CN109786974B - Broadband negative-permeability metamaterial plate for wireless power transmission and working method thereof - Google Patents
Broadband negative-permeability metamaterial plate for wireless power transmission and working method thereof Download PDFInfo
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- CN109786974B CN109786974B CN201910207133.9A CN201910207133A CN109786974B CN 109786974 B CN109786974 B CN 109786974B CN 201910207133 A CN201910207133 A CN 201910207133A CN 109786974 B CN109786974 B CN 109786974B
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Abstract
The invention relates to a broadband negative permeability metamaterial plate for wireless power transmission, which comprises a dielectric substrate, wherein a resonance coil A and a resonance coil B are respectively arranged on two sides of the dielectric substrate, and the number of spiral turns of the resonance coil A is different from that of the resonance coil B; the invention also relates to a working method of the broadband negative permeability metamaterial plate for wireless power transmission. The invention has simple structure, simple operation and wider bandwidth and working frequency band.
Description
Technical Field
The invention relates to a broadband negative magnetic permeability metamaterial plate for wireless power transmission and a working method thereof.
Background
The electromagnetic metamaterial belongs to an artificial material, and is a special material which does not exist in the natural world and has a composite structure. The material has special properties in the field of electromagnetism because the permeability and the dielectric constant of the material can realize negative values under certain conditions, and the material is also called as a left-handed material or a metamaterial.
In recent years, with the rise of magnetic coupling resonant wireless power transmission technology, how to improve the efficiency of wireless power transmission becomes an important problem that must be solved at present. The coupling degree of the resonance coil of the wireless energy transmission system is the key point for improving the transmission efficiency, the coupling degree and the distance have close relation, and the magnetic field generated by the coil is exponentially attenuated along with the increase of the distance, so that the wireless power transmission cannot be widely applied to the industry. In order to solve the problem, the negative magnetic permeability metamaterial can be well applied, has a magnetic field focusing effect, and can greatly improve the transmission distance and efficiency in the wireless power transmission process when being placed in a wireless power transmission system.
The traditional metamaterial with negative magnetic permeability has many problems, the effective part of the negative magnetic permeability of the traditional metamaterial which works at the frequency of 13.56MHz is only about 1M to 2M, the effective bandwidth is too narrow, if the working frequency of a system fluctuates due to external factors, the transmission efficiency of the system is rapidly reduced and cannot meet the requirement, and the application of the metamaterial in a wireless electric energy transmission system is greatly limited due to the narrow working frequency band of the material and high requirements on design precision and processing precision.
Disclosure of Invention
In view of this, the invention aims to provide a broadband negative-permeability metamaterial plate for wireless power transmission and a working method thereof, which are simple in structure, simple and convenient to operate, and have wider bandwidth and working frequency band.
The technical scheme of the invention is as follows: the broadband negative-permeability metamaterial plate for wireless power transmission comprises a dielectric substrate, wherein a resonant coil A and a resonant coil B are arranged on two sides of the dielectric substrate respectively, and the number of spiral turns of the resonant coil A is different from that of the resonant coil B.
Further, when the resonance coil a and the resonance coil B are translated to the same plane in a direction perpendicular to the dielectric substrate, the winding lines of the resonance coil a and the resonance coil B are not overlapped, and the resonance coil B is located inside the innermost ring of the resonance coil a.
Furthermore, the number of turns of the resonance coil A is 12-25.
Furthermore, the number of turns of the resonance coil B is 6-16.
Furthermore, the difference of the number of turns of the resonance coil A and the number of turns of the resonance coil B is 7-11 turns.
Furthermore, the thickness of the metal wires of the resonance coil A and the resonance coil B is 0.01-0.05 mm, the width is 0.5-2 mm, and the distance between the metal wires is 1-2 mm.
Furthermore, the dielectric substrate is an epoxy resin substrate, and the thickness of the dielectric substrate is 0.8 mm-3 mm.
