WO2013159429A1 - Module de communication nfc - Google Patents

Module de communication nfc Download PDF

Info

Publication number
WO2013159429A1
WO2013159429A1 PCT/CN2012/076714 CN2012076714W WO2013159429A1 WO 2013159429 A1 WO2013159429 A1 WO 2013159429A1 CN 2012076714 W CN2012076714 W CN 2012076714W WO 2013159429 A1 WO2013159429 A1 WO 2013159429A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication module
nfc
nfc communication
antenna
circuit
Prior art date
Application number
PCT/CN2012/076714
Other languages
English (en)
Chinese (zh)
Inventor
高志强
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2013159429A1 publication Critical patent/WO2013159429A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • 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

Definitions

  • the utility model relates to the field of communication, in particular to an NFC communication module. Background technique
  • NFC English full name Near Field Communication that is, short-range wireless communication. It is a wireless technology initiated by Philips and jointly promoted by famous manufacturers such as Nokia and Sony. NFC works in the 13.6MHz band and has evolved from RFID (Radio Frequency IDentification) technology. With a single chip, NFC technology enables inductive readers, inductive cards, and point-to-point communication. Like RFID, NFC information is also transmitted by electromagnetic induction coupling of the radio frequency portion of the spectrum, but there is still a big difference between the two.
  • NFC is a wireless connection technology that provides easy, secure and fast communication. Its transmission range is smaller than that of RFID. The transmission range of RFID can reach several meters or even tens of meters, but because NFC adopts unique signal attenuation technology, Compared with RFID, NFC has the characteristics of close distance, high bandwidth and low energy consumption.
  • NFC technology has a lower operating frequency band, it requires a larger area of the antenna, and the conventional antenna has a rusting effect when the antenna is working due to a piece of metal underneath, which seriously affects the working efficiency of the antenna. Therefore, in general, it is necessary to increase the number of antenna coil turns or to attach a ferrite material to the antenna coil. These methods not only increase the area of the antenna, but also increase the cost of the antenna.
  • the main object of the present invention is to provide an NFC communication module having a smaller antenna area and a lower manufacturing cost.
  • the present invention provides an NFC communication module, including: an NFC circuit with an antenna contact, and a speaker with a coil, the access point of the coil is connected to an antenna contact of the NFC circuit .
  • the NFC communication module further includes: an audio circuit; the audio circuit is connected to the coil through the access point.
  • the NFC communication module further includes: a first switch; an antenna contact of the NFC circuit is connected to the access point through the first switch.
  • the NFC communication module further includes a second switch;
  • the audio circuit is coupled to the access point via the second switch.
  • the NFC communication module further includes: a high pass filter; the antenna contact is connected to the access point through a high pass filter.
  • the NFC communication module further includes a low pass filter; the audio circuit is connected to the access point through a low pass filter.
  • the speaker further includes a ferrite sheet.
  • the NFC communication module further includes a frequency selection circuit
  • the antenna contact and the audio circuit are connected to the access point through the frequency selection circuit.
  • the frequency selection circuit includes a first filter connected to the antenna contact and a second filter connected to the audio circuit, and the pass signal frequency band of the first filter is higher than the second The pass signal band of the filter.
  • the first filter is a high pass filter
  • the second filter is a low pass filter
  • the utility model provides an NFC communication module, which comprises an NFC circuit with an antenna contact and a speaker with a coil, the access point of the coil is connected with the antenna contact of the NFC circuit, and thus, by using the speaker coil at the same time
  • the NFC antenna can make the NFC communication module have a smaller antenna area, and it is not necessary to separately set the antenna (coil) to have a low manufacturing cost.
  • the frequency selection circuit is used to avoid signal interference.
  • FIG. 1 is a schematic diagram of a conventional NFC antenna applied to a mobile phone
  • FIG. 2 is a schematic structural view of a speaker
  • FIG. 3 is a schematic diagram of a circuit design scheme of an embodiment of the present invention. Detailed ways
  • the NFC communication module is mounted on the back cover of the mobile phone.
  • the NFC antenna 12 occupies a large area of the mobile phone structure 11, and the cost of the coil and the ferrite is high.
