WO2020024673A1 - 移动终端的天线***及移动终端 - Google Patents

移动终端的天线***及移动终端 Download PDF

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Publication number
WO2020024673A1
WO2020024673A1 PCT/CN2019/088099 CN2019088099W WO2020024673A1 WO 2020024673 A1 WO2020024673 A1 WO 2020024673A1 CN 2019088099 W CN2019088099 W CN 2019088099W WO 2020024673 A1 WO2020024673 A1 WO 2020024673A1
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WO
WIPO (PCT)
Prior art keywords
branch
ground
feeding
mobile terminal
radiator
Prior art date
Application number
PCT/CN2019/088099
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English (en)
French (fr)
Inventor
沈亚川
Original Assignee
瑞声声学科技(深圳)有限公司
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Publication of WO2020024673A1 publication Critical patent/WO2020024673A1/zh

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Classifications

    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • 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
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • 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
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the utility model relates to the technical field of wireless communications, and in particular, to an antenna system for a mobile terminal and a mobile terminal.
  • Portable mobile terminals such as mobile phones, tablet computers, etc. are all provided with an antenna system so as to be able to receive and transmit electromagnetic wave signals for wireless communication.
  • the technical problem to be solved by the utility model is to provide a compact antenna system.
  • the present invention provides an antenna system for a mobile terminal.
  • the mobile terminal includes a housing, a main board housed in the housing, a plastic bracket covering the main board, and a mounting bracket.
  • the USB interface on the main board, the antenna system includes a radiator formed on a surface of the plastic bracket facing the housing, and a feeding point, a first ground point, and a second ground point provided on the main board.
  • the radiator includes a power feeding terminal and a ground feeding terminal spaced from each other in a short axis direction of the mobile terminal, a connection terminal connecting the power feeding terminal and the ground feeding terminal, and a first terminal connected to the ground feeding terminal.
  • the radiator further includes a third branch that is in contact with the ground feeding end and is located within the opening of the first branch
  • the antenna system further includes First matching circuit, second matching circuit, and tuning switch
  • the feeding terminal is connected to the feeding point through the first matching circuit, the feeding terminal is connected to the first ground point through the second matching circuit, and the first branch is connected through the A tuning switch is connected to the second ground point
  • the USB interface includes a housing portion and foot grip portions located on both sides of the housing portion and connected to the main board, and the radiator and the housing portion The orthographic projections on the main board do not overlap each other.
  • the plastic bracket includes a first portion opposite to the main board and a second portion extending from an edge of the first portion toward a direction close to the main board, the power feeding end, the ground feeding end, and the The connecting ends are located in the first part, the connecting ends connect the feeding end and the ground feeding end near an end of the second part, and the first branch includes a distance from the ground feeding end away from the A first branch of which one end extends along the short axis of the mobile terminal away from the feeding end, a second branch extending from an end of the first branch away from the feeding end toward the second part, and A third branch extending from the end of the second branch away from the first branch along the short axis of the mobile terminal toward the feeding end; the second branch includes A fourth branch extending away from the ground feeding end direction, a fifth branch extending from the fourth branch toward the second portion, and an end away from the fourth branch away from the fourth branch toward the feeder A sixth branch extending in the direction of the ground end; A branch extends from an end of the ground feeding end close to
  • the tuning switch is connected to the first branch.
  • the tuning switch has an open circuit state, a first capacitor access state, and a first inductance access state;
  • the tuning switch When the tuning switch is in an open circuit state, the first branch is disconnected from the second ground point;
  • the tuning switch When the tuning switch is in a first capacitor access state, the first branch is connected to the second ground point through the first capacitor;
  • the tuning switch When the tuning switch is in a first inductance access state, the first branch is connected to the second ground point through the first inductance.
  • the capacitance value of the first capacitor is 0.6 pF, and the inductance value of the first inductor is 84 nH;
  • the first matching circuit includes a second capacitor having a capacitance value of 8 pF, and one end of the second capacitor is in contact with The feeding end is connected, and the other end is connected to the feeding point;
  • the second matching circuit includes a second inductor with an inductance value of 2 nH, one end of the second inductor is connected to the ground feeding end, and the other end Connected to the first ground point;
  • the working frequency band covered by the radiator is 790 to 862 MHz;
  • an operating frequency band covered by the radiator is 814 to 894 MHz;
  • the working frequency bands covered by the radiator are 880 ⁇ 960MHz and 1710 ⁇ 2690MHz.
