WO2017000769A1 - Nfc天线 - Google Patents

Nfc天线 Download PDF

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Publication number
WO2017000769A1
WO2017000769A1 PCT/CN2016/085722 CN2016085722W WO2017000769A1 WO 2017000769 A1 WO2017000769 A1 WO 2017000769A1 CN 2016085722 W CN2016085722 W CN 2016085722W WO 2017000769 A1 WO2017000769 A1 WO 2017000769A1
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WO
WIPO (PCT)
Prior art keywords
coil
substrate
nfc antenna
coils
present
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PCT/CN2016/085722
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English (en)
French (fr)
Inventor
陈亚娟
崔文镛
王发平
Original Assignee
比亚迪股份有限公司
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Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to US15/739,196 priority Critical patent/US20180191069A1/en
Priority to EP16817133.8A priority patent/EP3319173A4/en
Publication of WO2017000769A1 publication Critical patent/WO2017000769A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support

Definitions

  • the present invention relates to the field of wireless communications, and in particular to an NFC antenna.
  • NFC Near Field Communication
  • the NFC antenna in the related art adopts a planar coil type structure, and the inductance thereof is low. In a high loss environment close to metal, the inductance of the existing NFC antenna is drastically lowered, and communication cannot be completed.
  • the present invention aims to solve at least one of the above technical problems in the related art to some extent.
  • the present invention proposes an NFC antenna capable of generating a high inductance in a small size and capable of performing communication in a high loss environment close to metal.
  • an NFC antenna comprising: at least two coils, the at least two coils being spaced apart from each other and connected in series or in parallel to form an antenna line; at least one substrate, Said at least two coils are disposed on said at least one substrate and adjacent ones of said at least two coils are spaced apart by one of said at least one substrate, said adjacent two coils being said Projections on the one of the at least one substrate at least partially overlap, and the at least one substrate is provided with a feed point connected to the antenna line, the antenna line having a resonant frequency of 15-30 MHz.
  • the NFC antenna according to an embodiment of the present invention can generate a high inductance in a small size, and can perform communication in a high loss environment close to metal.
  • the NFC antenna according to the above embodiment of the present invention may further have the following additional technical features:
  • the antenna line has a resonant frequency of 15-20 MHz.
  • the adjacent two coils are connected by via holes provided on the one of the at least one substrate.
  • the feed points are two and are respectively located at the beginning and the end of the antenna line.
  • the at least one substrate is a flexible board or a rigid board.
  • the at least two coils are conductive ink or silver paste printed on the at least one substrate.
  • the sky NFC line includes: a substrate having a first surface and a second surface opposite in a thickness direction thereof; a first coil and a second coil, the first coil Provided on the first surface, The second coil is disposed on the second surface, and the first coil and the second coil are connected and the projections on the substrate at least partially overlap.
  • the NFC antenna further includes two feed points, the two feed points being spaced apart on the first surface, wherein the two feed points One is connected to an inner end of the first coil, and the other of the two feeding points is connected to an inner end of the second coil, and an outer end of the first coil and a second coil The outer ends are connected.
  • the substrate has a dielectric constant of 4.0 and a thickness of 30 ⁇ m, and an overlapping area of the projection of the first coil and the second coil on the substrate is 34-135 mm 2 .
  • the substrate has a dielectric constant of 4.3 and a thickness of 30 ⁇ m, and a projected area of the first coil and the second coil on the substrate is 32-126 mm 2 .
  • FIG. 1 is a schematic diagram of a front side of an NFC antenna in accordance with an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the back side of an NFC antenna in accordance with an embodiment of the present invention.
  • FIG. 3 is a perspective view of an NFC antenna in accordance with an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a front side of an NFC antenna in accordance with another embodiment of the present invention.
  • FIG. 5 is a schematic illustration of the back side of an NFC antenna in accordance with another embodiment of the present invention.
  • FIG. 6 is a perspective view of an NFC antenna in accordance with another embodiment of the present invention.
