WO2016078256A1 - 一种共用nfc天线的移动终端 - Google Patents

一种共用nfc天线的移动终端 Download PDF

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Publication number
WO2016078256A1
WO2016078256A1 PCT/CN2015/073907 CN2015073907W WO2016078256A1 WO 2016078256 A1 WO2016078256 A1 WO 2016078256A1 CN 2015073907 W CN2015073907 W CN 2015073907W WO 2016078256 A1 WO2016078256 A1 WO 2016078256A1
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WIPO (PCT)
Prior art keywords
module
antenna
nfc
mobile terminal
inductor
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PCT/CN2015/073907
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English (en)
French (fr)
Inventor
潘灵建
李晶晶
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惠州Tcl移动通信有限公司
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Publication of WO2016078256A1 publication Critical patent/WO2016078256A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • 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
    • H01Q5/10—Resonant antennas

Definitions

  • the present invention relates to the field of mobile device antenna design, and in particular, to a mobile terminal sharing an NFC antenna.
  • NFC Near Field Communication
  • the existing mobile phone design framework generally includes a baseband chip 50, an NFC module 300, a radio frequency module 500, a GPS/WIFI module 70, and an antenna module.
  • the antenna module specifically includes a main antenna 10, a diversity antenna 20, a GPS/WIFI antenna 30, and an NFC antenna 80. As the functionality increases, more and more antennas need to be added to mobile communication devices such as mobile phones.
  • each antenna on a mobile device requires a certain amount of space and cost.
  • the NFC antenna occupies a large space, and in order to avoid interference, it is also necessary to increase the ferrite which is equivalent to the NFC antenna area and is expensive.
  • an object of the present invention is to provide a mobile terminal sharing an NFC antenna, which aims to solve the problem that an existing NFC antenna needs to be additionally installed in a mobile device, which has high cost, large space occupation, and difficult design. .
  • a mobile terminal sharing an NFC antenna includes:
  • At least one high frequency module At least one high frequency module
  • At least one link module for separating an operating frequency of the NFC module and an operating frequency of the high frequency module
  • At least one antenna module for generating a resonant frequency required for operation of the NFC module and a resonant frequency required for operation of the high frequency module;
  • NFC module and the high frequency module are connected to the antenna module through the link module;
  • the link module includes a first inductor and a first capacitor, and one end of the first capacitor and one end of the first inductor are connected to the antenna module, and the other end of the first capacitor is connected to the high frequency module.
  • the other end of the first inductor is connected to the NFC module;
  • the antenna module includes a second capacitor and at least one antenna branch, each of the antenna branches includes a second inductor; the second inductor is located at an end or a middle of the corresponding antenna branch, and one end of the second inductor Grounding, the other end of the second inductor is grounded through the second capacitor, and the other end of the second inductor is further connected to the link module.
  • the sense of the first inductor is 50 to 120 nh, and the capacitance of the first capacitor is 50 to 120 pf.
  • the antenna branch includes two second inductors; and the two second inductors are respectively located at the ends and the middle of the corresponding antenna branches.
  • the sense of the second inductor is 30 to 120 nh, and the capacitance of the second capacitor is greater than 12 pf.
  • the number of the antenna modules is greater than or equal to the number of the high frequency modules, and the number of the link modules is greater than or equal to the number of the high frequency modules;
  • the mobile terminal further includes:
  • a separator configured to connect one of the plurality of antenna modules to the NFC module when the NFC module is in operation; the NFC module connects each of the link modules through the splitter.
  • the high frequency module is a radio frequency module, a global positioning system module or a wireless fidelity module.
  • the antenna module is a diversity antenna, a global positioning system antenna or a wireless fidelity antenna.
  • the mobile terminal further includes a main antenna, and the radio frequency module is connected to the main antenna through a link module.
  • the mobile terminal further includes a baseband chip, and the baseband chip is respectively connected to the high frequency module and the NFC module.
  • a mobile terminal sharing an NFC antenna includes:
  • At least one high frequency module At least one high frequency module
  • At least one link module for separating an operating frequency of the NFC module and an operating frequency of the high frequency module
  • At least one antenna module for generating a resonant frequency required for operation of the NFC module and a resonant frequency required for operation of the high frequency module;
  • the NFC module and the high frequency module are both connected to the antenna module through the link module.
  • the link module includes a first inductor and a first capacitor, and one end of the first capacitor and one end of the first inductor are connected to the antenna module, the first The other end of the capacitor is connected to the high frequency module, and the other end of the first inductor is connected to the NFC module.
  • the sense of the first inductor is 50 to 120 nh, and the capacitance of the first capacitor is 50 to 120 pf.
  • the antenna module includes a second capacitor and at least one antenna branch, each of the antenna branches includes a second inductor; and the second inductor is located at the corresponding antenna branch. In an end or a middle portion, one end of the second inductor is grounded, the other end of the second inductor is grounded through the second capacitor, and the other end of the second inductor is further connected to the link module.