  • the radiator is formed on a surface of the plastic bracket facing the casing by an LDS process.
  • the utility model also provides a mobile terminal including the antenna system according to any one of the above.
  • the mobile terminal further includes a microphone installed on the motherboard and located below the radiator, the second ground point is located between the USB interface and the microphone, and the first ground point and the The feeding point is located on a side of the microphone away from the USB interface.
  • the antenna system of the mobile terminal provided by the present utility model has the following beneficial effects:
  • the radiator does not cross the USB interface, reducing the impact of the USB interface on the antenna, and it is convenient to adjust the position of the radiator and the USB interface, and the operable space is larger.
  • FIG. 1 is an exploded schematic diagram of a mobile terminal according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an assembly of a radiator and a plastic bracket in the mobile terminal shown in FIG. 1;
  • FIG. 3 is a schematic structural diagram of a radiator in the mobile terminal shown in FIG. 1;
  • FIG. 4 is a schematic diagram of a partial stereo structure of the mobile terminal shown in FIG. 2;
  • FIG. 5 is a schematic diagram of a circuit connection structure in the antenna system of the mobile terminal shown in FIG. 1;
  • FIG. 6 is a graph showing a simulation result of return loss of an antenna system of a mobile terminal according to an embodiment of the present invention.
  • FIG. 7 is a curve diagram of an antenna efficiency simulation effect of an antenna system of a mobile terminal according to an embodiment of the present invention.
  • an embodiment of the present invention provides an antenna system for a mobile terminal.
  • the antenna system can receive and send electromagnetic wave signals, thereby realizing the communication function of the mobile terminal. iPad, POS, etc., this utility model does not limit this.
  • the mobile terminal 100 provided by the embodiment of the present invention includes a screen 10, a housing 201 supporting the screen 10 and surrounding the screen, a housing 201, a main board 30 housed in the housing 201, and a main board 30 mounted on the main board 30.
  • USB interface 40 is used for connection and communication between a mobile terminal and an external device.
  • the USB interface 40 includes a housing portion 41 and foot gripping portions 42 located on both sides of the housing portion 41 and connected to the motherboard 30.
  • the microphone 50 is used to convert a sound signal into an electric signal to enable a mobile terminal to implement a call and recording function, and the antenna system is used to implement a communication function for the mobile terminal.
  • the mobile terminal 100 further includes a plastic bracket 203 disposed in the casing 201 and covered on the motherboard 30.
  • the plastic bracket 203 includes a first portion 2031 opposite to the main board 30 and a second portion 2032 extending from an edge of the first portion 2031 toward the main board 30.
  • the second portion 2032 is provided with a first through hole 2033 communicating with the front end of the USB interface 40 and a second through hole 2034 communicating with the front end of the microphone 50.
  • the antenna system includes a radiator 1 formed on the surface of the plastic bracket 203, and a feeding point 2, a first ground point 3, a second ground point 4, a first matching circuit 5, a first Two matching circuits 6 and tuning switches 7.
  • the orthographic projections of the radiator 1 and the housing portion 41 of the USB interface 40 on the motherboard 30 do not overlap each other.
  • the radiator 1 may be laser-lased on a surface of the plastic bracket 203 facing the casing 201 by using an LDS process. In this embodiment, the radiator 1 is disposed at the lower right corner of the housing 201.
  • the radiator 1 is not Crossing the USB interface 40 reduces the influence of the USB interface 40 on the antenna, and it is convenient to adjust the installation position of the radiator 1 or the USB interface 40, and the operable space is larger.
  • the radiator 1 includes a power feeding terminal 11 and a ground feeding terminal 12 spaced from each other in a short axis direction of the mobile terminal 100, a connection terminal 13 connecting the power feeding terminal 11 and the ground feeding terminal 12, and A first branch 14 connected to the ground feeding terminal 12, a second branch 15 connected to the power feeding terminal 11, and a third branch 16 connected to the ground feeding terminal 12.
  • the first branch 14 and the second branch 15 are both bent to form a semi-closed structure with an opening, and the opening of the first branch 14 is opposite to and spaced from the opening of the second branch 15.
  • the third branch section 16 is located in the opening of the first branch section 14.