  • FIG. 7 is a graph showing an inductance resonance of an NFC antenna according to an embodiment of the present invention.
  • NFC antenna 1 substrate 10, feed point 11, via 12, first coil 20, and second coil 30.
  • an NFC antenna 1 includes at least one substrate 10 and at least two coils.
  • the at least two coils are spaced apart from one another and connected in series or in parallel to form an antenna line.
  • the at least two coils are disposed on at least one substrate 10, and two adjacent ones of the at least two coils are spaced apart by one of the at least one substrate 10, and at least one of the at least two coils of the at least two coils is at least one
  • the projections on one of the substrates 10 at least partially overlap, and at least one of the substrates 10 is provided with a feed point 11 connected to the antenna line.
  • the current flows in the same direction when viewed from the same direction. That is, it is the same counterclockwise flow, or the same clockwise flow, so that the current with the same flow direction produces the magnetic flux in the same direction, the magnetic flux is superimposed, and the performance is better.
  • the NFC antenna 1 of the embodiment of the present invention at least two coils are disposed, and projections of adjacent ones of the at least two coils on one of the at least one substrate 10 at least partially overlap, which can be adjusted.
  • the overlapping area of the projections of the two adjacent coils on one substrate 10 increases the capacitance, thereby reducing the resonant frequency of the antenna line, so that the resonant frequency of the antenna line is close to 13.56 MHz, and the inductance of the antenna line is at 13.56 MHz.
  • a mutation occurs nearby (as shown in Figure 7) to obtain a higher inductance.
  • the NFC antenna 1 can be applied in a high-loss environment such as near metal, and its inductance is only lowered to a normal level after the antenna line is affected, so that wireless communication can still be completed. Therefore, the NFC antenna 1 according to the embodiment of the present invention can generate a higher inductance in a smaller size, thereby enabling communication to be completed in a high-loss environment such as near metal.
  • an NFC antenna 1 according to an embodiment of the present invention includes at least one substrate 10 and at least two coils.
  • the overlap area of the projections such that the resonant frequency of the antenna line is 15-30 MHz.
  • the resonant frequency of the antenna line is 15-20 MHz.
  • the adjacent two coils are connected by a via hole 12 provided on the substrate 10, and the feeding points 11 are two, and the two feeding points 11 are respectively located at the beginning end and the end of the antenna line.
  • the NFC antenna 1 may be a flexible circuit board (FPC) or a printed circuit board (PCB) as a whole.
  • the substrate 10 is a flexible board or a rigid board.
  • the invention is not limited thereto, and the at least two coils may also be conductive ink or silver paste printed on the substrate 10.
  • an NFC antenna in accordance with the present invention includes a substrate 10 and two coils, a first coil 20 and a second coil 30.
  • the substrate 10 has a first surface and a second surface opposite in the thickness direction thereof.
  • the first coil 20 is wound around the outer circumference of the first surface of the substrate 10 in the circumferential direction of the substrate 10
  • the second coil 30 is wound around the outer circumference of the second surface of the substrate 10 in the circumferential direction of the substrate 10, the first coil 20
  • the second coil 30 is connected, and the projections of the first coil 20 and the second coil 30 on the substrate 10 at least partially overlap.
  • the outer end of the first coil 20 and the outer end of the second coil 30 are connected by a via 12 on the substrate 10.
  • Two feed points 11 are spaced apart on the first surface of the substrate 10, wherein one feed point 11 is connected to the inner end of the first coil 20 and the other feed point 11 passes through the via 12 on the substrate 10. It is connected to the inner end of the second coil 30.
  • the dielectric constant of the substrate 10 is 4.0 and the thickness is 30 ⁇ m, and the overlapping area of the projections of the first coil 20 and the second coil 30 on the substrate 10 is 34-135mm 2 to ensure that the resonant frequency of the antenna line is 15-20MHz.