  • the antenna module includes a second capacitor and at least one antenna branch, each of the antenna branches includes two second inductors; and the second inductors are respectively located in the corresponding antennas At the end and the middle of the branch, one end of the second inductor is grounded, the other end of the second inductor is grounded through the second capacitor, and the other end of the second inductor is further connected to the link module.
  • the sense of the second inductor is 30 to 120 nh, and the capacitance of the second capacitor is greater than 12 pf.
  • the number of the antenna modules is greater than or equal to the number of the high frequency modules, and the number of the link modules is greater than or equal to the number of the high frequency modules;
  • the mobile terminal further includes:
  • a separator configured to connect one of the plurality of antenna modules to the NFC module when the NFC module is in operation; the NFC module connects each of the link modules through the splitter.
  • the high frequency module is a radio frequency module, a global positioning system module or a wireless fidelity module.
  • the antenna module is a diversity antenna, a global positioning system antenna or a wireless fidelity antenna.
  • the mobile terminal further includes a main antenna, and the radio frequency module is connected to the main antenna through a link module.
  • the mobile terminal further includes a baseband chip, and the baseband chip is respectively connected to the high frequency module and the NFC module.
  • the mobile terminal sharing the NFC antenna provided by the present invention connects the NFC module and the corresponding antenna through the link module by adding a link module, so that the NFC signal can be transmitted through the original antenna, and the antenna sharing is realized, and no separate NFC antenna is needed. It effectively reduces the difficulty of design, saves equipment space, reduces equipment cost, and has good application prospects.
  • FIG. 1 is a schematic diagram of a prior art mobile phone antenna design.
  • FIG. 2 is a structural block diagram of a preferred embodiment of a mobile terminal sharing a NFC antenna according to the present invention.
  • FIG. 3 is a circuit diagram of a specific embodiment of an antenna of a mobile terminal sharing an NFC antenna according to the present invention.
  • FIG. 4 is a structural block diagram of another preferred embodiment of a mobile terminal sharing a NFC antenna according to the present invention.
  • FIG. 5 is a structural block diagram of a specific embodiment of a radio frequency module of a mobile terminal sharing an NFC antenna according to the present invention.
  • the invention provides a mobile terminal sharing an NFC antenna.
  • the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
  • a preferred embodiment of a mobile terminal sharing a NFC antenna includes an NFC module 300, at least one high frequency module 400, at least one antenna module 100, and at least one link module 200.
  • the NFC module 300 and the high frequency module 400 are connected to the antenna module 100 through the link module 200, respectively.
  • the antenna module 100 can generate the low frequency resonant frequency (specifically determined by the operating frequency of the NFC module) or the high frequency resonant frequency (corresponding to the operating frequency of the high frequency module), so that the antenna module 100 can simultaneously satisfy the low frequency.
  • the link module 200 can separate the operating frequency of the NFC module and the operating frequency of the high frequency module (for example, the NFC operating frequency is 13.56 MHz, and the RF operating frequency is above 700 Mhz), which functions as a duplex to make the NFC module 300 and high.
  • the frequency module 400 can work simultaneously.
  • the high-frequency module 400 and the NFC module 300 do not affect each other while sharing one antenna, and can work simultaneously, reducing the number of antennas. Therefore, the problem that the cost of separately setting the NFC antenna is high and the design is difficult is effectively solved.
  • the high frequency module 400 may be a module that has a large difference between any working and NFC operating frequency points in the mobile device, and may be more than one or two orders of magnitude, such as a radio frequency module, a global positioning system. Module (GPS) module or Wireless Fidelity (WIFI) module.
  • GPS Global Positioning System
  • WIFI Wireless Fidelity
  • the link module 200 includes a first inductor L1 and a first capacitor C1. One end of the first capacitor C1 and one end of the first inductor L1 are connected to the antenna module 100. The other end of the first capacitor C1 is connected to the radio frequency module 500, and the other end of the first inductor L1 is connected to the NFC module 300.
  • the link module 200 utilizes the characteristics of the high frequency blocking low frequency of the capacitive element and the low frequency blocking high frequency of the inductive element, and can achieve a good technical effect of separating the high frequency and low frequency signals.
  • the function of the first capacitor C1 is mainly to block the signal of the NFC operating frequency, so as to avoid affecting the normal operation of the RF module.
  • the function of the inductor is to block the RF signal and avoid interference with the normal operation of the NFC module, so that the NFC module 300 and the RF module 500 can work simultaneously without affecting each other.
  • the sense value of the first inductor L1 can be set to 50 ⁇ 120nh, and the capacitance of the first capacitor C1 is set to 50 ⁇ 120pf.
  • the capacitance of the first capacitor C1 can be appropriately expanded to 150pf or reduced to 22 ⁇ 33pf.
