CN104393419A - Negative magnetic permeability meta-material - Google Patents
Negative magnetic permeability meta-material Download PDFInfo
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- CN104393419A CN104393419A CN201410689654.XA CN201410689654A CN104393419A CN 104393419 A CN104393419 A CN 104393419A CN 201410689654 A CN201410689654 A CN 201410689654A CN 104393419 A CN104393419 A CN 104393419A
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Abstract
The invention discloses a negative magnetic permeability meta-material which comprises a dielectric substrate and a microstructure layer fixed on the dielectric substrate. The microstructure layer comprises N single microstructures, the single microstructures are arranged by the aid of a periodic array, the N is larger than or equal to 1, each single microstructure comprises three metal wires, the three metal wires include a first L-shaped metal wire, a second L-shaped metal wire and a third L-shaped metal wire, the lengths of the three metal wires are equal, an L-shaped included angle is 60 degrees, the three metal wires are rotatably arranged on the same plane around the same center, the second metal wire rotates by 120 degrees and then is overlapped with the first metal wire, and the third metal wire rotates by 240 degrees and then is overlapped with the first metal wire. Negative magnetic permeability of the meta-material is met, the resonant frequency of the meta-material can be effectively reduced, the requirement of a negative magnetic permeability value on the meta-material in some special conditions is met, and the manufactured meta-material is isotropic.
Description
Technical field
The present invention relates to electromagnetic communication field, particularly relate to a kind of negative-magnetic-permeability meta-material.
Background technology
At present, international community has large quantifier elimination to magnetic permeability aspect, research wherein for positive magnetic permeability has been tending towards ripe, research for negative-magnetic-permeability meta-material is the focus of research both at home and abroad now, negative magnetoconductivity has quantum polarization, polarization can be produced to incident wave, therefore sphere of action is very large, as the mr imaging technique in medical imaging field, negative magnetic-inductive capacity material can strengthen electromagnetic imaging effect, negative magnetic-inductive capacity material also plays an important role in lens research in addition, at engineering field, magnetic permeability all refers to relative permeability usually, for absolute permeability μ and the magnetic constant μ of material
0the ratio of (also known as permeability of vacuum), μ
r=μ/μ
0, dimensionless number.Usually " relatively " two word and symbol subscript r be all removed.Magnetic permeability is when representing that material is subject to magnetizing field H effect, the increase (μ > 1) of inner true magnetic field relative to H or the degree of minimizing (μ < 1).So far, in the already present material of the nature found, μ is greater than 0.
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.The character of Meta Materials and function mainly come from the structure of its inside but not form their material.At present, the geometry of existing man-made microstructure is the open annular of " work " font or similar " recessed " font, but these structures all can not realize magnetic permeability μ and be significantly less than 0 or make meta-material resonant frequency reduce, isotropism can not be realized, only has the man-made microstructure by design with special geometric figure, just can make this artificial electromagnetic material in special frequency channel, reach magnetic permeability μ value and be less than 0, and there is lower resonance frequency.
Summary of the invention
The embodiment of the present invention provides a kind of negative-magnetic-permeability meta-material, by using by three L shape metal wires at grade around the metal micro structure that same central rotation arranges, under the prerequisite of negative magnetoconductivity realizing Meta Materials, effectively can reduce the resonance frequency of Meta Materials, meet the requirement to the magnetic permeability value of Meta Materials under some specific conditions, the Meta Materials made meets isotropism.
The embodiment of the present invention provides a kind of negative-magnetic-permeability meta-material, it is characterized in that, comprising: medium substrate and the microstructured layers be fixed on medium substrate;
Described microstructured layers comprises the single micro-structural of N number of arrangement in cyclic array, N >=1;
Described single micro-structural comprises three wires, and described three wires are respectively the first metal wire, the second metal wire and the 3rd metal wire, and the length of described three wires is equal; Every wires is all L-shaped, and the angle of described L shape is 60 degree;
Described three wires arrange around same central rotation at grade, overlap after described second metal wire rotates 120 ° with described first metal wire, overlap after described 3rd metal wire rotates 240 ° with described first metal wire.
