WO2014117738A1 - 天线装置和终端设备 - Google Patents

天线装置和终端设备 Download PDF

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Publication number
WO2014117738A1
WO2014117738A1 PCT/CN2014/071740 CN2014071740W WO2014117738A1 WO 2014117738 A1 WO2014117738 A1 WO 2014117738A1 CN 2014071740 W CN2014071740 W CN 2014071740W WO 2014117738 A1 WO2014117738 A1 WO 2014117738A1
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WO
WIPO (PCT)
Prior art keywords
antenna
switch
branch
suspended
antenna device
Prior art date
Application number
PCT/CN2014/071740
Other languages
English (en)
French (fr)
Inventor
冯超
梁铁柱
Original Assignee
华为终端有限公司
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 华为终端有限公司 filed Critical 华为终端有限公司
Priority to EP14745766.7A priority Critical patent/EP2942834B1/en
Publication of WO2014117738A1 publication Critical patent/WO2014117738A1/zh
Priority to US14/816,190 priority patent/US9634385B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • 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
    • H01Q5/342—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
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • 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
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means

Definitions

  • Antenna device and terminal device are antenna device and terminal device
  • the present invention relates to the field of communications technologies, and in particular, to an antenna device and a terminal device. Background technique
  • LTE Long Term Evolution
  • the present invention provides an antenna device and a terminal device, which are switched to different resonant frequencies by a switch control antenna disposed at an end of an antenna branch, thereby avoiding a decrease in antenna efficiency caused by switching loss and without increasing the space occupied by the antenna.
  • the present invention uses the following technical solutions:
  • the present invention provides an antenna device including an antenna and a printed circuit board, the printed circuit board is provided with a feed point and a first ground point, the antenna is connected to the feed point, and the antenna includes a first
  • the antenna device further includes:
  • the first branch end is connected to the first ground point through the first switch; when the first switch is closed, the first branch end is connected to the first ground point When the first switch is turned off, the end of the first branch is suspended.
  • the antenna further includes a second branch, and the end of the second branch is grounded.
  • the antenna further includes a third branch, and the end of the third branch is suspended.
  • the antenna device further includes:
  • the antenna further includes a second branch;
  • the end of the second branch is connected to the second ground point through the second switch;
  • the antenna further includes a third branch, and the end of the third branch is suspended.
  • the present invention provides a terminal device, including:
  • a radio frequency module connected to a feed point on a printed circuit board of the antenna device
  • the terminal device is a mobile phone, a data card, a fixed station or a tablet computer.
  • the antenna device and the terminal device in the embodiment of the present invention control whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, the switch is not introduced. The loss, therefore, increases the antenna bandwidth while avoiding the reduction in antenna efficiency caused by switching losses, and does not increase the footprint of the antenna.
  • FIG. 1 is a schematic structural diagram of an antenna device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of another antenna device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of another antenna device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another antenna device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of an antenna efficiency according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another antenna device according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of another antenna device according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • an embodiment of the present invention provides an antenna device including an antenna 1 and a printed circuit board 2 .
  • the printed circuit board 2 is provided with a feed point 3 and a first ground point 41 , and the antenna 1 is connected to the feed point 3 .
  • the printed circuit board 2 realizes signal transmission with the antenna 1 through the feed point 3.
  • the antenna 1 includes a first branch 11 and the antenna device further includes:
  • the end of the first branch 11 is connected to the first ground point 41 through the first switch 51; when the first switch 51 is closed, the end of the first branch 11 is connected to the first ground point 41, thereby making the first
  • the branch 11 forms a circular branch, and the antenna is equivalent to a loop antenna, and the end of the first branch 11 is the ground point of the Loop antenna; when the first switch 51 is disconnected, the end of the first branch 11 is suspended, thereby The antenna at the time is equivalent to a monopole antenna, and the end of the first branch 11 is the end of the Monopole antenna.
