CN102770009A - Wave-absorbing metamaterial - Google Patents
Wave-absorbing metamaterial Download PDFInfo
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- CN102770009A CN102770009A CN2011101139215A CN201110113921A CN102770009A CN 102770009 A CN102770009 A CN 102770009A CN 2011101139215 A CN2011101139215 A CN 2011101139215A CN 201110113921 A CN201110113921 A CN 201110113921A CN 102770009 A CN102770009 A CN 102770009A
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Abstract
The invention discloses a wave-absorbing metamaterial, which comprises a base material and a plurality of small holes. The base material is divided into a plurality of crystal lattices; the small holes are placed into the crystal lattices to form a unit; and the small holes are filled with materials capable of consuming electromagnetic waves. The wave-absorbing metamaterial, disclosed by the invention, has the advantages of small volume, simplicity, easiness in realization, low cost, and wide application prospect.
Description
Technical field
The present invention relates to ultra field of materials, more particularly, relate to the ultra material of a kind of suction ripple.
Background technology
At present, along with the development of modern science, the influence of Electromagnetic Radiation on Environment increases day by day, seeks a kind of material---the absorbing material that can keep out and weaken electromagenetic wave radiation, becomes a big problem of current material science.Human research to absorbing material starts from during the Second World War, and western countries are military leading for realizing, drop into huge fund research absorbing material.Now, along with developing rapidly of electronic product, the application of absorbing material is deep into numerous areas such as communication, anti-interference, environmental protection and physical protection.Electromagnetic wave absorption material is as the branch of material science, its application extensively, make it probably to become new industry at the turn of the century, become the basic industry of every profession and trades such as electronics, also will make huge contribution for reinventing human clean room.
Ultra material (metamaterial) more and more causes people's attention as a kind of material design concept and research forward position, and so-called ultra material is meant artificial composite structure or composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design through on the key physical yardstick of material can break through the restriction of some apparent natural law, thereby obtains to exceed the intrinsic common meta-materials function of nature.
Developing " the ultra material " that so far comprising: " LHM ", photonic crystal, " ultra magnetic material " etc., ultra material character are the intrinsic properties of major decision and constituent material not often, and is decided by artificial structure wherein.
Ultra material influences the index that electromagnetic wave is mainly paid close attention to the following aspects:
1) high-performance.Should have higher performance to electromagnetic influence, near the needed state that influences.
2) low-loss.Has higher energy affect efficient, with the target that realizes saving energy and reduce the cost.
3) size is little.Do not take too much space.
In addition, should be easy to realize that design should be too not complicated to electromagnetic influence, device cost should be not too high.
Ultra material is formed the material behavior that can provide various common materials to have and do not have by media substrate and a plurality of artificial structure that is provided with on the base material.Single artificial structure size is generally less than 1/10 wavelength, and it has electroresponse and/or magnetic response to extra electric field and/or magnetic field, thereby has the effective dielectric constant of showing and/or equivalent permeability, perhaps equivalent refractive index and wave impedance.The effective dielectric constant of artificial structure and equivalent permeability (or equivalent refractive index and wave impedance) can artificially be designed and control by the decision of cell geometry dimensional parameters.And artificial structure can have the anisotropic electromagnetic parameter of artificial design, thereby produces the phenomenon of many novelties, for realizing electromagnetic influence possibility is provided.
Summary of the invention
The technical problem that the present invention will solve is, provide a kind of volume little, simple, be easy to realize and the ultra material of a kind of suction ripple that cost is low influences electromagnetic wave.
The present invention solves first technical scheme that its technical problem adopts: the ultra material of a kind of suction ripple; Comprise: base material and a plurality of aperture; Said base material is divided into some lattices, and said aperture places said lattice to form a unit, is filled with the electromagnetic material of loss in the said aperture.
In the ultra material of suction ripple of the present invention, said ultra material is piled up by a plurality of plate shape substrates and forms, and each plate shape substrates is formed by base material and a plurality of aperture, and all apertures form periodic array on base material.
In the ultra material of suction ripple of the present invention, said aperture is periodically evenly distribution on described base material.
In the ultra material of suction ripple of the present invention; When electromagnetic wave gets into second medium by first medium through described ultra material; Under the situation that base material is selected; Change pattern of apertures, design size and/or the arrangement of aperture in the space and obtain the effective dielectric constant ε and the equivalent permeability μ numerical value of said unit, to satisfy the impedance matching requirement through emulation.