Further, described Meta Materials is laminated by two-layer described medium substrate is alternate with two-layer described microstructured layers.
Further, described two layer medium substrate comprises first medium substrate and second medium substrate, and the dielectric constant of first medium substrate is 10-20, and the dielectric constant of second medium substrate is 5-10.
Further, the thickness of described first medium substrate is 0.005-0.015mm.
Further again, the thickness of described second medium substrate is 0.10mm-0.30mm.
A kind of negative-magnetic-permeability meta-material that the embodiment of the present invention provides, have employed by three L shape metal wires at grade around the metal micro structure that same central rotation arranges, add electric capacity and the inductance of Meta Materials, under the prerequisite of negative magnetoconductivity realizing Meta Materials, effectively can reduce the resonance frequency of Meta Materials, meet the requirement to the magnetic permeability value of Meta Materials under some specific conditions; Meanwhile, comprise the microstructured layers of the single micro-structural of N number of arrangement in cyclic array, make whole Meta Materials meet isotropism, practical.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the single micro-structural of the embodiment of negative-magnetic-permeability meta-material provided by the invention;
Fig. 2 is the end view of the Meta Materials of the embodiment of negative-magnetic-permeability meta-material provided by the invention;
Fig. 3 is the schematic diagram of the microstructured layers of the embodiment of negative-magnetic-permeability meta-material provided by the invention;
Fig. 4 is the simulation result schematic diagram of Meta Materials of the prior art.
Fig. 5 is the simulation result schematic diagram of the Meta Materials of the embodiment of negative-magnetic-permeability meta-material provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1-3, the structure of the embodiment of negative-magnetic-permeability meta-material provided by the invention is described in detail.
See Fig. 1, it is the schematic diagram of the single micro-structural of the embodiment of negative-magnetic-permeability meta-material provided by the invention;
Described single micro-structural 10 comprises three wires, and described three wires are respectively metal wire 11, metal wire 12 and metal wire 13, and the length of described three wires is equal.
Metal wire 11, metal wire 12 and metal wire 13 are all L-shaped, and the angle of described L shape is 60 degree.
Metal wire 11, metal wire 12 and metal wire 13 arrange around same central rotation in the plane at microstructured layers, overlap after described metal wire 12 rotates 120 ° with metal wire 11, overlap after described metal wire 13 rotates 240 ° with metal wire 11.
Metal wire 11, metal wire 12 and metal wire 13 are copper cash, and the live width of copper cash is 0.10mm, and the thickness of copper cash is 0.018mm, and the distance between centers of tracks of copper cash is 0.10mm.
It should be noted that, the present embodiment only with the metal wire of micro-structural for copper cash, the live width of copper cash is 0.10mm, and the thickness of copper cash is 0.018mm, and the distance between centers of tracks of copper cash is 0.10mm.For example is described.In the middle of concrete enforcement, metal wire can be copper, silver, copper alloy matter and golden; Also can be nonmetallic electric conducting material, as conductive plastics etc.In micro-structural, the live width of metal wire, thickness and distance between centers of tracks can also be other numerical value.
See Fig. 2, it is the end view of the Meta Materials of the embodiment of negative-magnetic-permeability meta-material provided by the invention.
The negative-magnetic-permeability meta-material lamella 20 that the embodiment of the present invention provides comprises medium substrate 22, medium substrate 24, the microstructured layers 23 that is fixed on the microstructured layers 21 on medium substrate 22 and is fixed on medium substrate 24; Medium substrate 22, medium substrate 24 and microstructured layers 21, microstructured layers 23 are alternate stacked.
Medium substrate 22 select dielectric constant be 16 high-dielectric-constant ceramics rectangular substrate, thickness is 0.011mm, and the dielectric constant of medium substrate 22 is higher, the thinner resonance frequency of Meta Materials entirety that can make of thickness reduces.
Optionally, the dielectric constant of medium substrate 22 can be 10-20, and the thickness of medium substrate 22 can be 0.005-0.015mm.
