CN103296464A - Metamaterial with negative magnetic permeability, and MRI magnetic signal enhancement device - Google Patents
Metamaterial with negative magnetic permeability, and MRI magnetic signal enhancement device Download PDFInfo
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- CN103296464A CN103296464A CN2012100520740A CN201210052074A CN103296464A CN 103296464 A CN103296464 A CN 103296464A CN 2012100520740 A CN2012100520740 A CN 2012100520740A CN 201210052074 A CN201210052074 A CN 201210052074A CN 103296464 A CN103296464 A CN 103296464A
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Abstract
The invention relates to a metamaterial with negative magnetic permeability, and an MRI magnetic signal enhancement device. The metamaterial with the negative magnetic permeability comprises a substrate and an artificial microstructure layer fixed on the substrate. The artificial microstructure layer is composed of a plurality of artificial microstructures arranged in a periodicity array mode. Each artificial microstructure is a triangular spiral winding ring which is formed by a folding line made of a conductive material in an equal-interval inlaid sleeving mode. When the metamaterial with the negative magnetic permeability is adopted, the resonant frequency of a metamaterial when the magnetic permeability of the metamaterial is negative can be effectively reduced, the requirement for a negative magnetic permeability value under some special conditions is met, and the negative magnetic permeability metamaterial is in anisotropism. In addition, the metamaterial with the negative magnetic permeability can be well applied to the MRI magnetic signal enhancement device. The metamaterial with the negative magnetic permeability, and the MRI magnetic signal enhancement device have important significance on development of the metamaterial industry.
Description
[technical field]
The present invention relates to super material field, relate to the super material of a kind of negative magnetoconductivity and MRI magnetic signal enhance device particularly.
[background technology]
At present, international community is to the existing a large amount of research in magnetic permeability aspect, wherein the research for positive magnetic permeability has been tending towards ripe, research for the super material of negative magnetoconductivity is the focus of studying both at home and abroad now, negative magnetoconductivity has the quantum polarization, can produce polarization to incident wave, therefore sphere of action is very big, as the mr imaging technique in the medical imaging field, negative magnetic-inductive capacity material can be strengthened electromagnetic imaging effect, and negative magnetic-inductive capacity material is also playing an important role aspect the lens research in addition, in the engineering field, magnetic permeability all refers to relative permeability usually, is absolute permeability μ and the magnetic constant μ of material
0The ratio of (claiming permeability of vacuum again), μ
r=μ/μ
0, dimensionless number.Usually " relatively " two words and symbol subscript r are removed.Magnetic permeability is to represent that material is subjected to magnetizing field H and does the time spent, and inner true magnetic field is with respect to the degree of increase (μ＞1) or the minimizing (μ＜1) of H.So far in the already present material of the nature of Fa Xianing, μ is greater than 0.
The principle of nulcear magnetic resonance (NMR) (MRI) imaging system is to utilize coil to remove to detect the radio wave pulses energy that nuclear spin absorbs and launches, and this coil is being gone back simultaneously as transmitting coil sometimes as receiving coil.Under the help of radio wave pulses energy, the Magnetic resonance imaging scanner can the position patient body in a very little point, determine that then this is the tissue of which kind of type.The magnetic resonance imaging machine device adopts the radio frequency pulse specific to hydrogen atom.System's pilot pulse is aimed at the body region that will check, and causes this regional proton absorption to make them with different directions rotation or the required energy of precession.This is NMR imaging device " resonance " part.Radio frequency pulse forces their (referring to a pair of or two pairs of unmatched protons unnecessary in each 1,000,000 proton) to be rotated according to specific direction under characteristic frequency.The characteristic frequency that causes resonance is called as Rameau that frequency, and this value is to calculate according to the magnetic field intensity of the particular organization that wants imaging and main field to draw.Radio frequency pulse utilizes a coil to provide usually, and this coil is called transmitting coil.
Super material refers to artificial composite structure or the composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design by 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.The character of super material and function mainly come from its inner structure but not constitute their material.At present, the geometry of existing artificial micro-structural is the open annular of " worker " font or similar " recessed " font as shown in Figure 1, but this structure all can not realize magnetic permeability μ and be significantly less than 0 or super material resonances frequency is reduced, can not realize isotropism, has only the artificial micro-structural that has the special geometric figure by design, could make this artificial electromagnetic material in special frequency channel, reach magnetic permeability μ value less than 0, and have lower resonance frequency.