  • the NFC antenna 1 as a whole is an FPC.
  • the length of the substrate 10 is 30 mm and the width is 20 mm, and both the first coil 20 and the second coil 30 are 2 turns, and the line width and the line pitch of the first coil 20 and the second coil 30 are both 0.5 mm, thereby the prior art
  • the person can calculate the inductance value of the coil according to the prior art.
  • the substrate 10 is made of polyimide (PI) and has a thickness of 30 ⁇ m, and the resonant frequency of the antenna line is 20 MHz.
  • the S value of the capacitance of 90 picofarads is calculated to be 76 mm 2 . Therefore, the overlapping area of the projection of the first coil 20 and the second coil 30 on the substrate 10 is adjusted to 76 mm 2 .
  • f is the resonant frequency of the antenna line
  • L is the inductance of the antenna line
  • ⁇ is the dielectric constant 4.0 of the substrate 10
  • ⁇ 0 is the vacuum dielectric constant 8.85e-12F/m
  • S is the first coil 20 and the second coil
  • d is the pitch of the first coil 20 and the second coil 30 (i.e., the thickness of the substrate 10).
  • the NFC antenna 1 and the existing NFC antenna according to an embodiment of the present invention are separately tested using a network analyzer.
  • an existing NFC antenna having a size of 30 ⁇ 20 mm, a coil number of 4, and a coil line width and a line pitch of 0.5 mm is used as a test object.
  • the existing antenna has a resonant frequency of 85 MHz.
  • the inductance of the existing NFC antenna at 13.56 MHz was measured to be 0.8 microhenries, while the inductance of the NFC antenna 1 according to the embodiment of the present invention was 2.3 microhenries at 13.56 MHz.
  • the NFC antenna 1 according to the embodiment of the present invention can achieve the inductance of the existing NFC antenna using the 10-turn line by using four turns of the line, and therefore, in the case where the inductance is the same, the NFC antenna according to the embodiment of the present invention
  • the size of 1 can be reduced by 3/4 compared to the size of the existing NFC antenna.
  • the NFC antenna 1 according to an embodiment of the present invention can generate a higher inductance with a smaller number of coils, for example, 3-6 times the inductance of the existing NFC antenna, in a high-loss environment such as near metal. Therefore, the NFC antenna 1 according to the embodiment of the present invention is drastically lowered to a normal level after being affected by a high-loss environment such as metal, so that the communication function can still be completed.
  • the dielectric constant of the substrate 10 is 4.3 and the thickness is 30 ⁇ m, and the overlapping area of the projection of the first coil 20 and the second coil 30 on the substrate 10 is shown. It is 32-126mm 2 to ensure that the resonant frequency of the antenna line is 15-20MHz.
  • the NFC antenna 1 is a PCB as a whole.
  • the length of the substrate 10 is 30 mm and the width is 20 mm, and both the first coil 20 and the second coil 30 are 2 turns, and the line width and the line pitch of the first coil 20 and the second coil 30 are both 0.5 mm, thereby the prior art
  • the person can calculate the inductance value of the coil according to the prior art.
  • the substrate 10 was an epoxy glass cloth laminate (FR4) and had a thickness of 30 ⁇ m, and the resonance frequency of the antenna line was 20 MHz.
  • the calculated S value of the capacitance of 90 picofarads is 71 mm 2 . Therefore, the overlapping area of the projection of the first coil 20 and the second coil 30 on the substrate 10 is adjusted to 71 mm 2 .
  • f is the resonant frequency of the antenna line
  • L is the inductance of the antenna line
  • ⁇ is the dielectric constant 4.3 of the substrate 10
  • ⁇ 0 is the vacuum dielectric constant 8.85e-12F/m
  • S is the first coil 20 and the second coil
  • d is the pitch of the first coil 20 and the second coil 30 (i.e., the thickness of the substrate 10).
  • the NFC antenna 1 and the existing NFC antenna according to an embodiment of the present invention are separately tested using a network analyzer.
