CN102770009B - A kind of suction ripple Meta Materials - Google Patents
A kind of suction ripple Meta Materials Download PDFInfo
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- CN102770009B CN102770009B CN201110113921.5A CN201110113921A CN102770009B CN 102770009 B CN102770009 B CN 102770009B CN 201110113921 A CN201110113921 A CN 201110113921A CN 102770009 B CN102770009 B CN 102770009B
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Abstract
The invention discloses a kind of suction ripple Meta Materials, comprising: base material and multiple aperture, described base material is divided into multiple lattice, and described aperture is placed in described lattice and forms a unit, is filled with the electromagnetic material of loss in described aperture.One provided by the invention inhale ripple Meta Materials volume little, simple, be easy to realize, cost is low, be with a wide range of applications.
Description
Technical field
The present invention relates to Meta Materials field, more particularly, relate to a kind of suction ripple Meta Materials.
Background technology
At present, along with the development of modern science, the impact of Electromagnetic Radiation on Environment increases day by day, finds a kind ofly can keep out and weaken material---the absorbing material of electromagenetic wave radiation, becomes a large problem of current material science.The research of the mankind to absorbing material starts from during the Second World War, and western countries are military leading for realizing, and drop into huge fund research absorbing material.Now, along with developing rapidly of electronic product, the application of absorbing material is deep into communication, anti-interference, the numerous areas such as environmental protection and physical protection.Electromagnetic wave absorption material is as the branch of material science, and it is extensive that it is applied, and probably making it to become NPD projects at the turn of the century, become the basic industry of the every profession and trades such as electronics, also will make tremendous contribution for reinventing mankind's clean room.
Meta Materials (metamaterial) is as a kind of design of material theory and study frontier, more and more cause the concern of people, so-called Meta Materials, refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus acquisition exceeds the intrinsic common meta-materials function of nature.
" Meta Materials " that develop so far comprising: " left-handed materials ", photonic crystal, " super magnetic material " etc., the intrinsic properties of Meta Materials character often not major decision and constituent material, and is decided by artificial structure wherein.
Meta Materials affects the index that electromagnetic wave mainly pays close attention to the following aspects:
1) high-performance.Higher performance should be had on electromagnetic impact, affect state close to required.
2) low-loss.There is higher energy affect efficiency, to realize the target of saving energy and reduce the cost.
3) size is little.Do not take too much space.
In addition, should be easy to realize on electromagnetic impact, design should be too not complicated, and device cost should be not too high.
Meta Materials is made up of media substrate and the multiple artificial structure arranged on upper base material, can provide the material behavior that various common material has and do not have.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, thus has and show effective dielectric constant and/or equivalent permeability, or equivalent refractive index and wave impedance.The effective dielectric constant of artificial structure and equivalent permeability (or equivalent refractive index and wave impedance) are determined by cell geometry dimensional parameters, can artificially design and control.Further, artificial structure can have the anisotropic electromagnetic parameter of artificial design, thus produces the phenomenon of many novelties, provides possibility for realizing electromagnetic impact.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of volume one affected electromagnetic wave that is little, simple, that be easy to realize and cost is low to inhale ripple Meta Materials.
The present invention solves the first technical scheme that its technical problem adopts: a kind ofly inhale ripple Meta Materials, comprise: base material and multiple aperture, described base material is divided into some lattices, and described aperture is placed in described lattice and forms a unit, is filled with the electromagnetic material of loss in described aperture.
In suction ripple Meta Materials of the present invention, described Meta Materials is formed by multiple plate shape substrates is stacking, and each plate shape substrates is by base material and multiple aperture composition, and all apertures form periodic array on base material.
In suction ripple Meta Materials of the present invention, described aperture is uniformly distributed in periodicity on described base material.
In suction ripple Meta Materials of the present invention, when electromagnetic wave enters second medium by first medium by described Meta Materials, when base material is selected, change the pattern of aperture, design size and/or aperture arrangement in space obtain described unit effective dielectric constant ε and equivalent permeability μ numerical value by emulating, to meet impedance matching requirements.
In suction ripple Meta Materials of the present invention, described first medium and second medium are air.