  • the power feeding terminal 11, the ground feeding terminal 12, and the connection terminal 13 are all located in the first portion 2031, and the connection terminal 13 connects the power feeding terminal 11 and the ground feeding terminal 12 near the first One end of two parts 2032.
  • the first branch 14 includes a first branch 141 extending from the ground feeding end 12 away from the connection end 13 in a direction away from the power feeding end 11 along the short axis of the mobile terminal 100, and An end of the first branch 141 farther from the ground feeding end 12 toward the second portion 2032 and an end of the second branch 142 farther from the first branch 141 away from the first branch 141 are along the mobile terminal 100.
  • the short-axis direction is close to the third branch 143 extending in the direction of the feeding end 11.
  • the second branch 15 includes a fourth branch 151 extending from the feeding end 11 in a direction away from the ground feeding end 12, and a fifth branch extending from the fourth branch 151 toward the second portion 2302. 152 and a sixth branch 153 extending from an end of the fifth branch 152 far from the fourth branch 151 toward the ground feeding end 12.
  • the third branch 16 extends from an end of the ground feeding end 12 close to the connection end 13 along a short axis of the mobile terminal 100 away from the power feeding end 11.
  • the third branch 16 and The first branch 141, the second branch 142, and the third branch 143 are all disposed at intervals.
  • the feeding point 2 is connected to the feeding terminal 11 through the first matching circuit 5, and the first ground point 3 is connected to the feeding terminal 12 through the second matching circuit 6.
  • the two ground points 4 are connected to the first branch 14 through the tuning switch 7. More preferably, the tuning switch 7 is connected to the first branch 141.
  • a clearance area (not labeled) is provided on the motherboard 30.
  • the orthographic projection of the antenna system to the motherboard 30 is located in the clearance area.
  • the USB interface 40 is located at a middle position on the bottom of the mobile terminal 100.
  • the microphone 50 is disposed on one side of the USB interface 40 and below the radiator 1.
  • the second ground point 4 is located on the USB interface. Between 40 and the microphone 50, the first ground point 3 and the feeding point 2 are located on a side of the microphone 50 away from the USB interface 40.
  • the first matching circuit 5 includes a second capacitor 51.
  • One end of the second capacitor 51 is connected to the feeding terminal 11 of the radiator 1, and the other end is connected to the feeding point 2.
  • the second matching circuit 6 includes a second inductor 61. One end of the second inductor 61 is connected to the ground feeding terminal 12 of the radiator 1, and the other end is connected to the first ground point 3.
  • the tuning switch 7 has an open circuit state, a first capacitor access state, and a first inductance access state.
  • the first branch 14 When the tuning switch 7 is in an open circuit state, the first branch 14 is disconnected from the second ground point 4; when the tuning switch 7 is in a first capacitor access state, the first branch 14 14 is connected to the second ground point 4 through the first capacitor 71; when the tuning switch 7 is in a first inductance access state, the first branch 14 is connected to the second ground through the first inductance 72 The second ground point 4 is connected.
  • the capacitance value of the first capacitor 71 is 0.6 pF
  • the inductance value of the first inductor 72 is 84 nH
  • the capacitance value of the second capacitor is 8 pF
  • the inductance value of the second inductor is 2 nH.
  • the tuning switch 7 in the antenna system of the present invention when the tuning switch 7 in the antenna system of the present invention is in the open circuit state, the first capacitor access state, and the first inductance access state, the return loss and radiation efficiency of each operating frequency band are shown in FIG. 6 and FIG. 7.
  • the abscissa in FIG. 6 and FIG. 7 are frequencies and the unit is GHz.
  • the ordinates in FIG. 6 and FIG. 7 represent the return loss value and radiation efficiency, respectively, in dB.