  • the inductance of the first inductor L1 can be appropriately expanded to 150 nh or reduced to 30 nh.
  • the antenna in the antenna module adopts a loop antenna design, and existing antennas (such as a main antenna, a diversity antenna, and a GPS/WIFI antenna) are adopted. Inverted F antenna design. Therefore, in order to realize that the antenna module 100 needs to meet the requirements of applying the NFC signal and the radio frequency signal at the same time, the improvement can be made at the grounding point of the antenna branch.
  • the antenna module 100 includes a second capacitor C2, one or two antenna branches, and the antenna module includes two antenna branches as an example.
  • the two antenna branches include a low frequency resonant frequency of 700M ⁇ 1GHz.
  • the grounding point A adds a second capacitor C2. Due to the electrical characteristics of the second capacitor C2, it can provide a very low impedance for a frequency above 700 MHz (ie, a radio frequency signal). A very large impedance is formed for the NFC frequency (eg, 13.5 MHz), which forms a barrier to the RF signal from this path to ground and avoids the NFC signal from this path to ground.
  • the capacitance of the second capacitor should be greater than 12 pf. In special cases, it can be expanded to 150pf.
  • each antenna branch includes a second inductor L2; the second inductor L2 is located at the end or middle of the corresponding antenna branch, one end of the second inductor L2 is grounded, and the second inductor L2 is another One end is grounded through the second capacitor C2, and the other end of the second inductor L2 is also connected to the link module 200.
  • a second inductor L2 can be placed at the end or middle of the antenna branch.
  • the function of the second inductor L2 is opposite to the second capacitor C2, and can provide a low impedance for the NFC frequency point, so that the NFC frequency signal can be blocked from the path to the ground, and a high impedance is formed for the frequency above 700 MHz to avoid the 700 MHz or higher. The frequency points from this path to the ground.
  • the inductance of the second inductor L2 is set to 30 ⁇ 120nh to meet the impedance requirement. It should be noted that the second inductor L2 disposed at the grounding point of the antenna can also adjust the magnitude of the inductance according to the actual situation, and play a role of matching the NFC, so that the antenna can generate the resonant frequency required by the NFC module.
  • the second inductor L2 in FIG. 3 is connected to the end of the corresponding antenna branch, and the second inductor L2' is connected to the middle of the corresponding antenna branch.
  • the L2 of the first antenna branch 110 can be selected.
  • the branch road (such as the branch where the grounding point B is located in Fig. 3) or the L2' branch (such as the branch where the grounding point B' is located in Fig. 3) may also choose to use the L2 branch of the second antenna branch 120 (Fig. 3).
  • the branch point where the grounding point C is located) or the branch of the L2' (such as the branch where the grounding point C' is located in Fig. 3). Therefore, there are four design schemes for an antenna branch antenna (that is, you can choose to set B or B' or C or C's one branch), which can be selected according to the specific situation.
  • the second inductor L2 may be connected to the end of the first antenna branch 110, the second inductor L2' may be connected to the middle of the first antenna branch 110, and the first antenna is The end of the branch 120 is connected to the second inductor L2, and the second inductor L2' is connected to the middle of the first antenna branch 110.
  • the branch point of the ground point B and the ground point C can be used as the antenna module respectively.
  • the first antenna branch and the second antenna branch, and the branch point where the ground point B and the ground point C' are also selected may be respectively used as the first antenna branch and the second antenna branch of the antenna module, and the ground point B' and the ground point C may also be selected.
  • the branch roads are respectively used as the first antenna branch and the second antenna branch of the antenna module, and the branch points of the ground point B' and the ground point C' may be selected as the first antenna branch and the second antenna branch of the antenna module, respectively.
  • the grounding points B and C of the present invention are taken as an example. As shown in FIG. 3, two arrow symbols indicate a loop of an NFC signal.
  • the NFC signal is branched by the link module 200 through two antennas of the antenna, and then passes through B and C to ground.
  • the NFC module shares an antenna with an existing module (such as a radio frequency module) of the mobile terminal. Once the product is fixed, the antenna shared with the NFC module cannot be changed.
  • the second preferred embodiment of the present invention can be selected in real time according to actual conditions.
  • the high frequency module is at least one, and when the number of the high frequency modules is two or more, The number of antenna modules and the number of link modules are greater than or equal to the number of high frequency modules.
  • the mobile terminal further includes a splitter 40 for selecting one of the plurality of antenna modules to be connected to the NFC module 300 when the NFC module is in operation; the NFC module 300 is connected to each link module 200 through the splitter 40.
  • the high frequency module is the radio frequency module 500 and the GPS/WIFI module 70
  • the antenna module is the diversity antenna 20 and the GPS/WIFI antenna 30.
  • the diversity antenna 20 is connected to the splitter 200 via a link module 200
  • the GPS/WIFI antenna 30 is also connected to the splitter 200 via a link module 200.