In suction ripple Meta Materials of the present invention, in described aperture, the electromagnetic material of loss is dielectric substance, magnetic media material, resistance material.
In suction ripple Meta Materials of the present invention, described dielectric substance is barium titanate porcelain, ferroelectric ceramic.
In suction ripple Meta Materials of the present invention, described magnetic media material is Ferrite Material, carbonyl iron.
In suction ripple Meta Materials of the present invention, described resistance material is carbon black, carborundum.
In suction ripple Meta Materials of the present invention, described hole shape is column type, pyramid type, ellipse.
In suction ripple Meta Materials of the present invention, the method that described aperture is carved by quarter of punching, etch, bore, photoetching, electronics quarter or ion is formed on base material.
In suction ripple Meta Materials of the present invention, described base material is obtained by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.
Implement the Meta Materials of electromagnetic wave absorption of the present invention, there is following beneficial effect:
1. volume is little, does not take too much space;
2. simply, be easy to realization, low cost, by Meta Materials, electromagnetic wave affected, do not rely on kind and the shape of equipment.
Accompanying drawing explanation
Fig. 1 is that embodiment of the present invention one inhales ripple metamaterial structure block diagram;
Fig. 2 is another visual angle of Fig. 1.
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with execution mode.
" Meta Materials " refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus obtain the meta-materials function exceeding the intrinsic common character of nature.
Three key characters that " Meta Materials " is important:
(1) " Meta Materials " normally has the composite material of novel artificial structure;
(2) " Meta Materials " has extraordinary physical property (often in natural material not available);
(3) intrinsic properties of " Meta Materials " character often not major decision and constituent material, and be decided by artificial structure wherein.
Refer to Fig. 1 and Fig. 2, in example of the present invention, a kind of suction ripple Meta Materials 30, comprise: base material 10 and multiple aperture 20, be filled with the electromagnetic material of loss in aperture 20, base material 10 and multiple aperture 20 form a Meta Materials plate shape substrates, and Fig. 1 is the structural representation that the embodiment of the present invention inhales ripple Meta Materials, it is actually multiple Meta Materials plate shape substrates along being laminated with the direction of horizontal plane, and Fig. 2 is the front view of a Meta Materials plate shape substrates.Base material 10 is divided into multiple lattice, and the concept of " lattice " is from solid-state physics, and " lattice " here refers to the size in Meta Materials 30 shared by each aperture 20." lattice " size depends on the wave frequency that aperture 20 needs respond, and usual aperture 20 is of a size of 1/10th of the electromagnetic wavelength of required response.
In the present embodiment, all apertures 20 form periodic array on base material 10, and preferably, aperture 20 is uniformly distributed in periodicity on base material 10.
In the present embodiment, when electromagnetic wave enters second medium by first medium by Meta Materials 30, when base material 10 is selected, change the shape of aperture 20, design size and/or aperture 20 arrangement in space obtain described unit effective dielectric constant ε and equivalent permeability μ numerical value by emulating, to meet impedance matching requirements, first medium and second medium all can be air, in practical application, also can be other medium, material as liquid state: water, wet goods, also can be solid-state material, as glass and plastics etc.
By common practise, we are known: Bob full name is voltage standing wave ratio, have another name called VSWR and SWR, for writing a Chinese character in simplified form of English Voltage Standing Wave Ratio, in the radio communication, the impedance mismatch of the impedance mismatch of antenna and feeder line or antenna and sender, high-frequency energy will produce reflection and turn back, and disturbs converge generation standing wave with the part of advancing.In order to characterize and measure the stationary wave characteristic in antenna system, namely the situation of forward wave and reflected wave in antenna, has following formula: SWR=R/r=(1+K)/(1-K); Reflection coefficient K=(R-r)/(R+r) (showing that phase place is contrary when K is negative value), in formula, R and r is output impedance and input impedance respectively.When two impedance value are the same, namely reach and mate completely, reflection coefficient K equals 0, and standing-wave ratio is 1.This is a kind of desirable situation, in fact always there is reflection, so standing-wave ratio is always greater than 1.