  • the closing and opening of the first switch 51 can switch the end of the first branch 11 of the antenna between grounding and floating, so that the antenna is switched between the Loop antenna and the Monopole antenna, and the first branch 11 is grounded and suspended.
  • Different states produce different resonant frequencies, which changes the resonant frequency of the antenna and increases the antenna bandwidth.
  • the antenna device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, no switching loss is introduced. The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.
  • the antenna 1 may further include a second branch 12, and the end of the second branch 12 is grounded, that is, the second branch 12 passes through the second ground point on the printed circuit board 2. 42 is connected to the printed circuit board 2 such that the second branch 12 forms an annular branch.
  • the other structures in the antenna device are the same as those in the first embodiment, and will not be described again.
  • the antenna is equivalent to a double loop antenna, and the end of the first branch 11 is a grounding point of the double loop antenna; when the first switch 51 is disconnected, the end of the first branch 11 is suspended, so that the antenna at this time is equivalent to a single branch Planar Inverted-F Antenna (PIFA) antenna, the end of the first branch 11 is the end of a single-section PIFA antenna.
  • PIFA Planar Inverted-F Antenna
  • the closing and opening of the first switch 51 causes the antenna to switch between the dual loop antenna and the single-node PIFA antenna, and the first branch 11 generates different resonant frequencies in the grounded and suspended states, thereby changing the resonant frequency of the antenna. , increased antenna bandwidth.
  • the antenna device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, no switching loss is introduced. The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.
  • the antenna 1 may further include a third branch 13 and the end of the third branch 13 is suspended.
  • Other structures of the antenna device are the same as those in the first embodiment, and are not described herein again.
  • the end of the first branch 11 is in communication with the first ground point 41.
  • the antenna is equivalent to a Loop+ high-frequency antenna
  • the end of the first branch 11 is a grounding point of the antenna
  • the first switch 51 is turned off, the end of the first branch 11 is suspended, so that the antenna at this time is equivalent to the Monopole antenna, and the end of the first branch 11 is one end of the Monopole antenna.
  • the closing and opening of the first switch 51 causes the antenna to switch between the Loop+ high frequency antenna and the Monopole antenna.
  • the first branch 11 generates different resonant frequencies in the grounded and suspended states, thereby changing the resonant frequency of the antenna. , increased antenna bandwidth.
  • the antenna device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, no switching loss is introduced. The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.
  • the antenna 1 may further include a third branch 13 and the end of the third branch 13 is suspended.
  • the other structure of the antenna device is the same as that of the second embodiment, and is no longer Narration.
  • the antenna is equivalent to a double Loop+ high frequency branch antenna, and the end of the first branch 11 is a ground point of the double loop antenna;
  • the first switch 51 is turned off, the end of the first branch 11 is suspended, so that the antenna at this time is equivalent to a Planar Inverted-F Antenna (PIFA) antenna, and the end of the first branch 11 is a double-branch PIFA antenna.
  • PIFA Planar Inverted-F Antenna
  • the closing and opening of the first switch 51 causes the antenna to switch between the dual Loop+ high frequency branch antenna and the double branch PIFA antenna, changing the resonant frequency of the first branch 11, changing the resonant frequency of the antenna, and increasing the antenna. bandwidth.
  • the efficiency of the antenna device in this embodiment will be specifically described by taking the Long Term Evolution (LTE) antenna as an example by using the antenna structure in this embodiment.
  • the LTE antenna with the structure in this embodiment is dual low frequency, and needs to switch between two frequency bands of 824 ⁇ 894 MHz and 699 ⁇ 746 MHz.
  • the resonant frequency of the LTE antenna is 700 MHz
  • the resonant frequency of the LTE antenna is 850MHz.
  • the antenna efficiency of Figure 5 is obtained through actual test. It can be seen from the test results that the efficiency of the LTE antenna in the 699 ⁇ 770MHz band when the first switch is off is 50% or more.
  • the LTE antenna has an efficiency of more than 40% in the 770-900 MHz band, effectively covering the low-band bandwidth.
