CN106410420A - Novel metamaterial with negative equivalent permittivity and equivalent magnetic permeability - Google Patents
Novel metamaterial with negative equivalent permittivity and equivalent magnetic permeability Download PDFInfo
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- CN106410420A CN106410420A CN201610938089.5A CN201610938089A CN106410420A CN 106410420 A CN106410420 A CN 106410420A CN 201610938089 A CN201610938089 A CN 201610938089A CN 106410420 A CN106410420 A CN 106410420A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention discloses a novel metamaterial with negative equivalent permittivity and equivalent magnetic permeability. The novel metamaterial comprises a dielectric substrate; and two sides of the dielectric substrate are symmetrically printed with x*y periodically-arranged metal units, wherein the metal unit is of a four-arm helical structure. According to the novel metamaterial of the invention, a four-arm helical terminal connected structure is adopted to replace a traditional open loop and metal stub-combined structure, and therefore, the equivalent permittivity and equivalent magnetic permeability of the novel metamaterial can be negative.
Description
Technical field
The present invention relates to wireless energy transfer field and in particular to a kind of effective dielectric constant and equivalent permeability be negative
The Novel meta-material of number.
Background technology
Transmit the difference of realization mechanism and mode according to energy, wireless energy transmission technology generally can be divided into based on electromagnetism
The wireless energy transmission technology of principle of induction, the electromagnetic wave energy transmission technology being sent and received by antenna（RF radio wave
Technology）, laser technology, microwave technology and the capacitive wireless power transmission technology based on principle of electric field.These energy transmission means
In, laser mode can only point-to-point transmission, and easily affected by environmental factorss；Microwave and RF radio wave mode are in high-power energy
All there is radiation too strong, the drawbacks of harmful in amount transmitting procedure；The technology of field coupling wireless power transmission is at present still
It is in the starting stage.
So-called near field, refers to the efficient energy transmission region between induction zone and far field free space.2007
Year, masschusetts, U.S.A Polytechnics work out based in coupled mode theory magnetic coupling harmonic technology apart from the two of wireless energy transfer
Big scientific achievement：1）In the case of two coil resonance frequency identicals (ω 1=ω 2), the magnetic field of two coils is in close coupling
Resonant condition, now, resonance primary coil constantly extracting energy from driving source, resonance is passed to by close coupling resonance manner
Secondary coil；2）The quality factor of two coils is bigger, that is, the reactance energy/radiation storing and ohmic loss ratio are bigger, coil
Surrounding space storage magnetic field energy is higher, and radiation, ohmic loss are less, and two coil wireless energy transmission efficiencies are higher.Since then with
Come, the research with regard near field wireless energy transfer is more and more hotter both at home and abroad.
The electromagnetism constitutive parameter (i.e. DIELECTRIC CONSTANT ε, magnetic permeability μ) of medium determines the spy of the electromagnetic field being contained therein
Property.Change the electromagnetism constitutive parameter of certain media in wireless energy transfer system coupled field, changed by the characteristic of medium whole
Electricity in individual region, magnetic energy distribution, thus strengthening the degree of coupling between wireless energy transfer system transmitting terminal and receiving terminal,
Improve function and the efficiency of wireless energy transfer.This method is simultaneously suitable for magnetic coupling or the wireless energy of field coupling passes
Defeated system.It is true that for mechanical wave field, also favorably using the medium of manual construction to change the report of mechanical wave propagation characteristic.This
Class passes through the non-natural medium of manual construction, may be collectively referred to as Meta Materials (Metamaterials, MTM) that is to say, that utilizing
The technology that MTM improves wireless energy transfer system transmission characteristic goes for through magnetic field, electric field or mechanical wave field coupling
All kinds of wireless energy transfer systems.
Content of the invention
In order to overcome shortcoming and the deficiency of prior art presence, the present invention provides one kind to be used for improving wireless energy transfer effect
The effective dielectric constant of rate and equivalent permeability are the Novel meta-material of negative.
The present invention adopts the following technical scheme that：
A kind of effective dielectric constant and equivalent permeability are the Novel meta-material of negative, including medium substrate, are given an account of
The double-sided symmetrical of matter substrate prints the metal unit of x*y periodic arrangement, and described metal unit adopts four arm helical structures.