[summary of the invention]
Technical problem to be solved by this invention is, at the super material resonances frequency of negative magnetoconductivity in prior art condition with higher, provides a kind of resonance frequency the lower super material of anisotropy negative magnetoconductivity.In addition, the present invention has bigger application for the MRI imaging device provides in a kind of magnetic signal enhance device.
The present invention realizes that the technical scheme that goal of the invention adopts is, the super material of a kind of negative magnetoconductivity, described super material comprises substrate and is fixed on artificial microstructured layers on the substrate, the artificial micro-structural that described artificial microstructured layers is arranged by a plurality of cyclic arrays is formed, and described artificial micro-structural is by the equidistant nested triangle torus that forms of the broken line of an electric conducting material.
Preferably, adjacent two sections electric conducting material broken line angles of described triangle torus are 60 °.
Preferably, the thickness of described substrate is 0.20mm-0.60mm.
Preferably, the dielectric constant of described substrate is 4-8.
Preferably, the broken line live width of described electric conducting material is 0.05-0.15mm.
Preferably, the broken line distance between centers of tracks of described electric conducting material is 0.05-0.15mm.
Preferably, the broken line thickness of described electric conducting material is 0.015-0.020mm.
Preferably, the fold line cross-section of described electric conducting material is rectangle or circle.
Preferably, the nested number of plies of the broken line of described electric conducting material is greater than 2.
A kind of MRI magnetic signal enhance device is arranged between the magnetic signal receiving coil of detected part and MRI equipment, and described MRI magnetic signal enhance device is super material, and described super material has negative magnetoconductivity under the magnetic signal operating frequency of MRI equipment.
Preferably, described super material is the super material of above-described negative magnetoconductivity.
Beneficial effect of the present invention is, the artificial micro-structural of triangle torus that equidistantly is nested to form by the broken line of an electric conducting material, the artificial micro-structural of this multiple coiling has been equivalent to increase electric capacity and the inductance of super material, by increasing electric capacity and inductance, reduces the resonance frequency of super material.The present invention can be applied in the magnetic signal enhance device, the magnetic signal enhance device utilizes the magnetic permeability of the super material of negative magnetoconductivity to be negative this characteristic, reach the effect that signal strengthens, reduce the frequency of the super material of negative magnetoconductivity, be in order to obtain more the operating frequency near MRI equipment, make MRI equipment imaging effect better, reduce the cost of MRI imaging device.
[description of drawings]
Fig. 1, the artificial micro-structural schematic diagram of the super material of existing negative magnetoconductivity;
Fig. 2, preferred embodiment of the present invention metamaterial structure schematic diagram;
Fig. 3, the artificial micro-structural schematic diagram of the super material of the preferred embodiment of the present invention;
Fig. 4, the artificial micro-structural polar coordinates of preferred embodiment of the present invention schematic diagram;
Fig. 5, the super material magnetic permeability of preferred embodiment of the present invention simulated effect schematic diagram;
Among the figure, 1 artificial micro-structural, 2 substrates.
[embodiment]
The present invention is described in detail below in conjunction with drawings and Examples.
The invention provides the super material of a kind of negative magnetoconductivity, as shown in Figure 2, comprise substrate 2 and be fixed on artificial microstructured layers on the substrate, the periodic a plurality of artificial micro-structurals 1 of array arrangement on the artificial microstructured layers, artificial micro-structural 1 is that preferred two neighboring sections electric conducting material broken line angle is 60 ° by the equidistant nested triangle torus that forms of an electric conducting material broken line.
Below in conjunction with accompanying drawing, principle of compositionality and the beneficial effect of the super material of negative magnetoconductivity of the embodiment of the invention elaborated.