  • the radiator of the antenna system provided by the utility model is arranged at the lower right corner of the mobile terminal housing, and the orthographic projections of the radiator and the housing portion of the USB interface on the main board do not overlap each other. On the one hand, it saves space compared to the conventional solution It is more suitable for MIMO terminals with an increased number of antennas. On the other hand, the radiator does not cross the USB interface, reducing the impact of the USB interface on the antenna, and it is easy to adjust the position of the radiator and the USB interface, and the operable space is larger.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本实用新型提供一种移动终端的天线***，所述移动终端包括外壳、收容于所述外壳内的主板、罩设于所述主板之上的塑料支架和安装于所述主板上的USB接口，所述天线***包括成型于所述塑料支架朝向所述外壳的表面的辐射体、以及设置在所述主板的馈电点、第一接地点和第二接地点，所述辐射体包括相互间隔的馈电端和馈地端、连接所述馈电端和所述馈地端的连接端、与所述馈地端相接的第一支节、与所述馈电端相接的第二支节及第三支节，所述USB接口包括壳体部和位于所述壳体部两侧且与所述主板相接的抓脚部，所述辐射体与所述壳体部在所述主板上的正投影互不重叠。本实用新型提供的天线***更加节省空间，减少了USB接口对天线的影响。

Description

移动终端的天线***及移动终端 技术领域
本实用新型涉及无线通信技术领域，尤其涉及一种移动终端的天线***及移动终端。
 背景技术
便携式移动终端例如手机、平板电脑等都设置有天线***，以便能够接收和发射电磁波信号实现无线通讯。
随着移动终端的设计越来越趋于超薄化，受到移动终端大小尺寸的限制，天线***与移动终端内部的其它元器件之间的排布必然紧密，通常是将天线***的辐射体跨过USB接口设置，这就带来了USB接口对天线的干扰问题。而且为了满足多输入多输出(MIMO: Multiple-Input Multiple-Output)，移动终端内置的天线数量越来越多，更加增大了天线***与移动终端内部元器件如何布局的难度。
因此，有必要提供一种新的天线***解决上述问题。
 技术问题
本实用新型需要解决的技术问题是提供一种结构紧凑的天线***。
 技术解决方案
为解决上述技术问题，本实用新型提供一种移动终端的天线***，所述移动终端包括外壳、收容于所述外壳内的主板、罩设于所述主板之上的塑料支架和安装于所述主板上的USB接口，所述天线***包括成型于所述塑料支架朝向所述外壳的表面的辐射体、以及设置在所述主板的馈电点、第一接地点和第二接地点，所述辐射体包括在所述移动终端的短轴方向上相互间隔的馈电端和馈地端、连接所述馈电端和所述馈地端的连接端、与所述馈地端相接的第一支节及与所述馈电端相接的第二支节，所述第一支节和所述第二支节均弯折形成具有开口的半封闭结构，且所述第一支节的开口与所述第二支节的开口相对且间隔，所述辐射体还包括与所述馈地端相接且位于所述第一支节的开口内的第三支节，所述天线***还包括第一匹配电路、第二匹配电路和调谐开关，所述馈电端通过所述第一匹配电路与所述馈电点连接，所述馈地端通过所述第二匹配电路与所述第一接地点连接，所述第一支节通过所述调谐开关与所述第二接地点连接，所述USB接口包括壳体部和位于所述壳体部两侧且与所述主板相接的抓脚部，所述辐射体与所述壳体部在所述主板上的正投影互不重叠。
