CN106711617B - Plane lens for focusing and amplifying near magnetic field by utilizing magnetic ring dipole - Google Patents
Plane lens for focusing and amplifying near magnetic field by utilizing magnetic ring dipole Download PDFInfo
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- CN106711617B CN106711617B CN201710102836.6A CN201710102836A CN106711617B CN 106711617 B CN106711617 B CN 106711617B CN 201710102836 A CN201710102836 A CN 201710102836A CN 106711617 B CN106711617 B CN 106711617B
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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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- 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
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a plane lens for focusing and amplifying a near magnetic field by utilizing a magnetic ring dipole, which consists of a magnetic ring dipole unit array or a single magnetic ring dipole unit, wherein the magnetic ring dipole unit comprises a dielectric substrate and two resonators with the same structure, the resonators are symmetrically arranged on the front side and the back side of the dielectric substrate, the two resonators are centrally symmetrical relative to the dielectric substrate, and the resonators consist of two spiral coils. The invention can remarkably improve the efficiency of wireless energy transmission between two antennas.
Description
Technical Field
The invention relates to the field of wireless energy transmission, in particular to a plane lens for focusing and amplifying a near magnetic field by utilizing a magnetic ring dipole.
Background
Near field focusing has been a research hotspot in many fields, applying to: (1) Near field magnetic energy wireless transmission, (2) medical treatment, medical imaging. The pulsed magnetic field becomes a hot spot in the medical research and clinical treatment fields due to the non-thermal effect, strong transmission force and no pain. (3) high resolution imaging.
The medical magnetic hardware system is still in the physical experiment stage, and the key problems are as follows: the near magnetic field diverges, the field strength is insufficient, and the near magnetic field decays sharply along with the distance, such as medical imaging treatment, and the targeted tissue has insufficient strength and depth and normal tissue is damaged. The wireless energy transmission efficiency decreases dramatically with increasing distance. The same problem exists in other fields. The problem is that the near field of the excitation antenna is evanescent wave, the evanescent wave decays sharply along with the increase of the distance, and the near field diverges unfocused. The radiation energy from hundreds of MHz to GHz frequency band is easy to be absorbed by water composing the vast majority of body, so the radiation mode is avoided to use so far, the frequency band used for magnetic near field focusing is generally from hundreds of kHz to tens of MHz frequency band, however, the low frequency near field focusing has huge commercial interests in many fields, and few reports on such magnetic field design and calculation are made at home and abroad. The antenna array and the near field plate focusing technology have joule and radiation loss, so that the short distance of the evanescent wave decays exponentially, and the efficiency is deteriorated. Evanescent waves are generally focused and amplified based on an antenna array and a metamaterial lens with negative magnetic permeability, however, joule and radiation losses deteriorate efficiency. The patent is a novel negative magnetic permeability lens based on magnetic ring dipoles.
The first time a ring resonance was proposed in atomic physics by Zel' dovich 1957 and is widely present in nature as small as nuclei, atoms, molecules and other fundamental particles as the astronomy collar. The ring resonance is generated by a ring dipole. The ring dipoles are composed of end-to-end electric or magnetic dipoles. Unlike electric and magnetic dipoles, ring dipoles are also a fundamental electromagnetic response, but are far more complex to construct than electric and magnetic dipoles. However, the electromagnetic response of ring dipoles is relatively weak, and is usually masked by electric or magnetic dipoles, and is therefore ignored for a long time. In 2010, kaelber et al experimentally achieved ring resonance in the microwave range by arranging four split-resonance rings in a ring-symmetric unit cell, and separated it from other multipoles, with the ring dipole moment dominant over a range of frequencies.
Since then, there has been considerable interest in investigating ring dipole electromagnetic properties and their potential applications. In this process, many excellent structures have been proposed, exhibiting the application value of the annular response in electromagnetic field, and developing rapidly.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a plane lens for focusing and amplifying a near magnetic field by utilizing a magnetic ring dipole.
