CN105119058A - Rotary left-handed material unit structure with multi-resonant control structure - Google Patents
Rotary left-handed material unit structure with multi-resonant control structure Download PDFInfo
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- CN105119058A CN105119058A CN201510454641.9A CN201510454641A CN105119058A CN 105119058 A CN105119058 A CN 105119058A CN 201510454641 A CN201510454641 A CN 201510454641A CN 105119058 A CN105119058 A CN 105119058A
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Abstract
The invention relates to left-handed materials and specifically relates to a rotary left-handed material unit structure with a multi-resonant control structure. The rotary left-handed material unit structure is provided with a microwave dielectric material substrate and a metal layer structure. The metal layer structure is coated on one side of the microwave dielectric substrate. The metal layer structure comprises four identical rotary helical structures and one cross structure and is formed in a way that the four identical rotary helical structures are loaded on the one cross structure in a quadruple rotary symmetric way. Each rotary helical structure comprises at least three straightway type metal straps. Each straightway type metal strap is serially connected along a counterclockwise direction and adjacent straightway type metal straps are vertically connected. The longest straightway type metal strap is vertically connected with one end of the cross structure. By adopting a quadruple rotary symmetric means, the rotary left-handed material unit structure prevents chiral effects and further makes it convenient to load an electromagnetic resonance control structure through its clear structure.
Description
Technical field
The present invention relates to a kind of left-handed materials, especially relate to a kind of jatharapanvartanasana left-handed materials cellular construction with multi-resonant control structure.
Background technology
Left-handed materials is the non-existent artificial cycle structure of a kind of occurring in nature, and its dielectric constant and magnetic permeability are all negative, electric field
magnetic field
and wave vector
defer to left hand helix law.In 1967, former Soviet Union physicist V.G.Veselago did theoretical research to left-handed materials first, doped the characteristic that left-handed materials can present many novelties, as inverse Doppler effect, inverse Cherenkov effect, negative refraction etc. [1].But because occurring in nature cannot find natural left-handed materials always, left-handed materials research field never substantial breakthrough development in nearly 30 years thereafter.Until 1996, the thin wire array that the people such as British scientist J.B.Pendry propose periodic arrangement can show negative permittivity effect in microwave band, and this is that left-handed materials solves a critical problem [2] in the physics realization of microwave band.1999, Pendry proposes again, the split ring resonator array (SRR) of cycle placement can substitute magnetic material and show negative magnetoconductivity effect in microwave band, and this classical works is almost for the physics realization of left-handed materials opens gate [3].Finally, 2000 and calendar year 2001, the scholars such as the D.R.Smith of the U.S. are based on the result of study of Pendry, by by above-mentioned thin wire array and SRR array rational deployment, design respectively and processed first piece of one dimension left-handed materials and first piece of two-dimensional left-handed material in history, and having observed negative refraction [4].2002, the Itoh of California, USA university and the G.V.Eleftheriades of University of Toronto almost proposed an other class left-handed materials simultaneously, namely realized composite left-and-right-hand structure [5] with transmission line structure.2005, the computer MSR Information system of D.R.Smith leader, based on S parameter method, carried out leaching process discussion [6] to electromagnetic parameters such as the refractive index of the two negative material of periodic structure, magnetic permeability and dielectric constants.So far after, people have dropped into increasing interest to left-handed materials, and increasing scholar expands more deep research to it, particularly in its new structure and new application.At present, various countries' research work group have devised the left-handed materials of many configurations, such as S type structure [7], Ω type structure [8], fishing net structure [9], dendritic structure [10], spiral ring type structure [11] etc., and these left-handed materials have been widely applied to the fields such as optics [12], acoustics [13], medical science [14], electromagnetism [15].
List of references:
[1]V.G.Veselago.Theelectrodynamicsofsubstanceswithsimultaneouslynegativevaluesofεandμ[J].Physics-Uspekhi,1968,10(4):509-514.
[2]PendryJB,HoldenAJ,StewartWJ,etal.Extremelylowfrequencyplasmonsinmetallicmesostructures[J].Physicalreviewletters,1996,76(25):4773.