优选的，所述塑料支架包括与所述主板相对设置的第一部分和自所述第一部分边缘向靠近所述主板方向延伸的第二部分，所述馈电端、所述馈地端和所述连接端均位于所述第一部分，所述连接端连接所述馈电端和所述馈地端靠近所述第二部分的一端，所述第一支节包括自所述馈地端远离所述连接端的一端沿所述移动终端的短轴向远离所述馈电端方向延伸的第一分支、自所述第一分支远离所述馈地端的一端向所述第二部分延伸的第二分支及自所述第二分支远离所述第一分支的一端沿所述移动终端的短轴向靠近所述馈电端方向延伸的第三分支；所述第二支节包括自所述馈电端向远离所述馈地端方向延伸的第四分支、自所述第四分支向所述第二部分延伸的第五分支及自所述第五分支远离所述第四分支的一端向靠近所述馈地端方向延伸的第六分支；所述第三支节自所述馈地端靠近所述连接端的一端沿所述移动终端的短轴向远离所述馈电端方向延伸，所述第三支节与所述第一分支、第二分支和第三分支均间隔设置。
优选的，所述调谐开关与所述第一分支连接。
优选的，所述调谐开关具有开路状态、第一电容接入状态和第一电感接入状态；
当所述调谐开关处于开路状态时，所述第一支节与所述第二接地点断开；
当所述调谐开关处于第一电容接入状态时，所述第一支节通过所述第一电容与所述第二接地点连接；
当所述调谐开关处于第一电感接入状态时，所述第一支节通过所述第一电感与所述第二接地点连接。
优选的，所述第一电容的电容值为0.6pF，所述第一电感的电感值为84nH；所述第一匹配电路包括第二电容，其电容值为8pF，所述第二电容一端与所述馈电端连接，另一端与所述馈电点连接；所述第二匹配电路包括第二电感，其电感值为2nH，所述第二电感一端与所述馈地端连接，另一端与所述第一接地点连接；
当所述调谐开关处于第一电容接入状态时，所述辐射体覆盖的工作频段为790~862MHz；
当所述调谐开关处于开路状态时，所述辐射体覆盖的工作频段为814~894MHz；
当所述调谐开关处于第一电感接入状态时，所述辐射体覆盖的工作频段为880~960MHz和1710~2690MHz。
优选的，所述辐射体通过LDS工艺成型于所述塑料支架朝向所述外壳的表面。
本实用新型还提供一种移动终端，其包括上述任一项所述的天线***。
优选的，所述移动终端还包括安装于所述主板并位于所述辐射体下方的麦克风，所述第二接地点位于所述USB接口和所述麦克风之间，所述第一接地点和所述馈电点位于所述麦克风远离所述USB接口的一侧。
 有益效果
与相关技术相比，本实用新型提供的移动终端的天线***具有如下有益效果：
1）相对于常规方案，更加节省空间，更适合天线数量增加的MIMO终端；
2）辐射体不跨过USB接口，减少了USB接口对天线的影响，而且，便于调整辐射体和USB接口的设置位置，可操作空间更大。
 附图说明
为了更清楚地说明本实用新型实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1为本实用新型实施例所提供的移动终端的分解示意图；
图2为图1所示移动终端中辐射体于塑料支架的组装结构示意图；
图3为图1所示移动终端中辐射体的结构示意图；
图4为图2所示移动终端的部分立体结构示意图；
图5为图1所示移动终端的天线***中电路连接结构示意图；
图6为本实用新型实施例所提供的移动终端的天线***的回波损耗仿真效果曲线图；
图7为本实用新型实施例所提供的移动终端的天线***的天线效率仿真效果曲线图。
 本发明的实施方式
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本实用新型的一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本实用新型保护的范围。
如图1-4所示，本实用新型实施例提供了一种移动终端的天线***，此天线***可以接收和发送电磁波信号，进而实现移动终端的通信功能，此处的移动终端可以是手机、ipad以及POS机等，本实用新型对此不作限定。
具体地，本实用新型实施例提供的移动终端100包括屏幕10、支撑屏幕10并与屏幕围成容纳空间的外壳201、收容于所述外壳201内的主板30、安装于所述主板30上的USB接口40和麦克风50、以及天线***。所述USB接口40用于移动终端与外部设备的连接和通讯，其包括壳体部41和位于所述壳体部41两侧且与所述主板30相接的抓脚部42。所述麦克风50用于将声音信号转换成电信号使移动终端实现通话和录音功能，所述天线***用于移动终端实现通信功能。
所述移动终端100还包括设于所述外壳201内、罩设在所述主板30上的塑料支架203。
所述塑料支架203包括与所述主板30相对设置的第一部分2031和自所述第一部分2031边缘向靠近所述主板30方向延伸的第二部分2032。所述第二部分2032设有与所述USB接口40前端连通的第一通孔2033和与所述麦克风50前端连通的第二通孔2034。