In the ultra material of suction ripple of the present invention, said first medium and second medium are air.
In the ultra material of suction ripple of the present invention, the electromagnetic material of loss is dielectric substance, magnetic media material, resistance material in the said aperture.
In the ultra material of suction ripple of the present invention, said dielectric substance is barium titanate porcelain, ferroelectric ceramic.
In the ultra material of suction ripple of the present invention, said magnetic media material is Ferrite Material, carbonyl iron.
In the ultra material of suction ripple of the present invention, said resistance material is carbon black, carborundum.
In the ultra material of suction ripple of the present invention, described hole shape is column type, pyramid type, ellipse.
In the ultra material of suction ripple of the present invention, said aperture forms on base material through punching, etching, brill quarter, photoetching, electronics is carved or ion is carved method.
In the ultra material of suction ripple of the present invention, said base material is made by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.
The electromagnetic ultra material of the absorption of embodiment of the present invention has following beneficial effect:
1. volume is little, does not take too much space;
2. simple, be easy to realize, low cost, through ultra material electromagnetic wave is influenced, do not rely on the kind and the shape of equipment.
Description of drawings
Fig. 1 is a kind of suction ripple of embodiment of the invention metamaterial structure block diagram;
Fig. 2 is another visual angle of Fig. 1.
Embodiment
By specifying technology contents of the present invention, structural feature, realized purpose and effect, give explanation below in conjunction with execution mode and conjunction with figs. are detailed.
" ultra material " is meant artificial composite structure or the composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design through on the key physical yardstick of material can break through the restriction of some apparent natural law, thereby obtains to exceed the meta-materials function of the intrinsic common character of nature.
Three key characters that " ultra material " is important:
(1) " ultra material " the composite material that normally has novel artificial structure;
(2) " ultra material " has extraordinary physical property (not available in the natural often material);
(3) " ultra material " character intrinsic properties of major decision and constituent material not often, and be decided by artificial structure wherein.
See also Fig. 1 and Fig. 2, in instance of the present invention, the ultra material 30 of a kind of suction ripple; Comprise: base material 10 and a plurality of aperture 20; Be filled with the electromagnetic material of loss in the aperture 20, base material 10 and a plurality of aperture 20 are formed a ultra material plate shape substrates, and Fig. 1 inhales the structural representation of the ultra material of ripple for the embodiment of the invention; It is actually a plurality of ultra material plate shape substrates edges direction vertical with horizontal plane and cascades, and Fig. 2 is the front view of a ultra material plate shape substrates.Base material 10 is divided into a plurality of lattices, and the notion of " lattice " is from solid-state physics, and " lattice " here is meant in ultra material 30 size that each aperture 20 is shared." lattice " size depends on the wave frequency of aperture 20 needs responses, usually aperture 20 be of a size of required response electromagnetic wavelength 1/10th.
In the present embodiment, all apertures 20 form periodic array on base material 10, and preferably, aperture 20 is periodically evenly distribution on base material 10.
In the present embodiment, when electromagnetic wave gets into second medium by first medium through ultra material 30, under the situation that base material 10 is selected; The shape, design size and/or the arrangement of aperture 20 in the space that change aperture 20 obtain the effective dielectric constant ε and the equivalent permeability μ numerical value of said unit through emulation; To satisfy the impedance matching requirement, first medium and second medium all can be air, in the practical application; Also can be other medium; Material like liquid state: water, wet goods also can be solid-state material, like glass and plastics etc.
By common practise; We can know: the Bob full name is a voltage standing wave ratio, has another name called VSWR and SWR, is writing a Chinese character in simplified form of English Voltage Standing Wave Ratio; In radio communication; The impedance of antenna and feeder line does not match or the impedance of antenna and sender does not match, and high-frequency energy will produce reflection and turn back, and converges the generation standing wave with the part interference of advancing.In order to characterize and measure the stationary wave characteristic in the antenna system, just the situation of forward wave and reflected wave in the antenna has following formula: SWR=R/r=(1+K)/(1-K); Reflection coefficient K=(R-r)/(R+r) (K for negative value time show that phase place is opposite), R and r are respectively output impedance and input impedance in the formula.When two impedance value are the same, promptly reach coupling fully, reflection coefficient K equals 0, and standing-wave ratio is 1.This is a kind of desirable situation, in fact always have reflection, so standing-wave ratio is always greater than 1.
