CN102593601A - Negative magnetic permeability metamaterial - Google Patents
Negative magnetic permeability metamaterial Download PDFInfo
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- CN102593601A CN102593601A CN2012100510715A CN201210051071A CN102593601A CN 102593601 A CN102593601 A CN 102593601A CN 2012100510715 A CN2012100510715 A CN 2012100510715A CN 201210051071 A CN201210051071 A CN 201210051071A CN 102593601 A CN102593601 A CN 102593601A
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- ultra material
- broken line
- negative magnetoconductivity
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- magnetic permeability
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Abstract
The invention relates to a negative magnetic permeability metamaterial comprising a dielectric substrate and artificial micro-structures fixed on the dielectric substrate. The artificial micro-structure is formed by rotating a broken line from inside to outside, the broken line is composed of line segments, and any two of the adjacent line segments form an angle of 135 degrees. With the adoption of the negative magnetic permeability metamaterial, on the premise that the negative magnetic permeability is realized, the resonance frequency of the metamaterial can be reduced below 50 MHz and the negative magnetic permeability of the metamaterial can be realized in a lower frequency range. Meanwhile, the negative magnetic permeability metamaterial is anisotropic, is of significance in the development of a metamaterial industry and has good development prospects.
Description
[technical field]
The present invention relates to ultra field of materials, relate to the ultra material of a kind of negative magnetoconductivity particularly.
[background technology]
At present, international community is to the existing a large amount of research in magnetic permeability aspect, and wherein the research for positive magnetic permeability has been tending towards ripe; Research for the ultra material of negative magnetoconductivity is the focus of studying both at home and abroad now, and negative magnetoconductivity has the quantum polarization, can produce polarization to incident wave; Therefore sphere of action is very big, and like the mr imaging technique in the medical imaging field, negative magnetic-inductive capacity material can be strengthened electromagnetic imaging effect; Negative magnetic-inductive capacity material is also playing an important role aspect the lens research in addition; In the engineering field, magnetic permeability all is meant relative permeability usually, is the 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 receives 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 finding of nature, μ is greater than 0.
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.The character of ultra 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 perhaps open annular of similar " recessed " font as shown in Figure 1 of " worker " font; But this structure all can not realize magnetic permeability μ and be significantly less than 0 or ultra material resonances frequency is significantly reduced; Have only the artificial micro-structural that has the special geometric figure through design, could make this artificial electromagnetic material in special frequency, reach magnetic permeability μ value, and have lower resonance frequency less than 0.
[summary of the invention]
Technical problem to be solved by this invention is, to the ultra material resonances frequency of negative magnetoconductivity in prior art condition with higher, more after a little while, provides a kind of and can make the ultra material of the significantly reduced negative magnetoconductivity of resonance frequency at the artificial micro-structural winding turns of ultra material.
The present invention realizes that the technical scheme that goal of the invention adopts is; Said ultra material comprises medium substrate and is fixed on the artificial micro-structural on the medium substrate; Said artificial micro-structural is rotated from inside to outside by a broken line and is formed; Said broken line is made up of line segment, and said wantonly two adjacent segments all become 135 degree angles.
In the ultra material of negative magnetoconductivity of the present invention, said line segment is no less than 16.
In the ultra material of negative magnetoconductivity of the present invention, the live width 0.05-0.15mm of said broken line.
In the ultra material of negative magnetoconductivity of the present invention, the distance between centers of tracks 0.05-0.15mm of said broken line.
In the ultra material of negative magnetoconductivity of the present invention, the thickness 0.015-0.020mm of said broken line.
In the ultra material of negative magnetoconductivity of the present invention, the medium substrate of said ultra material is FR-4 substrate or ceramic substrate.
In the ultra material of negative magnetoconductivity of the present invention, the dielectric constant of said FR-4 substrate is 4.2-4.6, and the dielectric constant of said ceramic substrate is 8-16.
In the ultra material of negative magnetoconductivity of the present invention, said medium substrate is divided into a plurality of identical cube medium substrate unit, is attached with an artificial micro-structural on each unit.
In the ultra material of negative magnetoconductivity of the present invention, said medium substrate unit is along the vertical x of pairwise orthogonal, y, three direction array arrangements of z.
Beneficial effect of the present invention is, artificial micro-structural is that a broken line rotates from inside to outside and forms, and said broken line is made up of line segment, and said wantonly two adjacent segments all become 135 degree angles.The sign structure of broken line length can equivalence be an inductance, and two relative line segments can equivalence be electric capacity on the broken line, and broken line length increases; Then inductance increases, and electric capacity increases, and the resonance frequency that ultra material is corresponding will reduce; Even under the less situation of artificial micro-structural winding turns; Can the resonance frequency that surpass material be dropped to below the 50MHz, can know that according to the shape of above-mentioned artificial micro-structural the present invention is ultra, and material is anisotropic.The present invention has bright development prospect.