Artificial micro-structural 1 is on substrate 2 surfaces periodically arranges, and for example rectangular array is arranged, and namely be row, serve as that row ground is arranged with the y direction perpendicular to the x direction with an x direction, and each line space, each column pitch are equal respectively, even line space equals column pitch and all can.Preferred line space, column pitch be not more than the incident electromagnetic wave that will respond wavelength 1/5th, namely for example operational environment is that wavelength is the electromagnetic wave of λ, needing super material is to present negative magnetoconductivity to this electromagnetic electromagnetic property, when then designing artificial micro-structural above line spacing, column pitch are selected to be not more than λ/5, be preferably λ/10.Obviously, not overlapping mutually in order to make artificial micro-structural 1, the length of each artificial micro-structural 1 and width also are not more than λ/5.Periodically arranging to have other arrangement modes with circulation law, for example when substrate 2 is circle or polygon, artificial micro-structural 1 along the external cylindrical surface of circle or polygon substrate 2 equally spacedly around a week.The substrate 2 of the preferred embodiment of the present invention is rectangle, referring to Fig. 2.
When super material layer has when a plurality of, can they be encapsulated according to certain rules, for example when substrate 2 is tabular, each super material layer is arranged in order along the direction perpendicular to substrate 2 surfaces, be arranged in parallel between layer and the layer, preferred parallel and spacing equate, when substrate 2 is above-mentioned circle or polygon, then can with the concyclic axle of a plurality of super material layers install and fix.
The super material substrate 2 of negative magnetoconductivity of the present invention can use substrate to be high-molecular organic material or ceramic material.The thickness of substrate 2 is 0.20mm-0.60mm, and the dielectric constant of substrate 2 is 4-8.The super material substrate 2 of the preferred embodiment of the present invention is selected the epoxy resin base plate of FR-4 grade for use, and thickness is 0.40mm, and dielectric constant is 4.4.
The artificial micro-structural 1 of the present invention as shown in Figure 3, be by the equidistant nested triangle torus that forms of an electric conducting material broken line, adjacent two sections conduction broken line angles of preferred triangle torus are 60 °, the conduction broken line can be selected copper cash, silver-colored line, copper alloy for use, or even gold thread, or nonmetallic electric conducting material, as conductive plastics etc., the cross section of conduction broken line is rectangle or circle, and the nested number of plies of conduction broken line is greater than 2.The live width of conduction broken line is 0.05-0.15mm, and the thickness of conduction broken line is 0.015-0.020mm, and the distance between centers of tracks of conduction broken line is 0.05-0.15mm.The artificial micro-structural of the super material of the embodiment of the invention is used 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, and the overall dimensions of super material is 15mm * 15mm, and the nested number of turns of copper cash is 9 circles.
A circle herein refers to as shown in Figure 4, a bit is polar limit O with ring-shaped inner part that the triangle torus was surrounded
e, encircle in two distal points from limit O
eNear distal point line to the extreme is this polar pole axis, and getting is positive direction counterclockwise, then uses polar coordinates (ρ successively along the every bit on the split ring resonator
e, represent that θ) every one 360 degree is a circle, up to another distal point away from the limit that reaches the triangle torus.
The present invention realizes that the principle of negative magnetoconductivity is, for triangle torus micro-structural, can equivalence be the LC oscillating circuit, the copper cash equivalence is inductance L, and the coupling capacitance equivalent capacity C between line capacitance, the triangle torus finds by emulation, under the immovable situation of other conditions, copper cash is more long, and distance between centers of tracks is more near, and then equivalent capacitance value C is more big.
In like manner we can judge the variation of inductance L qualitatively, and the copper cash line length is more long, and inductance L is more big.The copper cash winding turns of microstructure unit is more many among the present invention, its inductance more big (having mutual inductance).
By LC oscillating circuit formula
As can be known, when inductance value increased, its corresponding resonance frequency then reduced.
Prior art be directly with " spill " shown in Figure 1 split ring resonator array arrangement on substrate, make super material, the present invention is by an equidistant nested triangle torus that forms of conduction broken line, this artificial micro-structural not only can effectively reduce the resonance frequency of super material, can also make super material be anisotropy.