[3]PendryJB,HoldenAJ,RobbinsDJ,etal.Magnetismfromconductorsandenhancednonlinearphenomena[J].MicrowaveTheoryandTechniques,IEEETransactionson,1999,47(11):2075-2084.
[4]SmithDR,PadillaWJ,VierDC,etal.Compositemediumwithsimultaneouslynegativepermeabilityandpermittivity[J].Physicalreviewletters,2000,84(18):4184.
[5]G.V.Eletlheriades,A.K.Lyer,P.C.Kremer.PlanarnegativerefractiveindexmediausingperiodicallyL-Cloadedtransmissionlines[J].IEEETransactionsonMicrowaveTheoryandTechniques,2000,50(12):2702-2712.
[6]D.R.Smith,D.C.Vier,Th.Koschny.Impactofinherentperiodicstructureoneffectivemediumdescriptionofleft-handed[J].PhysicalReviewLetters,2005.
[7]H.Chen,L.Ran,J.Huangfu,etal."Left-handedmaterialscomposedofonlyS-shapedresonators,"PhysicalReviewE,2004,70(5):057605.
[8]F.Zhang,G.Houzet,E.Lheurette,etal."Negative-zero-positivemetamaterialwithomega-typemetalinclusions,"JournalofAppliedPhysics,2008.103:084312.
[9]V.D.Lam,J.B.Kim,S.J.Lee,etal."Left-handedbehaviorofcombinedandfishnetstructures,"JournalofAppliedPhysics,2008,103(3):033107-033107-4.
[10]ZhangBSLCR,Xiao-PengYPZ.Broadbandmetamaterialabsorberbasedondendriticstructure[J].ActaPhysicaSinica,2010,5:042.
[11]PendryJB.Achiralroutetonegativerefraction[J].Science,2004,306(5700):1353-1355.
[12]ValentineJ,ZhangS,ZentgrafT,etal.Three-dimensionalopticalmetamaterialwithanegativerefractiveindex[J].nature,2008,455(7211):376-379.
[13]HuW,FanY,JiP,etal.Anexperimentalacousticcloakforgeneratingvirtualimages[J].JournalofAppliedPhysics,2013,113(2):024911-024911-4.
[14]LagarkovAN,KisselVN.Near-perfectimaginginafocusingsystembasedonaleft-handed-materialplate[J].Physicalreviewletters,2004,92(7):077401-077401.
[15]EnkrichC,WegenerM,LindenS,etal.Magneticmetamaterialsattelecommunicationandvisiblefrequencies[J].Physicalreviewletters,2005,95(20):203901.
Summary of the invention
The object of the present invention is to provide a kind of jatharapanvartanasana left-handed materials cellular construction realizing band multi-resonant control structure to left-handed materials electrical characteristics final regulation and control.
For achieving the above object, the present invention adopts following technical scheme:
With the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure, be provided with microwave dielectric material substrate and metal-layer structure, metal-layer structure is coated in microwave-medium substrate side;
Metal-layer structure comprises 4 identical jatharapanvartanasana helical structures and 1 decussate texture, to be carried on 1 decussate texture with quadruple rotational-symmetric form by 4 identical jatharapanvartanasana helical structures and to be formed, described jatharapanvartanasana helical structure comprises at least 3 straight line segmentation metal tapes, each bar straight line segmentation metal tape is by counterclockwise contacting, and vertically connect between adjacent straight line segment formula metal tape, wherein the longest straight line segmentation metal tape is connected with one end of decussate texture is vertical.
The dielectric constant of described microwave dielectric material substrate can be 2.2 ~ 8.0.
The shape of described microwave dielectric material substrate is preferably square, length of side L=12 ~ 20mm, thickness h=0.18 ~ 0.32mm.
Described jatharapanvartanasana helical structure by 4 straight line segmentation metal tapes by counterclockwise contacting, and vertically can connect between adjacent straight line segment formula metal tape; The length of 4 strip metal bands can be b1=5.0 ~ 6.4mm successively, b2=4.8 ~ 6.0mm, b3=4.8 ~ 6.0mm, b4=3.5 ~ 4.5mm, width w=0.55 ~ 0.65mm; The size of described cross metal tape can be: long limit L=12 ~ 20mm, minor face a=9.0 ~ 15mm, width w=0.55 ~ 0.65mm.