Because standing-wave ratio is the inverse of traveling wave coefficient, it is worth 1 between the infinity.Standing-wave ratio is 1, and expression is coupling fully; Standing-wave ratio is infinitely great expression total reflection, mismatch fully.In GSM, generally require standing-wave ratio less than 1.5, but VSWR should be less than 1.2 in the practical application.Excessive standing-wave ratio can reduce the covering of base station and cause to disturb in the system and strengthen, and influences the service performance of base station.
In the present invention; Utilize the changeability of the electromagnetic parameter of ultra material 30 self, regulate dielectric constant and magnetic permeability, thereby regulate the characteristic impedance of ultra material 30; Realize that electromagnetic wave gets into the impedance matching that ultra material 30 back impedances reach from first medium; Reflection is dropped to minimum, standing-wave ratio is 1, realizes basic areflexia.Because the electromagnetic parameter of ultra material 30 can artificially be controlled,, reach wide band requirement so go for realizing impedance matching.
In the present embodiment, the material of loss electromagnetic wave 30 is dielectric substance, magnetic media material or resistance material in the aperture 20.
In the present embodiment, dielectric substance is barium titanate porcelain or ferroelectric ceramic.
In the present embodiment, magnetic media material is Ferrite Material or carbonyl iron.
In the present embodiment, resistance material is carbon black or carborundum.
Ordered mesopore carbon and silicon dioxide composite ceramic material that material in the aperture 20 was once mentioned with some technical literature also can.
In the present embodiment, aperture 20 is shaped as cube, column type, pyramid type or ellipse.
In the present embodiment, aperture 20 forms on base material 10 through the method for aperture through punching, high temperature sintering, punching press or injection moulding.
In the present embodiment, said base material 10 is made by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.Preferably, the electrical insulating property of polytetrafluoroethylene is very good, therefore can not produce electromagnetic electric field and disturb, and have excellent chemical stability, corrosion resistance, long service life, and the base material 10 that adheres to as aperture 20 is good selections.
Wherein, some apertures 20 are attached on the medium substrate 10, according to the electromagnetic wavelength X that will receive, can base material 20 be divided into some lattices, and its length and width can not surpass 1/10 of wavelength X, and some apertures 20 are placed lattice.
Some artificial apertures 20 can be designed the aperture with certain electric magnetic characteristic by manual work through being realized by the artificial technology.
The product reaction of the DIELECTRIC CONSTANTS of electromagnetic refractive index material and magnetic permeability μ has relation; When a branch of electromagnetic wave was propagated into other a kind of medium by a kind of medium, electromagnetic wave can reflect, and the big more position deviation angle of refractive index is big more; When the inner refraction index profile of material is non-homogeneous; Electromagnetic wave will through changing the distribution of refractive index in material, can change the electromagnetic wave propagation path to the bigger position deviation of refractive index ratio.
Ultra material can be to electric field or magnetic field, and perhaps both carry out corresponding simultaneously.The DIELECTRIC CONSTANTS of ultra material is depended in the response of electric field, and the magnetic permeability μ of ultra material is depended in the response in magnetic field.Through to the DIELECTRIC CONSTANTS of every bit in the ultra material space and the accurate control of magnetic permeability μ, we can realize through ultra material electromagnetic influence.
Even or the heterogeneous distribution of the electromagnetic parameter of ultra material in the space is one of key character of ultra material.A kind of special shape that evenly be distributed as non-uniform Distribution of electromagnetic parameter in the space, but its concrete property, the characteristic that remains by each cellular construction of arranging in the space determines.Therefore, through the characteristic of each structure of arranging in the design space, just can design the electromagnetic property of whole novel ultra material every bit in the space.This electromagnetic material system will have numerous unusual characteristics, can play special guiding function to electromagnetic wave propagation.
The effective dielectric constant ε of aperture and substrate and the system of selection of equivalent permeability μ are:
The first step; Through Computer Simulation and experiment test; Cellular construction (comprising aperture and medium substrate) electromagnetic property within the specific limits to some various geometric is measured; The electromagnetic response curve that measures of storage is confirmed the dielectric constant and the magnetic permeability of various cellular construction and is present in the database;
In second step, the electromagnetic effect of influence is as required confirmed corresponding dielectric constant and magnetic permeability, exists in the database.
In the 3rd step, from database, select the cellular construction of ultra material respective point according to above-mentioned dielectric constant and magnetic permeability.
