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711681A (en) * | 2018-04-10 | 2018-10-26 | 东南大学 | A kind of difunctional Meta Materials of sound insulation microwave stealth |
| CN108767492A (en) * | 2018-04-25 | 2018-11-06 | 北京邮电大学 | Adjustable Terahertz broadband wave absorbing device |
| CN109286078A (en) * | 2018-11-26 | 2019-01-29 | 东南大学 | Null tone domain gradient Meta Materials and its design method |
| CN111900549A (en) * | 2020-08-31 | 2020-11-06 | 西安电子科技大学 | High-transparency diffuse reflection super surface based on regular hexagon distributed ring grid |
| CN112103661A (en) * | 2020-09-18 | 2020-12-18 | 中国科学院半导体研究所 | Transparent flexible broadband microwave low-scattering structure and transparent flexible skin |
| CN112622391A (en) * | 2020-11-02 | 2021-04-09 | 中国人民解放军空军工程大学 | Optical transparent ultra-wideband radar and infrared double-stealth structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711681A (en) * | 2018-04-10 | 2018-10-26 | 东南大学 | A kind of difunctional Meta Materials of sound insulation microwave stealth |
| CN108711681B (en) * | 2018-04-10 | 2020-06-30 | 东南大学 | Sound insulation microwave stealth dual-function metamaterial |
| CN108767492A (en) * | 2018-04-25 | 2018-11-06 | 北京邮电大学 | Adjustable Terahertz broadband wave absorbing device |
| CN109286078A (en) * | 2018-11-26 | 2019-01-29 | 东南大学 | Null tone domain gradient Meta Materials and its design method |
| CN111900549A (en) * | 2020-08-31 | 2020-11-06 | 西安电子科技大学 | High-transparency diffuse reflection super surface based on regular hexagon distributed ring grid |
| CN111900549B (en) * | 2020-08-31 | 2021-06-08 | 西安电子科技大学 | High-transparency diffuse reflection super surface based on regular hexagon distributed ring grid |
| CN112103661A (en) * | 2020-09-18 | 2020-12-18 | 中国科学院半导体研究所 | Transparent flexible broadband microwave low-scattering structure and transparent flexible skin |
| CN112103661B (en) * | 2020-09-18 | 2022-06-10 | 中国科学院半导体研究所 | Transparent flexible broadband microwave low-scattering structure and transparent flexible skin |
| CN112622391A (en) * | 2020-11-02 | 2021-04-09 | 中国人民解放军空军工程大学 | Optical transparent ultra-wideband radar and infrared double-stealth structure |
| CN112622391B (en) * | 2020-11-02 | 2023-01-17 | 中国人民解放军空军工程大学 | Optical transparent ultra-wideband radar and infrared double-stealth structure |
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Application publication date: 20170125 |