The invention adopts the following technical scheme:
a plane lens for amplifying a near magnetic field by utilizing magnetic ring dipole focusing is composed of a magnetic ring dipole unit array or a single magnetic ring dipole unit, wherein the magnetic ring dipole unit comprises a dielectric substrate and two resonators with the same structure, the two resonators are symmetrically arranged on the front side and the back side of the dielectric substrate, the two resonators are centrally symmetrical relative to the dielectric substrate, and the resonators are composed of two spiral coils.
The centers of the two spiral coils are in the same horizontal straight line.
The two spiral coils comprise a left spiral coil and a right spiral coil, and are specifically: the wire is wound clockwise from top to bottom around the left spiral coil and the end is wound counterclockwise around the right spiral coil.
The distance between adjacent metal wires in the left side spiral coil and the right side spiral coil is 0.15 cm, and the metal wire width is 0.15 cm.
The spiral coil is specifically a rectangular spiral coil.
The number of turns of the spiral coil on the left side of the resonator arranged on the front side of the medium substrate is the same as the number of turns of the spiral coil on the right side of the resonator arranged on the back side of the medium substrate, the number of turns of the spiral coil on the right side of the resonator is the same as the number of turns of the spiral coil on the left side of the resonator arranged on the back side of the medium substrate, winding directions of the two resonators are the same, negative dielectric constant and magnetic permeability can be achieved by adjusting the number of turns difference |N-M|, N represents the number of turns of the spiral coil on the left side of the resonator arranged on the front side of the medium substrate, and the number of turns of the spiral coil on the right side is M.
The invention has the beneficial effects that:
1. the low-frequency miniaturized planar structure can be integrated, and has low cost and simple manufacture;
2. the metamaterial focusing and amplifying near magnetic field based on magnetic ring dipole negative magnetic conductivity is different from the traditional metamaterial in that the metamaterial overcomes Joule radiation loss and extends the distance of an evanescent field, and has the following mechanism:
(i) The magnetic resonators are mutually resonantly coupled to form an annular magnetic field resonance mode, namely a magnetic ring dipole electromagnetic resonance mode, and the electromagnetic field is limited in the annular space, so that the joule heat loss is small, the radiation is small, and the problems of joule and radiation loss are solved;
(ii) The electromagnetic field is limited in a small area, more energy is accumulated in the near field of the antenna, so that the high Q factor is caused, the magnetic near field of the antenna is attenuated from a higher starting point, the magnetic near field of the system can be extended further, and the problem of rapid attenuation of the evanescent field is solved;
(iii) The dual amplifying focusing function is that the magnetic harmonic oscillator composing the magnetic ring dipole resonates to amplify and focus, and the amplifying focusing function is that inherent to the metamaterial with negative magnetic conductivity. Further enhancing the focusing of the evanescent field.
Drawings
Fig. 1 (a) is a schematic structural view of an array of 4*4 magnetic ring dipole units, and fig. 1 (b) is a perspective view thereof;
FIG. 2 is a top view of a planar lens structure for focusing and amplifying a near magnetic field using a magnetic ring dipole in accordance with the present invention;
FIG. 3 is a perspective view of FIG. 2 of the present invention;
fig. 4 (a), 4 (b) and 4 (c) are magnetic field strength simulation graphs of the present invention, metamaterial-free and conventional negative permeability lenses.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1 (a) and fig. 1 (b), fig. 2 and fig. 3, a planar lens for amplifying a near magnetic field by utilizing magnetic ring dipole focusing is mainly used for medical treatment, medical industry detection and magnetic wireless energy transmission, and is composed of a magnetic ring dipole unit array or a single magnetic ring dipole unit with the same size, wherein the dipole unit comprises a dielectric substrate and two resonators with the same structure symmetrically arranged on the front side and the back side of the dielectric substrate. The two resonators are centrally symmetrical with respect to the dielectric substrate, and the number of turns can be the same or different. Fig. 2 is a schematic diagram of a planar lens structure formed by an array of magnetic ring dipole elements.
The resonator is composed of two spiral coils, namely a left spiral coil and a right spiral coil, and in the embodiment, rectangular spiral coils are adopted. The resonator special winding method positioned on the front surface of the dielectric substrate comprises the following steps: a wire is first wound N turns clockwise to form a left hand coil, and then the end of the wire is wound M turns counter clockwise to form a right hand spiral coil, i.e. the start of the spiral coil of the resonator is in the left hand coil and the end of the spiral coil is in the right hand coil.