The invention provides another technical scheme that the working method of the broadband negative magnetic permeability metamaterial plate for wireless power transmission comprises the following steps: when the broadband negative permeability metamaterial plate array structure works, a plurality of broadband negative permeability metamaterial plates are arranged in an array mode, when electromagnetic waves are incident on the broadband negative permeability metamaterial plate array structure, the inductance and the parasitic capacitance on each broadband negative permeability metamaterial plate can resonate, so that the reflection and the transmission of the electromagnetic waves are changed, from the whole period array, the whole permeability of the broadband negative permeability metamaterial plate array structure can generate a negative permeability part behind a resonance point, an electromagnetic wave gathering effect is generated, and the working frequency band of the metamaterial can be changed by changing the number of turns, the width and the thickness of a coil.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention has wider working frequency range and can be suitable for complex working environment;
(2) the invention has small volume, thin thickness and convenient processing;
(3) the loss generated by the invention is low;
(4) experiments show that the working frequency range of the metamaterial can be changed by the parameters of the variable coil and the substrate, so that the working frequency range can be controlled by parameter selection, and the metamaterial can be suitable for various wireless power transmission devices;
(5) the invention can be processed by adopting a PCB hard brush technology, is beneficial to the rapid production of the metamaterial, and has simple process and low cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a rear view of an embodiment of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 1 according to an embodiment of the present invention;
FIG. 4 is a front view of an array of broadband negative permeability metamaterial plates in accordance with an embodiment of the present invention;
FIG. 5 is a rear view of an array of broadband negative permeability metamaterial plates in accordance with an embodiment of the present invention;
FIG. 6 is a real part curve of the magnetic permeability of the broadband negative magnetic permeability metamaterial array at a resonance point;
FIG. 7 is a graph of the imaginary part of the magnetic permeability of the broadband negative magnetic permeability metamaterial array at the resonance point;
in the figure: 10-resonant coil a; 20-resonant coil B; 30-dielectric substrate.
Detailed Description
As shown in fig. 1 to 7, a broadband negative permeability metamaterial plate for wireless power transmission includes a dielectric substrate 30, a resonant coil a10 and a resonant coil B20 are respectively disposed on two sides of the dielectric substrate 30, and the number of turns of the resonant coil a10 is different from that of the resonant coil B20. The resonance coil a10 and the resonance coil B20 may have a square spiral structure or a circular spiral structure. When the electromagnetic wave resonant structure works, the electromagnetic wave resonates at the critical point of the resonant coil A10, the magnetic permeability of the electromagnetic wave rises from a negative value to a positive value, and the electromagnetic wave resonates again when passing through the resonant coil B20, so that the effective working bandwidth of the frequency band with the magnetic permeability of a negative value is prolonged. Due to the special structure, the range of the working bandwidth can be adjusted by changing the number of turns, the width and the thickness of the coil, and the device has good adaptability. The invention is beneficial to the self inductance and parasitic capacitance of the coil to finish the resonance process, thus having the advantages of low cost and convenient processing, and having simple structure, thin thickness and low requirement on design precision, thereby having great prospect in industrial application.
In this embodiment, when the resonance coil a10 and the resonance coil B20 are translated to the same plane in the direction perpendicular to the dielectric substrate 30, the winding patterns of the resonance coil a10 and the resonance coil B20 do not overlap, and the resonance coil B is located inside the innermost turn of the resonance coil a.
In this embodiment, the number of turns of the resonance coil a10 is 12 to 25.
In the embodiment, the number of turns of the resonance coil B20 is 6-16.
In the embodiment, the difference between the number of turns of the resonance coil A10 and the number of turns of the resonance coil B20 is 7-11 turns.
In this embodiment, the thickness of the metal wire of the resonance coil a10 and the resonance coil B20 is 0.01mm to 0.05mm, the width is 0.5mm to 2mm, and the distance between the metal wires is 1mm to 2 mm.
In this embodiment, the dielectric substrate 30 is an epoxy resin substrate, and the thickness of the dielectric substrate 30 is 0.8mm to 3 mm.
A working method of a broadband negative permeability metamaterial plate for wireless power transmission comprises the following steps: when the broadband negative permeability metamaterial plate array structure works, a plurality of broadband negative permeability metamaterial plates are arranged in an array mode, when electromagnetic waves are incident on the broadband negative permeability metamaterial plate array structure, the inductance and the parasitic capacitance on each broadband negative permeability metamaterial plate can resonate, so that the reflection and the transmission of the electromagnetic waves are changed, from the whole period array, the whole permeability of the broadband negative permeability metamaterial plate array structure can generate a negative permeability part behind a resonance point, an electromagnetic wave gathering effect is generated, and the working frequency band of the metamaterial can be changed by changing the number of turns, the width and the thickness of a coil.
Fig. 6 is a curve of the real part of the magnetic permeability of the broadband negative magnetic permeability metamaterial array at the resonance point, and it can be seen that the metamaterial plate of the invention resonates near 11M, and then the magnetic permeability presents a negative value, the conventional metamaterial will maintain the magnetic permeability of 1M-2M and then increase to positive, but the magnetic permeability of the invention does not increase to positive until 19M after decreasing to the negative value, the effective working bandwidth is about 8M, and both 11M-19M are negative values. Compared with the traditional metamaterial, the effective bandwidth of the metamaterial is improved by about 400%.
Fig. 7 is a graph of the imaginary part of the permeability of the broadband negative permeability metamaterial array at the resonance point, and it can be seen that the imaginary part of the permeability is reduced to be close to 0 soon after the resonance point, that is, in the following frequency band, the loss is reduced to be close to 0, which is negligible. The structure of the negative magnetic conductivity broadband metamaterial has the advantage of extremely low loss in practical application.