Described metal level can be layers of copper, and copper layer thickness can be 0.015 ~ 0.025mm.
Described jatharapanvartanasana helical structure can by 7 straight line segmentation metal tapes by counterclockwise series winding, and adjacent between vertically connect.
Described jatharapanvartanasana helical structure can by 5 straight line segmentation metal tapes by counterclockwise arrangement, and vertically connect between front 4 straight line segmentation metal tapes are adjacent, 1 straight line segmentation metal tape of afterbody is vertical with adjacent straight line segment formula metal tape leaves spacing.
Described jatharapanvartanasana helical structure can be made up of 3 straight line segmentation metal tapes and 1 metal disk, each straight line segmentation metal tape by counterclockwise series winding, and adjacent between vertically connect; Metal disk is connected with the straight line segmentation metal tape inner surface being in afterbody.
Compared with existing left-handed materials, the present invention has following outstanding advantage and significant effect:
For described jatharapanvartanasana left-handed materials cellular construction, the rotational symmetric form of quadruple is avoiding while Chiral Effects produces, its clearly structure give and load further electromagnetic resonance control structure and provide conveniently.Be prepared in the one side of high performance microwave dielectric material substrate, can make the making of material produce and later stage load application more convenient.
After electromagnetic wave incident, in cellular construction, the metal Coupling cross bar of horizontal positioned makes the current loop forming multiple coupling in structure, two helical structures simultaneously on this structure diagonal angle also can form " S " type resonant element, electric current not only can be coupled between the upper and lower two parts of cellular construction, also can be coupled in two of a diagonal angle connected helical structure.The existence of multiple current loop and electromagnetic coupled makes this construction unit, in two different frequencies, electromagnetic resonance occur, thus realizes left-handedness effect on two different frequency ranges.
And load all kinds of electromagnetic resonance control structure at cellular construction end, as directly connected or the conductor belt of indirect coupling, disk, after frame, negative index, negative permittivity and negative magnetoconductivity can be produced near above-mentioned two frequencies equally simultaneously.Using the pattern of the electromagnetic resonance control structure of loading, size, connected mode as regulatable variable, these variablees are all the key factors affecting left-handed materials effective electromagnetic parameter, by regulating these variablees, the equivalent capacity of left-handed materials cellular construction, equivalent inductance, equivalent electric length, coupling coefficient etc. can be changed, thus realize left-handed materials electrical characteristics, similarly be the final regulation and control of frequency, bandwidth.
Cellular construction of the present invention devises a kind of jatharapanvartanasana left-handed materials, its cellular construction of the left-handed materials of this structure is because of when electromagnetic wave incident, inside can produce multiple current loop, by means of different electromagnetic coupled modes, can achieve two different frequency ranges produce negative index, negative permittivity and negative magnetoconductivity (i.e. left-handedness effect) simultaneously near 1.9GHz and 2.8GHz; Then by loading electromagnetic resonance control structure at its structure end, the parameter such as pattern, size, connected mode of the added resonance control structure of adjustment can the resonance frequency of tuning controling unit structure and resonant intensity, thus change flexibly produce left-handedness effect frequency range to adapt to the demand of different practical application.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the effective dielectric constant change schematic diagram of the embodiment of the present invention 1.In fig. 2, abscissa is frequency/GHz, and ordinate is the value of effective dielectric constant; Solid-line curve is the real part of effective dielectric constant, and imaginary curve is the imaginary part of effective dielectric constant.
Fig. 3 is the equivalent permeability change schematic diagram of the embodiment of the present invention 1.In figure 3, abscissa is frequency/GHz, and ordinate is the value of equivalent permeability; Solid-line curve is the real part of equivalent permeability, and imaginary curve is the imaginary part of equivalent permeability.
Fig. 4 is the equivalent refractive index change schematic diagram of the embodiment of the present invention 1.In the diagram, abscissa is frequency/GHz, and ordinate is the value of equivalent refractive index; Solid-line curve is the real part of equivalent refractive index, and imaginary curve is the imaginary part of equivalent refractive index.
Fig. 5 is the structural representation of the embodiment of the present invention 2.