Described four arm helical structures are specially：Four initial arms centered on same starting point divide according to same direction
Xuan Zhuan not enclose n, four arm terminals adopt stub to connect, and play, in junction, the metal list that metallic vias connect medium substrate two sides
Unit.
Described four initial arms centered on same starting point are equivalently-sized, and adjacent angle is 90 degree, described same
Direction is specially counter clockwise direction or clockwise direction.
Described four arm helical structures are rectangular coil structure or annular helical structure.
Four arm helical structures are rectangular coil structure, and four initial arms are defined according to counterclockwise rotates 10 by starting point
Circle.
Between the metal unit of arranged adjacent, spacing is 3mm.
Beneficial effects of the present invention：
（1）Using four arm spiral terminal connected structures, replace traditional split ring to add metal short-term structure, realize equivalent magnetic
Conductance and effective dielectric constant are negative simultaneously；
（2）Using two-sided layout, it is connected by metallic vias, realizes miniaturization；
（3）The electromagnetism constitutive parameter (i.e. DIELECTRIC CONSTANT ε, magnetic permeability μ) of medium determines the electromagnetic field being contained therein
Characteristic, is changed the electromagnetism constitutive parameter of certain media in wireless energy transfer system coupled field, is changed by the characteristic of medium
Electricity in whole region, magnetic energy distribution, thus strengthen the coupling journey between wireless energy transfer system transmitting terminal and receiving terminal
Degree, improves function and the efficiency of wireless energy transfer.
（4）With（1）（2）Method formed Novel meta-material unit in order to be applied to electric small spiral antenna, using the 5*5 cycle
Property arrangement, after tested, 80cm at, efficiency of transmission than former wireless energy transfer system increase by 10%.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the curve chart of the effective dielectric constant of the present invention；
Fig. 3 is the curve chart of the equivalent permeability of the present invention；
Fig. 4 is the metamaterial structure schematic diagram of the metal unit of 5*5 periodic arrangement；
Fig. 5 is the structural representation that the present invention applies in wireless energy transfer system；
When Fig. 6 is that in prior art, wireless energy transfer system and system shown in Figure 5 are operated in 60cm, 70cm and 80cm
Energy transmission efficiency contrast curve chart.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in figure 1, a kind of effective dielectric constant and the Novel meta-material of all non-negative of equivalent permeability, it is applied to wireless
Energy transmission system, to improve the energy transmission efficiency of system.
New material includes medium substrate 1, and the tow sides of described medium substrate symmetrically print x*y periodic arrangement
Metal unit, X and Y is natural number, and described metal unit adopts four arm helical structures 2, and described four arm helical structures are rectangle
Helical structure or annular helical structure.Four initial arms centered on same starting point are simultaneously according to clockwise or counterclockwise
Direction rotates n circle, and in four initial arms, the angle of adjacent initial arm is 90 degree, and the starting point of four arms is identical, and its terminal adopts short
Transversal links together, and makes a call to a metallization via 3 in destination county and be used for connecting double-edged metal unit.
In the present embodiment, four arm helical structures adopt rectangular coil structure, four initial arms with the center of circle as starting point, according to
Semiaxis about X-axis, the upper and lower semiaxis of Y-axis arranges, adjacent initial arm angle is 90 degree, and four initial arms are respectively according to counterclockwise
Rotation 10 circle, equivalently-sized a length of 7mm of four initial arms, a width of 0.2mm of arm, between two-arm, spacing is 0.2mm.Using cutting back
Line connects the terminal of four arms, and cutting back line width is 0.4mm, opens via at stub end, and crossing pore radius is 0.2mm.
In the present embodiment, initial brachium li is 7mm, and arm width w is 0.2mm, and between two-arm, distance s are 0.2mm.Metal unit
Length lo of outmost turns is 35mm, and l is full-size 38mm of described metamaterial unit, between metal unit be have certain between
Away from the present embodiment, the spacing between adjacent metal unit is 3mm.
Fig. 2 and Fig. 3 is the test chart of the present embodiment, from figure 2 it can be seen that the effective dielectric constant of test exists
13.56MHz it is negative for locating.From figure 3, it can be seen that the equivalent permeability of test is negative at 13.56MHz.
As shown in figure 5, the wireless energy transfer system that a kind of employing present invention realizes, Meta Materials such as Fig. 4 institute that Fig. 5 adopts
Show, the tow sides of medium substrate print 5*5 metal unit, the present invention are respectively placed in the transmitting of wireless energy transfer system
60cm, 70cm, 80cm is chosen respectively during the distance test at antenna end and reception antenna end, transmitting antenna end and reception antenna end.