  • the mobile phone in order to ensure the normal operation of the mobile phone, the mobile phone also needs to include the main antenna 10 and the baseband chip 50. At this time, the mobile phone also needs to add a link module 200, and the radio frequency module 500 also connects the main antenna 10 through a link module.
  • the baseband chip is respectively connected to the radio frequency module 500, the GPS/WIFI module 70 and the NFC module 300, and controls the operations of the radio frequency module 500, the GPS/WIFI module 70 and the NFC module 300.
  • the number of link modules corresponds to the number of antennas
  • the splitter 40 functions as a switch to control the connection relationship between the NFC module and the plurality of shared antennas.
  • NFC is currently commercially available at 13.56MHz. If there is a new working frequency, such as 20M or 30M for near-field communication, it can be debugged by splitter 40 to share one of the above antennas and let NFC Work at multiple different frequencies.
  • the splitter 40 can be designed as a duplexer or a triplexer according to the actual number of operating frequency points required.
  • the splitter 40 can also switch through the switching effect, and after reading the field strength of different antennas in a short time, select the antenna with the best field strength among the multiple antennas to work.
  • the splitter plays two roles. The first one is to let the NFC work at different frequency points at the same time (not only limited to a frequency of 13.56MHz, but also can work at different frequency points such as 20/30MHz). Achieving a common design of NFC antennas and different antennas makes NFC applications more widely available.
  • the second one belongs to the function of the smart antenna.
  • the multiple shared antennas of the NFC work at the same frequency. When the NFC is turned on, the antennas are switched in real time in multiple antennas, the field strength of the received field is read, and the antenna with the best effect is selected to work. .
  • the mobile terminal sharing the NFC antenna connects the NFC module and the corresponding antenna through the link module by adding a link module, so that the NFC signal can be transmitted through the original antenna without additional setting independence.