The center point of the coil on the left side and the center point of the right side coil are on the same horizontal straight line. The winding direction and the placement position of the resonator on the reverse side of the dielectric substrate are the same as those on the front side when seen from top to bottom, and the specific difference is that the left side is wound clockwise by M turns and then the right side is wound counterclockwise by N turns next to the end of the left side.
The number of turns of the spiral coil on the left side of the resonator arranged on the front side of the medium substrate is the same as the number of turns of the spiral coil on the right side of the resonator arranged on the back side of the medium substrate, the number of turns of the spiral coil on the right side of the resonator is the same as the number of turns of the spiral coil on the left side of the resonator arranged on the back side of the medium substrate, winding directions of the two resonators are the same, negative dielectric constant and magnetic permeability can be achieved by adjusting the number of turns difference |N-M|, N represents the number of turns of the spiral coil on the left side of the resonator arranged on the front side of the medium substrate, the number of turns of the spiral coil on the right side is M, and negative dielectric constant and magnetic permeability can be achieved by adjusting the number of turns difference |N-M|.
In this embodiment, n=14 and m=6 are taken, the periphery of the coil is 18.2 cm long and 9.15 cm wide, the distance between adjacent metal wires in the coil is 0.15 cm, and the metal wire width is 0.15 cm.
The resonator is composed of two rectangular spiral coils which are connected in series in an inverse mode, copper is selected in the aspect of materials, the size of the resonator is adjustable according to specific conditions, and finally the system resonant frequency is 13.57MHz.
In this embodiment, FR-4 is used as the dielectric substrate material, and has a dielectric constant of 4.3, a thickness of 1.2 mm, a length of 20 cm, and a width of 20 cm.
The working frequency of the invention is 13.57MHz, compared with the kHz frequency, the resonant line length is reduced, the near field range is larger, and the coupling strength is increased. In order to ensure that the directions of currents on the wires are consistent during resonance, the total length l of the wires is less than or equal to lambda/2, lambda=c/v, lambda is the wavelength of electromagnetic waves, c is the propagation speed of the electromagnetic waves, and f is the frequency of the electromagnetic waves. The working frequency of the invention is MHz, and compared with kHz, the length of the resonant line is 1/1000 of that of the resonant line.
The use of magnetic ring dipole elements fabricated in the above dimensions for wireless energy transfer is shown in fig. 4 (a), where metamaterial-free and conventional negative permeability lens simulation fields are shown in fig. 4 (b), fig. 4 (c), respectively, for comparison. Therefore, the magnetic ring dipole can remarkably improve the efficiency of wireless energy transmission between two antennas.
In the invention, in a limited substrate space, the equivalent inductance is increased by the mode of spiralling and reversely connecting the two spiral coils in series, and the rectangular spiral structure is adopted to fully utilize the substrate space, so that the resonant frequency is effectively reduced. Meanwhile, the reverse series connection coil combination mode not only ensures that the current directions of the two coils are consistent, but also increases the current in the effective conductor for generating the magnetic ring dipole, thereby increasing the intensity of the magnetic ring dipole and further improving the wireless energy transmission radiation efficiency. By comparing the simulation with the situation without metamaterial and the traditional negative magnetic permeability lens, the magnetic ring dipole can be obtained, and the efficiency of wireless energy transmission between two antennas can be remarkably improved.
The embodiments described above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made in the equivalent manner, and are included in the scope of the present invention.