  • the closing and opening of the first switch has less influence on the high frequency band.
  • the antennas are switched between the two resonant frequencies of 700 MHz and 850 MHz as an example. It can be understood that the resonance of the antenna can be changed by changing the structure of the antenna, for example, changing the length of the branch.
  • the antenna device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, no switching loss is introduced. The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.
  • the antenna device may further include a second switch 52 and a second grounding point 42 disposed on the printed circuit board 2; the antenna 1 further includes a second branch 12; The end of the second branch 12 is connected to the second grounding point 42 through the second switch 52; when the second switch 52 is closed, the end of the second branch 12 is in communication with the second grounding point 42, so that the second branch 12 forms an annular branch; When the second switch 52 is turned off, the end of the second branch 12 is suspended.
  • Other structures of the antenna device are the same as those in the first embodiment, and are not described herein again.
  • the first switch is respectively disposed at the end of the first branch 11 and the end of the second branch 12
  • the antenna 51 and the second switch 52 are two switches, each of which has two states of closing and opening, so the antenna including the two switches has the following four states:
  • the first type, the first switch 51 and the second switch 52 are both closed, and the end of the first branch 11 and the end of the second branch 12 are grounded, and the antenna is equivalent to a double loop antenna;
  • the ends of 12 are suspended, and the antenna is equivalent to a Monopole antenna
  • the third type the first switch 51 is closed, the end of the first branch 11 is grounded, the second switch 52 is disconnected, and the end of the second branch 12 is suspended, and the antenna is equivalent to a single-section PIFA antenna;
  • the first switch 51 is disconnected, the end of the first branch 11 is suspended, the second switch 52 is closed, and the end of the second branch 12 is grounded, and the antenna is equivalent to a single-section PIFA antenna;
  • the four states include two single-node PIFA antennas, since the lengths of the two-section PIFA antennas are different, the antennas of the above four states have different resonant frequencies, so that Controlling the closing and opening of the first switch 51 and the second switch 52 to achieve any of these four states, that is, switching between two, three or four antenna resonant frequencies can be achieved, increasing the antenna bandwidth.
  • the antenna device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, no switching loss is introduced. The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.
  • the antenna may further include a third branch 13 and the end of the third branch 13 is suspended.
  • the other structure of the antenna device is the same as that of the fifth embodiment, and details are not described herein again.
  • the antenna can be switched in the following four states:
  • the first type, the first switch 51 and the second switch 52 are both closed, and the end of the first branch 11 and the end of the second branch 12 are grounded, and the antenna is equivalent to a double loop + high frequency antenna.
  • the ends of 12 are all suspended, and the antenna is equivalent to a Monopole antenna.
  • the third type the first switch 51 is closed, the end of the first branch 11 is grounded, the second switch 52 is disconnected, and the end of the second branch 12 is suspended, and the antenna is equivalent to the double-branch PIFA antenna.
  • the fourth, first switch 51 is disconnected, the end of the first branch 11 is suspended, the second switch 52 is closed, and the end of the second branch 12 is grounded, and the antenna is equivalent to a double-branch PIFA antenna.
  • the antenna resonance frequency of each state is different, and the switching frequency of two, three or four antennas can be realized, and the antenna bandwidth is increased.
  • the antenna device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, no switching loss is introduced. The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.
  • An embodiment of the present invention provides a terminal device, including any antenna device in any of the foregoing embodiments; a radio frequency module connected to a feed point on a printed circuit board of the antenna device; and a first switch or a first switch and a first antenna connected to the antenna device
  • the switch control module of the two switches The structure and principle of the specific antenna device are the same as those of the foregoing embodiment, and details are not described herein again.
  • the radio frequency module is configured to provide a transmitting signal to the antenna through the feeding point or obtain a signal received by the antenna through the feeding point
  • the switch control module is configured to control the closing and opening of the first switch, or control the closing and closing of the first switch and the second switch. Disconnected to achieve switching of the antenna between different resonant frequencies.
