CN105097052A - Surface resistive type broadband meta-material absorber - Google Patents
Surface resistive type broadband meta-material absorber Download PDFInfo
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- CN105097052A CN105097052A CN201410235215.1A CN201410235215A CN105097052A CN 105097052 A CN105097052 A CN 105097052A CN 201410235215 A CN201410235215 A CN 201410235215A CN 105097052 A CN105097052 A CN 105097052A
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Abstract
The invention relates to a microwave absorber, especially to a surface resistive type broadband meta-material absorber. The microwave absorber has a three-layer structure. A bottom layer is a copper plate. An interface layer is a PMI foam (polymethacrylimide) medium. An upper layer is an indium tin oxide (ITO) film with an isotropic etching branch structure. A total omnidirectional branch unit includes eight quadrangle split ring units formed by primary branches and secondary branches and eight V-shape units formed by secondary branches. All of the split ring units are distributed in a quasi-periodic form. The lengths of the primary and secondary branches are respective a and b. The branch width is w. An included angle theta between branches is 45 degrees. When there is one branch structure, in a frequency band range of 7.80-16.90GHz, the minimum absorptivity reaches 80%, and the absorption relative band width is 73.68%. When there are two branch structures, in the frequency band range of 6.15-17.00GHz, the minimum absorptivity reaches 80%, and the absorption relative band width is 93.74%. The microwave absorber can realize the isotropy and the high performance absorption of broadband, and has advantages of simple and light structure, low cost, easy preparation and the like.
Description
Technical field the present invention relates to a kind of microwave and inhales ripple device, and particularly surface resistance molded breadth band meta-material absorber, utilizes surface resistance type dendroid metamaterial structure to make absorption band reach wideband.
Background technology is along with the develop rapidly of military new and high technology, inhale ripple device and effectively can reduce target radar scattering cross-section RCS and increasing in the effect in following stealth technology field because of it, traditional suction ripple device does not meet the requirement of radar-wave absorbing body " thin, light, wide, strong ", and Meta Materials suction ripple device is paid close attention to because of it widely in the great potential in stealthy field and applies.
Meta Materials is a kind of made periodic dielectric or metal array, and the microstructure of Meta Materials is much smaller than its operation wavelength, the resonance absorbing feature that Meta Materials suction ripple device itself has shows wide application prospect in field of microwave absorption, different geometries needs specific electromagnetic polarization mode, and the frequency range of resonance is very narrow, this limits the practical application of meta-material absorber to a certain extent.Ripple device is inhaled in the low section Meta Materials perfection of people's designs such as Landy in 2008, can electromagnetic wave absorption completely within the scope of certain microwave frequency band, after this people devise the different Meta Materials suction ripple device of various different operating frequency range, but these absorbers generally have, and absorption band is narrow, assimilation effect is poor, section is thick, to shortcomings such as electromagnetic polarization mode sensitivities.The shortcomings of ripple device is inhaled for Meta Materials, the present invention realizes the covering X-band of a kind of individual layer of method design that broadband absorbs by a kind of surface resistance type isotropy dendritic structure Meta Materials and the isotropic broadband metamaterial of Ku wave band inhales ripple device, this absorber have simple and light, absorption band is wide, absorptivity is high, thin profile, to the insensitive advantage of electromagnetic polarization mode.
Summary of the invention the object of this invention is to provide a kind of isotropy broadband metamaterial and inhales ripple device, makes suction ripple device absorption band reach wideband by surface resistance type metamaterial structure.This meta-material absorber bottom is metal copper plate, middle layer is PMI foam (Polymethacrylimide) medium, upper strata is at one or more isotropy dendritic structures of the upper etching of ito thin film (tin-doped indium oxide), and realizing intercoupling of dendritic structure at different levels by regulating and controlling the size of dendritic structure, making the absorptivity of suction ripple device and broad absorption band is wide reaches optimum.Isotropy broadband metamaterial is become by the structure fabrication of design to inhale ripple device, in microwave dark room, the absorbing property of ripple device is inhaled in test, the absorptivity of minimum 80% can be reached when there being a kind of dendritic structure in 7.80-16.90GHz band limits, absorbing relative bandwidth 73.68%.The absorptivity of minimum 80% can be reached when there being two kinds of dendritic structures in 6.15-17.00GHz band limits, absorbing relative bandwidth 93.74%.Suction ripple device of the present invention only just can realize isotropy by three layers of simple structure and wide band high-performance absorbs, advantages such as having simple, the low section of structure, thickness is thin, cost is low, easy to prepare, not fragile, absorbing property is good.
