WO2019204988A1 - Near field communication antenna system and terminal device - Google Patents

Near field communication antenna system and terminal device Download PDF

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Publication number
WO2019204988A1
WO2019204988A1 PCT/CN2018/084283 CN2018084283W WO2019204988A1 WO 2019204988 A1 WO2019204988 A1 WO 2019204988A1 CN 2018084283 W CN2018084283 W CN 2018084283W WO 2019204988 A1 WO2019204988 A1 WO 2019204988A1
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WO
WIPO (PCT)
Prior art keywords
resonant circuit
point
grounding point
control module
nfc
Prior art date
Application number
PCT/CN2018/084283
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French (fr)
Chinese (zh)
Inventor
王海坤
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201880069763.8A priority Critical patent/CN111279549B/en
Priority to PCT/CN2018/084283 priority patent/WO2019204988A1/en
Publication of WO2019204988A1 publication Critical patent/WO2019204988A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements

Definitions

  • the present application relates to the field of terminal technologies, and in particular, to a near field communication antenna system and a terminal device.
  • NFC-enabled terminal device has three functional modes: NFC terminal device as the reading device (reader) Mode), NFC terminal device as a device to be read (card emulation, that can be used as an integrated circuit card (IC) for credit cards, bus cards, etc.), point-to-point between NFC terminal devices (ie, between multiple terminal devices) Data interaction, similar to Bluetooth) communication applications. Therefore, after the NFC function is enabled, the terminal device will face many IC cards and point of sale (POS) machines. Due to the difference in resonance points between different IC cards and POS machines, the terminal devices must have certain compatibility.
  • POS point of sale
  • FIG. 1 shows an NFC antenna structure in a conventional technical solution, including: a flexible printed circuit (FPC) disposed in a metal frame 20 of the terminal device and located on the FPC. Coil 10.
  • FPC flexible printed circuit
  • the NFC antenna structure can also be implemented by using the metal frame of the terminal device.
  • a feed point (Feed, F) and a ground point (Ground, G) are set on the metal frame 20 at the top of the terminal device, and the metal frame 201 between the F point and the G point is used instead.
  • the coil shown in Figure 1 is constructed to form an NFC antenna.
  • the NFC antenna structure shown in FIG. 1 has a large space inside the terminal device due to the large area of the coil 10, which increases the cost.
  • the inductance value of the coil 10 is larger than the inductance value of the metal frame 20, and is not on the order of magnitude, and the resistance of the coil 10 and the resistance of the metal frame 20 are relatively small, generally on an order of magnitude, so the coil 10 is The Q value is relatively large, so the bandwidth of the NFC antenna is narrower.
  • the terminal device uses a metal back shell, since the metal back shell can shield part of the antenna signal, the performance of the NFC antenna is poor.
  • the metal frame 201 is used in place of the coil in FIG. 2, which is often incompatible with the POS machine in actual use.
  • the embodiment of the present application provides a near field communication antenna system and a terminal device for increasing the magnetic flux of the NFC antenna.
  • a first aspect of the present application provides a near field communication antenna system, which is applied to a terminal device, where the terminal device includes a metal frame, and the antenna system includes: a short-range wireless communication NFC control module disposed in the metal frame. a first resonant circuit and a second resonant circuit connected to the NFC control module, and a grounding point disposed in the metal frame; the metal frame has at least two intervals on different sides; wherein, the NFC control module For generating a differential signal; the first resonant circuit is further connected to the ground point for outputting a differential signal output by the NFC control module to the ground point; the second resonant circuit is further The grounding point is connected to feed a differential signal input to the second resonant circuit via the grounding point into the NFC control module.
  • the NFC control module includes a first feed point and a second feed point, wherein the first feed point is used to feed the differential signal into the first resonant circuit, and the second feed point is used to The differential signal input to the second resonant circuit at the ground point is fed into the NFC control module through the second feed point, or the differential signal is fed into the second resonant circuit.
  • a first resonant circuit is configured to output a differential signal fed by the first feed point to the ground point; and a second resonant circuit is further connected to the ground point for inputting the ground point The differential signal to the second resonant circuit is fed into the NFC control module through the second feed point.
  • the present application provides a near field communication antenna system, by providing a ground point in a metal frame to form a loop between the first resonant circuit and the second resonant circuit disposed in the metal frame and the ground point and the metal frame.
  • the differential signal output by the NFC control module can form a reflow along the loop, thereby increasing the circulating area of the differential signal and increasing the magnetic flux, thereby improving the performance of the NFC.
  • the antenna system provided by the present application and the other antennas share the same structure with higher degree of freedom, and at the same time, reduce the influence on the implementation and debugging of other antennas.
  • the metal frame is configured by the first frame and the second frame located above the first frame to form a frame having at least two intervals.
  • the first resonant circuit is the same as the second resonant circuit, the first resonant circuit includes: a first inductor, a first capacitor, and a second capacitor, wherein the first end of the first inductor is connected to the second frame The second end of the first inductor is connected to the first end of the first capacitor and the first end of the second capacitor, the second end of the first capacitor is grounded, and the second end of the second capacitor Connected to a first feed point of the NFC control module.
  • the ground point includes a first ground point and a second ground point, where the a grounding point is connected to the first resonant circuit, the second grounding point is connected to the second resonant circuit, and the first grounding point is located between the first resonant circuit and the second resonant circuit, And the second resonant circuit is located between the first ground point and the second ground point, and the first ground point and the second ground point are connected to the metal frame.
  • the second resonant circuit and the NFC control module are disposed with a shift a phase unit, the second feed point is further configured to feed the differential signal into the second resonant circuit, and the phase shifting unit is configured to convert the second feed point to the second a phase of the differential signal in the resonant circuit such that a phase of the differential signal fed to the second feed point into the second resonant circuit and the first feed point to the first resonant circuit
  • the phases of the differential signals are the same.
  • the grounding point includes a first ground point and a second node location, where The first grounding point is connected to the first resonant circuit, the second grounding point is connected to the second resonant circuit, and the first grounding point and the second grounding point are connected to the metal frame Or, in a case where the first grounding point is connected to the metal frame, the first grounding point and the second grounding point are located between the first resonant circuit and the second resonant circuit.
  • the first resonant circuit and the second resonant circuit are located in the Between a grounding point and the second grounding point, the first grounding point and the second grounding point are connected to the metal frame.
  • the access point is connected to the second frame by a metal block or a lock screw connection.
  • a second aspect of the present application provides a terminal device, where the terminal device includes a metal frame, and the metal frame has at least two intervals on different sides, and the terminal device further includes: A near field communication antenna system as described in any of the possible implementations of the aspect; a near field communication antenna system is used in the terminal device for transmitting signals and receiving signals.
  • FIG. 1 is a schematic diagram of an NFC antenna structure provided in the prior art
  • FIG. 2 is a schematic diagram of another NFC antenna structure provided in the prior art
  • FIG. 3 is a schematic diagram of carrier modulation according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram 1 of a near field communication antenna system according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram 2 of a near field communication antenna system according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram 3 of a near field communication antenna system according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram 4 of a near field communication antenna system according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram 5 of a near field communication antenna system according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram 6 of a near field communication antenna system according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram 7 of a near field communication antenna system according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram 8 of a near field communication antenna system according to an embodiment of the present disclosure.
  • Figure 12 is a schematic diagram 1 of the comparison provided by the embodiment of the present application.
  • FIG. 13 is a schematic diagram 2 of a comparison provided by an embodiment of the present application.
  • the frequency of the modulation signal be ⁇ 0
  • the carrier frequency be ⁇ c
  • the subcarrier frequency be ⁇ sub .
  • the modulation process in NFC communication is as shown in FIG. 3: First, the baseband signal first modulates the subcarrier ⁇ sub , and the modulated modulated wave again modulates the carrier signal ⁇ c as a baseband signal.
  • ⁇ 0 is the modulation signal frequency
  • ⁇ c is the carrier signal frequency
  • ⁇ sub is the subcarrier frequency.
  • different standards for example, ISO14443 A, ISO14443B, and ISO15693
  • the carrier signal ⁇ c operating frequency It is 13.56MHz and uses subcarrier modulation technology.
  • there may be frequency deviations when different subcarriers are modulated for example, the allowed frequency deviation is -7 kHz to +7 kHz).
  • the subcarrier frequencies used by different standards are different.
  • ISO14443 A and ISO14443 B use a subcarrier frequency of 847.5 kHz
  • ISO15693 uses a subcarrier frequency of 423 kHz
  • ISO14443 A requires a bit rate of 106 Kbit/s and ISO 14443B.
  • the bit rate required for the bit rate of 212 Kbit/s and ISO 15693 is 424 Kbit/s. Therefore, the terminal equipment is compatible with the above standards and needs to meet certain bandwidth requirements.
  • the bit rate of the baseband signal as 106 Kbit/s as an example, the specified frequency is 13.56 MHz, and because the subcarrier technology is adopted, the carriers are 12.71 MHz (13.56 MHz to 847.5 KHz) and 14.4 MHz, respectively.
  • the bandwidth (Band Width, BW) of the NFC antenna needs to include the bandwidth of two subcarriers.
  • the application from the antenna principle utilizes the differential signal characteristics in NFC antenna communication, introduces ground in the NFC antenna, increases the return path to generate at least two reflows, thereby generating double resonance to increase the bandwidth, and additionally making two reflows. In phase, this also increases the magnetic flux, which improves performance.
  • FIG. 4 illustrates a near field communication antenna system provided by the present application, which is applied to a terminal device having a metal frame 30, and the antenna system includes: a metal frame 30 disposed in the vicinity of the metal frame 30.
  • a second resonant circuit 60 is connected, and a ground point G disposed within the metal frame 30;
  • the metal frame 30 has at least two intervals on different sides (eg, interval A and interval B shown in FIG. 4).
  • the NFC control module 40 is configured to generate a differential signal, and the first feed point F 1 is used to feed the differential signal into the first resonant circuit 50.
  • the first resonant circuit 50 is further connected to the ground point G for The differential signal fed by a feed point F 1 is output to the ground point G.
  • the second resonant circuit 60 is also connected to the ground point G for feeding the differential signal input from the ground point G into the NFC control module 40 through the second feed point F 2 to form a loop.
  • the first feed point F 1 in the present application can feed the differential signal output by the NFC control module 40 into the first resonant circuit 50, or can feed the differential signal input from the ground point G into the NFC control module 40. .
  • the second feed point F 2 can feed the differential signal output by the NFC control module 40 into the second resonant circuit 60, or can feed the differential signal input from the ground point G into the NFC control module 40.
  • the first feed point F 1 and the second feed point F 2 are to input a differential signal to the NFC control module 40 or to output the differential signal from the NFC control module 40.