  • the antenna device in the first embodiment to the fourth embodiment only includes the first switch, so that the switch between the two resonant frequencies can be realized by controlling the closing and opening of the first switch by the switch control module;
  • the antenna device of the sixth embodiment includes a first switch and a second switch, so that a switch control module is required to connect the first switch and the second switch to control the two switches.
  • the antenna of the switch includes the following four states: a first switch and a second switch Both are closed, the first switch and the second switch are both open, the first switch is closed while the second switch is open, the first switch is open and the second switch is closed, and the antenna has different structures and resonances in these four states.
  • the frequency specifically referring to the fifth embodiment and the sixth embodiment, achieves switching of the antenna between a plurality of resonant frequencies.
  • the terminal device may be a mobile phone, a data card, a fixed station, or a tablet computer.
  • the terminal device in the embodiment of the present invention controls whether the end of the antenna branch is grounded by a switch disposed at the end of the antenna branch to switch the antenna to a different resonant frequency. Since the switch is disposed at the end of the antenna branch, switching loss is not introduced, so The antenna bandwidth is increased while avoiding the reduction of the antenna efficiency caused by the switching loss, and does not increase the occupied space of the antenna.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

本发明公开了一种天线装置和终端设备，涉及通信技术领域，通过设置在天线枝节末端的开关控制天线切换至不同的谐振频率，避免了开关损耗造成的天线效率降低且不会增加天线的占空空间。该天线装置包括天线和印刷电路板，所述印刷电路板上设置有馈点和第一接地点，所述天线连接于所述馈点，所述天线包括第一枝节，所述天线装置还包括：第一开关，所述第一枝节末端通过所述第一开关连接于所述第一接地点；当所述第一开关闭合时，所述第一枝节末端与所述第一接地点连通；当所述第一开关断开时，所述第一枝节末端悬空。终端设备，包括：上述的天线装置；连接于天线装置的射频模块；连接于天线装置的开关控制模块。

Description

天线装置和终端设备 技术领域
本发明涉及通信技术领域， 尤其涉及一种天线装置和终端设备。 背景技术