Fig. 6 is the equivalent refractive index change schematic diagram of example example 2 of the present invention.In figure 6, abscissa is frequency/GHz, and ordinate is the value of equivalent refractive index; Solid-line curve is the real part of equivalent refractive index, and imaginary curve is the imaginary part of equivalent refractive index.
Fig. 7 is the structural representation of the embodiment of the present invention 3.
Fig. 8 is the equivalent refractive index change schematic diagram of the embodiment of the present invention 3.In fig. 8, abscissa is frequency/GHz, and ordinate is the value of equivalent refractive index; Solid-line curve is the real part of equivalent refractive index, and imaginary curve is the imaginary part of equivalent refractive index.
Fig. 9 is the structural representation of the embodiment of the present invention 4.
Figure 10 is the equivalent refractive index change schematic diagram of the embodiment of the present invention 4.In Fig. 10, abscissa is frequency/GHz, and ordinate is the value of equivalent refractive index; Solid-line curve is the real part of equivalent refractive index, and imaginary curve is the imaginary part of equivalent refractive index.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described.
Embodiment 1
See Fig. 1 ~ 4, the present embodiment is provided with microwave dielectric material substrate 1 and metal-layer structure, and metal-layer structure is coated in microwave-medium substrate side;
Metal-layer structure comprises 4 identical jatharapanvartanasana helical structures and 1 decussate texture, to be carried on 1 decussate texture with quadruple rotational-symmetric form by 4 identical jatharapanvartanasana helical structures and to be formed, described jatharapanvartanasana helical structure comprises 4 straight line segmentation metal tapes, each bar straight line segmentation metal tape by counterclockwise contacting, and vertically connects between adjacent straight line segment formula metal tape.
The dielectric constant of microwave dielectric material substrate is 4.4, and shape is square, length of side L=20mm, thickness h=0.32mm.Described 4 strip metal strip lengths are followed successively by b1=6.4mm, b2=6.0mm, b3=5.0mm, b4=4.5mm, width w all=0.60mm.The long limit L=20mm of described cross metal tape, minor face a=10mm, width w all=0.60mm.Cover copper technology and be coated in medium substrate one side, covering copper thickness is 0.025mm.This cellular construction near 1.9GHz near frequency and 2.8GHz frequency place can realize good equivalent negative dielectric constant properties; Create small equivalent negative magnetic permeability at 1.9GHz place, near 2.8GHz, create wider equivalent negative magnetic permeability frequency band.Comprehensive two electromagnetic parameters, composition graphs 4, its equivalent refractive index can be obtained and there is very narrow negative index bandwidth at 1.9GHz frequency place, in 2.8 ~ 3.4GHz frequency range, achieve the negative index characteristic of broad frequency band, two concrete negative index frequency bands are: 1.814 ~ 1.934GHz and 2.820 ~ 3.409GHz.
Embodiment 2
See Fig. 5 and 6, similar to Example 1, difference is, described jatharapanvartanasana helical structure by 7 straight line segmentation metal tapes by counterclockwise series winding, and adjacent between vertically connect.The 3 strip metal strip lengths increased are respectively c1=3.5mm, c2=1.5mm, c3=3.2mm, width w1 all=0.25mm.This resonance control structure adds series inductance and shunt capacitance on the basis of former cellular construction, by the formula of resonance frequency
known, resonance frequency will reduce.
As shown in Figure 6, two negative index frequency bands of this embodiment are respectively: 1.688 ~ 1.799GHz and 2.556 ~ 3.114GHz, and compare former cellular construction, left-handedness effect frequency has been moved to the left 6.9% ~ 9.3%.
Embodiment 3
See Fig. 7 and 8, similar to Example 1, difference is, is disconnected by that straightway metal band of afterbody and not being connected, as resonance control structure.Its length d1=3.5mm, width w2=0.60mm, the gap g=0.25mm disconnected, this metal band of vertical range d2=3.3mm. of this metal band horizontal symmetry-line and initial point and former cellular construction end indirect coupling, produce new current loop, thus affect previous CURRENT DISTRIBUTION, cause the change of electromagnetic resonance.Two negative index frequency bands of this embodiment are respectively: 1.813 ~ 1.935GHz and 2.830 ~ 3.471GHz.Near 1.9GHz, frequency place left-handedness effect bandwidth is substantially constant, near 2.4GHz, frequency place left-handedness effect bandwidth is increased to 641MHz by original 589MHz, bandwidth enlargement 52MHz, reach about 8.8% relatively widen rate.