Due to the inverse that standing-wave ratio is traveling wave coefficient, its value is between 1 to infinity.Standing-wave ratio is 1, represents and mates completely; Standing-wave ratio is infinitely great expression total reflection, complete mismatch.In mobile communication system, General Requirements standing-wave ratio is less than 1.5, but in practical application, VSWR should be less than 1.2.Excessive standing-wave ratio can reduce the covering of base station and cause interference in system to strengthen, and affects the service performance of base station.
In the present invention, utilize the changeability of the electromagnetic parameter of Meta Materials 30 self, regulate dielectric constant and magnetic permeability, thus regulate the characteristic impedance of Meta Materials 30, realize electromagnetic wave and enter from first medium the impedance matching that impedance after Meta Materials 30 reaches, reflection dropped to minimum, standing-wave ratio is 1, realizes basic areflexia.Because the electromagnetic parameter of Meta Materials 30 can manual control, so go for realizing impedance matching, reach wide band requirement.
In the present embodiment, in aperture 20, the material of loss electromagnetic wave 30 is dielectric substance, magnetic media material or resistance material.
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.
The ordered mesopore carbon that material in aperture 20 was once mentioned with some technical literature and silicon dioxide composite ceramic material also can.
In the present embodiment, aperture 20 shape is cube, column type, pyramid type or ellipse.
In the present embodiment, aperture 20 is formed on base material 10 by the method for aperture by punching, high temperature sintering, punching press or injection moulding.
In the present embodiment, described base material 10 is obtained by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.Preferably, the electrical insulating property of polytetrafluoroethylene is very good, and therefore can not produce interference to electromagnetic electric field, and have excellent chemical stability, corrosion resistance, long service life, the base material 10 adhered to as aperture 20 is good selections.
Wherein, some apertures 20 are attached on medium substrate 10, and according to the electromagnetic wavelength X that will receive, base material 20 can be divided into some lattices, its length and width can not exceed 1/10 of wavelength X, and some apertures 20 are placed in lattice.
Some artificial apertures 20, by being realized by artificial technology, can be designed by the artificial aperture to having certain electric magnetic characteristic.
The DIELECTRIC CONSTANT ε of electromagnetic refractive index material and the product reaction of magnetic permeability μ have relation, when a branch of electromagnetic wave by a kind of Medium Propagation to another medium time, electromagnetic wave can reflect, and the larger position deviation angle of refractive index is larger, when the refraction index profile of material inside is non-homogeneous, electromagnetic wave to the larger position deviation of refractive index ratio, by changing refractive index distribution in the material, will can change electromagnetic wave propagation path.
Meta Materials can to electric field or magnetic field, or both carry out corresponding simultaneously.The response of electric field is depended on to the DIELECTRIC CONSTANT ε of Meta Materials, and the response in magnetic field is depended on to the magnetic permeability μ of Meta Materials.By to the DIELECTRIC CONSTANT ε of every bit in Meta Materials space and the accurate control of magnetic permeability μ, we can realize by Meta Materials electromagnetic impact.
The electromagnetic parameter even or distribution heterogeneous in space of Meta Materials is one of key character of Meta Materials.The electromagnetic parameter a kind of special shape be uniformly distributed as non-uniform Distribution in space, but its concrete property, remain and determined by the characteristic of the unit structure arranged in space.Therefore, by the characteristic of each structure arranged in design space, the electromagnetic property of whole Novel meta-material every bit in space just can be designed.This electromagnetic material system will have numerous Strange properties, 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, by Computer Simulation and experiment test, cellular construction (comprising aperture and the medium substrate) electromagnetic property within the specific limits of some various geometric is measured, store and measure the electromagnetic response curve that obtains, determine the dielectric constant of various different cellular construction and magnetic permeability and be present in a database;
Second step, the electromagnetic effect of impact as required determines corresponding dielectric constant and magnetic permeability, exists in a database.
3rd step, selects the cellular construction of Meta Materials respective point from database according to above-mentioned dielectric constant and magnetic permeability.
Those skilled in the art should expect, above-mentioned method realizes by the method for software program, and this software program may reside in hard disk, floppy disk, USB flash disk and CD.