随着通信技术的发展， 手机等终端设备很多需要多频共存， 例如长期演进
( Long Term Evolution, LTE )频段的引入， 要求天线的带宽越来越大， 普通天 线在有限的空间内不能满足天线带宽的要求。 因此， 需要使用开关控制天线切 换至不同的谐振频率， 以增大天线的带宽。
然而， 目前的开关设置于天线线路中间， 会产生开关损耗， 从而使天线效 率降低， 而为了不降低天线效率使用不带开关的普通天线又会增加天线的占用 空间。 发明内容
本发明提供一种天线装置和终端设备， 通过设置在天线枝节末端的开关控 制天线切换至不同的谐振频率， 避免了开关损耗造成的天线效率降低且不会增 加天线的占空空间。
为解决上述技术问题， 本发明釆用如下技术方案：
一方面， 本发明提供一种天线装置， 包括天线和印刷电路板， 所述印刷电 路板上设置有馈点和第一接地点， 所述天线连接于所述馈点， 所述天线包括第 一枝节， 所述天线装置还包括：
第一开关， 所述第一枝节末端通过所述第一开关连接于所述第一接地点； 当所述第一开关闭合时， 所述第一枝节末端与所述第一接地点连通； 当所述第一开关断开时， 所述第一枝节末端悬空。
进一步地， 所述天线还包括第二枝节， 所述第二枝节末端接地。
进一步地， 所述天线还包括第三枝节， 所述第三枝节末端悬空。
进一步地， 所述天线装置， 还包括：
第二开关和设置于所述印刷电路板上的第二接地点； 所述天线还包括第二枝节；
所述第二枝节末端通过所述第二开关连接于所述第二接地点；
当所述第二开关闭合时， 所述第二枝节末端与所述第二接地点连通； 当所述第二开关断开时， 所述第二枝节末端悬空。
进一步地， 所述天线还包括第三枝节， 所述第三枝节末端悬空。
另一方面， 本发明还提供一种终端设备， 包括：
上述的天线装置；
连接于所述天线装置中印刷电路板上馈点的射频模块；
连接于所述天线装置中第一开关或第一开关和第二开关的开关控制模块。 进一步地， 所述终端设备为手机、 数据卡、 固定台或平板电脑。
本发明实施例中的天线装置和终端设备， 通过设置在天线枝节末端的开关 控制天线枝节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置 于天线枝节的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开 关损耗造成的天线效率降低， 并且不会增加天线的占用空间。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实施 例或现有技术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 中的附图仅仅是本发明的一些实施例， 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他的附图。
图 1为本发明实施例中一种天线装置的结构示意图；
图 2为本发明实施例中另一种天线装置的结构示意图；
图 3为本发明实施例中另一种天线装置的结构示意图；
图 4为本发明实施例中另一种天线装置的结构示意图；
图 5为本发明实施例中一种天线效率示意图；
图 6为本发明实施例中另一种天线装置的结构示意图；
图 7为本发明实施例中另一种天线装置的结构示意图。 具体实施方式 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
实施例一
如图 1所示，本发明实施例提供一种天线装置，包括天线 1和印刷电路板 2 , 印刷电路板 2上设置有馈点 3和第一接地点 41 , 天线 1连接于馈点 3 , 印刷电 路板 2通过馈点 3实现与天线 1的信号传递， 天线 1包括第一枝节 11 , 天线装 置还包括：
第一开关 51 , 第一枝节 11末端通过第一开关 51连接于第一接地点 41 ; 当 第一开关 51闭合时， 第一枝节 11末端与第一接地点 41连通， 从而使第一枝节 11形成环形枝节， 此时天线相当于环形（Loop )天线， 第一枝节 11末端为 Loop 天线的接地点； 当第一开关 51断开时， 第一枝节 11末端悬空， 从而此时的天 线相当于单极子（Monopole )天线， 第一枝节 11末端为 Monopole天线的末端。
具体地， 第一开关 51 的闭合和断开可以使天线第一枝节 11末端在接地与 悬空之间转换， 使天线在 Loop天线和 Monopole天线之间转换， 第一枝节 11在 接地与悬空两种状态时产生不同的谐振频率， 从而改变了天线的谐振频率， 增 大了天线带宽。
本发明实施例中的天线装置， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