  • the more commonly used speaker structure through the position 21 of the coil and the position 22 of the magnet, can be seen that the distance between the coil and the magnet is much larger than the distance between the conventional NFC antenna coil and the ferrite. Conducive to the coupling of energy between the induction fields, effectively utilizing the vertical space, improving the efficiency of the antenna.
  • the feed end 23 (feed point, access point) is located outside the outer casing portion 24 of the speaker, this time to facilitate the addition of circuitry.
  • Traditional NFC antennas account for almost half of the handset area, and the speaker NFC antenna is much smaller than the conventional NFC antenna footprint.
  • an NFC communication module of the present invention includes an NFC circuit 3, an antenna contact on the NFC circuit 3, and a speaker 1 with a coil, the coil including the NFC
  • the access point of the circuit 3's antenna contact is connected (the feed end, which belongs to the positive and negative terminals of the coil itself).
  • the speaker coil acts as an NFC antenna.
  • an audio circuit 4 may also be included in implementation, the audio circuit 4 being coupled to the coil through the access point.
  • the NFC circuit 3 is embedded in an existing audio system, which is often the case.
  • the speaker 1 may be implemented with a ferrite sheet (usually having), Ferrite sheets can act to strengthen the magnetic field.
  • the antenna contact of the NFC circuit 3 and the audio circuit 4 can be simultaneously connected to the access point through the frequency selection circuit 2, so that the 13.56 MHz RF signal is only between the NCF circuit 3 and the antenna (speaker). Propagation does not affect the audio circuit 4; likewise, the audio circuit 4 does not affect the NFC circuit 3. This ensures that less than 20k audio signals and 13.56MHz NFC RF signals can be separated without interfering with each other.
  • the frequency selection circuit 2 includes a high pass filter connected to an antenna contact of the NFC circuit 3 and a low pass filter connected to the audio circuit 4.
  • the frequency selection circuit 2 can also be replaced by other existing circuits of the same function.
  • the foregoing is not limited to the low pass filter and the high pass filter, and only the pass signal of the first filter is higher than the second filter.
  • the pass signal band is sufficient, and the demarcation of the pass signal bands of the two filters is between the frequency band of the frequency selection circuit 2 and the NFC circuit 3.
  • the frequency selection circuit 2 can be replaced by one or more of the following options as needed:
  • An antenna contact of the NFC circuit 3 is connected to the access point through a first switch
  • the audio circuit 4 is connected to the access point through a second switch
  • the antenna contacts of the NFC circuit 3 can be connected to the access point via a high pass filter; the audio circuit 4 can be coupled to the access point via a low pass filter.
  • an NFC communication module embodiment includes a speaker 1 with a coil, and a positive input point of the coil is connected to a high-pass filter and a low-pass filter, and the negative pole of the coil is connected.
  • the in-point is also connected to a high-pass filter and a low-pass filter.
  • the antenna contacts of the NFC circuit 3 are connected to two high-pass filters for connection to the access point, and the audio circuit 4 is connected to two low-pass filters. Implement connection to the access point.
  • This patent is designed with a new design of the antenna and the speaker of the mobile phone.
  • the speaker coil of the mobile phone realizes the function of the NFC antenna coil. According to the formula of the magnetic field strength of the coil: _ N*I*ab ill )
  • ⁇ is the magnetic field strength
  • I is the current intensity
  • ⁇ is the number of turns
  • R is the antenna radius
  • X is the action distance.
  • a and b are the sides of a rectangular conductor.
  • the magnetic field strength can be increased by increasing the number of coils N.
  • This design uses the speaker coil to realize the function of the NFC antenna coil, which is to reduce the area by increasing the number of turns.
  • the magnet of the speaker implements a ferrite function.
  • the present invention uses a speaker to implement the NFC antenna function, which can greatly reduce the antenna area and cost.
  • the audio signal of the speaker is up to 20k, and the NFC operates at 13.56MHz.
  • the difference between the two frequencies is large, and it can be separated by the frequency selection network (frequency selection circuit), so there is no mutual interference.
  • the compatible design of the NFC antenna and the mobile phone speaker can be realized by selecting the number of coil turns and the coil area suitable for both work.
  • the NFC antenna and the speaker can be integrated to reduce the occupied area of the NFC antenna and reduce the overall cost of the mobile phone. It is to be understood that the specific implementation of the invention is not limited to the description. For those skilled in the art, a number of simple deductions or substitutions may be made without departing from the spirit of the present invention, and should be considered as belonging to the scope of protection of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Telephone Set Structure (AREA)