In the present invention, to the concrete shape not requirement of aperture 20, as long as because it meets our final impedance matching effect, namely feasible.Generally, aperture is in space in periodic array, and preferably, all apertures are the periodic array of uniformity in space.Given this, the combination of aperture 20 on Meta Materials is unlimited.The diagram shape that can be aperture is identical, but its design size is different; Also can be that shape is all not identical with design size.This according to specific needs can be different, it is all the result after Computer Simulation, that is in whole Meta Materials, the shape of aperture, design size and spatial arrangement all obtain by computer is reverse, because the substantial amounts of aperture in whole Meta Materials, if therefore Top-Down Design, cannot realize at all.
The present invention utilizes the ordered arrangement of aperture, by the product non-uniform Distribution to the effective dielectric constant ε of base material 10 and aperture 20 and equivalent permeability μ, (General Requirements refraction takes the lead in large from little change, after again from diminishing greatly), thus reach the object of impedance matching, electromagnetic wave is propagated and absorbs.
Implement the Meta Materials of electromagnetic wave absorption of the present invention, there is following beneficial effect:
1. volume is little, does not take too much space;
2. simply, be easy to realization, low cost, by Meta Materials, electromagnetic wave absorbed, do not rely on kind and the shape of electromagnetic wave device;
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (11)
1. inhale a ripple Meta Materials, it is characterized in that, comprising: base material and multiple aperture, described base material is divided into multiple lattice, and described aperture is placed in described lattice and forms a unit, is filled with the electromagnetic material of loss in described aperture; Described Meta Materials is formed by multiple plate shape substrates is stacking, and multiple described plate shape substrates is along the direction arranged stacked with horizontal plane; Each plate shape substrates is by base material and multiple aperture composition, and all apertures form periodic array on base material.
2. suction ripple Meta Materials as claimed in claim 1, it is characterized in that, described aperture is uniformly distributed in periodicity on described base material.
3. suction ripple Meta Materials as claimed in claim 1, it is characterized in that, when electromagnetic wave enters second medium by first medium by described Meta Materials, when base material is selected, change the shape of aperture, design size and/or aperture arrangement in space obtain described unit effective dielectric constant ε and equivalent permeability μ numerical value by emulating, to meet impedance matching requirements.
4. suction ripple Meta Materials as claimed in claim 3, it is characterized in that, described first medium and second medium are air.
5. suction ripple Meta Materials as claimed in claim 1, it is characterized in that, in described aperture, the electromagnetic material of loss is dielectric substance, magnetic media material or resistance material.
6. suction ripple Meta Materials as claimed in claim 5, it is characterized in that, described dielectric substance is barium titanate porcelain or ferroelectric ceramic.
7. suction ripple Meta Materials as claimed in claim 5, it is characterized in that, described magnetic media material is Ferrite Material or carbonyl iron.
8. suction ripple Meta Materials as claimed in claim 5, it is characterized in that, described resistance material is carbon black or carborundum.
9. suction ripple Meta Materials as claimed in claim 1, it is characterized in that, described hole shape is cube, column type, pyramid type or ellipse.
10. suction ripple Meta Materials as claimed in claim 9, it is characterized in that, described aperture is formed on base material by the method for punching or high temperature sintering or punching press or injection moulding.
11. inhale ripple Meta Materials as claimed in claim 1, and it is characterized in that, described base material is obtained by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material.
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| 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 improved oblique incidence performance |
| 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 |
| CN104852153B (en) * | 2015-04-15 | 2017-10-10 | 北京航空航天大学 | It is a kind of that RCS composites are reduced based on the broadband for intersecting bowtie-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 |
| 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 |
| 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 |
| 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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| CN1401562A (en) * | 2002-10-14 | 2003-03-12 | 北京大学 | Carbon nano-tube/ferromagnetism metal nanowire composite material, mfg. method and use thereof |
| CN101800104A (en) * | 2009-02-09 | 2010-08-11 | 索尼株式会社 | Electromagnetic wave suppresses and heat transmission synthetic and manufacture method thereof |
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| CN1401562A (en) * | 2002-10-14 | 2003-03-12 | 北京大学 | Carbon nano-tube/ferromagnetism metal nanowire composite material, mfg. method and use thereof |
| CN101800104A (en) * | 2009-02-09 | 2010-08-11 | 索尼株式会社 | Electromagnetic wave suppresses and heat transmission synthetic and manufacture method thereof |
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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. |