实施例二
如图 2所示， 进一步地， 在实施例一的基础上， 天线 1还可以包括第二枝 节 12, 第二枝节 12末端接地， 即第二枝节 12通过印刷电路板 2上的第二接地 点 42连接于印刷电路板 2 ,使第二枝节 12形成环形枝节。 天线装置中的其他结 构与实施例一相同， 在此不再赘述。
具体地， 当第一开关 51闭合时， 第一枝节 11末端与第一接地点 41连通， 此时天线相当于双 Loop天线， 第一枝节 11末端为双 Loop天线的一个接地点； 当第一开关 51 断开时， 第一枝节 11末端悬空， 从而此时的天线相当于单枝节 平面倒 F ( Planar Inverted-F Antenna, PIFA )天线， 第一枝节 11末端为单枝节 PIFA天线的末端。 第一开关 51 的闭合和断开使天线在双 Loop天线和单枝节 PIFA天线之间转换， 第一枝节 11 在接地与悬空两种状态时产生不同的谐振频 率， 从而改变了天线的谐振频率， 增大了天线带宽。
本发明实施例中的天线装置， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
实施例三
如图 3所示， 进一步地， 在实施例一的基础上， 天线 1还可以包括第三枝 节 13 , 第三枝节 13末端悬空。 天线装置的其他结构与实施例一相同， 在此不再 赘述。
具体地， 当第一开关 51闭合时， 第一枝节 11末端与第一接地点 41连通， 此时天线相当于 Loop+高频枝节天线， 第一枝节 11末端为天线的一个接地点； 当第一开关 51断开时，第一枝节 11末端悬空，从而此时的天线相当于 Monopole 天线， 第一枝节 11末端为 Monopole天线的一个末端。 第一开关 51的闭合和断 开使天线在 Loop+高频枝节天线和 Monopole天线之间转换， 第一枝节 11在接 地与悬空两种状态时产生不同的谐振频率， 从而改变了天线的谐振频率， 增大 了天线带宽。
本发明实施例中的天线装置， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
实施例四
如图 4所示， 进一步地， 在实施例二的基础上， 天线 1还可以包括第三枝 节 13 , 第三枝节 13末端悬空。 天线装置的其他结构与实施例二相同， 在此不再 赘述。
当第一开关 51闭合时， 第一枝节 11末端与第一接地点 41连通， 此时天线 相当于双 Loop+高频枝节天线， 第一枝节 11末端为双 Loop天线的一个接地点； 当第一开关 51 断开时， 第一枝节 11末端悬空， 从而此时的天线相当于双枝节 平面倒 F ( Planar Inverted-F Antenna, PIFA )天线， 第一枝节 11末端为双枝节 PIFA天线的一个末端。第一开关 51的闭合和断开使天线在双 Loop+高频枝节天 线和双枝节 PIFA天线之间转换， 改变了第一枝节 11 的谐振频率， 同时改变了 天线的谐振频率， 增大了天线带宽。
以下通过釆用本实施例中的天线结构来实现长期演进 （Long Term Evolution, LTE )天线为例具体说明本实施例中天线装置的效率。 釆用本实施例 中结构的 LTE天线为双低频， 需要实现 824 ~ 894MHz和 699 ~ 746MHz两个频 段的切换， 具体地， 当第一开关断开时， LTE天线的谐振频率为 700MHz, 当第 一开关闭合时， LTE天线的谐振频率为 850MHz,通过实际测试得到图 5的天线 效率示意图，由测试结果可以看出，第一开关断开时的 LTE天线在 699 ~ 770MHz 频段效率为 50%以上，第一开关闭合时的 LTE天线在 770 ~ 900MHz频段效率为 40%以上，有效的覆盖了低频段带宽。 另外可以看出第一开关的闭合和断开对于 高频段的影响较小。
需要说明的是， 本实施例中仅以天线在 700MHz和 850MHz两个谐振频率 切换为例进行说明， 可以理解的是， 通过改变天线的结构， 例如改变枝节的长 度等方式即可以改变天线的谐振频率， 从而通过上述第一开关的闭合和断开来 实现其他谐振频率的切换， 并且不限于实现双低频， 例如也可以现实双高频。
本发明实施例中的天线装置， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
实施例五
如图 6 所示， 进一步地， 在实施例一的基础上， 天线装置还可以包括第二 开关 52和设置于印刷电路板 2上的第二接地点 42; 天线 1还包括第二枝节 12; 第二枝节 12末端通过第二开关 52连接于第二接地点 42;当第二开关 52闭合时， 第二枝节 12末端与第二接地点 42连通， 从而使第二枝节 12形成环形枝节； 当 第二开关 52断开时， 第二枝节 12末端悬空。 天线装置的其他结构与实施例一 相同， 在此不再赘述。