Abstract

L'invention porte sur un module de communication NFC qui est appliqué au domaine des communications radiofréquence et comprend un circuit NFC comportant un point de connexion d'antenne et un haut-parleur pourvu d'une bobine. Le point d'accès de la bobine est connecté au point de connexion d'antenne du circuit NFC. La bobine de haut-parleur est simultanément utilisée comme antenne NFC, ce qui permet d'amener le module de communication NFC à avoir une superficie plus petite d'antenne. Il n'est pas nécessaire de placer indépendamment une antenne (bobine), ce qui permet d'avoir de coûts plus bas de fabrication.
PCT/CN2012/076714 2012-04-27 2012-06-11 Module de communication nfc WO2013159429A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201220186640.2 2012-04-27
CN201220186640.2U CN202617115U (zh) 2012-04-27 2012-04-27 一种nfc通讯模块

Publications (1)

Publication Number Publication Date
WO2013159429A1 true WO2013159429A1 (fr) 2013-10-31

Family

ID=47350782

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/076714 WO2013159429A1 (fr) 2012-04-27 2012-06-11 Module de communication nfc

Country Status (2)

Country Link
CN (1) CN202617115U (fr)
WO (1) WO2013159429A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8909162B2 (en) 2012-09-07 2014-12-09 Infineon Technologies Ag System and method for transmitting a radio frequency signal through a speaker coil
US11757490B2 (en) 2018-08-02 2023-09-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V Data transmission from a user terminal to another apparatus

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104009295B (zh) * 2013-02-26 2018-04-24 深圳富泰宏精密工业有限公司 近场通信天线及具有该天线的便携式电子装置
CN105099523B (zh) * 2014-05-15 2019-03-22 中兴通讯股份有限公司 一种近距离通信装置及其工作方法、移动终端
KR101673240B1 (ko) * 2014-11-13 2016-11-07 주식회사 에이치시티엠 모바일 기기용 영구자석 구조물
CN106252836A (zh) * 2016-09-22 2016-12-21 青岛海信移动通信技术股份有限公司 终端及其nfc天线的实现方法
CN111865346A (zh) * 2019-04-26 2020-10-30 北京小米移动软件有限公司 移动终端及控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232124A (zh) * 2008-01-11 2008-07-30 邱小军 一种制作近场通信天线的方法
CN101789764A (zh) * 2010-03-09 2010-07-28 广州市圣大电子有限公司 一种射频功率放大器
CN101861703A (zh) * 2007-11-19 2010-10-13 Nxp股份有限公司 用于无接触通信的收发电路
US20110275316A1 (en) * 2010-05-10 2011-11-10 Nokia Corporation Device to device connection setup using near-field communication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101861703A (zh) * 2007-11-19 2010-10-13 Nxp股份有限公司 用于无接触通信的收发电路
CN101232124A (zh) * 2008-01-11 2008-07-30 邱小军 一种制作近场通信天线的方法
CN101789764A (zh) * 2010-03-09 2010-07-28 广州市圣大电子有限公司 一种射频功率放大器
US20110275316A1 (en) * 2010-05-10 2011-11-10 Nokia Corporation Device to device connection setup using near-field communication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8909162B2 (en) 2012-09-07 2014-12-09 Infineon Technologies Ag System and method for transmitting a radio frequency signal through a speaker coil
US11757490B2 (en) 2018-08-02 2023-09-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V Data transmission from a user terminal to another apparatus

Also Published As

Publication number Publication date
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