[description of drawings]
Fig. 1, the existing artificial micro-structural sketch map of the ultra material of negative magnetoconductivity;
Fig. 2, the ultra material sketch map of the preferred embodiment of the present invention;
Fig. 3, the ultra material cell sketch map of the preferred embodiment of the present invention;
Fig. 4, the artificial micro-structural sketch map of the preferred embodiment of the present invention;
Fig. 5, the magnetic permeability simulated effect sketch map of the existing ultra material of negative magnetoconductivity;
Fig. 6, the magnetic permeability simulated effect sketch map of the preferred embodiment of the present invention;
Among the figure, 1 artificial micro-structural, 2 medium substrates, 3 medium substrate unit, 10 surpass material cell.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
The present invention provides a kind of negative magnetoconductivity ultra material; As shown in Figure 2, comprise medium substrate 2 and be fixed on the artificial micro-structural 1 on the medium substrate that artificial micro-structural 1 is rotated from inside to outside by a broken line and formed; This broken line is made up of line segment; Wantonly two adjacent segments all become 135 degree angles, and the sketch map of the artificial micro-structural 1 of the present invention is referring to Fig. 4, and the micro-structural of this shape can make ultra material be anisotropy.
The medium substrate 2 of the ultra material of negative magnetoconductivity of the present invention can be by the virtual identical a plurality of cube shaped medium substrates unit 3 that is divided into; It is that row, y direction are that row, z direction are the array that stacked direction is formed with the x direction that medium substrate 2 can be regarded as by a plurality of such medium substrate unit 3, and wherein x, y, z direction pairwise orthogonal are vertical.Medium substrate 2 can be by FR-4, F4b, and CEM1, CEM3 and TP-1 ceramic material constitute, if use the substrate of FR-4 grade, its dielectric constant is 4.2-4.6, if use ceramic substrate, its dielectric constant is 8-16.The medium substrate of the ultra material of embodiment of the invention negative magnetoconductivity is selected the epoxy resin base plate of FR-4 grade for use, and dielectric constant is 4.4, and thickness is 0.4mm.
Be fixed with an artificial micro-structural 1 on each medium substrate unit 3; The ultra material cell 10 of artificial micro-structural 1 common formation on medium substrate unit 3 and the medium substrate unit 3; As shown in Figure 3, so the present invention can be regarded as by a plurality of ultra material cell 10 and forms along x, y, three direction array arrangements of z.
Artificial micro-structural 1 is generally the metal broken line, like copper cash, silver-colored line, copper alloy, or even gold thread; Also can be by at least two kinds of metal alloys; Or even nonmetallic electric conducting material, like conductive plastics, ITO (indium tin oxide), CNT, graphite etc., the live width of metal broken line is controlled at 0.05-0.15mm; The distance between centers of tracks of metal broken line is controlled at 0.05-0.15mm, and the THICKNESS CONTROL of metal broken line is at 0.015-0.020mm.The artificial micro-structural of the present invention all has response to magnetic field; And its over against two broken lines between the distance between centers of tracks d that walks equate; Minimum can be accomplished 0.1mm; Prior art is generally the split ring resonator structure to the artificial micro-structural of magnetic responsiveness, and is as shown in Figure 1, and this structure is to be similar to unsealed " recessed " font micro-structural.
To combine accompanying drawing below, the principle of compositionality and the beneficial effect of the ultra material of negative magnetoconductivity of the embodiment of the invention elaborated.
Artificial micro-structural 1 is on the surface of medium substrate 2 periodically arranges; For example rectangular array is arranged; Promptly be row, serve as that row ground is arranged, and each line space, each column pitch equate respectively, even line space equals column pitch and all can with y direction perpendicular to the x direction with an x direction.Preferred line space, column pitch be not more than the incident electromagnetic wave that will respond wavelength 1/4th; Promptly for example operational environment is that wavelength is the electromagnetic wave of λ; Needing ultra material is to present negative magnetoconductivity to this electromagnetic electromagnetic property; When then designing artificial micro-structural above-mentioned line space, column pitch are selected to be not more than λ/4, be preferably λ/10.Obviously, do not overlap 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/4.Periodically arranging to have other to have the arrangement mode of circulation law; For example when medium substrate 2 is circle or polygon; Equally spacedly around a week, the medium substrate 2 of the ultra material of the embodiment of the invention is a rectangle to artificial micro-structural 1, referring to Fig. 2 along the external cylindrical surface of circle or polygon substrate 2.
The present invention realizes that the principle of negative magnetoconductivity does, for micro-structural of the present invention, can equivalence be the LC oscillating circuit; Whole broken line can equivalence be the electric capacity that a pole plate length approximates the broken line total length, per two sections pole plates that are equivalent to electric capacity mutually over against broken line, and it can equivalence be inductance that broken line length characterizes structure; Find through emulation; Under the immovable situation of other conditions, copper cash is long more, and then the equivalent inductance value of structure, capacitance are big more.
can know by LC oscillating circuit formula; When inductance value, capacitance all increased, its corresponding resonance frequency then reduced.