  • an existing NFC antenna having a size of 30 ⁇ 20 mm, a coil number of 4, and a coil line width and a line pitch of 0.5 mm is used as a test object.
  • the existing antenna has a resonant frequency of 85 MHz.
  • the inductance of the existing NFC antenna at 13.56 MHz was measured to be 0.8 microhenries, while the inductance of the NFC antenna 1 according to the embodiment of the present invention was 2.4 microhenries at 13.56 MHz.
  • the NFC antenna 1 according to the embodiment of the present invention can achieve the inductance of the existing NFC antenna using the 10-turn line by using four turns of the line, and therefore, in the case where the inductance is the same, the NFC antenna according to the embodiment of the present invention
  • the size of 1 can be reduced by 3/4 compared to the size of the existing NFC antenna.
  • the NFC antenna 1 according to an embodiment of the present invention can generate a higher inductance with a smaller number of coils, for example, 3-6 times the inductance of the existing NFC antenna, in a high-loss environment such as near metal. Therefore, the inductance of the NFC antenna 1 according to the embodiment of the present invention is drastically lowered to a normal level after being affected by a high-loss environment such as metal, so that the communication function can still be completed.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may include one or more of the features either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements.
  • installation can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. Not directly contact but through Additional features are in contact between them.
  • the first feature “above”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

Abstract

本发明公开了一种NFC天线，所述NFC天线包括：至少两个线圈，所述至少两个线圈彼此间隔设置且串联或并联成天线线路；至少一个基板，所述至少两个线圈设在所述至少一个基板上且所述至少两个线圈中相邻的两个线圈通过所述至少一个基板中的一个间隔开，所述相邻的两个线圈在所述至少一个基板中的所述一个上的投影至少部分重叠，所述至少一个基板上设有与所述天线线路相连的馈电点，所述天线线路的谐振频率为15-30MHz。

Description

NFC天线 技术领域
本发明涉及无线通讯领域，具体而言，涉及一种NFC天线。
背景技术