Medium substrate 24 select dielectric constant be 7.7 polypropylene rectangular substrate, thickness is 0.139mm, the substrate that medium substrate 24 mainly selects loss less, plays protection micro-structural, reduces the effect of overall losses.
Optionally, the dielectric constant of medium substrate 24 can be 5-10, and the thickness of medium substrate 24 can be 0.10mm-0.30mm.
Optionally, medium substrate 22,24 can use FR-4 substrate, polypropylene substrate or ceramic substrate, and medium substrate 22,24 can also be circular or polygon.
It should be noted that, in the middle of concrete enforcement, a Meta Materials finished product also can be made up of multiple metamaterial sheet 20.When a Meta Materials finished product is made up of multiple metamaterial sheet 20, according to certain rule, multiple metamaterial sheet 20 can be encapsulated.When medium substrate 22,24 is tabular, each metamaterial sheet 20 is arranged in order along the direction perpendicular to medium substrate 22,24 plane, arranged in parallel between lamella, preferred parallel and spacing is equal; When medium substrate 22,24 be circular or polygon time, then can by the concyclic axle of multiple metamaterial sheet 20 install fixing.
See Fig. 3, it is the schematic diagram of the microstructured layers of the embodiment of negative-magnetic-permeability meta-material provided by the invention;
Microstructured layers 22 comprises 16 with the single micro-structural 10 of 4 × 4 matrix arrangements, and described matrix rows spacing is equal, and each column pitch of described matrix is equal.
It should be noted that, in the middle of concrete enforcement, line space, the column pitch of described matrix should be not more than 1/4th of the wavelength of the incident electromagnetic wave that will respond, the electromagnetic wave of such as operational environment to be wavelength be λ, Meta Materials is needed to be present negative magnetoconductivity to this electromagnetic electromagnetic property, the line space, the column pitch that then design matrix during the arrangement matrix of micro-structural should be not more than λ/4, are preferably λ/10.Obviously, in order to make micro-structural 10 not overlapping mutually, length and the width of each micro-structural 10 also should be not more than λ/4.
Identical with on microstructured layers 22 of micro-structural arrangement on microstructured layers 23.
It should be noted that, in the middle of concrete enforcement, periodic arrangement can also have other to have the arrangement mode of circulation law, such as when medium substrate 22,24 is circular or polygon time, micro-structural 10 is equidistantly arranged along external cylindrical surface that is circular or polygon substrate 22,24.
See Fig. 4,5, the simulated effect of the embodiment of negative-magnetic-permeability meta-material provided by the invention is described in detail.
Negative-magnetic-permeability meta-material of the prior art be directly by concave-shaped openings resonant ring array arrangement on medium substrate.For the difference of the negative-magnetic-permeability meta-material that negative-magnetic-permeability meta-material more of the prior art and the embodiment of the present invention provide, with 3 D electromagnetic field simulation software, the negative-magnetic-permeability meta-material that negative-magnetic-permeability meta-material of the prior art and the embodiment of the present invention provide is emulated, Meta Materials of the prior art is set identical with the structural parameters of the negative-magnetic-permeability meta-material that the embodiment of the present invention provides during emulation, negative magnetic conductance Meta Materials simulation result schematic diagram of the prior art is see Fig. 4, as shown in Figure 4, negative magnetic conductance Meta Materials of the prior art will realize magnetic permeability and be less than 0, its respective frequencies is at more than 400MHz, and loss is larger, the simulation result schematic diagram of the negative-magnetic-permeability meta-material that the embodiment of the present invention provides is see Fig. 5, as shown in Figure 5, the negative-magnetic-permeability meta-material that the embodiment of the present invention provides realizes the respective frequencies of negative magnetoconductivity within 150MHz, the frequency of negative magnetoconductivity is realized lower than negative magnetic conductance Meta Materials of the prior art, frequency reducing Be very effective, loss is less, and the isotropism of Meta Materials can be realized.