  • first feeding point F 1 and the second feeding point F 2 in the present application may be feeding points of the NFC control module 40 itself, or may be in other manners (for example, welding).
  • the two feed points fixed on the NFC control module 40 are not limited in this application.
  • the first feed point F 1 can ensure that the signal of the NFC control module is connected to the first resonant circuit 50
  • the second feed point F 2 can ensure that the signal of the NFC control module 40 is connected to the second resonant circuit 60. .
  • first feed point F 1 and the second feed point F 2 may be metal feet (sheets) or thimbles, which are not limited in this application.
  • the terminal device in this application may be a mobile phone, a tablet computer or a POS device.
  • the NFC control module 40 in the present application is configured to provide a differential signal.
  • the specific structure of the NFC control module 40 is not limited in the present application.
  • an NFC antenna is disposed in the metal frame in the present application.
  • the NFC control module 40 is disposed in the NFC antenna, and the NFC control module 40 generates a differential signal to the NFC antenna.
  • an NFC antenna (which can also receive signals, process signals, and complete final data transactions) can include near field communication chips (eg, NFC chips) and peripheral circuits.
  • the peripheral circuit may be a filter circuit and an antenna matching circuit, the near field communication chip and the filter circuit are connected, the filter circuit is connected with an antenna matching circuit, and the antenna matching circuit is connected to the first feed point and the second feed point. Point connection.
  • the present application provides a near field communication antenna system, by providing a ground point in a metal frame to form a loop between the first resonant circuit and the second resonant circuit disposed in the metal frame and the ground point and the metal frame.
  • the differential signal output by the NFC control module can form a reflow along the loop, thereby increasing the circulating area of the differential signal and increasing the magnetic flux, thereby improving the performance of the NFC.
  • the antenna system provided by the present application and the other antennas share the same structure with higher degree of freedom, and at the same time, reduce the influence on the implementation and debugging of other antennas.
  • the metal frame 30 in the present application is surrounded by a first frame 301 and a second frame 302 located above the first frame 301 to form a frame having at least two intervals.
  • the first frame 301 may include two first vertical frames and a first horizontal frame disposed in parallel, wherein two parallel first vertical frames are perpendicular to the first horizontal frame, and two The first vertical borders arranged in parallel are connected to the first horizontal border.
  • any one of the two first vertical frames disposed in parallel in the present application may include a first portion and a second portion, wherein the first portion and the second portion have a space therebetween, and the second portion is at a first level The border is connected.
  • the second frame 302 includes: two second vertical frames disposed in parallel, and a second horizontal frame, wherein the two parallel vertical frames are perpendicular to the second horizontal frame, and two parallel frames are disposed.
  • the second vertical border is connected to the second horizontal border.
  • the near field communication antenna system in the present application may further include other resonant circuits than the first resonant circuit 50 and the second resonant circuit 60.
  • the remaining resonant circuits refer to the first resonant circuit 50 and The second resonant circuit 60 is not pursued herein.
  • the NFC control module also has a third feed point for inputting a differential signal to the remaining resonant circuits.
  • the first resonant circuit 50 and the second resonant circuit 60 in the present application have the same structure.
  • the following embodiment details the specific structure of the first resonant circuit 50 and the second resonant circuit 60 by taking the first resonant circuit as an example.
  • the first resonant circuit 50 of the present application includes a first inductor 501, a first capacitor 502, and a second capacitor 503, wherein the first end of the first inductor 501 is connected to the second frame 302, The second end of the first capacitor 502 is connected to the first end of the first capacitor 502, the second end of the second capacitor 503 is grounded, and the second end of the second capacitor 503 is connected to the NFC control module.
  • the first feed point F 1 is connected.
  • the second resonant circuit 60 includes a first inductor 601, a first capacitor 602, and a second capacitor 603.
  • the first end of the first inductor 601 is connected to the second frame 302, and the second end of the first inductor 601 is first.
  • the first end of the capacitor 602 is connected to the first end of the second capacitor 603, the second end of the first capacitor 602 is grounded, and the second end of the second capacitor 603 is connected to the second feed point F 2 of the NFC control module.
  • first inductor 501, the first capacitor 502 and the second capacitor 503, the first inductor 601, the first capacitor 602 and the second capacitor 603 are all used to adjust the resonance point.
  • the first grounding point G1 and the second grounding point G2 represent the second frame 302 to the lower location of the PCB board disposed in the metal frame, and are also the lower points of the NFC control module.
  • the grounding point in this application may be a grounding point or a group of grounding points, which may include two or more grounding points. Since there is a gap between the first resonant circuit and the second resonant circuit, the number and position of the grounding points are changed, so the following will be described in conjunction with the specific embodiments:
  • the first feed point and the second feed point are both used to output the differential signal output by the NFC control module 40, the first feed point F 1 and the first feed point in the present application.
  • the phase difference between the two is 180° as an example.
  • the grounding point G may include a first grounding point G1 and a second grounding point G2, wherein the first grounding point G1 Connected to the first resonant circuit 50, the second ground point G2 is coupled to the second resonant circuit 60. (Note: If there is no gap in the middle of the second border 302 (or the middle is broken), only one G is used. If there is an interval, G1 and G2 are needed).
  • the first grounding point G1 and the second grounding point G2 may be located between the first resonant circuit 50 and the second resonant circuit 60, and the first grounding point G1 and the second grounding point G2 and the second border 302 connection.
  • the phase of the differential signal fed by the first feed point F 1 in FIG. 6 leads the phase of the differential signal fed by the second feed point F 2 by 180° as an example:
  • NFC control module 40 via a first differential signal feeding point F 1 fed into the first resonance circuit 50, through the first feeding point F 1 is fed into a second differential signal via capacitor 503,
  • the first inductor 501 and the metal frame 30 between the first inductor 501 and the first ground point G1 flow into the first ground point G1.
  • the first feeding point F 1 is fed into a differential signal begins with a first ground point G1 to the second ground point G2, then
  • the metal frame 30 between the second ground point G2 and the first inductor 601, the first inductor 601 and the second capacitor 603 flow into the second feed point F 2 , and are fed into the NFC control module by the second feed point F 2 40. Therefore, in one phase period, the differential signal fed by the first feed point F 1 is a loop throughout the phase period, which can increase the circulation area, that is, increase the magnetic flux, thereby improving the performance of the NFC.
  • the phase opposite to a direction indicated by a second loop 6 feeding point F 2 fed into a differential signal and the first feed point F is formed. 1 and FIG signal direction .
  • FIG. 7 the frame 302 in FIG. 7 is spaced, and when G1 and G2 are used, there should be an interval
  • FIG. 6 the first resonant circuit 50 and the second resonant circuit 60 are located between the first grounding point G1 and the second grounding point G2, and the first grounding point G1 and the second grounding point G2 and the second frame 302 are connection.
  • the paths of the differential signals in FIG. 7 and FIG. 6 are the same, and the details are not described herein again.
  • the difference between FIG. 8 and FIG. 6 is that the second ground point G2 is located in the metal frame 30 in FIG. 8 , but the second ground point G2 and the second frame 302 may not have a connection relationship.
  • the two ground points G2 are connected to the first inductor 601 (for example, connected by a coil).
  • the paths of the differential signals in FIG. 8 and FIG. 6 are the same, and the details are not described herein again.
  • the first grounding point G1 may also be located between the first resonant circuit 50 and the second resonant circuit 60, and the second resonant circuit 60 may also be located between the first ground point G1 and the second ground point G2.
  • the first grounding point G1 may also be located between the first resonant circuit 50 and the second resonant circuit 60
  • the second resonant circuit 60 may also be located between the first ground point G1 and the second ground point G2.
  • the grounding point G includes a grounding point as an example.
  • both the first resonant circuit 50 and the second resonant circuit 60 are connected to the ground point G, and the ground point G is connected to the second frame 302. That is, the first resonance circuit 50 and the second resonance circuit 60 share the ground point G.
  • the grounding point G may be disposed on the second bezel 302 in the present application, and the grounding point G is equal to the distance between the first resonant circuit and the second resonant circuit.
  • the grounding point G may include a first grounding point G1 and a second grounding point G2, and the first grounding point G1 and the first The two grounding points G2 are located on both sides of the second interval, wherein the first grounding point G1 is connected to the first resonant circuit 50, and the second grounding point G2 is connected to the second resonant circuit 60.
  • the second interval C between the first resonant circuit 50 and the second resonant circuit 50, that is, the second interval separates the first resonant circuit 50 from the second resonant circuit 50.
  • the first grounding point G1 is located between the first resonant circuit 50 and the second resonant circuit 60
  • the second resonant circuit 60 is located between the first grounding point G1 and the second grounding point G2.
  • a phase shifting unit 70 for converting the second feed point F 2 into the differential signal of the second resonant circuit 60 may be disposed between the second feed point F 2 and the second capacitor 603
  • the phase of the differential signal is such that the phase of the differential signal fed into the second resonant circuit 60 by the second feed point F 2 is the same as the phase of the differential signal fed to the first resonant circuit 50 by the first feed point F 1 .
  • phase shifting unit 70 can be a phase shifter.
  • phase shifter For example, Barron.
  • the arrow ( ⁇ ) in FIG. 9 shows the direction of the differential signal output by the NFC control module 40.
  • the differential signal output by the NFC control module 40 is input to the second resonant circuit 60 through the second feed point F 2 , and sequentially passes through the second capacitor 603 , the first inductor 601 , and the second in the second resonant circuit 60 .
  • the first grounding point G1 and the second grounding point G2 can be used to split the differential signal output by the NFC control module 40, thereby achieving double resonance, and due to the first feeding point F 1 and the second feeding point.
  • the phases between F 2 are the same. Therefore, the NFC communication bandwidth is increased in the two reflows, so that the magnetic flux of the NFC system is increased.
  • FIG. 10 differs from FIG. 9 in that the first ground point G1 and the second ground point G2 are located between the first resonance circuit 50 and the second resonance circuit 60 in FIG.
  • the differential signal output from the NFC control module 40 through a first feeding point F 1 fed into the first resonance circuit 50, and sequentially the second capacitor 503 via the first resonance circuit 50, a first The inductor 501 and the metal frame located between the first ground point G1 and the first inductor 501 flow to the first ground point G1.
  • the first feeding point F 1 fed to the first resonant circuit 50 via the differential signals flow from the first ground point G1 to a second Grounding point G2, and flowing through the metal frame between the second grounding point G2 and the first inductor 601, the second capacitor 603 and then the second feeding point F 2 to the NFC control module 40 to form a loop, thereby increasing
  • the current area of the differential signal output by the NFC control module is such that the magnetic flux is increased.
  • FIG. 11 differs from FIG. 9 in that the first resonance circuit 50 and the second resonance circuit 60 are located between the first ground point G1 and the second ground point G2 in FIG.