近场通信(Near Field Communication，NFC)是一种短距高频的无线电技术，在13.56MHz频率运行于20cm距离内。相关技术中的NFC天线采用平面线圈式结构，其电感较低，在靠近金属等高损耗环境下，现有的NFC天线的电感会急剧下降，导致无法完成通讯。
发明内容
本发明旨在至少在一定程度上解决相关技术中的上述技术问题之一。为此，本发明提出一种NFC天线，该NFC天线能够以较小的尺寸产生较高的电感，能够在靠近金属等高损耗环境下完成通讯。
为实现上述目的，根据本发明的实施例提出一种NFC天线，所述NFC天线包括：至少两个线圈，所述至少两个线圈彼此间隔设置且串联或并联成天线线路；至少一个基板，所述至少两个线圈设在所述至少一个基板上且所述至少两个线圈中相邻的两个线圈通过所述至少一个基板中的一个间隔开，所述相邻的两个线圈在所述至少一个基板中的所述一个上的投影至少部分重叠，所述至少一个基板上设有与所述天线线路相连的馈电点，所述天线线路的谐振频率为15-30MHz。
根据本发明实施例的NFC天线能够以较小的尺寸产生较高的电感，能够在靠近金属等高损耗环境下完成通讯。
另外，根据本发明上述实施例的NFC天线还可以具有如下附加的技术特征：
根据本发明的一个实施例，所述天线线路的谐振频率为15-20MHz。
根据本发明的一个实施例，所述相邻的两个线圈通过设在所述至少一个基板中的所述一个上的过孔相连。
根据本发明的一个实施例，所述馈电点为两个且分别位于所述天线线路的起始端和末端。
根据本发明的一个实施例，所述至少一个基板为柔性板或刚性板。
根据本发明的一个实施例，所述至少两个线圈为印刷在所述至少一个基板上的导电油墨或银浆。
根据本发明的一个实施例，所述天NFC线包括：一个基板，所述基板具有在其厚度方向上相对的第一表面和第二表面；第一线圈和第二线圈，所述第一线圈设在所述第一表面上， 所述第二线圈设在所述第二表面上，所述第一线圈和所述第二线圈相连且在所述基板上的投影至少部分重叠。
根据本发明的一个实施例，所述NFC天线进一步包括两个馈电点，所述两个馈电点间隔开地设在所述第一表面上，其中，所述两个馈电点中的一个与所述第一线圈的内端相连，所述两个馈电点中的另一个与所述第二线圈的内端相连，并且所述第一线圈的外端和所述第二线圈的外端相连。
根据本发明的一个实施例，所述基板的介电常数为4.0且厚度为30μm，所述第一线圈和所述第二线圈在所述基板上的投影的重叠面积为34-135mm2。
根据本发明的一个实施例，所述基板的介电常数为4.3且厚度为30μm，所述第一线圈和所述第二线圈在所述基板上的投影的重叠面积为32-126mm2。
附图说明
图1是根据本发明实施例的NFC天线的正面的示意图。
图2是根据本发明实施例的NFC天线的背面的示意图。
图3是根据本发明实施例的NFC天线的透视图。
图4是根据本发明另一个实施例的NFC天线的正面的示意图。
图5是根据本发明另一个实施例的NFC天线的背面的示意图。
图6是根据本发明另一个实施例的NFC天线的透视图。
图7是根据本发明实施例的NFC天线的电感谐振曲线图。
附图标记：NFC天线1、基板10、馈电点11、过孔12、第一线圈20、第二线圈30。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参考附图描述根据本发明实施例的NFC天线1。
如图1-图7所示，根据本发明实施例的NFC天线1包括至少一个基板10和至少两个线圈。
所述至少两个线圈彼此间隔设置且串联或并联成天线线路。所述至少两个线圈设在至少一个基板10上，至少两个线圈中相邻的两个线圈通过至少一个基板10中的一个间隔开，至少两个线圈中相邻的两个线圈在至少一个基板10中的一个上的投影至少部分重叠，至少一个基板10上设有与所述天线线路相连的馈电点11。
本领域的技术人员需要理解地是，不同线圈层叠后，从同一方向看，电流的流向相同， 即同是逆时针流动，或者同是顺时针流动,由此具有相同流向的电流产生相同方向的磁通，磁通叠加，性能更好。
根据本发明实施例的NFC天线1，通过设置至少两个线圈，且所述至少两个线圈中相邻的两个线圈在至少一个基板10中的一个上的投影至少部分重叠，这样可以通过调节所述相邻的两个线圈在一个基板10上的投影的重叠面积来增大电容，从而降低天线线路的谐振频率，使天线线路的谐振频率接近13.56MHz，进而使天线线路的电感在13.56MHz附近发生突变(如图7所示)，以获得较高的电感。由此，NFC天线1可以应用在靠近金属等高损耗环境下，在天线线路受到影响后其电感仅下降至正常水平，从而仍然能够完成无线通讯。因此，根据本发明实施例的NFC天线1能够以较小的尺寸产生较高的电感，进而能够在靠近金属等高损耗环境下完成通讯。
下面参考附图描述根据本发明具体实施例的NFC天线1。