The super material of negative magnetoconductivity with the CST embodiment of the invention carries out emulation, the structural parameters of emulation are, copper cash live width 0.1mm, copper cash distance between centers of tracks 0.1mm, coiling 9 circles, copper cash thickness 0.018mm, substrate 2 thickness are 0.4mm, substrate 2 dielectric constants are 4.4, the size 15mm of artificial micro-structural 1 * 15mm, the simulation result schematic diagram is referring to Fig. 5, as shown in Figure 5, the super material realization of the present invention magnetic permeability is about 210MHz for-1 respective frequencies, the frequency reducing effect is remarkable, and loss is less, can make super material be anisotropy, for the development of super material industry, significant.
The super material of negative magnetoconductivity according to the present invention, can prepare a kind of MRI magnetic signal enhance device: in MRI equipment, MRI magnetic signal enhance device is arranged between the magnetic signal receiving coil of detected part and MRI equipment, MRI magnetic signal enhance device is the super material of negative magnetoconductivity of the present invention, the super material of the present invention has negative magnetoconductivity under the magnetic signal operating frequency of MRI equipment, the resonance frequency of the super material of negative magnetoconductivity can strengthen its signal strength signal intensity at the magnetic signal working frequency range, and then the image quality of Contrast-enhanced MRI equipment, reduce the production cost of MRI imaging device, have bright development prospect.
Above-described embodiment among the present invention has only been done exemplary description, and those skilled in the art can carry out various modifications to the present invention under the situation that does not break away from the spirit and scope of the present invention after reading present patent application.
Claims (12)
1. super material of negative magnetoconductivity, described super material comprises substrate and is fixed on artificial microstructured layers on the substrate, it is characterized in that, the artificial micro-structural that described artificial microstructured layers is arranged by a plurality of cyclic arrays is formed, and described artificial micro-structural is by the equidistant nested triangle torus that forms of the broken line of an electric conducting material.
2. the super material of negative magnetoconductivity according to claim 1 is characterized in that, adjacent two sections electric conducting material broken line angles of described triangle torus are 60 °.
3. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the thickness of described substrate is 0.20mm-0.60mm.
4. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the dielectric constant of described substrate is 4-8.
5. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the broken line live width of described electric conducting material is 0.05-0.15mm.
6. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the broken line distance between centers of tracks of described electric conducting material is 0.05-0.15mm.
7. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the broken line thickness of described electric conducting material is 0.015-0.020mm.
8. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the fold line cross-section of described electric conducting material is rectangle or circle.
9. the super material of negative magnetoconductivity according to claim 1 is characterized in that, the nested number of plies of the broken line of described electric conducting material is greater than 2.
10. the super material of negative magnetoconductivity according to claim 1 is characterized in that, described substrate is high-molecular organic material or ceramic material.
11. MRI magnetic signal enhance device, be arranged between the magnetic signal receiving coil of detected part and MRI equipment, it is characterized in that described MRI magnetic signal enhance device is super material, described super material has negative magnetoconductivity under the magnetic signal operating frequency of MRI equipment.
12. MRI magnetic signal enhance device according to claim 11 is characterized in that, described super material is the super material of the arbitrary described negative magnetoconductivity of claim 1 to 10.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393419A (en) * | 2014-11-25 | 2015-03-04 | 张永超 | Negative magnetic permeability meta-material |
| CN109071137A (en) * | 2016-07-06 | 2018-12-21 | 惠普发展公司，有限责任合伙企业 | Detector with triangle inductor coil |
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| CN1874066A (en) * | 2005-05-31 | 2006-12-06 | 西北工业大学 | Microstrip antenna with open-ended resonance ring(SRRs) |
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| CN1428017A (en) * | 2000-03-06 | 2003-07-02 | 马科尼光学元件有限公司 | Structure with switchable magnetic properties |
| US20100141358A1 (en) * | 2005-01-18 | 2010-06-10 | University Of Massachusetts Lowell | Chiral Metamaterials |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393419A (en) * | 2014-11-25 | 2015-03-04 | 张永超 | Negative magnetic permeability meta-material |
| CN109071137A (en) * | 2016-07-06 | 2018-12-21 | 惠普发展公司，有限责任合伙企业 | Detector with triangle inductor coil |
| US11078038B2 (en) | 2016-07-06 | 2021-08-03 | Hewlett-Packard Development Company, L.P. | Detector with triangle-shaped inductor coils |
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Application publication date: 20130911 |