  • the NFC antenna effectively reduces the difficulty and cost of the design and saves equipment space.
  • the frequency range of the NFC application is wider, and it is also possible to switch multiple antennas in real time, read the received field strength, and intelligently select the one with the best performance for communication, which has a good application prospect.

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Abstract

本发明提供了一种共用NFC天线的移动终端，其包括：NFC模块、高频模块、链接模块和天线模块，所述链接模块用于分隔NFC模块工作频率和高频模块工作频率，天线模块用于产生NFC模块工作所需谐振频率及高频模块工作所需谐振频率。本发明有效的降低了NFC天线的设计的难度、节省了设备空间，还降低了设备成本，具备良好的应用前景。

Description

一种共用NFC天线的移动终端 技术领域
本发明涉及移动设备天线设计领域，尤其涉及一种共用NFC天线的移动终端。
 背景技术
随着通信技术的发展，手机等移动通信产品已经成为人们必不可少的设备。NFC功能逐渐成为移动通信设备的必备功能。
近场通信（Near Field Communication,NFC）是一种短距高频的无线电技术，工作频率为13.56MHz，于20厘米的距离范围内运行。NFC具备短距离通信的特性，并具有耗电量低、又可以让移动或者其他电子设备直接相互通讯，同时拥有较高的保密性与安全性等优点，逐渐成为各种移动设备的必备功能。
当前手机通信技术飞速发展，LTE（Long Term Evolution，长期演进，俗称4G)，WIFI/BT、GPS、无线充电、以及NFC成为了移动通信设备必不可少的功能，但是设备依旧需要更多的天线提供给不同的功能模块使用。如图1所示，现有手机设计框架中，一般包括基带芯片50、NFC模块300、射频模块500、GPS/WIFI模块70和天线模块。而天线模块又具体包括主天线10、分集天线20、GPS/WIFI天线30和NFC天线80。随着功能的增加，使移动通信设备比如手机上需要增设越来越多的天线。而移动设备如手机上的每一个天线的设计都需要一定的空间和成本，天线越多，设备也就需要更大的空间、而且成本上升，设计难度越来越变大。尤其是NFC天线占的空间较大，为了避免干扰，还需要增加与NFC天线面积相当的、且价格昂贵的铁氧体。
 技术问题
鉴于上述现有技术的不足之处，本发明的目的在于提供一种共用NFC天线的移动终端，旨在解决现有移动设备中需要额外设置NFC天线，成本高、占用空间大、设计困难的问题。
 技术解决方案
为了达到上述目的，本发明采取了以下技术方案：
一种共用NFC天线的移动终端，其包括：
NFC模块；
至少一高频模块；
至少一链接模块，用于分隔所述NFC模块的工作频率和所述高频模块的工作频率；以及
至少一天线模块，用于产生所述NFC模块工作所需谐振频率及所述高频模块工作所需谐振频率；
其中所述NFC模块和所述高频模块均通过所述链接模块与所述天线模块相连；
其中所述链接模块包括第一电感和第一电容，所述第一电容的一端和所述第一电感的一端均连接所述天线模块，所述第一电容的另一端连接所述高频模块，所述第一电感的另一端连接所述NFC模块；
所述天线模块包括第二电容以及至少一个天线分支，每个所述天线分支包括一第二电感；所述第二电感位于相应的所述天线分支的末端或者中部，所述第二电感的一端接地，所述第二电感的另一端通过所述第二电容接地，所述第二电感的另一端还连接所述链接模块。
所述的共用NFC天线的移动终端中，所述第一电感的感值为50~120nh，所述第一电容的容值为50~120pf。
所述的共用NFC天线的移动终端中，所述天线分支包括两个第二电感；两个所述第二电感分别位于相应的所述天线分支的末端以及中部。
所述的共用NFC天线的移动终端中，所述第二电感的感值为30~120nh，所述第二电容的容值大于12pf。
所述的共用NFC天线的移动终端中，所述天线模块的数量大于或等于所述高频模块的数量，所述链接模块的数量大于或等于所述高频模块的数量；
所述移动终端还包括：
分离器，用于所述NFC模块工作时，选择多个所述天线模块中的一个与所述NFC模块连接；所述NFC模块通过所述分离器连接各个所述链接模块。
所述的共用NFC天线的移动终端中，所述高频模块为射频模块、全球定位系统模块或无线保真模块。
所述的共用NFC天线的移动终端中，所述天线模块为分集天线、全球定位系统天线或无线保真天线。
所述的共用NFC天线的移动终端中，所述移动终端还包括主天线，所述射频模块通过一所述链接模块连接所述主天线。
所述的共用NFC天线的移动终端中，所述移动终端还包括基带芯片，所述基带芯片分别连接所述高频模块以及所述NFC模块。
一种共用NFC天线的移动终端，其包括：
NFC模块；
至少一高频模块；
至少一链接模块，用于分隔所述NFC模块的工作频率和所述高频模块的工作频率；以及
至少一天线模块，用于产生所述NFC模块工作所需谐振频率及所述高频模块工作所需谐振频率；
其中所述NFC模块和所述高频模块均通过所述链接模块与所述天线模块相连。