  • the differential signal output by the NFC control module 40 in FIG. 11 is fed into the first resonant circuit 50 through the first feed point F 1 , and sequentially passes through the second capacitor 503 in the first resonant circuit 50 , the first inductor 501 , and The metal frame located between the first grounding point G1 and the first inductor 501 flows to the first grounding point G1.
  • the differential signal fed by the first feed point F 1 flows to the second ground point G2 via the first ground point G1 and the PCB board, and passes through the metal frame between the second ground point G2 and the first inductor 601, and the first inductor 601 And the third capacitor 603 is input to the second feed point F 2 to form a loop.
  • the access point in the application is connected to the second frame by a metal block or a locking screw, and the first end of the first inductor 501 and the first end of the first inductor 601 are connected by a metal block or a locking screw. Connected to the second border.
  • a PCB board for example, a Flexible Printed Circuit Board (FPC) is provided.
  • the PCB board can be used for arranging components.
  • the first in the embodiment of the present application The various components included in the resonant circuit 50 and the second resonant circuit 60, the first grounding point, the second grounding point, and the like.
  • the matching circuit of the first feeding point F 1 (that is, the matching circuit corresponding to F1 in the NFC antenna) is first adjusted, and the resonance point of the first resonant circuit is slightly higher than the actual requirement.
  • the carrier frequency specified by the protocol is 13.56 MHz
  • the second resonant circuit 60 is slightly lower than 13.56 MHz by adjusting the matching circuit corresponding to the second feeding point F 2 (that is, the matching circuit corresponding to F2 in the NFC antenna).
  • the first resonant circuit 50 and the second resonant circuit 60 are close to each other to increase the bandwidth.
  • the specific debugging result is shown in FIG. The line labeled 1 in FIG.
  • the line labeled 2 is the debugging result of the NFC antenna structure shown in FIG. 2
  • the line labeled 3 is the embodiment of the present application. Debug results of the near field antenna system provided.
  • FIG. 13 is a schematic diagram showing a comparison between the NFC near-field antenna system provided in the embodiment of the present application and the card-sending result in the terminal device, which is compared with the prior art 1 and the prior art 2.
  • the line labeled 4 is the result of applying the NFC near field antenna system provided in the embodiment of the present application to the card in the terminal device.
  • the line labeled 5 provides the NFC antenna structure provided by the prior art 2 for the card swipe result in the terminal device.
  • the line labeled 6 provides the NFC antenna structure provided in the prior art 1 for the card swipe result in the terminal device. Comparing the three lines in FIG. 13 , it can be determined that the NFC near field antenna system provided by the embodiment of the present application is significantly improved in the area of the card swiping in the terminal device, so the scheme has certain feasibility for improving the swipe area.
  • Table 1 shows the area comparison of the prior art one, the prior art two and the near field communication antenna system coil provided by the present application:
  • the embodiment of the present application further provides a terminal device, where the terminal device has the above-mentioned metal frame, and the metal frame is used as the outer peripheral portion of the terminal device, and the metal frame has at least two intervals on different sides, and the terminal device further includes: A near field communication antenna system provided by an embodiment of the present invention; in the terminal device, a near field communication antenna system is used in a terminal device to transmit a signal and receive a signal.
  • the battery back cover of the terminal device may be a non-metal back cover or a metal back cover, which is not limited in this application. As long as the battery back cover portion and the metal frame portion are separated by a gap, they may not be integrated.

Abstract

The present application relates to the technical field of terminals, and provides a near field communication (NFC) antenna system and a terminal device, for use in increasing the magnetic flux of an NFC antenna. The NFC antenna system is applied in a terminal device, and the terminal device comprises a metal bezel. The solution comprises: an NFC control module disposed in the metal bezel, a first resonant circuit connected to a first feed point of the NFC control module, a second resonant circuit connected to a second feed point of the NFC control module, and a ground point disposed in the metal bezel. The NFC control module is used for generating a differential signal. The first feed point is used for feeding the differential signal to the first resonant circuit. The first resonant circuit is further connected to the ground point to output the differential signal fed by the first feed point to the ground point. The second resonant circuit is further connected to the ground point to feed the differential signal, input from the ground point to the second resonant circuit, to the NFC control module by means of the second feed point.

Description

一种近场通信天线***和终端设备Near field communication antenna system and terminal equipment 技术领域Technical field
本申请涉及终端技术领域，尤其涉及一种近场通信天线***和终端设备。The present application relates to the field of terminal technologies, and in particular, to a near field communication antenna system and a terminal device.
背景技术Background technique
目前随着终端设备(例如，手机、平板电脑)的快速发展，越来越多的终端设备支持近距离无线通信(near field communication，NFC)功能。NFC功能采用了双向的识别和连接，支持NFC功能的终端设备(下述将支持NFC功能的终端设备简称为：NFC终端设备)具有三种功能模式：NFC终端设备作为识读设备(读卡器模式)、NFC终端设备作为被读设备(卡模拟，即可以作为***、公交卡等集成电路卡(integrated circuit card，IC)用)、NFC终端设备之间的点对点(即多个终端设备之间数据交互，类似于蓝牙)通信应用。所以开启NFC功能后，终端设备将面临很多IC卡和销售终端(point of sale，POS)机，由于不同IC卡和POS机之间的谐振点差异，造成终端设备要有一定的兼容性。With the rapid development of terminal devices (for example, mobile phones and tablets), more and more terminal devices support near field communication (NFC) functions. The NFC function adopts two-way identification and connection. The NFC-enabled terminal device (hereinafter referred to as NFC-enabled terminal device is abbreviated as: NFC terminal device) has three functional modes: NFC terminal device as the reading device (reader) Mode), NFC terminal device as a device to be read (card emulation, that can be used as an integrated circuit card (IC) for credit cards, bus cards, etc.), point-to-point between NFC terminal devices (ie, between multiple terminal devices) Data interaction, similar to Bluetooth) communication applications. Therefore, after the NFC function is enabled, the terminal device will face many IC cards and point of sale (POS) machines. Due to the difference in resonance points between different IC cards and POS machines, the terminal devices must have certain compatibility.
传统技术方案中，如图1所示，图1示出了传统技术方案中NFC天线结构，包括：设置于终端设备的金属边框20内的柔性电路板(flexible printed circuit，FPC)和位于FPC上的线圈10。这样当NFC终端设备启动NFC功能后，通过NFC天线结构辐射出电波信号，和POS机的天线进行信号传递，完成通信。In the conventional technical solution, as shown in FIG. 1 , FIG. 1 shows an NFC antenna structure in a conventional technical solution, including: a flexible printed circuit (FPC) disposed in a metal frame 20 of the terminal device and located on the FPC. Coil 10. In this way, when the NFC terminal device starts the NFC function, the radio wave signal is radiated through the NFC antenna structure, and the signal is transmitted to the antenna of the POS machine to complete the communication.
此外，传统技术方案中还可以使用终端设备的金属边框实现NFC天线结构。例如，如图2所示，在终端设备顶部的金属边框20上设置馈电点(Feed，F)和接地点(Ground，G)，并使用F点和G点之间的金属边框201代替如图1所示的线圈，以构成NFC天线。In addition, in the conventional technical solution, the NFC antenna structure can also be implemented by using the metal frame of the terminal device. For example, as shown in FIG. 2, a feed point (Feed, F) and a ground point (Ground, G) are set on the metal frame 20 at the top of the terminal device, and the metal frame 201 between the F point and the G point is used instead. The coil shown in Figure 1 is constructed to form an NFC antenna.
但是，如图1所示的NFC天线结构，由于线圈10的面积较大，将占用终端设备内部很大的空间，增加成本。且线圈10的电感值，相对于金属边框20的电感值较大，不在一个量级上，而线圈10的电阻和金属边框20的电阻都比较小，一般在一个量级上，所以线圈10的Q值就比较大，因此NFC天线带宽窄些。在终端设备使用金属后壳的情况下，由于金属后壳可以屏蔽部分天线信号，因此会使得NFC天线性能很差。此外，图2中使用金属边框201代替线圈，在实际使用时还常会因为与POS机器不兼容。However, the NFC antenna structure shown in FIG. 1 has a large space inside the terminal device due to the large area of the coil 10, which increases the cost. Moreover, the inductance value of the coil 10 is larger than the inductance value of the metal frame 20, and is not on the order of magnitude, and the resistance of the coil 10 and the resistance of the metal frame 20 are relatively small, generally on an order of magnitude, so the coil 10 is The Q value is relatively large, so the bandwidth of the NFC antenna is narrower. In the case where the terminal device uses a metal back shell, since the metal back shell can shield part of the antenna signal, the performance of the NFC antenna is poor. In addition, the metal frame 201 is used in place of the coil in FIG. 2, which is often incompatible with the POS machine in actual use.
发明内容Summary of the invention
本申请实施例提供一种近场通信天线***和终端设备，用以增加NFC天线的磁通量。The embodiment of the present application provides a near field communication antenna system and a terminal device for increasing the magnetic flux of the NFC antenna.
本申请实施例的第一方面，提供一种近场通信天线***，应用于终端设备中，终端设备包括金属边框，所述天线***包括：设置在金属边框内的近距离无线通信NFC控制模块，与所述NFC控制模块相连的第一谐振电路以及第二谐振电路，以及设置于所述金属边框内的接地点；所述金属边框上具有位于不同侧的至少两个间隔；其中，NFC控制模块用于产生差分信号；所述第一谐振电路，还与所述接地点相连，用于将 所述NFC控制模块输出的差分信号输出至所述接地点；所述第二谐振电路，还与所述接地点相连，用于将经所述接地点输入至所述第二谐振电路的差分信号馈入所述NFC控制模块中。A first aspect of the present application provides a near field communication antenna system, which is applied to a terminal device, where the terminal device includes a metal frame, and the antenna system includes: a short-range wireless communication NFC control module disposed in the metal frame. a first resonant circuit and a second resonant circuit connected to the NFC control module, and a grounding point disposed in the metal frame; the metal frame has at least two intervals on different sides; wherein, the NFC control module For generating a differential signal; the first resonant circuit is further connected to the ground point for outputting a differential signal output by the NFC control module to the ground point; the second resonant circuit is further The grounding point is connected to feed a differential signal input to the second resonant circuit via the grounding point into the NFC control module.
具体的，NFC控制模块上包括第一馈入点和第二馈入点，其中，第一馈入点用于将差分信号馈入第一谐振电路中，第二馈入点用于将经所述接地点输入至第二谐振电路的差分信号通过第二馈入点馈入NFC控制模块中，或者将差分信号馈入第二谐振电路中。Specifically, the NFC control module includes a first feed point and a second feed point, wherein the first feed point is used to feed the differential signal into the first resonant circuit, and the second feed point is used to The differential signal input to the second resonant circuit at the ground point is fed into the NFC control module through the second feed point, or the differential signal is fed into the second resonant circuit.