A kind of negative-magnetic-permeability meta-material that the embodiment of the present invention provides, described negative-magnetic-permeability meta-material comprises medium substrate and is fixed on the microstructured layers on medium substrate, and described microstructured layers comprises the single micro-structural of N number of arrangement in cyclic array; Described micro-structural have employed by three L shape metal wires at grade around the structure that same central rotation arranges, add electric capacity and the inductance of Meta Materials, under the prerequisite of negative magnetoconductivity realizing Meta Materials, effectively can reduce the resonance frequency of Meta Materials, meet the requirement to the magnetic permeability value of Meta Materials under some specific conditions; The two layer medium substrate of described negative-magnetic-permeability meta-material and two-layer microstructured layers alternately, and select the medium substrate of high-k to be clipped between two-layer micro-structural, add the electric capacity of Meta Materials, reduce further the frequency of Meta Materials; Meanwhile, comprise the microstructured layers of the single micro-structural of N number of arrangement in cyclic array, make whole Meta Materials meet isotropism, practical.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (5)
1. a negative-magnetic-permeability meta-material, is characterized in that, comprising: medium substrate and the microstructured layers be fixed on medium substrate;
Described microstructured layers comprises the single micro-structural of N number of arrangement in cyclic array, N >=1;
Described single micro-structural comprises three wires, and described three wires are respectively the first metal wire, the second metal wire and the 3rd metal wire, and the length of described three wires is equal; Every wires is all L-shaped, and the angle of described L shape is 60 degree;
Described three wires arrange around same central rotation at grade, overlap after described second metal wire rotates 120 ° with described first metal wire, overlap after described 3rd metal wire rotates 240 ° with described first metal wire.
2. a kind of negative-magnetic-permeability meta-material as claimed in claim 1, is characterized in that: described Meta Materials is laminated by two-layer described medium substrate is alternate with two-layer described microstructured layers.
3. a kind of negative-magnetic-permeability meta-material as claimed in claim 2, is characterized in that: described two layer medium substrate comprises first medium substrate and second medium substrate, and the dielectric constant of first medium substrate is 10-20, and the dielectric constant of second medium substrate is 5-10.
4. a kind of negative-magnetic-permeability meta-material as claimed in claim 3, is characterized in that: the thickness of described first medium substrate is 0.005-0.015mm.
5. a kind of negative-magnetic-permeability meta-material as claimed in claim 3, is characterized in that: the thickness of described second medium substrate is 0.10mm-0.30mm.
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| CN201410689654.XA CN104393419A (en) | 2014-11-25 | 2014-11-25 | Negative magnetic permeability meta-material |
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| CN201410689654.XA CN104393419A (en) | 2014-11-25 | 2014-11-25 | Negative magnetic permeability meta-material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958209A (en) * | 2016-07-05 | 2016-09-21 | 中国矿业大学(北京) | Double-incident type electromagnetic metamaterial structure |
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| CN102354815A (en) * | 2011-09-22 | 2012-02-15 | 中国人民解放军空军工程大学 | Broadband low-consumption left-handed material based on inclined triangular opening paired loops |
| CN102593599A (en) * | 2012-02-29 | 2012-07-18 | 深圳光启创新技术有限公司 | Negative permeability metamaterial |
| CN103296466A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Metamaterial with negative magnetic permeability, and MRI magnetic signal enhancement device |
| CN103296464A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Metamaterial with negative magnetic permeability, and MRI magnetic signal enhancement device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20110209110A1 (en) * | 2009-11-12 | 2011-08-25 | The Regents Of The University Of Michigan | Tensor Transmission-Line Metamaterials |
| CN102354815A (en) * | 2011-09-22 | 2012-02-15 | 中国人民解放军空军工程大学 | Broadband low-consumption left-handed material based on inclined triangular opening paired loops |
| CN102593599A (en) * | 2012-02-29 | 2012-07-18 | 深圳光启创新技术有限公司 | Negative permeability metamaterial |
| CN103296466A (en) * | 2012-03-01 | 2013-09-11 | 深圳光启创新技术有限公司 | Metamaterial with negative magnetic permeability, and MRI magnetic signal enhancement device |
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| CN105958209A (en) * | 2016-07-05 | 2016-09-21 | 中国矿业大学(北京) | Double-incident type electromagnetic metamaterial structure |
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Application publication date: 20150304 |