所述的共用NFC天线的移动终端中，所述链接模块包括第一电感和第一电容，所述第一电容的一端和所述第一电感的一端均连接所述天线模块，所述第一电容的另一端连接所述高频模块，所述第一电感的另一端连接所述NFC模块。
所述的共用NFC天线的移动终端中，所述第一电感的感值为50~120nh，所述第一电容的容值为50~120pf。
所述的共用NFC天线的移动终端中，所述天线模块包括第二电容以及至少一个天线分支，每个所述天线分支包括一第二电感；所述第二电感位于相应的所述天线分支的末端或者中部，所述第二电感的一端接地，所述第二电感的另一端通过所述第二电容接地，所述第二电感的另一端还连接所述链接模块。
所述的共用NFC天线的移动终端中，所述天线模块包括第二电容以及至少一个天线分支，每个所述天线分支包括两个第二电感；所述第二电感分别位于相应的所述天线分支的末端以及中部，所述第二电感的一端接地，所述第二电感的另一端通过所述第二电容接地，所述第二电感的另一端还连接所述链接模块。
所述的共用NFC天线的移动终端中，所述第二电感的感值为30~120nh，所述第二电容的容值大于12pf。
所述的共用NFC天线的移动终端中，所述天线模块的数量大于或等于所述高频模块的数量，所述链接模块的数量大于或等于所述高频模块的数量；
所述移动终端还包括：
分离器，用于所述NFC模块工作时，选择多个所述天线模块中的一个与所述NFC模块连接；所述NFC模块通过所述分离器连接各个所述链接模块。
所述的共用NFC天线的移动终端中，所述高频模块为射频模块、全球定位系统模块或无线保真模块。
所述的共用NFC天线的移动终端中，所述天线模块为分集天线、全球定位系统天线或无线保真天线。
所述的共用NFC天线的移动终端中，所述移动终端还包括主天线，所述射频模块通过一所述链接模块连接所述主天线。
所述的共用NFC天线的移动终端中，所述移动终端还包括基带芯片，所述基带芯片分别连接所述高频模块以及所述NFC模块。
 有益效果
本发明提供的共用NFC天线的移动终端，通过增设链接模块，通过链接模块连接NFC模块和对应的天线，使NFC信号能够通过原有天线进行传输，实现天线共享，不需要额外设置独立的NFC天线，有效的降低了设计的难度、节省了设备空间，还降低了设备成本，具备良好的应用前景。
 附图说明
图1为现有技术的手机天线设计框架图。
图2为本发明提供的共用NFC天线的移动终端的一较佳实施例的结构框图。
图3为本发明提供的共用NFC天线的移动终端的天线的具体实施例的电路图。
图4为本发明提供的共用NFC天线的移动终端的另一较佳实施例的结构框图。
图5为本发明提供的共用NFC天线的移动终端的以射频模块例的具体实施例的结构框图。
 本发明的最佳实施方式
本发明提供一种共用NFC天线的移动终端。为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
如图2所示，本发明提供的共用NFC天线的移动终端的一个较佳实施例包括NFC模块300、至少一高频模块400、至少一天线模块100和至少一链接模块200。NFC模块300和高频模块400分别通过链接模块200与天线模块100相连。
所述天线模块100既能够产生低频谐振频率（具体由NFC模块的工作频点确定），也可以产生高频谐振频率（对应高频模块的工作频率），以使天线模块100能够同时满足低频的NFC信号以及高频模块工作所需工作信号的要求。链接模块200则可以分隔NFC模块的工作频率和高频模块的工作频率（例如NFC工作频率是13.56MHz，而射频工作频率都在700Mhz以上），起到双工的作用，使NFC模块300和高频模块400可以同时工作。
本发明通过采用可产生高频及低频谐振频率的天线模块100及链接模块200，使高频模块400与NFC模块300在共用一个天线的同时不会相互影响，可以同时工作，减少了天线的数量，从而有效的解决了单独设置NFC天线成本较高、设计困难的问题。
应当说明的是，所述高频模块400可以为移动设备内任何工作与NFC工作频点之间相差较大的模块，它可以是超过一到两个数量级的模块，例如射频模块，全球定位系统模块（GPS）模块或无线保真（WIFI）模块等。为阐述方便，以下以射频模块500为例进行描述。
具体的，为实现分隔NFC及射频工作频率，如图5所示，所述链接模块200包括第一电感L1和第一电容C1。所述第一电容C1的一端和第一电感L1的一端均连接天线模块100，第一电容C1的另一端与射频模块500连接，第一电感L1的另一端与NFC模块300连接。链接模块200利用电容元件通高频阻低频和电感元件通低频阻高频的特性，能够实现良好的分隔高频及低频信号的技术效果。
第一电容C1的作用主要是阻隔NFC工作频率的信号，避免影响到射频模块的正常工作。相类似的，电感的作用是阻隔射频信号，避免干扰到NFC模块的正常工作，从而使NFC模块300及射频模块500可以同时工作，互不影响。在一般情况下，为提供足够的阻抗，实现高低频的分隔，可以将第一电感L1的感值设置为50~120nh，第一电容C1的容值设置为50~120pf。当然，依据实际情况的需要，如对阻抗，灵敏度有特别要求时，第一电容C1的电容值可以适当扩大到150pf或者减少到22~33pf。相应的，第一电感L1的感值可以适当扩大到150nh或者减小到30nh。
更具体的，由于NFC为近场通讯，主要依靠磁场耦合进行信息传递，天线模块中的天线采用环形天线的设计，而现有的天线（如主天线、分集天线和GPS/WIFI天线）均采用倒F天线设计。因此，为实现天线模块100需要同时满足应用NFC信号及射频信号的要求，可以在天线分支的接地点上进行改进。