Those skilled in the art should expect, above-mentioned method is that the method with software program realizes that this software program may reside in hard disk, floppy disk, USB flash disk and the CD.
Among the present invention, the concrete shape of aperture 20 is not required, because it is as long as it meets our final impedance matching effect, promptly feasible.Generally speaking, aperture is periodic array in the space, and preferably, all apertures are inhomogeneity periodic array in the space.Given this, the combination of aperture 20 on ultra material is unlimited.The diagram shape that can be aperture is identical, but its design size is different; Also can be that shape and design size are all inequality.This can be different according to concrete needs; All be the result after the Computer Simulation; The shape, design size and the spatial arrangement that is to say aperture in the whole ultra material all obtain through computer is reverse; Because the quantity of aperture is huge in the whole ultra material, if therefore forward design can't realize at all.
The present invention utilizes the orderly arrangement of aperture; Through (general to require refraction to take the lead in big from little change to the product non-uniform Distribution of the effective dielectric constant ε and the equivalent permeability μ of base material 10 and aperture 20; After again from diminishing greatly); Thereby reach the purpose of impedance matching, absorb while electromagnetic wave is propagated.
The electromagnetic ultra material of the absorption of embodiment of the present invention has following beneficial effect:
1. volume is little, does not take too much space;
2. simple, be easy to realize, low cost, through ultra material electromagnetic wave is absorbed, do not rely on the kind and the shape of electromagnetic wave equipment;
Combine accompanying drawing that embodiments of the invention are described above; But the present invention is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.
Claims (12)
1. inhale the ultra material of ripple for one kind, it is characterized in that, comprising: base material and a plurality of aperture, said base material is divided into a plurality of lattices, and said aperture places said lattice to form a unit, is filled with the electromagnetic material of loss in the said aperture.
2. the ultra material of suction ripple as claimed in claim 1 is characterized in that, said ultra material is piled up by a plurality of plate shape substrates and forms, and each plate shape substrates is formed by base material and a plurality of aperture, and all apertures form periodic array on base material.
3. the ultra material of suction ripple as claimed in claim 2 is characterized in that, said aperture is periodically evenly distribution on described base material.
4. the ultra material of suction ripple as claimed in claim 1; It is characterized in that; When electromagnetic wave gets into second medium by first medium through described ultra material; Under the selected situation of base material, shape, design size and/or the aperture arrangement in the space that changes aperture obtains the effective dielectric constant ε and the equivalent permeability μ numerical value of said unit through emulation, to satisfy the impedance matching requirement.
5. the ultra material of suction ripple as claimed in claim 4 is characterized in that said first medium and second medium are air.
6. the ultra material of suction ripple as claimed in claim 1 is characterized in that the electromagnetic material of loss is dielectric substance, magnetic media material, resistance material in the said aperture.
7. the ultra material of suction ripple as claimed in claim 6 is characterized in that said dielectric substance is barium titanate porcelain or ferroelectric ceramic.
8. the ultra material of suction ripple as claimed in claim 6 is characterized in that said magnetic media material is Ferrite Material or carbonyl iron.
9. the ultra material of suction ripple as claimed in claim 6 is characterized in that said resistance material is carbon black or carborundum.
10. the ultra material of suction ripple as claimed in claim 1 is characterized in that described hole shape is cube, column type, pyramid type or ellipse.
11. the ultra material of suction ripple as claimed in claim 10 is characterized in that the method for said aperture punching, high temperature sintering, punching press or injection moulding forms on base material.
12. the ultra material of suction ripple as claimed in claim 1 is characterized in that said base material is made by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.