These three apart under have Meta Materials and no Meta Materials system transfers efficiency as shown in Figure 6.At 60cm, there are Meta Materials and no surpass
The system transfers efficiency of material is respectively 98% and 92.4%；At 70cm, Meta Materials and the system transfers efficiency of no Meta Materials is had to divide
Wei 88.6% and 77.4%；At 80cm, Meta Materials and the system transfers efficiency of no Meta Materials is had to be respectively 61% and 72%.From Fig. 6
As can be seen that Meta Materials are improved to the efficiency of transmission of wireless energy transfer system.
Described Novel meta-material unit is constant, and number of the arrangement can change according to the size of wireless energy transfer antenna, its
The number of turns of rotation is relevant with resonant frequency point, and resonant frequency point realized by 10 circles of the present invention is 13.56MHz.
Described dielectric board material adopts FR4, and dielectric constant is 4.4, and loss angle tangent is 0.0002, and thickness is 1.6mm.
Described four arm helical structures, according to other structures, will affect topology layout, and then affect overall performance.
The present invention equivalent permeability and effective dielectric constant in 13.5MHz-14MHz frequency band are negative, are applied to work
Make the wireless energy transfer system in 13.56MHz for the frequency.
The present invention adopts four arm spiral terminal connected structures, replaces tradition complexity, the split ring of redundancy to add metal wire, uses one
It is negative for planting structure and realizing equivalent permeability with effective dielectric constant simultaneously.
The present invention adopts double-sided symmetrical layout, is connected by metallic vias, realizes miniaturization.
Low frequency of the present invention, double negative, miniaturization is realized simultaneously, to change certain media in wireless energy transfer system coupled field
Electromagnetism constitutive parameter, change whole region in electricity, magnetic energy distribution, thus strengthen wireless energy transfer system transmitting terminal and
Degree of coupling between receiving terminal, improves function and the efficiency of wireless energy transfer.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to described embodiment
Limit, other any spirit without departing from the present invention and the change made under principle, modification, replacement, combine, simplify,
All should be equivalent substitute mode, be included within protection scope of the present invention.
Claims (6)
1. a kind of effective dielectric constant and equivalent permeability are the Novel meta-material of negative it is characterised in that including medium base
Plate, the double-sided symmetrical of described medium substrate prints the metal unit of x*y periodic arrangement, and described metal unit adopts four arm spiral shells
Rotation structure.
2. Novel meta-material according to claim 1 is it is characterised in that described four arm helical structures are specially：With same
Four initial arms centered on individual starting point rotate n circle respectively according to same direction, and four arm terminals adopt stub to connect, and
The metal unit that metallic vias connect medium substrate two sides is beaten in junction.
3. Novel meta-material according to claim 2 is it is characterised in that described centered on same starting point four
Initial arm is equivalently-sized, and adjacent angle is 90 degree, and described same direction is specially counter clockwise direction or clockwise direction.
4. Novel meta-material according to claim 1 is it is characterised in that described four arm helical structures are rectangular coil structure
Or annular helical structure.
5. Novel meta-material according to claim 2 it is characterised in that four arm helical structures be rectangular coil structure, four
Individual initial arm is defined by starting point and encloses according to counterclockwise rotates 10.
6. Novel meta-material according to claim 1 it is characterised in that between the metal unit of arranged adjacent spacing be
3mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711618A (en) * | 2017-02-24 | 2017-05-24 | 华南理工大学 | Miniaturized low-frequency magnetic annular moment near magnetic field focusing magnifying lens |
| CN108493618A (en) * | 2018-02-07 | 2018-09-04 | 上海交通大学 | Square helical structure negative-magnetic-permeability meta-material |
| CN110635578A (en) * | 2019-09-25 | 2019-12-31 | 福州大学 | Double-frequency negative permeability metamaterial plate applied to wireless power transmission |
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| CN108493618A (en) * | 2018-02-07 | 2018-09-04 | 上海交通大学 | Square helical structure negative-magnetic-permeability meta-material |
| CN110635578A (en) * | 2019-09-25 | 2019-12-31 | 福州大学 | Double-frequency negative permeability metamaterial plate applied to wireless power transmission |
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| CN106410420B (en) | 2022-08-12 |
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