所述天线***包括成型于所述塑料支架203表面的辐射体1以及设置在所述主板30上的馈电点2、第一接地点3、第二接地点4、第一匹配电路5、第二匹配电路6和调谐开关7。所述辐射体1与所述USB接口40的壳体部41在所述主板30上的正投影互不重叠。所述辐射体1可以采用LDS工艺镭射于所述塑料支架203朝向所述外壳201的表面。在本实施例中，所述辐射体1布设于外壳201的右下角，一方面，相对于常规方案，更加节省空间，更适合天线数量增加的MIMO终端，另一方面，所述辐射体1不跨过所述USB接口40，减少了所述USB接口40对天线的影响，而且，便于调整所述辐射体1或所述USB接口40的设置位置，可操作空间更大。
所述辐射体1包括在所述移动终端100的短轴方向上相互间隔的馈电端11和馈地端12、连接所述馈电端11和所述馈地端12的连接端13、与所述馈地端12相接的第一支节14及与所述馈电端11相接的第二支节15以及与所述馈地端12相接的第三支节16。所述第一支节14和所述第二支节15均弯折形成具有开口的半封闭结构，且所述第一支节14的开口与所述第二支节15的开口相对且间隔。所述第三支节16位于所述第一支节14的开口内。所述馈电端11、所述馈地端12和所述连接端13均位于所述第一部分2031，所述连接端13连接所述馈电端11和所述馈地端12靠近所述第二部分2032的一端。所述第一支节14包括自所述馈地端12远离所述连接端13的一端沿所述移动终端100的短轴向远离所述馈电端11方向延伸的第一分支141、自所述第一分支141远离所述馈地端12的一端向所述第二部分2032延伸的第二分支142及自所述第二分支142远离所述第一分支141的一端沿所述移动终端100的短轴向靠近所述馈电端11方向延伸的第三分支143。所述第二支节15包括自所述馈电端11向远离所述馈地端12方向延伸的第四分支151、自所述第四分支151向所述第二部分2302延伸的第五分支152及自所述第五分支152远离所述第四分支151的一端向靠近所述馈地端12方向延伸的第六分支153。所述第三支节16自所述馈地端12靠近所述连接端13的一端沿所述移动终端100的短轴向远离所述馈电端11方向延伸，所述第三支节16与所述第一分支141、第二分支142和第三分支143均间隔设置。
所述馈电点2通过所述第一匹配电路5与所述馈电端11连接，所述第一接地点3通过所述第二匹配电路6与所述馈地端12连接，所述第二接地点4通过所述调谐开关7与所述第一支节14连接。更优地，所述调谐开关7与所述第一分支141连接。
在本实施例中，所述主板30上设有净空区域（未标号）。所述天线***向所述主板30的正投影位于所述净空区域内。所述USB接口40位于所述移动终端100底部的中间位置，所述麦克风50设于所述USB接口40一侧且位于所述辐射体1下方，所述第二接地点4位于所述USB接口40和所述麦克风50之间，所述第一接地点3和所述馈电点2位于所述麦克风50远离所述USB接口40的一侧。
请参阅图5，所述第一匹配电路5包括第二电容51，所述第二电容51一端与所述辐射体1的馈电端11连接，另一端与所述馈电点2连接。
所述第二匹配电路6包括第二电感61，所述第二电感61一端与所述辐射体1的馈地端12连接，另一端与所述第一接地点3连接。
所述调谐开关7具有开路状态、第一电容接入状态和第一电感接入状态。当所述调谐开关7处于开路状态时，所述第一支节14与所述第二接地点4断开；当所述调谐开关7处于第一电容接入状态时，所述第一支节14通过所述第一电容71与所述第二接地点4连接；当所述调谐开关7处于第一电感接入状态时，所述第一支节14通过所述第一电感72与所述第二接地点4连接。
优选地，所述第一电容71的电容值为0.6pF，所述第一电感72的电感值为84nH，所述第二电容的电容值为8pF，所述第二电感的电感值为2nH。当所述调谐开关7处于第一电容接入时，所述辐射体1覆盖的工作频段为790~862MHz；当所述调谐开关7处于开路状态时，所述辐射体1覆盖的工作频段为814~894MHz；当所述调谐开关7处于第一电感接入状态时，所述辐射体1覆盖的工作频段为880~960MHz和1710~2690MHz。
基于上述内容，本实用新型的天线***中调谐开关7在开路状态、第一电容接入状态和第一电感接入状态时，各个工作频段的回波损耗和辐射效率如图6和图7所示，其中图6和图7中的横坐标为频率，单位为GHz，图6和图7中的纵坐标分别表示回波损耗值和辐射效率，单位均为dB。