相应的，第一谐振电路，用于将所述第一馈入点馈入的差分信号输出至所述接地点；第二谐振电路，还与接地点相连，用于将经所述接地点输入至第二谐振电路的差分信号通过第二馈入点馈入NFC控制模块中。Correspondingly, a first resonant circuit is configured to output a differential signal fed by the first feed point to the ground point; and a second resonant circuit is further connected to the ground point for inputting the ground point The differential signal to the second resonant circuit is fed into the NFC control module through the second feed point.
本申请提供一种近场通信天线***，通过在金属边框内设置接地点，以利用设置在金属边框内的第一谐振电路和第二谐振电路与接地点和金属边框之间形成一个环路，这样NFC控制模块输出的差分信号便可以沿着环路形成回流，从而增大了差分信号的环流面积，增加了磁通量，从而提升NFC的性能。此外，本申请提供的天线***和其他天线共用同一结构的自由度更高，同时，减少对其他天线的实现和调试的影响。The present application provides a near field communication antenna system, by providing a ground point in a metal frame to form a loop between the first resonant circuit and the second resonant circuit disposed in the metal frame and the ground point and the metal frame. In this way, the differential signal output by the NFC control module can form a reflow along the loop, thereby increasing the circulating area of the differential signal and increasing the magnetic flux, thereby improving the performance of the NFC. In addition, the antenna system provided by the present application and the other antennas share the same structure with higher degree of freedom, and at the same time, reduce the influence on the implementation and debugging of other antennas.
结合第一方面，在第一方面的第一种可能的实现方式中，金属边框为由第一边框和位于所述第一边框上方的第二边框围合成具有至少两个间隔的框体，所述第一谐振电路和第二谐振电路相同，所述第一谐振电路包括：第一电感、第一电容和第二电容，其中，所述第一电感的第一端与所述第二边框连接，所述第一电感的第二端与所述第一电容的第一端以及第二电容的第一端连接，所述第一电容的第二端接地，所述第二电容的第二端与所述NFC控制模块的第一馈入点连接。With reference to the first aspect, in a first possible implementation manner of the first aspect, the metal frame is configured by the first frame and the second frame located above the first frame to form a frame having at least two intervals. The first resonant circuit is the same as the second resonant circuit, the first resonant circuit includes: a first inductor, a first capacitor, and a second capacitor, wherein the first end of the first inductor is connected to the second frame The second end of the first inductor is connected to the first end of the first capacitor and the first end of the second capacitor, the second end of the first capacitor is grounded, and the second end of the second capacitor Connected to a first feed point of the NFC control module.
结合第一方面或第一方面的第一种可能的实现方式中，在第一方面的第二种可能的实现方式中，接地点包括第一接地点和第二接地点，其中，所述第一接地点与所述第一谐振电路相连，所述第二接地点与所述第二谐振电路相连，所述第一接地点位于所述第一谐振电路和所述第二谐振电路之间，且所述第二谐振电路位于所述第一接地点和所述第二接地点之间，所述第一接地点和所述第二接地点与所述金属边框相连。In combination with the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the ground point includes a first ground point and a second ground point, where the a grounding point is connected to the first resonant circuit, the second grounding point is connected to the second resonant circuit, and the first grounding point is located between the first resonant circuit and the second resonant circuit, And the second resonant circuit is located between the first ground point and the second ground point, and the first ground point and the second ground point are connected to the metal frame.
结合第一方面至第一方面的第二种可能的实现方式中任一项，在第一方面的第三种可能的实现方式中，第二谐振电路与所述NFC控制模块之间设置有移相单元，所述第二馈入点还用于将所述差分信号馈入所述第二谐振电路中，所述移相单元用于转换所述第二馈入点馈入至所述第二谐振电路中的差分信号的相位，以使得所述第二馈入点馈入至所述第二谐振电路中的差分信号的相位与所述第一馈入点至所述第一谐振电路中的差分信号的相位相同。With reference to any one of the first aspect to the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the second resonant circuit and the NFC control module are disposed with a shift a phase unit, the second feed point is further configured to feed the differential signal into the second resonant circuit, and the phase shifting unit is configured to convert the second feed point to the second a phase of the differential signal in the resonant circuit such that a phase of the differential signal fed to the second feed point into the second resonant circuit and the first feed point to the first resonant circuit The phases of the differential signals are the same.
结合第一方面至第一方面的第三种可能的实现方式中任一项，在第一方面的第四种可能的实现方式中，接地点包括第一接地点和第二节地点，其中，所述第一接地点与所述第一谐振电路相连，所述第二接地点与所述第二谐振电路相连，在所述第一接地点和所述第二接地点与所述金属边框相连，或者所述第一接地点与所述金属边框相连的情况下，所述第一接地点和所述第二接地点位于所述第一谐振电路和所述第二谐振电路之间。With reference to any one of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the grounding point includes a first ground point and a second node location, where The first grounding point is connected to the first resonant circuit, the second grounding point is connected to the second resonant circuit, and the first grounding point and the second grounding point are connected to the metal frame Or, in a case where the first grounding point is connected to the metal frame, the first grounding point and the second grounding point are located between the first resonant circuit and the second resonant circuit.
结合第一方面至第一方面的第四种可能的实现方式中任一项，在第一方面的第五 种可能的实现方式中，第一谐振电路和所述第二谐振电路位于所述第一接地点和所述第二接地点之间，所述第一接地点和所述第二接地点与所述金属边框相连。With reference to any one of the first aspect to the fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the first resonant circuit and the second resonant circuit are located in the Between a grounding point and the second grounding point, the first grounding point and the second grounding point are connected to the metal frame.
结合第一方面至第一方面的第五种可能的实现方式中任一项，在第一方面的第六种可能的实现方式中，接入点通过金属块接弹片或锁螺钉与第二边框连接。With reference to any one of the first aspect to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the access point is connected to the second frame by a metal block or a lock screw connection.
本申请实施例的第二方面，提供一种终端设备，终端设备包括金属边框，所述金属边框上具有位于不同侧的至少两个间隔，所述终端设备还包括：如上述第一方面至第一方面的任一种可能的实现方式所描述的近场通信天线***；近场通信天线***在所述终端设备中用于发射信号和接收信号。A second aspect of the present application provides a terminal device, where the terminal device includes a metal frame, and the metal frame has at least two intervals on different sides, and the terminal device further includes: A near field communication antenna system as described in any of the possible implementations of the aspect; a near field communication antenna system is used in the terminal device for transmitting signals and receiving signals.
附图说明DRAWINGS
图1为现有技术中提供的一种NFC天线结构的示意图；1 is a schematic diagram of an NFC antenna structure provided in the prior art;
图2为现有技术中提供的另一种NFC天线结构的示意图；2 is a schematic diagram of another NFC antenna structure provided in the prior art;
图3为本申请实施例提供的一种载波调制的示意图；FIG. 3 is a schematic diagram of carrier modulation according to an embodiment of the present disclosure;
图4为本申请实施例提供的一种近场通信天线***的结构示意图一；4 is a schematic structural diagram 1 of a near field communication antenna system according to an embodiment of the present application;
图5为本申请实施例提供的一种近场通信天线***的结构示意图二；FIG. 5 is a schematic structural diagram 2 of a near field communication antenna system according to an embodiment of the present disclosure;
图6为本申请实施例提供的一种近场通信天线***的结构示意图三；FIG. 6 is a schematic structural diagram 3 of a near field communication antenna system according to an embodiment of the present disclosure;
图7为本申请实施例提供的一种近场通信天线***的结构示意图四；FIG. 7 is a schematic structural diagram 4 of a near field communication antenna system according to an embodiment of the present disclosure;
图8为本申请实施例提供的一种近场通信天线***的结构示意图五；FIG. 8 is a schematic structural diagram 5 of a near field communication antenna system according to an embodiment of the present disclosure;
图9为本申请实施例提供的一种近场通信天线***的结构示意图六；FIG. 9 is a schematic structural diagram 6 of a near field communication antenna system according to an embodiment of the present disclosure;
图10为本申请实施例提供的一种近场通信天线***的结构示意图七；FIG. 10 is a schematic structural diagram 7 of a near field communication antenna system according to an embodiment of the present disclosure;
图11为本申请实施例提供的一种近场通信天线***的结构示意图八；FIG. 11 is a schematic structural diagram 8 of a near field communication antenna system according to an embodiment of the present disclosure;
图12为本申请实施例提供的对比示意图一；Figure 12 is a schematic diagram 1 of the comparison provided by the embodiment of the present application;
图13为本申请实施例提供的对比示意图二。FIG. 13 is a schematic diagram 2 of a comparison provided by an embodiment of the present application.
具体实施方式detailed description
在介绍本发明实施例提供的一种近场通信天线***之前，首先介绍本发明实施例的原理：Before introducing a near field communication antenna system provided by an embodiment of the present invention, the principle of the embodiment of the present invention is first introduced:
设调制信号频率为ω 0，载波频率为ω c，副载波频率为ω sub。根据傅里叶变换频移特性即调制定理，
Figure PCTCN2018084283-appb-000001
Let the frequency of the modulation signal be ω 0 , the carrier frequency be ω c , and the subcarrier frequency be ω sub . According to the Fourier transform frequency shift characteristic, the modulation theorem,
Figure PCTCN2018084283-appb-000001
傅里叶变换频移特性：若F(jω)＝F[f(t)]，则
Figure PCTCN2018084283-appb-000002
Figure PCTCN2018084283-appb-000003
Fourier transform frequency shift characteristics: If F(jω)=F[f(t)], then
Figure PCTCN2018084283-appb-000002
Figure PCTCN2018084283-appb-000003
对于NFC通信中的调制过程如图3所示：首先基带信号先对副载波ω sub进行调制，调制后的调制波，再次作为基带信号去调制载波信号ω c。 The modulation process in NFC communication is as shown in FIG. 3: First, the baseband signal first modulates the subcarrier ω sub , and the modulated modulated wave again modulates the carrier signal ω c as a baseband signal.