Prior art be directly with shown in Figure 1 not sealing " recessed " shape split ring resonator array arrangement on medium substrate; Process ultra material, the present invention be with a broken line from any outwards equidistantly spiral, form artificial micro-structural; Be the relatively difference of prior art and the ultra material property of negative magnetoconductivity of the present invention; With CST ultra material of prior art negative magnetoconductivity and the ultra material of preferred embodiment of the present invention negative magnetoconductivity have been carried out emulation respectively, the structural parameters of setting the ultra material of ultra material and the embodiment of the invention in the prior art during emulation are identical, and the concrete structure parameter of the embodiment of the invention is following in the simulation process: copper cash live width 0.1mm; Copper cash distance between centers of tracks 0.1mm; Coiling 17 circles, copper cash thickness 0.018mm, FR-4 grade epoxy resin-matrix 3 plate thickness are 0.4mm; Dielectric constant 4.4, the artificial micro-structural 1 of ultra material is of a size of 15mm * 15mm.The magnetic permeability of the existing negative ultra material of magnetic conductance referring to Fig. 5, can be known that prior art will realize that magnetic permeability is less than 0 about the electromagnetic response curve of frequency by Fig. 5; Its respective frequencies is more than 400MHz, and loss is bigger, and magnetic permeability simulated effect sketch map of the present invention is referring to Fig. 6; Can know by Fig. 6; The respective frequencies that ultra material of the present invention is realized negative magnetoconductivity is significantly less than the frequency that the ultra material of prior art is realized negative magnetoconductivity about 47.5MHz, the frequency reducing effect is remarkable.
Superior part of the present invention is, designs a kind of brand-new artificial micro-structural 1, like Fig. 2, shown in Figure 3; Artificial micro-structural 1 is rotated from inside to outside by a broken line and is formed, and this broken line is made up of line segment, and wantonly two adjacent segments all become 135 degree angles; The ultra material of the present invention can not only realize that magnetic permeability is negative, and can be with less winding turns; Resonance frequency is dropped to below the 50MHz, and the ultra material of this novel low-frequency negative magnetoconductivity is for the development of ultra material industry, and is significant.
The foregoing description 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 (9)
1. ultra material of negative magnetoconductivity; Said ultra material comprises medium substrate and is fixed on the artificial micro-structural on the medium substrate; It is characterized in that; Said artificial micro-structural is rotated from inside to outside by a broken line and is formed, and said broken line is made up of line segment, and said wantonly two adjacent segments all become 135 degree angles.
2. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that said line segment is no less than 16.
3. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that the live width 0.05-0.15mm of said broken line.
4. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that, the distance between centers of tracks 0.05-0.15mm of said broken line.
5. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that, the thickness 0.015-0.020mm of said broken line.
6. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that the medium substrate of said ultra material is FR-4 substrate or ceramic substrate.
7. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that the dielectric constant of said FR-4 substrate is 4.2-4.6, and the dielectric constant of said ceramic substrate is 8-16.
8. the ultra material of negative magnetoconductivity according to claim 1 is characterized in that, said medium substrate is divided into a plurality of identical cube medium substrate unit, is attached with an artificial micro-structural on each unit.
9. the ultra material of negative magnetoconductivity according to claim 8 is characterized in that, said medium substrate unit is along the vertical x of pairwise orthogonal, y, three direction array arrangements of z.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100510715A CN102593601A (en) | 2012-02-29 | 2012-02-29 | Negative magnetic permeability metamaterial |
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| CN2012100510715A CN102593601A (en) | 2012-02-29 | 2012-02-29 | Negative magnetic permeability metamaterial |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780086A (en) * | 2012-07-31 | 2012-11-14 | 电子科技大学 | Novel dual-frequency patch antenna with resonance ring microstructure array |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202094299U (en) * | 2011-06-01 | 2011-12-28 | 深圳光启高等理工研究院 | Antenna and MIMO antenna comprising same |
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2012
- 2012-02-29 CN CN2012100510715A patent/CN102593601A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202094299U (en) * | 2011-06-01 | 2011-12-28 | 深圳光启高等理工研究院 | Antenna and MIMO antenna comprising same |
Non-Patent Citations (1)
| Title |
|---|
| 张富利: "结构单元与左手材料性能关系研究", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780086A (en) * | 2012-07-31 | 2012-11-14 | 电子科技大学 | Novel dual-frequency patch antenna with resonance ring microstructure array |
| CN102780086B (en) * | 2012-07-31 | 2015-02-11 | 电子科技大学 | Novel dual-frequency patch antenna with resonance ring microstructure array |
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Application publication date: 20120718 |