Embodiment 4
See Fig. 9 and 10, similar to Example 1, difference is, the resonance control structure in the present embodiment is a conductor disk, and the vertical range of its center of circle and Two coordinate axle is respectively e1=3.1 ~ 3.5mm, e2=2.4 ~ 2.8mm.Conductor disk can change the left hand characteristic of former cellular construction left-handed materials equally.Two negative index frequency bands of this embodiment are respectively: 1.773 ~ 1.892GHz and 2.719 ~ 3.310GHz.Frequency and the bandwidth of two left-handedness effect frequency ranges of former cellular construction left-handed materials change all to some extent.
Claims (8)
1. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure, it is characterized in that, be provided with microwave dielectric material substrate and metal-layer structure, metal-layer structure is coated in microwave-medium substrate side;
Metal-layer structure comprises 4 identical jatharapanvartanasana helical structures and 1 decussate texture, to be carried on 1 decussate texture with quadruple rotational-symmetric form by 4 identical jatharapanvartanasana helical structures and to be formed, described jatharapanvartanasana helical structure comprises at least 3 straight line segmentation metal tapes, each bar straight line segmentation metal tape is by counterclockwise contacting, and vertically connect between adjacent straight line segment formula metal tape, wherein the longest straight line segmentation metal tape is connected with one end of decussate texture is vertical.
2. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, the dielectric constant of described microwave dielectric material substrate is 2.2 ~ 8.0.
3. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, the shape of described microwave dielectric material substrate is square, length of side L=12 ~ 20mm, thickness h=0.18 ~ 0.32mm.
4. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, described jatharapanvartanasana helical structure is contacted by counter clockwise direction by 4 straight line segmentation metal tapes, and vertically connects between adjacent straight line segment formula metal tape; The length of 4 strip metal bands can be b1=5.0 ~ 6.4mm successively, b2=4.8 ~ 6.0mm, b3=4.8 ~ 6.0mm, b4=3.5 ~ 4.5mm, width w=0.55 ~ 0.65mm; The size of described cross metal tape can be: long limit L=12 ~ 20mm, minor face a=9.0 ~ 15mm, width w=0.55 ~ 0.65mm.
5. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, described jatharapanvartanasana helical structure is contacted by counter clockwise direction by 7 straight line segmentation metal tapes, and vertically connects between adjacent straight line segment formula metal tape.
6. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, described jatharapanvartanasana helical structure is arranged by counter clockwise direction by 5 straight line segmentation metal tapes, vertically connect between front 4 straight line segmentation metal tapes are adjacent, 1 straight line segmentation metal tape of afterbody is vertical with adjacent straight line segment formula metal tape leaves spacing.
7. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, described jatharapanvartanasana helical structure is made up of 3 straight line segmentation metal tapes and 1 metal disk, each straight line segmentation metal tape by counterclockwise contacting, and vertically connects between adjacent straight line segment formula metal tape; Metal disk is connected with the straight line segmentation metal tape inner surface being in afterbody.
8. be with the jatharapanvartanasana left-handed materials cellular construction of multi-resonant control structure as claimed in claim 1, it is characterized in that, described metal level is layers of copper, and copper layer thickness is 0.015 ~ 0.025mm.
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Cited By (4)
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| CN107359421A (en) * | 2017-07-13 | 2017-11-17 | 厦门大学 | LHM based on goat's horn shape basic cell structure |
| CN111600130A (en) * | 2020-05-27 | 2020-08-28 | 西安朗普达通信科技有限公司 | Decoupling chip |
| CN111682649A (en) * | 2020-06-22 | 2020-09-18 | 电子科技大学 | Electromagnetic energy collector based on super surface |
| CN112768906A (en) * | 2020-12-24 | 2021-05-07 | 厦门大学 | S-shaped rotating unit structure planar reflection array antenna with left-hand regulation structure |
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Application publication date: 20151202 |