在本发明的一些具体实施例中，如图1-图7所示，根据本发明实施例的NFC天线1包括至少一个基板10和至少两个线圈。
其中，为了保证天线线路的电感在13.56MHz附近发生突变，根据公式f＝1/[2π√(LC)]和C＝ε*ε0*S/d，调节相邻的两个线圈在基板10上的投影的重叠面积，从而使所述天线线路的谐振频率为15-30MHz。优选地，所述天线线路的谐振频率为15-20MHz。
具体地，相邻的两个线圈通过设在基板10上的过孔12相连，馈电点11为两个，两个馈电点11分别位于所述天线线路的起始端和末端。
可选地，NFC天线1整体可以为柔性电路板(FPC)或印制电路板(PCB)。换言之，基板10为柔性板或刚性板。
当然，本发明并不限于此，所述至少两个线圈也可以为印刷在基板10上的导电油墨或银浆。
在本发明的一些具体实施例中，如图1-图6所示，根据本发明的NFC天线包括一个基板10和两个线圈，即第一线圈20和第二线圈30。基板10具有在其厚度方向上相对的第一表面和第二表面。第一线圈20沿基板10的周向盘绕在基板10的第一表面的外周缘处，第二线圈30沿基板10的周向盘绕在基板10的第二表面的外周缘处，第一线圈20和第二线圈30相连，且第一线圈20和第二线圈30在基板10上的投影至少部分重叠。
具体而言，第一线圈20的外端和第二线圈30的外端通过基板10上的过孔12相连。两个馈电点11间隔开地设在基板10的第一表面上，其中，一个馈电点11与第一线圈20的内端相连，另一个馈电点11通过基板10上的过孔12与第二线圈30的内端相连。
在本发明的一些具体示例中，如图1-图3所示，基板10的介电常数为4.0且厚度为30μm，第一线圈20和第二线圈30在基板10上的投影的重叠面积为34-135mm2，以保证天线线路 的谐振频率为15-20MHz。
举例而言，NFC天线1整体为FPC。基板10的长度为30mm且宽度为20mm，第一线圈20和第二线圈30均为2圈，第一线圈20和第二线圈30的线宽和线距均为0.5mm，由此本领域技术人员可根据现有技术计算得出线圈的电感值。另外，基板10由聚酰亚胺(PI)制成且厚度为30μm，天线线路的谐振频率为20MHz。
进一步地，根据公式f＝1/[2π√(LC)]，可得C＝90皮法。忽略平行线间的电容，为使不同层之间的平面电容为90皮法，根据C＝ε*ε0*S/d，计算得电容为90皮法时的S值为76mm2。因此将第一线圈20和第二线圈30在基板10上的投影的重叠面积调整为76mm2。
其中，f为天线线路的谐振频率，L为天线线路的电感，ε为基板10的介电常数4.0，ε0为真空介电常数8.85e-12F/m，S为第一线圈20和第二线圈30在基板10上的投影的重叠面积，d为第一线圈20和第二线圈30的间距(即基板10的厚度)。
采用网络分析仪分别测试根据本发明实施例的NFC天线1和现有NFC天线。其中，以尺寸为30x20mm，线圈圈数为4，线圈的线宽和线距均为0.5mm的现有NFC天线为测试对象。该现有天线的谐振频率为85MHz。
测得现有NFC天线在13.56MHz时电感为0.8微亨，而根据本发明实施例的NFC天线1在13.56MHz时电感为2.3微亨。
通过对比测试结果，根据本发明实施例的NFC天线1采用4圈线路就可以达到采用10圈线路的现有NFC天线的电感，因此，在电感相同的情况下，根据本发明实施例的NFC天线1的尺寸相较于现有NFC天线的尺寸可以减小3/4。此外，在靠近金属等高损耗环境下，根据本发明实施例的NFC天线1可以用较少圈数的线圈产生较高的电感，例如达到现有NFC天线的电感的3-6倍。因此，根据本发明实施例的NFC天线1在受到靠近金属等高损耗环境的影响后，电感急剧下降至正常水平，从而仍然能够完成通讯功能。
在本发明的另一些具体示例中，如图4-图6所示，基板10的介电常数为4.3且厚度为30μm，第一线圈20和第二线圈30在基板10上的投影的重叠面积为32-126mm2，以保证天线线路的谐振频率为15-20MHz。
举例而言，NFC天线1整体为PCB。基板10的长度为30mm且宽度为20mm，第一线圈20和第二线圈30均为2圈，第一线圈20和第二线圈30的线宽和线距均为0.5mm，由此本领域技术人员可根据现有技术计算得出线圈的电感值。另外，基板10为环氧玻璃布层压板(FR4)且厚度为30μm，天线线路的谐振频率为20MHz。
进一步地，根据公式f＝1/[2π√(LC)]，可得C＝90皮法。忽略平行线间的电容，为使不同层之间的平面电容为90皮法，根据C＝ε*ε0*S/d，计算得电容为90皮法时的S值为71mm2。因此将第一线圈20和第二线圈30在基板10上的投影的重叠面积调整为71mm2。