图3中，ω 0为调制信号频率，ω c为载波信号频率，ω sub为副载波频率，在NFC领域，不同的标准(例如，ISO14443 A、ISO14443B及ISO15693)规定载波信号ω c工作频率都是13.56MHz，都采用副载波调制技术。在调制过程中，不同的副载波调制时可以存在频率偏差(例如，允许的频率偏差为-7KHz～+7KHz)。但是，不同标准所用的副载波频率不同，ISO14443 A与ISO14443 B，采用的副载波频率为847.5KHz，ISO15693采用的副载波频率为423KHz，ISO14443 A所需的比特率为106Kbit/s、ISO14443B所需的比特率212Kbit/s及ISO15693所需的比特率为424Kbit/s。所以终 端设备兼容上述标准需要满足一定的带宽要求。以基带信号的比特率为106Kbit/s为例，规定频率是13.56MHz，又因为采用了副载波技术，所以载波分别是12.71MHz(13.56MHz～847.5KHz)及14.4MHz。所以NFC天线处于正常工作状态时，NFC天线的带宽(Band Width，BW)需要包括两个副载波的带宽。例如，NFC天线所需带宽为：2×(847.5+106+7)KHz＝1.92MHz。当速率为424Kbit/s时，BW＝2×(847.5+424+7)KHz＝2.557MHz，也即是终端设备需要兼容到最大带宽。基于此，本申请从天线原理上是利用NFC天线通信中差分信号特点，在NFC天线中引入接地，增加回流路径，以产生至少两个回流，从而产生双谐振来增加带宽，另外使两个回流同相，这样同时也增加了磁通量，从而提高性能。 In Fig. 3, ω 0 is the modulation signal frequency, ω c is the carrier signal frequency, and ω sub is the subcarrier frequency. In the NFC field, different standards (for example, ISO14443 A, ISO14443B, and ISO15693) specify the carrier signal ω c operating frequency. It is 13.56MHz and uses subcarrier modulation technology. In the modulation process, there may be frequency deviations when different subcarriers are modulated (for example, the allowed frequency deviation is -7 kHz to +7 kHz). However, the subcarrier frequencies used by different standards are different. ISO14443 A and ISO14443 B use a subcarrier frequency of 847.5 kHz, ISO15693 uses a subcarrier frequency of 423 kHz, and ISO14443 A requires a bit rate of 106 Kbit/s and ISO 14443B. The bit rate required for the bit rate of 212 Kbit/s and ISO 15693 is 424 Kbit/s. Therefore, the terminal equipment is compatible with the above standards and needs to meet certain bandwidth requirements. Taking the bit rate of the baseband signal as 106 Kbit/s as an example, the specified frequency is 13.56 MHz, and because the subcarrier technology is adopted, the carriers are 12.71 MHz (13.56 MHz to 847.5 KHz) and 14.4 MHz, respectively. Therefore, when the NFC antenna is in normal working state, the bandwidth (Band Width, BW) of the NFC antenna needs to include the bandwidth of two subcarriers. For example, the required bandwidth of the NFC antenna is: 2 x (847.5 + 106 + 7) KHz = 1.92 MHz. When the rate is 424 Kbit/s, BW = 2 × (847.5 + 424 + 7) KHz = 2.557 MHz, that is, the terminal device needs to be compatible with the maximum bandwidth. Based on this, the application from the antenna principle utilizes the differential signal characteristics in NFC antenna communication, introduces ground in the NFC antenna, increases the return path to generate at least two reflows, thereby generating double resonance to increase the bandwidth, and additionally making two reflows. In phase, this also increases the magnetic flux, which improves performance.
如图4所示，图4示出了本申请提供的一种近场通信天线***，应用于终端设备中，该终端设备具有金属边框30，该天线***包括：设置在金属边框30内的近距离无线通信NFC控制模块(也可以称为NFC芯片)40，与NFC控制模块40的第一馈入点F 1相连的第一谐振电路50，与NFC控制模块40的第二馈入点F 2相连的第二谐振电路60，以及设置于金属边框30内的接地点G；金属边框30上具有位于不同侧的至少两个间隔(例如，图4中所示的间隔A和间隔B)。其中，NFC控制模块40用于产生差分信号，第一馈入点F 1用于将差分信号馈入第一谐振电路50中，第一谐振电路50，还与接地点G相连，用于将第一馈入点F 1馈入的差分信号输出至接地点G。第二谐振电路60，还与接地点G相连，用于将接地点G输入的差分信号通过第二馈入点F 2馈入至NFC控制模块40中以形成环路。 As shown in FIG. 4, FIG. 4 illustrates a near field communication antenna system provided by the present application, which is applied to a terminal device having a metal frame 30, and the antenna system includes: a metal frame 30 disposed in the vicinity of the metal frame 30. The distance wireless communication NFC control module (also referred to as NFC chip) 40, the first resonant circuit 50 connected to the first feed point F 1 of the NFC control module 40, and the second feed point F 2 of the NFC control module 40 A second resonant circuit 60 is connected, and a ground point G disposed within the metal frame 30; the metal frame 30 has at least two intervals on different sides (eg, interval A and interval B shown in FIG. 4). The NFC control module 40 is configured to generate a differential signal, and the first feed point F 1 is used to feed the differential signal into the first resonant circuit 50. The first resonant circuit 50 is further connected to the ground point G for The differential signal fed by a feed point F 1 is output to the ground point G. The second resonant circuit 60 is also connected to the ground point G for feeding the differential signal input from the ground point G into the NFC control module 40 through the second feed point F 2 to form a loop.
本申请中的第一馈入点F 1既可以将NFC控制模块40输出的差分信号馈入至第一谐振电路50中，也可以将接地点G输入的差分信号馈入至NFC控制模块40中。 The first feed point F 1 in the present application can feed the differential signal output by the NFC control module 40 into the first resonant circuit 50, or can feed the differential signal input from the ground point G into the NFC control module 40. .
第二馈入点F 2既可以将NFC控制模块40输出的差分信号馈入至第二谐振电路60中，也可以将接地点G输入的差分信号馈入至NFC控制模块40中。具体的，第一馈入点F 1和第二馈入点F 2是向NFC控制模块40中输入差分信号，还是将差分信号从NFC控制模块40中输出，下述将结合具体实施例介绍，此处不再赘述。 The second feed point F 2 can feed the differential signal output by the NFC control module 40 into the second resonant circuit 60, or can feed the differential signal input from the ground point G into the NFC control module 40. Specifically, the first feed point F 1 and the second feed point F 2 are to input a differential signal to the NFC control module 40 or to output the differential signal from the NFC control module 40. The following description will be introduced in conjunction with a specific embodiment. I will not repeat them here.
可以理解的是，本申请中的第一馈入点F 1和第二馈入点F 2可以为NFC控制模块40本身具有的馈入点，也可以为以其他方式(例如，焊接的形式)固定在NFC控制模块40上的两个馈入点，本申请对此不作限定。只要第一馈入点F 1可以保证NFC控制模块的信号接入到第一谐振电路50，第二馈入点F 2可以保证NFC控制模块40的信号接入到第二谐振电路60中即可。 It can be understood that the first feeding point F 1 and the second feeding point F 2 in the present application may be feeding points of the NFC control module 40 itself, or may be in other manners (for example, welding). The two feed points fixed on the NFC control module 40 are not limited in this application. As long as the first feed point F 1 can ensure that the signal of the NFC control module is connected to the first resonant circuit 50, the second feed point F 2 can ensure that the signal of the NFC control module 40 is connected to the second resonant circuit 60. .
示例性的，第一馈入点F 1和第二馈入点F 2可以为金属弹脚(片)或顶针，本申请对此不作限定。 Illustratively, the first feed point F 1 and the second feed point F 2 may be metal feet (sheets) or thimbles, which are not limited in this application.
示例性的，本申请中的终端设备可以为手机，平板电脑或者POS机器。Exemplarily, the terminal device in this application may be a mobile phone, a tablet computer or a POS device.
可选的，本申请中的NFC控制模块40用于提供差分信号。本申请中对NFC控制模块40的具体结构不作限定。Optionally, the NFC control module 40 in the present application is configured to provide a differential signal. The specific structure of the NFC control module 40 is not limited in the present application.
可以理解的是，本申请中的金属边框内设置有NFC天线。具体的，NFC控制模块40设置于NFC天线内，NFC控制模块40产生差分信号，流向NFC天线。例如，NFC天线(还可以接收信号，处理信号及完成最终的数据交易)可以包括：近场通讯芯片(例如，NFC芯片)以及***电路。例如，***电路可以为滤波电路和天线匹配电路， 所述近场通讯芯片和滤波电路连接，所述滤波电路和天线匹配电路连接，所述天线匹配电路与第一馈入点和第二馈入点连接。It can be understood that an NFC antenna is disposed in the metal frame in the present application. Specifically, the NFC control module 40 is disposed in the NFC antenna, and the NFC control module 40 generates a differential signal to the NFC antenna. For example, an NFC antenna (which can also receive signals, process signals, and complete final data transactions) can include near field communication chips (eg, NFC chips) and peripheral circuits. For example, the peripheral circuit may be a filter circuit and an antenna matching circuit, the near field communication chip and the filter circuit are connected, the filter circuit is connected with an antenna matching circuit, and the antenna matching circuit is connected to the first feed point and the second feed point. Point connection.
本申请提供一种近场通信天线***，通过在金属边框内设置接地点，以利用设置在金属边框内的第一谐振电路和第二谐振电路与接地点和金属边框之间形成一个环路，这样NFC控制模块输出的差分信号便可以沿着环路形成回流，从而增大了差分信号的环流面积，增加了磁通量，从而提升NFC的性能。此外，本申请提供的天线***和其他天线共用同一结构的自由度更高，同时，减少对其他天线的实现和调试的影响。The present application provides a near field communication antenna system, by providing a ground point in a metal frame to form a loop between the first resonant circuit and the second resonant circuit disposed in the metal frame and the ground point and the metal frame. In this way, the differential signal output by the NFC control module can form a reflow along the loop, thereby increasing the circulating area of the differential signal and increasing the magnetic flux, thereby improving the performance of the NFC. In addition, the antenna system provided by the present application and the other antennas share the same structure with higher degree of freedom, and at the same time, reduce the influence on the implementation and debugging of other antennas.
示例性的，如图4所示，本申请中的金属边框30为由第一边框301和位于第一边框301上方的第二边框302围合成具有至少两个间隔的框体。For example, as shown in FIG. 4 , the metal frame 30 in the present application is surrounded by a first frame 301 and a second frame 302 located above the first frame 301 to form a frame having at least two intervals.
本申请中对第一边框301和第二边框302的具体结构不作限定。如图4所示，例如，第一边框301可以包括两个平行设置的第一垂直边框、第一水平边框，其中，两个平行设置的第一垂直边框与第一水平边框垂直，且两个平行设置的第一垂直边框与第一水平边框连接。当然，本申请中两个平行设置的第一垂直边框中任一个第一垂直边框均可以包括第一部分和第二部分，其中第一部分和第二部分之间具有间隔，第二部分与第一水平边框连接。The specific structure of the first frame 301 and the second frame 302 is not limited in the present application. As shown in FIG. 4 , for example, the first frame 301 may include two first vertical frames and a first horizontal frame disposed in parallel, wherein two parallel first vertical frames are perpendicular to the first horizontal frame, and two The first vertical borders arranged in parallel are connected to the first horizontal border. Of course, any one of the two first vertical frames disposed in parallel in the present application may include a first portion and a second portion, wherein the first portion and the second portion have a space therebetween, and the second portion is at a first level The border is connected.