本实用新型提供的天线***的辐射体布设于移动终端外壳的右下角，且辐射体与USB接口的壳体部在主板上的正投影互不重叠，一方面，相对于常规方案，更加节省空间，更适合天线数量增加的MIMO终端，另一方面，辐射体不跨过USB接口，减少了USB接口对天线的影响，而且，便于调整辐射体和USB接口的设置位置，可操作空间更大。
以上所述仅为本实用新型的实施例，并非因此限制本实用新型的专利范围，凡是利用本实用新型说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其它相关的技术领域，均同理包括在本实用新型的专利保护范围内。

Claims (8)

  1. 一种移动终端的天线***，所述移动终端包括外壳、收容于所述外壳内的主板、罩设于所述主板之上的塑料支架和安装于所述主板上的USB接口，所述天线***包括成型于所述塑料支架朝向所述外壳的表面的辐射体、以及设置在所述主板的馈电点、第一接地点和第二接地点，其特征在于，所述辐射体包括在所述移动终端的短轴方向上相互间隔的馈电端和馈地端、连接所述馈电端和所述馈地端的连接端、与所述馈地端相接的第一支节及与所述馈电端相接的第二支节，所述第一支节和所述第二支节均弯折形成具有开口的半封闭结构，且所述第一支节的开口与所述第二支节的开口相对且间隔，所述辐射体还包括与所述馈地端相接且位于所述第一支节的开口内的第三支节，所述天线***还包括第一匹配电路、第二匹配电路和调谐开关，所述馈电端通过所述第一匹配电路与所述馈电点连接，所述馈地端通过所述第二匹配电路与所述第一接地点连接，所述第一支节通过所述调谐开关与所述第二接地点连接，所述USB接口包括壳体部和位于所述壳体部两侧且与所述主板相接的抓脚部，所述辐射体与所述壳体部在所述主板上的正投影互不重叠。
  2. 根据权利要求1所述的天线***，其特征在于，所述塑料支架包括与所述主板相对设置的第一部分和自所述第一部分边缘向靠近所述主板方向延伸的第二部分，所述馈电端、所述馈地端和所述连接端均位于所述第一部分，所述连接端连接所述馈电端和所述馈地端靠近所述第二部分的一端，所述第一支节包括自所述馈地端远离所述连接端的一端沿所述移动终端的短轴向远离所述馈电端方向延伸的第一分支、自所述第一分支远离所述馈地端的一端向所述第二部分延伸的第二分支及自所述第二分支远离所述第一分支的一端沿所述移动终端的短轴向靠近所述馈电端方向延伸的第三分支；所述第二支节包括自所述馈电端向远离所述馈地端方向延伸的第四分支、自所述第四分支向所述第二部分延伸的第五分支及自所述第五分支远离所述第四分支的一端向靠近所述馈地端方向延伸的第六分支；所述第三支节自所述馈地端靠近所述连接端的一端沿所述移动终端的短轴向远离所述馈电端方向延伸，所述第三支节与所述第一分支、第二分支和第三分支均间隔设置。
  3. 根据权利要求2所述的天线***，其特征在于，所述调谐开关与所述第一分支连接。
  4. 根据权利要求1所述的天线***，其特征在于，所述调谐开关具有开路状态、第一电容接入状态和第一电感接入状态；
    当所述调谐开关处于开路状态时，所述第一支节与所述第二接地点断开；
    当所述调谐开关处于第一电容接入状态时，所述第一支节通过所述第一电容与所述第二接地点连接；
    当所述调谐开关处于第一电感接入状态时，所述第一支节通过所述第一电感与所述第二接地点连接。
  5. 根据权利要求4所述的天线***，其特征在于，所述第一电容的电容值为0.6pF，所述第一电感的电感值为84nH；所述第一匹配电路包括第二电容，其电容值为8pF，所述第二电容一端与所述馈电端连接，另一端与所述馈电点连接；所述第二匹配电路包括第二电感，其电感值为2nH，所述第二电感一端与所述馈地端连接，另一端与所述第一接地点连接；
    当所述调谐开关处于第一电容接入状态时，所述辐射体覆盖的工作频段为790~862MHz；
    当所述调谐开关处于开路状态时，所述辐射体覆盖的工作频段为814~894MHz；
    当所述调谐开关处于第一电感接入状态时，所述辐射体覆盖的工作频段为880~960MHz和1710~2690MHz。
  6. 根据权利要求1所述的天线***，其特征在于，所述辐射体通过LDS工艺成型于所述塑料支架朝向所述外壳的表面。
  7. 一种移动终端，其特征在于，包括权利要求1-6任一项所述的天线***。
  8. 根据权利要求7所述的移动终端，其特征在于，所述移动终端还包括安装于所述主板并位于所述辐射体下方的麦克风，所述第二接地点位于所述USB接口和所述麦克风之间，所述第一接地点和所述馈电点位于所述麦克风远离所述USB接口的一侧。
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