Accompanying drawing explanation
Fig. 1 dendritic structure schematic diagram
Fig. 2 dendritic structure cell schematics
Fig. 3 embodiment one Meta Materials inhales ripple device sample schematic diagram
Fig. 4 embodiment one Meta Materials inhales ripple device absorptive character test result
Fig. 5 embodiment two Meta Materials inhales ripple device minimum period structural representation
Fig. 6 embodiment two Meta Materials inhales ripple device sample schematic diagram
Fig. 7 embodiment two meta-material absorber absorptive character test result
Embodiment adopts ITO laser etching techniques to make and covers X-band and Ku wave band isotropy broadband Meta Materials suction ripple device, first a kind of surface resistance type dendritic structure unit is designed, structural model figure as depicted in figs. 1 and 2, the whole omnidirectional branch unit of upper strata etching comprises eight four-sided openings rings be made up of firsts and seconds branch and eight V-arrangements be made up of secondary branch, and all split ring unit are with formal distribution quasi-periodicity.One-level, secondary branch length are respectively a, b, and branch width is w, and between branch, angle is θ=45 °, and structural unit is rotational symmetric by 45 ° with central axial direction.Basic structural unit assembled arrangement is become periodic structure and suction ripple device by being processed into rectangle, laser etching techniques is adopted to prepare complete absorber, in surface resistance value be 40 Ω ito thin film on etch the dendritic structure 2 designed, intermediate medium substrate to be specific inductive capacity be 1.2 PMI foam (Polymethacrylimide), its bottom surface is copper ground plate, its geometric size is identical with the size of foam medium substrate, and final design is processed as and covers X-band and Ku wave band isotropy broadband Meta Materials suction ripple device.Employ two kinds of wide band Meta Materials in the embodiment of the present invention and inhale ripple device.
Implementation procedure of the present invention and material property are illustrated by embodiment and accompanying drawing:
Embodiment one:
Adopt laser etching techniques, ito thin film etches size identical and in the dendritic structure unit of periodic arrangement, often kind of dendritic structure by secondary branch symmetrical rotary composition, angle theta=45 ° between branch, branch live width w=1.2mm, the length of side 1=10mm of medium substrate in each cycle.The unit arrangement of meta-material absorber as shown in Figure 2, dendritic structure material is film surface one deck conductive tin-doped indium oxide, its one-level branch length is 1.8mm, secondary branch length is 2.6mm, middle PMI foam medium (Polymethacrylimide) substrate thickness is 3mm, and bottom copper plate thickness is 2mm.Final cycle dendritic structure meta-material absorber size is 440mm × 480mm.The Meta Materials of final making inhales ripple device as shown in Figure 3.For the absorber of this geometric parameter, its more than 80% absorptivity working band is 7.80GHz-16.90GHz (Absorber Bandwidth is 9.10GHz).Fig. 4 is that embodiment of the present invention Meta Materials inhales ripple device to the absorptive character of microwave.
Embodiment two:
Adopt laser etching techniques, ito thin film etch two kinds of different sizes and in the dendritic structure unit of periodic arrangement, often kind of dendritic structure by secondary branch symmetrical rotary composition, angle theta=45 ° between branch.The one-level of the first dendritic structure T1, secondary branch length a1=5.0mm, b=6.5mm respectively, branch live width w=2.0mm, the one-level of the second dendritic structure T2, secondary branch length a1=10mm respectively, b=12mm, branch live width w=7mm, minimum period unit arrangement as shown in Figure 5.Wherein the thickness of PMI foam (Polymethacrylimide) medium substrate is 3mm, the complete cladding thickness in its bottom surface is the metal copper plate of 2mm, become Meta Materials by three-decker combination making and inhale ripple device, its physical dimension is 440mm × 480mm, and the final Meta Materials made inhales ripple device as shown in Figure 6.For the absorber of this geometric parameter, its more than 80% absorptivity working band is 6.15-17.00GHz (Absorber Bandwidth is 10.85GHz).Fig. 7 is that embodiment of the present invention Meta Materials inhales ripple device to the absorptive character of microwave.
The foregoing is only the preferred embodiments of the present invention, when not limiting scope of the invention process with this, namely the simple equivalence generally done according to the claims in the present invention and description of the invention content changes and modifies, and all should still belong in the scope of patent of the present invention covering.