如图3所示，所述天线模块100包括第二电容C2、一个或者两个天线分支，以天线模块包括两个天线分支为例，两个天线分支包括产生700M~1GHz的低频谐振频率的第一天线分支110及产生1700~2700MHz的高频谐振频率的第二天线分支120，两个天线分支有一至两个公共接地点。
以图3中一个公共接地点A为例，该接地点A增加了第二电容C2，由于第二电容C2的电气特性，可以为700MHz以上（即射频信号）频点提供极低的阻抗，同时对NFC频点（例如13.5MHz）形成非常大的阻抗，对其形成阻隔，使射频信号从此路径到地，并避免NFC信号从此路径到地。在一般情况下，所述第二电容的电容值应当大于12pf。在特殊情况下，可以适当扩大到150pf。
在天线模块100中，每个天线分支包括一个第二电感L2；所述第二电感L2位于相应天线分支的末端或者中部，所述第二电感L2的一端接地，所述第二电感L2的另一端通过第二电容C2接地，同时所述第二电感L2的另一端还连接所述链接模块200。
若只为NFC信号设置一个天线分支，则可以在天线分支的末端或中部设置一个第二电感L2。所述第二电感L2的作用与第二电容C2相反，可以为NFC频点提供低阻抗，让NFC频率信号从此路径到地，而对700MHz以上的频率形成高阻抗发挥阻隔作用，避免700MHz以上的频点从此路径到地。
在一般情况下，所述第二电感L2的电感值设置为30~120nh即可满足对阻抗的需求。应当说明的是，上述设置在天线的接地点的第二电感L2还可以根据实际情况调整电感值的大小，发挥对NFC进行匹配的作用，使天线能够产生NFC模块所需要的谐振频率。
实际使用时，图3中的第二电感L2接在相应天线分支的末端，第二电感L2`接在相应天线分支的中部，在实际设计天线模块时，可选择使用第一天线分支110的L2支路（如图3中接地点B所在支路）或者L2`支路（如图3中接地点B`所在支路），也可以选择使用第二天线分支120的L2支路（如图3中接地点C所在支路）或者L2`支路（如图3中接地点C`所在支路）。因此，一个天线分支的天线有四种设计方案（即可以选择设置B或B`或C或C`所在的一条支路），可以根据具体情况选择。
若需要为NFC信号提供两个天线分支，则可以在第一天线分支110的末端末端接入第二电感L2，在第一天线分支110的中部接入第二电感L2`，以及在第一天线分支120的末端末端接入第二电感L2，在第一天线分支110的中部接入第二电感L2`，在设计天线时，可选用接地点B和接地点C所在支路分别作为天线模块的第一天线分支和第二天线分支、也可选用接地点B和接地点C`所在支路分别作为天线模块的第一天线分支和第二天线分支、也可选用接地点B`和接地点C所在支路分别作为天线模块的第一天线分支和第二天线分支、还可以选用接地点B`和接地点C`所在支路分别作为天线模块的第一天线分支和第二天线分支。
本发明接地点B和C为例，如图3所示，两个箭头符号表示NFC信号的回路，NFC信号由链接模块200经过天线的两个天线分支，然后经过B和C到地。
上述实施例是将NFC模块与移动终端现有的一个模块（如射频模块）共用一个天线，产品一旦固定，与NFC模块共用的天线将不能更改。本发明提供的第二较佳实施例可根据实际情况实时选择，如图4所示的实施例中，所述高频模块至少为一个，当所述高频模块的数量为两个以上时，天线模块的数量及链接模块的数量大于或等于高频模块的数量。并且移动终端还需包括分离器40，用于NFC模块工作时选择多个天线模块中的一个与NFC模块300连接；所述NFC模块300通过分离器40连接各个链接模块200。
当高频模块为两个时，如高频模块为射频模块500和GPS/WIFI模块70，天线模块为分集天线20和GPS/WIFI天线30。分集天线20通过一个链接模块200连接分离器200，GPS/WIFI天线30也通过一个链接模块200连接分离器200。
以移动终端为手机为例，为保证手机的正常工作，手机还需包括主天线10和基带芯片50，此时手机还需增设一个链接模块200，射频模块500还通过一链接模块连接主天线10，基带芯片分别连接射频模块500、GPS/WIFI模块70和NFC模块300，控制射频模块500、GPS/WIFI模块70和NFC模块300的工作。
本实施例中，链接模块数量与天线数量对应，所述分离器40发挥开关的作用，可以控制NFC模块与多个共用天线之间的连接关系。NFC目前在市面上商用的工作频点在13.56MHz，如果有新的工作频点，例如20M或者30M等适用于近场通讯的，可以通过分离器40调试，共用上述天线中的一个，让NFC工作在多个不同的频点。
应当说明的是，所述分离器40可以依据实际所需要的工作频点数量设计成双工器或者三工器等。
若NFC模块只工作在单一的频点，分离器40还可以通过其开关切换作用，极短的时间内读出不同天线的场强后，选择多个天线中场强最好的天线进行工作。
总的来说，分离器发挥两个作用，第一个是让NFC同时工作在不同的频点（不仅仅局限于13.56MHz一个频点，可以同时工作在不同的频点如20/30MHz），实现NFC天线和不同天线的共用的设计使NFC应用范围更为广泛。第二个则属于智能天线的作用，NFC的多个共用天线工作在同一频点，当开启NFC后，实时在多个天线切换，读取接收的场强大小，选择效果最好的天线进行工作。
综上所述，本发明提供的一种共用NFC天线的移动终端，通过增设链接模块，通过链接模块连接NFC模块和对应的天线，使NFC信号能够通过原有天线进行传输，不需要额外设置独立的NFC天线，有效的降低了设计的难度和成本、而且节省了设备空间。另外，通过设置分离器，使NFC应用的频点范围更为广泛，还可以实时切换多个天线，读取接收的场强大小，智能选择性能最好的一个进行通信，具备良好的应用前景。