其中，f为天线线路的谐振频率，L为天线线路的电感，ε为基板10的介电常数4.3，ε0为真空介电常数8.85e-12F/m，S为第一线圈20和第二线圈30在基板10上的投影的重叠面积，d为第一线圈20和第二线圈30的间距(即基板10的厚度)。
采用网络分析仪分别测试根据本发明实施例的NFC天线1和现有NFC天线。其中，以尺寸为30x20mm，线圈圈数为4，线圈的线宽和线距均为0.5mm的现有NFC天线为测试对象。该现有天线的谐振频率为85MHz。
测得现有NFC天线在13.56MHz时电感为0.8微亨，而根据本发明实施例的NFC天线1在13.56MHz时电感为2.4微亨。
通过对比测试结果，根据本发明实施例的NFC天线1采用4圈线路就可以达到采用10圈线路的现有NFC天线的电感，因此，在电感相同的情况下，根据本发明实施例的NFC天线1的尺寸相较于现有NFC天线的尺寸可以减小3/4。此外，在靠近金属等高损耗环境下，根据本发明实施例的NFC天线1可以用较少圈数的线圈产生较高的电感，例如达到现有NFC天线的电感的3-6倍。因此，根据本发明实施例的NFC天线1在受到靠近金属等高损耗环境的影响后，其电感急剧下降至正常水平，从而仍然能够完成通讯功能。
根据本发明实施例的NFC天线1的其他构成以及操作对于本领域普通技术人员而言都是已知的，这里不再详细描述。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过 它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。此外，本领域的技术人员可以将本说明书中描述的不同实施例或示例进行接合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (10)

  1. 一种NFC天线，其特征在于，包括：
    至少两个线圈，所述至少两个线圈彼此间隔设置且串联或并联成天线线路；
    至少一个基板，所述至少两个线圈设在所述至少一个基板上且所述至少两个线圈中相邻的两个线圈通过所述至少一个基板中的一个间隔开，所述相邻的两个线圈在所述至少一个基板中的所述一个上的投影至少部分重叠，所述至少一个基板上设有与所述天线线路相连的馈电点，所述天线线路的谐振频率为15-30MHz。
  2. 根据权利要求1所述的NFC天线，其特征在于，所述天线线路的谐振频率为15-20MHz。
  3. 根据权利要求1或2所述的NFC天线，其特征在于，所述相邻的两个线圈通过设在所述至少一个基板中的所述一个上的过孔相连。
  4. 根据权利要求1-3中任一项所述的NFC天线，其特征在于，所述馈电点为两个且分别位于所述天线线路的起始端和末端。
  5. 根据权利要求1-4中任一项所述的NFC天线，其特征在于，所述至少一个基板为柔性板或刚性板。
  6. 根据权利要求1-5中任一项所述的NFC天线，其特征在于，所述至少两个线圈为印刷在所述至少一个基板上的导电油墨或银浆。
  7. 根据权利要求1-6中任一项所述的NFC天线，包括：
    一个基板，所述基板具有在其厚度方向上相对的第一表面和第二表面；
    第一线圈和第二线圈，所述第一线圈设在所述第一表面上，所述第二线圈设在所述第二表面上，所述第一线圈和所述第二线圈相连且在所述基板上的投影至少部分重叠。
  8. 根据权利要求7所述的NFC天线，进一步包括两个馈电点，所述两个馈电点间隔开地设在所述第一表面上，其中，所述两个馈电点中的一个与所述第一线圈的内端相连，所述两个馈电点中的另一个与所述第二线圈的内端相连，并且所述第一线圈的外端和所述第二线圈的外端相连。
  9. 根据权利要求7或8所述的NFC天线，其特征在于，所述基板的介电常数为4.0且厚度为30μm，所述第一线圈和所述第二线圈在所述基板上的投影的重叠面积为34-135mm2。
  10. 根据权利要求7或8所述的NFC天线，其特征在于，所述基板的介电常数为4.3且厚度为30μm，所述第一线圈和所述第二线圈在所述基板上的投影的重叠部分的面积为32-126mm2。
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Publication number Priority date Publication date Assignee Title
WO2020223723A1 (en) 2019-05-02 2020-11-05 Enhale Medical, Inc. Implantable stimulation power receiver, systems and methods
EP4045134A1 (en) 2019-10-15 2022-08-24 XII Medical, Inc. Biased neuromodulation lead and method of using same