作为一种示例，第二边框302包括：两个平行设置的第二垂直边框，以及第二水平边框，其中，两个平行设置的第二垂直边框与第二水平边框垂直，且两个平行设置的第二垂直边框与第二水平边框连接。As an example, the second frame 302 includes: two second vertical frames disposed in parallel, and a second horizontal frame, wherein the two parallel vertical frames are perpendicular to the second horizontal frame, and two parallel frames are disposed. The second vertical border is connected to the second horizontal border.
需要说明的是，本申请中近场通信天线***还可以包括除第一谐振电路50和第二谐振电路60之外的其余谐振电路，该其余谐振电路的具体结构可以参见第一谐振电路50和第二谐振电路60，本申请在此不再追的。应当理解的是，当近场通信天线***内包括其余谐振电路时，NFC控制模块中还具有第三馈入点，用于向其余谐振电路输入差分信号。It should be noted that the near field communication antenna system in the present application may further include other resonant circuits than the first resonant circuit 50 and the second resonant circuit 60. For the specific structure of the remaining resonant circuits, refer to the first resonant circuit 50 and The second resonant circuit 60 is not pursued herein. It should be understood that when the remaining resonant circuit is included in the near field communication antenna system, the NFC control module also has a third feed point for inputting a differential signal to the remaining resonant circuits.
本申请中的第一谐振电路50和第二谐振电路60的结构相同，下述实施例以第一谐振电路为例详细介绍第一谐振电路50和第二谐振电路60的具体结构。The first resonant circuit 50 and the second resonant circuit 60 in the present application have the same structure. The following embodiment details the specific structure of the first resonant circuit 50 and the second resonant circuit 60 by taking the first resonant circuit as an example.
如图5所示，本申请中的第一谐振电路50包括：第一电感501、第一电容502和第二电容503，其中，第一电感501的第一端与第二边框302连接，第一电感501的第二端与第一电容502的第一端以及第二电容503的第一端连接，第一电容502的第二端接地，第二电容503的第二端与NFC控制模块的第一馈入点F 1连接。第二谐振电路60包括：第一电感601、第一电容602和第二电容603，其中，第一电感601的第一端与第二边框302连接，第一电感601的第二端与第一电容602的第一端以及第二电容603的第一端连接，第一电容602的第二端接地，第二电容603的第二端与NFC控制模块的第二馈入点F 2连接。 As shown in FIG. 5, the first resonant circuit 50 of the present application includes a first inductor 501, a first capacitor 502, and a second capacitor 503, wherein the first end of the first inductor 501 is connected to the second frame 302, The second end of the first capacitor 502 is connected to the first end of the first capacitor 502, the second end of the second capacitor 503 is grounded, and the second end of the second capacitor 503 is connected to the NFC control module. The first feed point F 1 is connected. The second resonant circuit 60 includes a first inductor 601, a first capacitor 602, and a second capacitor 603. The first end of the first inductor 601 is connected to the second frame 302, and the second end of the first inductor 601 is first. The first end of the capacitor 602 is connected to the first end of the second capacitor 603, the second end of the first capacitor 602 is grounded, and the second end of the second capacitor 603 is connected to the second feed point F 2 of the NFC control module.
可以理解的是，第一电感501、第一电容502和第二电容503、第一电感601、第一电容602和第二电容603均是用来调整谐振点。第一接地点G1、第二接地点G2表示第二边框302到设置在金属边框内的PCB板的下地点，也是NFC控制模块的下地点。It can be understood that the first inductor 501, the first capacitor 502 and the second capacitor 503, the first inductor 601, the first capacitor 602 and the second capacitor 603 are all used to adjust the resonance point. The first grounding point G1 and the second grounding point G2 represent the second frame 302 to the lower location of the PCB board disposed in the metal frame, and are also the lower points of the NFC control module.
本申请中的接地点可以为一个接地点，也可以为一组接地点，该一组接地点可以包括两个或两个以上的接地点。由于第一谐振电路和第二谐振电路之间是否具有间隔， 会使得接地点的数量以及位置发生变化，因此下述将结合具体实施例介绍：The grounding point in this application may be a grounding point or a group of grounding points, which may include two or more grounding points. Since there is a gap between the first resonant circuit and the second resonant circuit, the number and position of the grounding points are changed, so the following will be described in conjunction with the specific embodiments:
可以理解的是，本申请中当第一馈入点和第二馈入点均用于输出NFC控制模块40输出的差分信号时，第一馈入点F 1和本申请中第一馈入点F 1馈入的差分信号的相位与第二馈入点F 2馈入的差分信号之间存在相位差。示例性的，本申请中以两者之间的相位差为180°为例。 It can be understood that, when the first feed point and the second feed point are both used to output the differential signal output by the NFC control module 40, the first feed point F 1 and the first feed point in the present application. There is a phase difference between the phase of the differential signal fed by F 1 and the differential signal fed by the second feed point F 2 . Illustratively, in the present application, the phase difference between the two is 180° as an example.
下述图6-图8将以第一谐振电路和第二谐振电路之间不存在间隔，接地点G可以包括第一接地点G1和第二接地点G2为例，其中，第一接地点G1与第一谐振电路50连接，第二接地点G2与第二谐振电路60连接。(注：如果第二边框302中间没有间隔(或者说中间是断开的)就只用一个G的，如果有间隔，需要用到G1和G2的)。6 to 8 will have an interval between the first resonant circuit and the second resonant circuit, and the grounding point G may include a first grounding point G1 and a second grounding point G2, wherein the first grounding point G1 Connected to the first resonant circuit 50, the second ground point G2 is coupled to the second resonant circuit 60. (Note: If there is no gap in the middle of the second border 302 (or the middle is broken), only one G is used. If there is an interval, G1 and G2 are needed).
如图6所示，该第一接地点G1和第二接地点G2可以位于第一谐振电路50和第二谐振电路60之间，且第一接地点G1和第二接地点G2与第二边框302连接。图6中以第一馈入点F 1馈入的差分信号的相位超前第二馈入点F 2馈入的差分信号的相位180°为例： As shown in FIG. 6, the first grounding point G1 and the second grounding point G2 may be located between the first resonant circuit 50 and the second resonant circuit 60, and the first grounding point G1 and the second grounding point G2 and the second border 302 connection. The phase of the differential signal fed by the first feed point F 1 in FIG. 6 leads the phase of the differential signal fed by the second feed point F 2 by 180° as an example:
由图6可以知道，NFC控制模块40的差分信号经第一馈入点F 1馈入至第一谐振电路50中，经第一馈入点F 1馈入的差分信号经第二电容503、第一电感501以及位于第一电感501和第一接地点G1之间的金属边框30流入第一接地点G1。由于第一接地点G1和第二接地点G2与第二边框302连接，因此，经第一馈入点F 1馈入的差分信号便从第一接地点G1流向第二接地点G2，然后通过第二接地点G2和第一电感601之间的金属边框30，第一电感601以及第二电容603流向第二馈入点F 2中，并由第二馈入点F 2馈入NFC控制模块40中。因此，在一个相位周期内，第一馈入点F 1馈入的差分信号在整个相位周期内为一个环路，可以增大环流面积，即是增加了磁通量，从而提升NFC的性能。在第二馈入点F 2的相位周期内，由第二馈入点F 2馈入的差分信号和第一馈入点F 1形成的环路的信号方向与图6所示的相位方向相反。 Can be known from FIG. 6, NFC control module 40 via a first differential signal feeding point F 1 fed into the first resonance circuit 50, through the first feeding point F 1 is fed into a second differential signal via capacitor 503, The first inductor 501 and the metal frame 30 between the first inductor 501 and the first ground point G1 flow into the first ground point G1. Since the first ground point G1 and the second ground point G2 302 is connected to the second frame, and therefore, the first feeding point F 1 is fed into a differential signal begins with a first ground point G1 to the second ground point G2, then The metal frame 30 between the second ground point G2 and the first inductor 601, the first inductor 601 and the second capacitor 603 flow into the second feed point F 2 , and are fed into the NFC control module by the second feed point F 2 40. Therefore, in one phase period, the differential signal fed by the first feed point F 1 is a loop throughout the phase period, which can increase the circulation area, that is, increase the magnetic flux, thereby improving the performance of the NFC. In the second feed point F of the phase cycle 2, the phase opposite to a direction indicated by a second loop 6 feeding point F 2 fed into a differential signal and the first feed point F is formed. 1 and FIG signal direction .
如图7所示，图7(图7中边框302是有间隔的，用到G1和G2时，都应该有间隔)示出了本申请中另一种接地点的位置关系示意图，与图6相比，在图7中第一谐振电路50和第二谐振电路60位于第一接地点G1和第二接地点G2之间，且第一接地点G1和第二接地点G2与第二边框302连接。图7与图6中差分信号的路径相同，本申请在此不再赘述。As shown in FIG. 7, FIG. 7 (the frame 302 in FIG. 7 is spaced, and when G1 and G2 are used, there should be an interval), the positional relationship diagram of another grounding point in the present application is shown, and FIG. 6 In comparison, in FIG. 7, the first resonant circuit 50 and the second resonant circuit 60 are located between the first grounding point G1 and the second grounding point G2, and the first grounding point G1 and the second grounding point G2 and the second frame 302 are connection. The paths of the differential signals in FIG. 7 and FIG. 6 are the same, and the details are not described herein again.
如图8所示，图8与图6的区别在于，在图8中第二接地点G2位于金属边框30内，但是第二接地点G2与第二边框302之间可以不具有连接关系，第二接地点G2与第一电感601连接(例如，通过线圈连接)。图8与图6中差分信号的路径相同，本申请在此不再赘述。As shown in FIG. 8 , the difference between FIG. 8 and FIG. 6 is that the second ground point G2 is located in the metal frame 30 in FIG. 8 , but the second ground point G2 and the second frame 302 may not have a connection relationship. The two ground points G2 are connected to the first inductor 601 (for example, connected by a coil). The paths of the differential signals in FIG. 8 and FIG. 6 are the same, and the details are not described herein again.
需要说明的是，当第一谐振电路50和第二谐振电路60之间不存在间隔时，第一接地点G1还可以位于第一谐振电路50和第二谐振电路60之间，第二谐振电路60还可以位于第一接地点G1和第二接地点G2之间。具体的，差分信号的路径可以参考上述图6-图8中，本申请在此不再赘述。It should be noted that when there is no gap between the first resonant circuit 50 and the second resonant circuit 60, the first grounding point G1 may also be located between the first resonant circuit 50 and the second resonant circuit 60, and the second resonant circuit 60 may also be located between the first ground point G1 and the second ground point G2. For details, refer to the foregoing FIG. 6-8 in the path of the differential signal, which is not described herein again.