The above-mentioned operation flow and software and hardware configuration are only used as the preferred embodiment of the present invention, and not to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or directly or indirectly applied to the related art, are included in the scope of the present invention.
Claims (7)
1. The utility model provides a broadband negative permeability metamaterial board of wireless power transmission which characterized in that: including the medium base plate, be provided with resonance coil A and resonance coil B respectively in medium base plate both sides, resonance coil A and resonance coil B's spiral number of turns is different, and when translating resonance coil A and resonance coil B to the coplanar in the direction of perpendicular to medium base plate, resonance coil A and resonance coil B's wire winding line can not overlap, and resonance coil B is located the inside of resonance coil A's innermost circle.
2. The broadband negative permeability metamaterial plate for wireless power transmission according to claim 1, wherein: the number of turns of the resonance coil A is 12-25.
3. The broadband negative permeability metamaterial plate for wireless power transmission according to claim 1, wherein: the number of turns of the resonance coil B is 6-16.
4. The broadband negative permeability metamaterial plate for wireless power transmission according to claim 1, wherein: the difference between the number of turns of the resonance coil A and the number of turns of the resonance coil B is 7-11 turns.
5. The broadband negative permeability metamaterial plate for wireless power transmission according to claim 1, wherein: the thickness of the metal wires of the resonance coil A and the resonance coil B is 0.01 mm-0.05 mm, the width is 0.5 mm-2 mm, and the distance between the metal wires is 1 mm-2 mm.
6. The broadband negative permeability metamaterial plate for wireless power transmission according to claim 1, wherein: the dielectric substrate is an epoxy resin substrate, and the thickness of the dielectric substrate is 0.8-3 mm.
7. A working method of a broadband negative permeability metamaterial plate for wireless power transmission, comprising the broadband negative permeability metamaterial plate for wireless power transmission according to claim 1, wherein the working method comprises the following steps: when the broadband negative permeability metamaterial plate array structure works, a plurality of broadband negative permeability metamaterial plates are arranged in an array mode, when electromagnetic waves are incident on the broadband negative permeability metamaterial plate array structure, the inductance and the parasitic capacitance on each broadband negative permeability metamaterial plate can resonate, so that the reflection and the transmission of the electromagnetic waves are changed, from the whole period array, the whole permeability of the broadband negative permeability metamaterial plate array structure can generate a negative permeability part behind a resonance point, an electromagnetic wave gathering effect is generated, and the working frequency band of the metamaterial can be changed by changing the number of turns, the width and the thickness of a coil.
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| CN110635578A (en) * | 2019-09-25 | 2019-12-31 | 福州大学 | Double-frequency negative permeability metamaterial plate applied to wireless power transmission |
| CN113517567B (en) * | 2021-05-21 | 2022-08-16 | 福州大学 | Frequency-adjustable negative permeability metamaterial plate applied to wireless power transmission |
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| CN102484497A (en) * | 2010-08-11 | 2012-05-30 | 株式会社村田制作所 | Frequency-stabilizing circuit, antenna apparatus and communication terminal device |
| KR20130040041A (en) * | 2011-10-13 | 2013-04-23 | 한양대학교 산학협력단 | Meta-atoms having negative permeability and metamaterials including the meta-atoms |
| CN103296769A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Wireless energy transmission system |
| JP2016195394A (en) * | 2015-03-31 | 2016-11-17 | 独立行政法人国立高等専門学校機構 | Transmission line, wiring board, and high frequency device using them, and design method of transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106532976A (en) * | 2016-11-16 | 2017-03-22 | 华中科技大学 | Wireless electric energy transmission device based on 13.56MHz metamaterial |
| CN106450784A (en) * | 2016-11-16 | 2017-02-22 | 华中科技大学 | Metamaterial with low-frequency negative magnetic permeability |
| CN107919531A (en) * | 2017-10-27 | 2018-04-17 | 天津理工大学 | A kind of tunable metamaterial antenna for wireless power transmission system |
| CN108493618A (en) * | 2018-02-07 | 2018-09-04 | 上海交通大学 | Square helical structure negative-magnetic-permeability meta-material |
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| CN102484497A (en) * | 2010-08-11 | 2012-05-30 | 株式会社村田制作所 | Frequency-stabilizing circuit, antenna apparatus and communication terminal device |
| KR20130040041A (en) * | 2011-10-13 | 2013-04-23 | 한양대학교 산학협력단 | Meta-atoms having negative permeability and metamaterials including the meta-atoms |
| CN103296769A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Wireless energy transmission system |
| JP2016195394A (en) * | 2015-03-31 | 2016-11-17 | 独立行政法人国立高等専門学校機構 | Transmission line, wiring board, and high frequency device using them, and design method of transmission line |
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