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| CN201110113921.5A CN102770009B (en) | 2011-05-04 | 2011-05-04 | A kind of suction ripple Meta Materials |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103219572A (en) * | 2013-04-18 | 2013-07-24 | 南京大学 | Microwave band-pass filter |
| CN103579776A (en) * | 2013-10-31 | 2014-02-12 | 电子科技大学 | Electromagnetic wave-absorbing material with performance of improving oblique incidence |
| CN104661503A (en) * | 2015-01-30 | 2015-05-27 | 西北工业大学 | Force-controlled adjustable-broadband flexible wave absorption device based on conductive rubber and manufacturing method for device |
| CN104852153A (en) * | 2015-04-15 | 2015-08-19 | 北京航空航天大学 | Broadband reduction RCS composite material based on crossed bow-tie-shaped AMC |
| CN105101769A (en) * | 2015-07-31 | 2015-11-25 | 武汉理工大学 | Embedded composite meta-material absorber |
| CN106911006A (en) * | 2017-02-21 | 2017-06-30 | 西北工业大学 | Periodicity micro-hole absorbent structure and method based on ultra-short pulse laser processing |
| CN107093804A (en) * | 2017-04-27 | 2017-08-25 | 南京大学 | A kind of adjustable artificial electromagnetic absorbing meta-material of Wideband for loading water droplet |
| CN108897087A (en) * | 2018-06-13 | 2018-11-27 | 电子科技大学中山学院 | Nano structure capable of improving asymmetric transmission and preparation method thereof |
| CN109574707A (en) * | 2019-01-24 | 2019-04-05 | 中国人民解放军空军工程大学 | A kind of micropore magnetic medium composite ceramics absorbing meta-material and preparation method thereof |
| CN113067166A (en) * | 2021-03-23 | 2021-07-02 | 广东顺德西安交通大学研究院 | Ultrathin high-temperature-resistant broadband wave absorbing body, wave absorbing plate and part |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219572A (en) * | 2013-04-18 | 2013-07-24 | 南京大学 | Microwave band-pass filter |
| CN103219572B (en) * | 2013-04-18 | 2015-10-28 | 南京大学 | Microwave band-pass filter |
| CN103579776A (en) * | 2013-10-31 | 2014-02-12 | 电子科技大学 | Electromagnetic wave-absorbing material with performance of improving oblique incidence |
| CN104661503B (en) * | 2015-01-30 | 2017-06-13 | 西北工业大学 | Power control adjustable wide frequency flexibility wave absorbing device part based on conductive rubber and preparation method thereof |
| CN104661503A (en) * | 2015-01-30 | 2015-05-27 | 西北工业大学 | Force-controlled adjustable-broadband flexible wave absorption device based on conductive rubber and manufacturing method for device |
| CN104852153A (en) * | 2015-04-15 | 2015-08-19 | 北京航空航天大学 | Broadband reduction RCS composite material based on crossed bow-tie-shaped AMC |
| CN105101769A (en) * | 2015-07-31 | 2015-11-25 | 武汉理工大学 | Embedded composite meta-material absorber |
| CN106911006A (en) * | 2017-02-21 | 2017-06-30 | 西北工业大学 | Periodicity micro-hole absorbent structure and method based on ultra-short pulse laser processing |
| CN107093804A (en) * | 2017-04-27 | 2017-08-25 | 南京大学 | A kind of adjustable artificial electromagnetic absorbing meta-material of Wideband for loading water droplet |
| CN108897087A (en) * | 2018-06-13 | 2018-11-27 | 电子科技大学中山学院 | Nano structure capable of improving asymmetric transmission and preparation method thereof |
| CN108897087B (en) * | 2018-06-13 | 2019-08-23 | 电子科技大学中山学院 | Nano structure capable of improving asymmetric transmission and preparation method thereof |
| CN109574707A (en) * | 2019-01-24 | 2019-04-05 | 中国人民解放军空军工程大学 | A kind of micropore magnetic medium composite ceramics absorbing meta-material and preparation method thereof |
| CN109574707B (en) * | 2019-01-24 | 2021-09-21 | 中国人民解放军空军工程大学 | Microporous magnetic medium composite ceramic wave-absorbing metamaterial and preparation method thereof |
| CN113067166A (en) * | 2021-03-23 | 2021-07-02 | 广东顺德西安交通大学研究院 | Ultrathin high-temperature-resistant broadband wave absorbing body, wave absorbing plate and part |
| CN113067166B (en) * | 2021-03-23 | 2024-04-12 | 广东顺德西安交通大学研究院 | Ultra-thin high temperature resistant broadband wave absorber, wave absorbing plate and part |
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Effective date of registration: 20160330 Address after: 518057, Nanshan District hi tech Zone, central high tech 9, a software building No. 2, building on the ground floor, Shenzhen Patentee after: Shenzhen Guangqi Innovative Technology Co., Ltd. Address before: 518000, No. 9 software building 518000, high tech Zone, central high tech Zone, Shenzhen, Guangdong, Nanshan District Patentee before: Shenzhen Kuang-Chi Institute of Advanced Technology Patentee before: Shenzhen Kuang-Chi Innovation Technology Co., Ltd. |