请继续结合图5，图5中将以第一谐振电路50和第二谐振电路60之间不存在间隔，接地点G包括一个接地点为例。如图5所示，也即第一谐振电路50和第二谐振电路60均与接地点G连接，且接地点G与第二边框302连接。即第一谐振电路50和 第二谐振电路60共用接地点G。为了构造一个大的环流，提高磁通量，本申请中可以将接地点G设置在第二边框302上，且使得接地点G到第一谐振电路和第二谐振电路之间的距离相等。Please continue to refer to FIG. 5. In FIG. 5, there will be no interval between the first resonant circuit 50 and the second resonant circuit 60, and the grounding point G includes a grounding point as an example. As shown in FIG. 5, that is, both the first resonant circuit 50 and the second resonant circuit 60 are connected to the ground point G, and the ground point G is connected to the second frame 302. That is, the first resonance circuit 50 and the second resonance circuit 60 share the ground point G. In order to construct a large circulating current and increase the magnetic flux, the grounding point G may be disposed on the second bezel 302 in the present application, and the grounding point G is equal to the distance between the first resonant circuit and the second resonant circuit.
下述图9-图11将以第一谐振电路和第二谐振电路之间存在第二间隔，接地点G可以包括第一接地点G1和第二接地点G2，且第一接地点G1和第二接地点G2位于第二间隔两侧为例，其中，第一接地点G1与第一谐振电路50连接，第二接地点G2与第二谐振电路60连接。9 to 11 will have a second interval between the first resonant circuit and the second resonant circuit, and the grounding point G may include a first grounding point G1 and a second grounding point G2, and the first grounding point G1 and the first The two grounding points G2 are located on both sides of the second interval, wherein the first grounding point G1 is connected to the first resonant circuit 50, and the second grounding point G2 is connected to the second resonant circuit 60.
如图9所示，第一谐振电路50和第二谐振电路50之间存在第二间隔C，也即第二间隔将第一谐振电路50和第二谐振电路50隔开。第一接地点G1位于第一谐振电路50和第二谐振电路60之间，且第二谐振电路60位于第一接地点G1和第二接地点G2之间。为了使得第一馈入点F 1馈入至第一谐振电路50中差分信号和第二馈入点F 2馈入至第二谐振电路60中差分信号的电流大小不相互削弱，本申请中，可以在第二馈入点F 2和第二电容603之间设置移相单元70，该移相单元70用于将第二馈入点F 2转换馈入至第二谐振电路60中差分信号的差分信号的相位，以使得第二馈入点F 2转换馈入至第二谐振电路60中差分信号的相位与第一馈入点F 1馈入至第一谐振电路50中差分信号的相位相同。 As shown in FIG. 9, there is a second interval C between the first resonant circuit 50 and the second resonant circuit 50, that is, the second interval separates the first resonant circuit 50 from the second resonant circuit 50. The first grounding point G1 is located between the first resonant circuit 50 and the second resonant circuit 60, and the second resonant circuit 60 is located between the first grounding point G1 and the second grounding point G2. In order to make the first feeding point F 1 fed to the first resonant circuit 50 and the second differential signal feeding point F 2 fed to the magnitude of the current difference signal 60 in the second resonant circuit does not weaken each other, the present application, A phase shifting unit 70 for converting the second feed point F 2 into the differential signal of the second resonant circuit 60 may be disposed between the second feed point F 2 and the second capacitor 603 The phase of the differential signal is such that the phase of the differential signal fed into the second resonant circuit 60 by the second feed point F 2 is the same as the phase of the differential signal fed to the first resonant circuit 50 by the first feed point F 1 .
示例性的，移相单元70可以为移相位器。例如，巴伦。Illustratively, the phase shifting unit 70 can be a phase shifter. For example, Barron.
图9中的箭头(→)示出了NFC控制模块40输出的差分信号的方向。由图9可以看出，NFC控制模块40输出的差分信号通过第一馈入点F 1馈入至第一谐振电路50中，并依次经第一谐振电路50中的第二电容503、第一电感501以及位于第一接地点G1和第一电感501之间的金属边框流向第一接地点G1，以形成第一回流。同理，NFC控制模块40输出的差分信号通过第二馈入点F 2输入至第二谐振电路60中，并依次经第二谐振电路60中的第二电容603、第一电感601以及位于第二接地点G2和第一电感601之间的金属边框流向第二接地点G2，以形成第二回流。这样利用第一接地点G1和第二接地点G2便可以实现对NFC控制模块40输出的差分信号进行分流的目的，从而实现双谐振，且由于第一馈入点F 1和第二馈入点F 2之间相位相同。因此，使得两个回流中的而增加NFC通信带宽，使得NFC***的磁通量增加。 The arrow (→) in FIG. 9 shows the direction of the differential signal output by the NFC control module 40. As we can be seen from Figure 9, the differential signal output from the NFC control module 40 through a first feeding point F 1 fed into the first resonance circuit 50, and sequentially the second capacitor 503 via the first resonance circuit 50, a first The inductor 501 and the metal frame between the first ground point G1 and the first inductor 501 flow to the first ground point G1 to form a first reflow. Similarly, the differential signal output by the NFC control module 40 is input to the second resonant circuit 60 through the second feed point F 2 , and sequentially passes through the second capacitor 603 , the first inductor 601 , and the second in the second resonant circuit 60 . The metal frame between the two grounding points G2 and the first inductor 601 flows to the second grounding point G2 to form a second reflow. Thus, the first grounding point G1 and the second grounding point G2 can be used to split the differential signal output by the NFC control module 40, thereby achieving double resonance, and due to the first feeding point F 1 and the second feeding point. The phases between F 2 are the same. Therefore, the NFC communication bandwidth is increased in the two reflows, so that the magnetic flux of the NFC system is increased.
如图10所示，图10与图9的区别在于，在图10中第一接地点G1和第二接地点G2位于第一谐振电路50和第二谐振电路60之间。由图10可以看出，NFC控制模块40输出的差分信号通过第一馈入点F 1馈入至第一谐振电路50中，并依次经第一谐振电路50中的第二电容503、第一电感501以及位于第一接地点G1和第一电感501之间的金属边框流向第一接地点G1。由于第一接地点G1和第二接地点G2位于PCB板或者FPC上，因此，从第一馈入点F 1馈入至第一谐振电路50中差分信号经第一接地点G1流向至第二接地点G2，并经由第二接地点G2与第一电感601之间的金属边框、第二电容603之后通过第二馈入点F 2流向NFC控制模块40中，以形成环路，从而增大了NFC控制模块输出的差分信号的电流面积，以使得磁通量增加。 As shown in FIG. 10, FIG. 10 differs from FIG. 9 in that the first ground point G1 and the second ground point G2 are located between the first resonance circuit 50 and the second resonance circuit 60 in FIG. As it can be seen from FIG. 10, the differential signal output from the NFC control module 40 through a first feeding point F 1 fed into the first resonance circuit 50, and sequentially the second capacitor 503 via the first resonance circuit 50, a first The inductor 501 and the metal frame located between the first ground point G1 and the first inductor 501 flow to the first ground point G1. Since the first ground point G1 and ground point G2 located on the second PCB board or an FPC, thus, the first feeding point F 1 fed to the first resonant circuit 50 via the differential signals flow from the first ground point G1 to a second Grounding point G2, and flowing through the metal frame between the second grounding point G2 and the first inductor 601, the second capacitor 603 and then the second feeding point F 2 to the NFC control module 40 to form a loop, thereby increasing The current area of the differential signal output by the NFC control module is such that the magnetic flux is increased.
如图11所示，图11与图9的区别在于，在图11中第一谐振电路50和第二谐振电路60位于第一接地点G1和第二接地点G2之间。在图11中NFC控制模块40输出的差分信号通过第一馈入点F 1馈入至第一谐振电路50中，并依次经第一谐振电路50 中的第二电容503、第一电感501以及位于第一接地点G1和第一电感501之间的金属边框流向第一接地点G1。第一馈入点F 1馈入的差分信号经第一接地点G1以及PCB板流向第二接地点G2，并经过第二接地点G2与第一电感601之间的金属边框、第一电感601以及第三电容603输入至第二馈入点F 2中以形成环路。 As shown in FIG. 11, FIG. 11 differs from FIG. 9 in that the first resonance circuit 50 and the second resonance circuit 60 are located between the first ground point G1 and the second ground point G2 in FIG. The differential signal output by the NFC control module 40 in FIG. 11 is fed into the first resonant circuit 50 through the first feed point F 1 , and sequentially passes through the second capacitor 503 in the first resonant circuit 50 , the first inductor 501 , and The metal frame located between the first grounding point G1 and the first inductor 501 flows to the first grounding point G1. The differential signal fed by the first feed point F 1 flows to the second ground point G2 via the first ground point G1 and the PCB board, and passes through the metal frame between the second ground point G2 and the first inductor 601, and the first inductor 601 And the third capacitor 603 is input to the second feed point F 2 to form a loop.
可选的，本申请中的接入点通过金属块接弹片或锁螺钉与第二边框连接，第一电感501的第一端以及第一电感601的第一端通过金属块接弹片或锁螺钉与第二边框连接。Optionally, the access point in the application is connected to the second frame by a metal block or a locking screw, and the first end of the first inductor 501 and the first end of the first inductor 601 are connected by a metal block or a locking screw. Connected to the second border.
需要说明的是，本申请中的容纳空间中设置有PCB板(例如，柔性线路板(Flexible Printed Circuit Board，FPC)。该PCB板可用于布置元器件。例如，本申请实施例中的第一谐振电路50和第二谐振电路60所包括的各种元器件，第一接地点以及第二接地点等。It should be noted that, in the accommodating space in the present application, a PCB board (for example, a Flexible Printed Circuit Board (FPC) is provided. The PCB board can be used for arranging components. For example, the first in the embodiment of the present application. The various components included in the resonant circuit 50 and the second resonant circuit 60, the first grounding point, the second grounding point, and the like.