Claims (4)
1. surface resistance molded breadth band meta-material absorber, this absorber composition comprises metal copper plate, PMI foam (Polymethacrylimide) medium, is carved with the ITO conductive film of branch pattern; Its principal character is: the array etching one or more branch units composition on ITO conductive film, by changing the physical dimension of branch unit, makes this meta-material absorber be operated in X and Ku wave band.
2. surface resistance molded breadth band Meta Materials inhales ripple device as claimed in claim 1, it is characterized in that being made up of a kind of branch of size when inhaling ripple device minimum period structural unit, one-level dendritic structure length is between 1.5mm to 2.5mm, secondary dendritic structure length is between 2.0mm to 3.0mm, dendritic structure width is between 0.8mm to 1.6mm, the minimal structure unit length of side is 8mm to 12mm, and the frequency band of absorptivity more than 80% regulates between 7.80 to 16.90GHz; When the ripple device minimum period, structural unit was made up of the branch of two kinds of sizes in suction, get branch one-level dendritic structure length between 5mm to 10mm, secondary dendritic structure length is 6.5 to 12mm, dendritic structure width is 2.0mm to 7mm, the minimal structure unit length of side is 25mm to 50mm, and the frequency band of absorptivity more than 80% regulates between 6.15 to 17.00GHz.
3. surface resistance molded breadth band Meta Materials as claimed in claim 1 inhales ripple device, it is characterized in that appearing resistor-type branch at ITO conductive film top layer laser ablation, and ITO conductive film surface resistance is 40 Ω.
4. surface resistance molded breadth band Meta Materials as claimed in claim 1 inhales ripple device, and it is characterized in that intermediate medium substrate is PMI foam (Polymethacrylimide), its thickness is 3mm, and specific inductive capacity is 1.2.
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| CN106058482A (en) * | 2016-06-12 | 2016-10-26 | 西安电子科技大学 | Double-layer conductive thin film-based transparent broadband electromagnetic wave absorber |
| CN106572622A (en) * | 2016-11-02 | 2017-04-19 | 国家纳米科学中心 | Broadband wave absorber and preparation method |
| CN109888506A (en) * | 2019-01-04 | 2019-06-14 | 西安理工大学 | A kind of adjustable Terahertz of frequency mostly band absorber |
| CN109921192A (en) * | 2019-03-06 | 2019-06-21 | 西安电子科技大学 | A kind of low frequency wave transparent high-frequency wideband inhales the frequency screening device of wave |
| CN112838377A (en) * | 2020-12-31 | 2021-05-25 | 南京航空航天大学 | Super structure-based multiband THz wave absorber |
| CN113381200A (en) * | 2021-05-13 | 2021-09-10 | 宁波大学 | Electromagnetic absorption structure with wide incident angle |
| CN117559141A (en) * | 2023-11-01 | 2024-02-13 | 广东技术师范大学 | Transparent broadband metamaterial wave absorber based on topological optimization and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106058482A (en) * | 2016-06-12 | 2016-10-26 | 西安电子科技大学 | Double-layer conductive thin film-based transparent broadband electromagnetic wave absorber |
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| CN109888506A (en) * | 2019-01-04 | 2019-06-14 | 西安理工大学 | A kind of adjustable Terahertz of frequency mostly band absorber |
| CN109888506B (en) * | 2019-01-04 | 2020-12-22 | 西安理工大学 | Frequency-adjustable terahertz multi-band absorber |
| CN109921192A (en) * | 2019-03-06 | 2019-06-21 | 西安电子科技大学 | A kind of low frequency wave transparent high-frequency wideband inhales the frequency screening device of wave |
| CN112838377A (en) * | 2020-12-31 | 2021-05-25 | 南京航空航天大学 | Super structure-based multiband THz wave absorber |
| CN112838377B (en) * | 2020-12-31 | 2022-05-03 | 南京航空航天大学 | Super structure-based multiband THz wave absorber |
| CN113381200A (en) * | 2021-05-13 | 2021-09-10 | 宁波大学 | Electromagnetic absorption structure with wide incident angle |
| CN113381200B (en) * | 2021-05-13 | 2022-07-15 | 宁波大学 | Electromagnetic absorption structure with wide incident angle |
| CN117559141A (en) * | 2023-11-01 | 2024-02-13 | 广东技术师范大学 | Transparent broadband metamaterial wave absorber based on topological optimization and preparation method thereof |
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