Claims (4)
1. The plane lens is characterized by comprising a magnetic ring dipole unit array or a single magnetic ring dipole unit, wherein the magnetic ring dipole unit comprises a dielectric substrate and two resonators with the same structure, the resonators are symmetrically arranged on the front side and the back side of the dielectric substrate, the two resonators are centrally symmetrical relative to the dielectric substrate, and the resonators are formed by two spiral coils;
the resonator special winding method positioned on the front surface of the dielectric substrate comprises the following steps: a metal wire is firstly wound clockwise for N circles to form a left coil, then the tail end of the metal wire is further wound anticlockwise for M circles to form a right coil, the starting point of the spiral coil of the resonator is arranged in the left coil, and the end point of the spiral coil of the resonator is arranged in the right coil; the equivalent inductance is increased by the mode of spiralling and reversely connecting the two coils in series, and the mode of reversely connecting the coils in series not only ensures the consistent current direction of the two coils, but also increases the current in the effective conductor for generating the magnetic ring dipole, thereby increasing the intensity of the magnetic ring dipole and further improving the radiation efficiency of wireless energy transmission;
the negative dielectric constant and magnetic permeability are realized by adjusting the turn number difference |N-M|;
in order to ensure that the current directions of the left coil and the right coil of the resonator positioned on the front side of the dielectric substrate are consistent when in resonance, the total length l of the metal wire is less than or equal to lambda/2, lambda=c/f, lambda is the wavelength of electromagnetic waves, c is the propagation speed of the electromagnetic waves, and f is the frequency of the electromagnetic waves.
2. The planar lens of claim 1, wherein centers of the two spiral coils are on the same horizontal line.
3. The planar lens of claim 1, wherein adjacent metal lines in the left side spiral coil and the right side spiral coil have a pitch of 0.15 cm and a metal line width of 0.15 cm.
4. The planar lens according to claim 1, wherein the spiral coil is embodied as a rectangular spiral coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710102836.6A CN106711617B (en) | 2017-02-24 | 2017-02-24 | Plane lens for focusing and amplifying near magnetic field by utilizing magnetic ring dipole |
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| CN201710102836.6A CN106711617B (en) | 2017-02-24 | 2017-02-24 | Plane lens for focusing and amplifying near magnetic field by utilizing magnetic ring dipole |
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| CN106711617A CN106711617A (en) | 2017-05-24 |
| CN106711617B true CN106711617B (en) | 2023-08-22 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0374915A (en) * | 1989-08-16 | 1991-03-29 | Murata Mfg Co Ltd | Dielectric resonator |
| JP2005260382A (en) * | 2004-03-09 | 2005-09-22 | Sony Corp | Dipole antenna |
| WO2011122162A1 (en) * | 2010-03-31 | 2011-10-06 | 株式会社村田製作所 | Composite antenna and composite wireless communication device |
| CN102683880A (en) * | 2012-04-28 | 2012-09-19 | 深圳光启创新技术有限公司 | Metamaterial and MRI (magnetic resonance imaging) magnetic signal enhancer |
| CN103367921A (en) * | 2012-03-31 | 2013-10-23 | 深圳光启创新技术有限公司 | Meta-material and MRI magnetic signal enhancement device |
| CN204044346U (en) * | 2014-08-26 | 2014-12-24 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
| CN206834334U (en) * | 2017-02-24 | 2018-01-02 | 华南理工大学 | It is a kind of that the planar lens for amplifying nearly magnetic field is focused on using magnet ring dipole |
-
2017
- 2017-02-24 CN CN201710102836.6A patent/CN106711617B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0374915A (en) * | 1989-08-16 | 1991-03-29 | Murata Mfg Co Ltd | Dielectric resonator |
| JP2005260382A (en) * | 2004-03-09 | 2005-09-22 | Sony Corp | Dipole antenna |
| WO2011122162A1 (en) * | 2010-03-31 | 2011-10-06 | 株式会社村田製作所 | Composite antenna and composite wireless communication device |
| CN103367921A (en) * | 2012-03-31 | 2013-10-23 | 深圳光启创新技术有限公司 | Meta-material and MRI magnetic signal enhancement device |
| CN102683880A (en) * | 2012-04-28 | 2012-09-19 | 深圳光启创新技术有限公司 | Metamaterial and MRI (magnetic resonance imaging) magnetic signal enhancer |
| CN204044346U (en) * | 2014-08-26 | 2014-12-24 | 国家电网公司 | A kind of planar radio frequency coils for nuclear magnetic resonance |
| CN206834334U (en) * | 2017-02-24 | 2018-01-02 | 华南理工大学 | It is a kind of that the planar lens for amplifying nearly magnetic field is focused on using magnet ring dipole |
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| CN106711617A (en) | 2017-05-24 |
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