结合图9，本发明实施例中先通过调整第一馈入点F 1上的匹配电路(也即NFC天线中与F1对应的匹配电路)，将第一谐振电路的谐振点稍高于实际要求协议规定的载波频率13.56MHz，再通过调整第二馈入点F 2对应的匹配电路(也即NFC天线中与F2对应的匹配电路)，将第二谐振电路60稍低于13.56MHz，这样将第一谐振电路50和第二谐振电路60靠近，增加带宽，具体调试结果如图12所示。在图12中标识为1的线条为图1所示的NFC天线结构的调试结果，标识为2的线条为图2所示的NFC天线结构的调试结果，标识为3的线条为本申请实施例提供的近场天线***的调试结果。 Referring to FIG. 9, in the embodiment of the present invention, the matching circuit of the first feeding point F 1 (that is, the matching circuit corresponding to F1 in the NFC antenna) is first adjusted, and the resonance point of the first resonant circuit is slightly higher than the actual requirement. The carrier frequency specified by the protocol is 13.56 MHz, and the second resonant circuit 60 is slightly lower than 13.56 MHz by adjusting the matching circuit corresponding to the second feeding point F 2 (that is, the matching circuit corresponding to F2 in the NFC antenna). The first resonant circuit 50 and the second resonant circuit 60 are close to each other to increase the bandwidth. The specific debugging result is shown in FIG. The line labeled 1 in FIG. 12 is the debugging result of the NFC antenna structure shown in FIG. 1 , the line labeled 2 is the debugging result of the NFC antenna structure shown in FIG. 2 , and the line labeled 3 is the embodiment of the present application. Debug results of the near field antenna system provided.
由图10可知，本申请实施例中将第一谐振电路50和第二谐振电路60融合在一起，增加带宽效果明显，可以完全覆盖上述实施例计算的带宽。由于设置有第一谐振电路50和第二谐振电路60，因此可以包含两个副载波调制信号。结合图13可知，图13示出了本申请实施例提供的NFC近场天线***应用于终端设备中刷卡结果与现有技术一和现有技术二的对比示意图。在图13中，标识为4的线条为本申请实施例提供的NFC近场天线***应用于终端设备中刷卡结果。标识为5的线条为现有技术二提供的NFC天线结构应用于终端设备中刷卡结果。标识为6的线条为现有技术一提供的NFC天线结构应用于终端设备中刷卡结果。对比图13中的三个线条，可以确定本申请实施例提供的NFC近场天线***应用于终端设备中刷卡面积改善明显，所以对于提升刷卡面积该方案具有一定的可行性。表1示出了现有技术一、现有技术二以及本申请提供的近场通信天线***线圈的面积对比：It can be seen from FIG. 10 that the first resonant circuit 50 and the second resonant circuit 60 are fused together in the embodiment of the present application, and the effect of increasing the bandwidth is obvious, and the bandwidth calculated by the above embodiment can be completely covered. Since the first resonance circuit 50 and the second resonance circuit 60 are provided, two subcarrier modulation signals can be included. As shown in FIG. 13 , FIG. 13 is a schematic diagram showing a comparison between the NFC near-field antenna system provided in the embodiment of the present application and the card-sending result in the terminal device, which is compared with the prior art 1 and the prior art 2. In FIG. 13, the line labeled 4 is the result of applying the NFC near field antenna system provided in the embodiment of the present application to the card in the terminal device. The line labeled 5 provides the NFC antenna structure provided by the prior art 2 for the card swipe result in the terminal device. The line labeled 6 provides the NFC antenna structure provided in the prior art 1 for the card swipe result in the terminal device. Comparing the three lines in FIG. 13 , it can be determined that the NFC near field antenna system provided by the embodiment of the present application is significantly improved in the area of the card swiping in the terminal device, so the scheme has certain feasibility for improving the swipe area. Table 1 shows the area comparison of the prior art one, the prior art two and the near field communication antenna system coil provided by the present application:
表1不同天线***的线圈的面积Table 1 Areas of coils of different antenna systems
Figure PCTCN2018084283-appb-000004
Figure PCTCN2018084283-appb-000004
本申请实施例还提供一种终端设备，该终端设备具有上述金属边框，金属边框用作所述终端设备的外周部，该金属边框具有至少两个位于不同侧的间隔，该终端设备还包括：本发明实施例提供的近场通信天线***；在所述终端设备中，近场通信天线***在终端设备中用于发射信号和接收信号。The embodiment of the present application further provides a terminal device, where the terminal device has the above-mentioned metal frame, and the metal frame is used as the outer peripheral portion of the terminal device, and the metal frame has at least two intervals on different sides, and the terminal device further includes: A near field communication antenna system provided by an embodiment of the present invention; in the terminal device, a near field communication antenna system is used in a terminal device to transmit a signal and receive a signal.
可选的，该终端设备的电池后盖可以为非金属后盖，也可以为金属后盖的边框，本申请对此不作限定。只要电池后盖部分和金属边框部分有缝隙隔开，不是连为一体的就可以实施。Optionally, the battery back cover of the terminal device may be a non-metal back cover or a metal back cover, which is not limited in this application. As long as the battery back cover portion and the metal frame portion are separated by a gap, they may not be integrated.
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims (8)

  1. 一种近场通信天线***，其特征在于，应用于终端设备中，所述终端设备包括金属边框，所述天线***包括：设置在金属边框内的近距离无线通信NFC控制模块，与所述NFC控制模块相连的第一谐振电路以及第二谐振电路，以及设置于所述金属边框内的接地点；所述金属边框上具有位于不同侧的至少两个间隔；A near field communication antenna system is characterized in that it is applied to a terminal device, the terminal device includes a metal frame, and the antenna system includes: a short-range wireless communication NFC control module disposed in the metal frame, and the NFC a first resonant circuit and a second resonant circuit connected to the control module, and a grounding point disposed in the metal frame; the metal frame having at least two intervals on different sides;
    其中，所述NFC控制模块用于产生差分信号；Wherein the NFC control module is configured to generate a differential signal;
    所述第一谐振电路，还与所述接地点相连，用于将所述NFC控制模块输出的差分信号输出至所述接地点；The first resonant circuit is further connected to the grounding point for outputting a differential signal output by the NFC control module to the grounding point;
    所述第二谐振电路，还与所述接地点相连，用于将经所述接地点输入至所述第二谐振电路的差分信号馈入所述NFC控制模块中。The second resonant circuit is further connected to the grounding point for feeding a differential signal input to the second resonant circuit via the grounding point into the NFC control module.
  2. 根据权利要求1所述的天线***，其特征在于，所述金属边框为由第一边框和位于所述第一边框上方的第二边框围合成具有至少两个间隔的框体，所述第一谐振电路和第二谐振电路相同，所述第一谐振电路包括：第一电感、第一电容和第二电容，其中，所述第一电感的第一端与所述第二边框连接，所述第一电感的第二端与所述第一电容的第一端以及第二电容的第一端连接，所述第一电容的第二端接地，所述第二电容的第二端与所述NFC控制模块连接。The antenna system according to claim 1, wherein the metal frame comprises a frame having at least two intervals by a first frame and a second frame above the first frame, the first The resonant circuit is the same as the second resonant circuit, the first resonant circuit includes: a first inductor, a first capacitor, and a second capacitor, wherein the first end of the first inductor is connected to the second frame, a second end of the first inductor is coupled to the first end of the first capacitor and a first end of the second capacitor, the second end of the first capacitor is grounded, and the second end of the second capacitor is The NFC control module is connected.
  3. 根据权利要求1或2所述的天线***，其特征在于，所述接地点包括第一接地点和第二接地点，其中，所述第一接地点与所述第一谐振电路相连，所述第二接地点与所述第二谐振电路相连，所述第一接地点位于所述第一谐振电路和所述第二谐振电路之间，且所述第二谐振电路位于所述第一接地点和所述第二接地点之间，所述第一接地点和所述第二接地点与所述金属边框相连。The antenna system according to claim 1 or 2, wherein the grounding point comprises a first grounding point and a second grounding point, wherein the first grounding point is connected to the first resonant circuit, a second grounding point is connected to the second resonant circuit, the first grounding point is between the first resonant circuit and the second resonant circuit, and the second resonant circuit is located at the first grounding point The first grounding point and the second grounding point are connected to the metal frame between the second grounding point and the second grounding point.
  4. 根据权利要求3所述的天线***，其特征在于，所述第二谐振电路与所述NFC控制模块之间设置有移相单元，所述NFC控制模块还用于将所述差分信号馈入所述第二谐振电路中，The antenna system according to claim 3, wherein a phase shifting unit is disposed between the second resonant circuit and the NFC control module, and the NFC control module is further configured to feed the differential signal into the In the second resonant circuit,
    所述移相单元用于转换所述NFC控制模块馈入至所述第二谐振电路中的差分信号的相位，以使得所述NFC控制模块馈入至所述第二谐振电路中的差分信号的相位与所述NFC控制模块馈入至所述第一谐振电路中的差分信号的相位相同。The phase shifting unit is configured to convert a phase of the differential signal fed by the NFC control module into the second resonant circuit, so that the NFC control module feeds the differential signal into the second resonant circuit The phase is the same as the phase of the differential signal fed into the first resonant circuit by the NFC control module.
  5. 根据权利要求1或2所述的天线***，其特征在于，所述接地点包括第一接地点和第二节地点，其中，所述第一接地点与所述第一谐振电路相连，所述第二接地点与所述第二谐振电路相连，在所述第一接地点和所述第二接地点与所述金属边框相连，或者所述第一接地点与所述金属边框相连的情况下，所述第一接地点和所述第二接地点位于所述第一谐振电路和所述第二谐振电路之间。The antenna system according to claim 1 or 2, wherein the grounding point comprises a first grounding point and a second node point, wherein the first grounding point is connected to the first resonant circuit, a second grounding point is connected to the second resonant circuit, and the first grounding point and the second grounding point are connected to the metal frame, or the first grounding point is connected to the metal frame The first ground point and the second ground point are located between the first resonant circuit and the second resonant circuit.
  6. 根据权利要求1或2所述的天线***，其特征在于，所述第一谐振电路和所述第二谐振电路位于所述第一接地点和所述第二接地点之间，所述第一接地点和所述第二接地点与所述金属边框相连。The antenna system according to claim 1 or 2, wherein said first resonance circuit and said second resonance circuit are located between said first ground point and said second ground point, said first A ground point and the second ground point are connected to the metal frame.
  7. 根据权利要求3-6任一项所述的天线***，其特征在于，所述接入点通过金属块接弹片或锁螺钉与第二边框连接。The antenna system according to any one of claims 3-6, wherein the access point is connected to the second frame by a metal block connecting elastic piece or a locking screw.
  8. 一种终端设备，其特征在于，所述终端设备包括金属边框，所述金属边框上包括位于不同侧的至少两个间隔，所述终端设备还包括：如权利要求1至7中任一项所 述的近场通信天线***；A terminal device, comprising: a metal frame, the metal frame comprising at least two intervals on different sides, the terminal device further comprising: according to any one of claims 1 to Near field communication antenna system;
    所述近场通信天线***在所述终端设备中用于发射信号和接收信号。The near field communication antenna system is used in the terminal device to transmit signals and receive signals.
PCT/CN2018/084283 2018-04-24 2018-04-24 Near field communication antenna system and terminal device WO2019204988A1 (en)

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