CN111508340B (zh) * 2020-04-26 2022-04-05 厦门天马微电子有限公司 一种显示模组、制备方法以及显示装置
US11691010B2 (en) 2021-01-13 2023-07-04 Xii Medical, Inc. Systems and methods for improving sleep disordered breathing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2888666Y (zh) * 2005-11-14 2007-04-11 北京握奇数据系统有限公司 供插入式智能卡非接触界面使用的天线组件
CN102608662A (zh) * 2012-03-23 2012-07-25 刘冀成 基于瞬变电磁法的探测装置
CN102646866A (zh) * 2012-04-17 2012-08-22 中兴通讯股份有限公司 一种近距离无线通讯天线及终端设备
CN103765675A (zh) * 2012-06-04 2014-04-30 株式会社村田制作所 天线装置及通信终端设备
US20140184462A1 (en) * 2012-06-04 2014-07-03 Murata Manufacturing Co., Ltd. Antenna module and radio communication device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689636A (en) * 1985-03-15 1987-08-25 Minnesota Mining And Manufacturing Company Deactivatable resonant marker for use in RF electronic article surveillance system
KR101161361B1 (ko) * 2004-03-26 2012-06-29 가부시키가이샤 한도오따이 에네루기 켄큐쇼 반도체장치
WO2010066955A1 (fr) * 2008-12-11 2010-06-17 Yves Eray Circuit d'antenne rfid
DE102009004130A1 (de) * 2009-01-05 2010-07-08 Leonhard Kurz Stiftung & Co. Kg Mehrschichtiges Folienelement
JP5435130B2 (ja) * 2010-06-18 2014-03-05 株式会社村田製作所 通信端末機器及びアンテナ装置
JP5505505B2 (ja) * 2010-07-29 2014-05-28 株式会社村田製作所 共振回路及びアンテナ装置
CN202009072U (zh) * 2011-02-25 2011-10-12 比亚迪股份有限公司 一种近场通讯天线
DE102013102051A1 (de) * 2013-03-01 2014-09-04 Infineon Technologies Ag Boosterantenne, Kontaktlos-Chip-Anordnung, Antennenstruktur, und Chip-Anordnung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2888666Y (zh) * 2005-11-14 2007-04-11 北京握奇数据系统有限公司 供插入式智能卡非接触界面使用的天线组件
CN102608662A (zh) * 2012-03-23 2012-07-25 刘冀成 基于瞬变电磁法的探测装置
CN102646866A (zh) * 2012-04-17 2012-08-22 中兴通讯股份有限公司 一种近距离无线通讯天线及终端设备
CN103765675A (zh) * 2012-06-04 2014-04-30 株式会社村田制作所 天线装置及通信终端设备
US20140184462A1 (en) * 2012-06-04 2014-07-03 Murata Manufacturing Co., Ltd. Antenna module and radio communication device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3319173A4 *

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