可以理解的是，对本领域普通技术人员来说，可以根据本发明的技术方案及本发明构思加以等同替换或改变，而所有这些改变或替换都应属于本发明所附的权利要求的保护范围。

Claims (20)

  1. 一种共用NFC天线的移动终端，其包括：
    NFC模块；
    至少一高频模块；
    至少一链接模块，用于分隔所述NFC模块的工作频率和所述高频模块的工作频率；以及
    至少一天线模块，用于产生所述NFC模块工作所需谐振频率及所述高频模块工作所需谐振频率；
    其中所述NFC模块和所述高频模块均通过所述链接模块与所述天线模块相连；
    其中所述链接模块包括第一电感和第一电容，所述第一电容的一端和所述第一电感的一端均连接所述天线模块，所述第一电容的另一端连接所述高频模块，所述第一电感的另一端连接所述NFC模块；
    所述天线模块包括第二电容以及至少一个天线分支，每个所述天线分支包括一第二电感；所述第二电感位于相应的所述天线分支的末端或者中部，所述第二电感的一端接地，所述第二电感的另一端通过所述第二电容接地，所述第二电感的另一端还连接所述链接模块。
  2. 根据权利要求1所述的共用NFC天线的移动终端，其中所述第一电感的感值为50~120nh，所述第一电容的容值为50~120pf。
  3. 根据权利要求1所述的共用NFC天线的移动终端，其中所述天线分支包括两个第二电感；两个所述第二电感分别位于相应的所述天线分支的末端以及中部。
  4. 根据权利要求1所述的共用NFC天线的移动终端，其中所述第二电感的感值为30~120nh，所述第二电容的容值大于12pf。
  5. 根据权利要求1所述的共用NFC天线的移动终端，其中所述天线模块的数量大于或等于所述高频模块的数量，所述链接模块的数量大于或等于所述高频模块的数量；
    所述移动终端还包括：
    分离器，用于所述NFC模块工作时，选择多个所述天线模块中的一个与所述NFC模块连接；所述NFC模块通过所述分离器连接各个所述链接模块。
  6. 根据权利要求5所述的共用NFC天线的移动终端，其中所述高频模块为射频模块、全球定位系统模块或无线保真模块。
  7. 根据权利要求5所述的共用NFC天线的移动终端，其中所述天线模块为分集天线、全球定位系统天线或无线保真天线。
  8. 根据权利要求5所述的共用NFC天线的移动终端，其中所述移动终端还包括主天线，所述射频模块通过一所述链接模块连接所述主天线。
  9. 根据权利要求8所述的共用NFC天线的移动终端，其中所述移动终端还包括基带芯片，所述基带芯片分别连接所述高频模块以及所述NFC模块。
  10. 一种共用NFC天线的移动终端，其包括：
    NFC模块；
    至少一高频模块；
    至少一链接模块，用于分隔所述NFC模块的工作频率和所述高频模块的工作频率；以及
    至少一天线模块，用于产生所述NFC模块工作所需谐振频率及所述高频模块工作所需谐振频率；
    其中所述NFC模块和所述高频模块均通过所述链接模块与所述天线模块相连。
  11. 根据权利要求10所述的共用NFC天线的移动终端，其中所述链接模块包括第一电感和第一电容，所述第一电容的一端和所述第一电感的一端均连接所述天线模块，所述第一电容的另一端连接所述高频模块，所述第一电感的另一端连接所述NFC模块。
  12. 根据权利要求11所述的共用NFC天线的移动终端，其中所述第一电感的感值为50~120nh，所述第一电容的容值为50~120pf。
  13. 根据权利要求10所述的共用NFC天线的移动终端，其中所述天线模块包括第二电容以及至少一个天线分支，每个所述天线分支包括一第二电感；所述第二电感位于相应的所述天线分支的末端或者中部，所述第二电感的一端接地，所述第二电感的另一端通过所述第二电容接地，所述第二电感的另一端还连接所述链接模块。
  14. 根据权利要求10所述的共用NFC天线的移动终端，其中所述天线模块包括第二电容以及至少一个天线分支，每个所述天线分支包括两个第二电感；所述第二电感分别位于相应的所述天线分支的末端以及中部，所述第二电感的一端接地，所述第二电感的另一端通过所述第二电容接地，所述第二电感的另一端还连接所述链接模块。
  15. 根据权利要求10所述的共用NFC天线的移动终端，其中所述第二电感的感值为30~120nh，所述第二电容的容值大于12pf。
  16. 根据权利要求10所述的共用NFC天线的移动终端，其中所述天线模块的数量大于或等于所述高频模块的数量，所述链接模块的数量大于或等于所述高频模块的数量；
    所述移动终端还包括：
    分离器，用于所述NFC模块工作时，选择多个所述天线模块中的一个与所述NFC模块连接；所述NFC模块通过所述分离器连接各个所述链接模块。
  17. 根据权利要求16所述的共用NFC天线的移动终端，其中所述高频模块为射频模块、全球定位系统模块或无线保真模块。
  18. 根据权利要求16所述的共用NFC天线的移动终端，其中所述天线模块为分集天线、全球定位系统天线或无线保真天线。
  19. 根据权利要求16所述的共用NFC天线的移动终端，其中所述移动终端还包括主天线，所述射频模块通过一所述链接模块连接所述主天线。
  20. 根据权利要求19所述的共用NFC天线的移动终端，其中所述移动终端还包括基带芯片，所述基带芯片分别连接所述高频模块以及所述NFC模块。
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