具体地， 由于在第一枝节 11末端和第二枝节 12末端分别设置了第一开关
51和第二开关 52两个开关，每个开关都具有闭合和断开两种状态， 因此包括两 个开关的天线一共具有以下四种状态：
第一种、 第一开关 51和第二开关 52都闭合， 第一枝节 11末端和第二枝节 12末端都接地， 此时天线相当于双 Loop天线；
第二种、 第一开关 51和第二开关 52都断开， 第一枝节 11末端和第二枝节
12末端都悬空， 此时天线相当于 Monopole天线；
第三种、 第一开关 51闭合， 第一枝节 11末端接地， 第二开关 52断开， 第 二枝节 12末端悬空， 此时天线相当于单枝节 PIFA天线；
第四种、 第一开关 51断开， 第一枝节 11末端悬空， 第二开关 52闭合， 第 二枝节 12末端接地， 此时天线相当于单枝节 PIFA天线；
需要说明的是， 虽然这四种状态中包括两种单枝节 PIFA天线， 但是由于这 两种单枝节 PIFA天线的枝节长度不同， 因此以上四种状态的天线分别具有不同 的谐振频率， 从而可以通过控制第一开关 51和第二开关 52的闭合与断开来实 现这四种状态中的任意一种， 即能够实现两种、 三种或者四种天线谐振频率的 切换， 增大了天线带宽。
本发明实施例中的天线装置， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
实施例六
如图 7 所示， 进一步地， 在实施例五的基础上， 天线还可以包括第三枝节 13 , 第三枝节 13末端悬空。 天线装置的其他结构与实施例五相同， 在此不再赘 述。 类似地， 通过控制第一开关 51和第二开关 52的闭合和断开， 可以使天线 在以下四种状态下转换：
第一种、 第一开关 51和第二开关 52都闭合， 第一枝节 11末端和第二枝节 12末端都接地 , 此时天线相当于双 Loop+高频枝节天线。
第二种、 第一开关 51和第二开关 52都断开， 第一枝节 11末端和第二枝节
12末端都悬空， 此时天线相当于 Monopole天线。
第三种、 第一开关 51闭合， 第一枝节 11末端接地， 第二开关 52断开， 第 二枝节 12末端悬空， 此时天线相当于双枝节 PIFA天线。
第四种、 第一开关 51断开， 第一枝节 11末端悬空， 第二开关 52闭合， 第 二枝节 12末端接地， 此时天线相当于双枝节 PIFA天线。
与实施例五类似， 这四种状态中， 每种状态的天线谐振频率都不同， 能够 实现两种、 三种或者四种天线谐振频率的切换， 增大了天线带宽。
本发明实施例中的天线装置， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
实施例七
本发明实施例提供一种终端设备， 包括上述各实施例中任意的天线装置； 连接于天线装置中印刷电路板上馈点的射频模块； 连接于天线装置中第一开关 或第一开关和第二开关的开关控制模块。 具体的天线装置结构和原理与上述实 施例相同， 在此不再赘述。 射频模块用于通过馈点为天线提供发射信号或者通 过馈点获得天线接收到的信号 , 开关控制模块用于控制第一开关的闭合与断开， 或者控制第一开关和第二开关的闭合与断开， 从而实现天线在不同谐振频率之 间的切换。 具体地， 实施例一至实施例四中的天线装置只包括第一开关， 因此 通过开关控制模块控制第一开关的闭合与断开即可实现天线在两种谐振频率之 间的切换； 实施例五和实施例六中的天线装置均包括第一开关与第二开关， 因 此需要一个开关控制模块连接第一开关和第二开关两个开关， 以实现对这两个 开关的控制， 具有这两个开关的天线包括以下四种状态： 第一开关和第二开关 都闭合、 第一开关和第二开关都断开、 第一开关闭合同时第二开关断开、 第一 开关断开同时第二开关闭合， 在这四种状态下天线具有不同的结构和谐振频率， 具体参照实施例五和实施例六， 从而实现了天线在多种谐振频率之间的切换。
具体地， 上述终端设备可以为手机、 数据卡、 固定台或平板电脑等。
本发明实施例中的终端设备， 通过设置在天线枝节末端的开关控制天线枝 节末端是否接地， 以使天线切换至不同的谐振频率， 由于开关设置于天线枝节 的末端， 不会引入开关损耗， 因此在增大天线带宽的同时避免了开关损耗造成 的天线效率降低， 并且不会增加天线的占用空间。
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。

Claims

权 利 要 求 书
1、 一种天线装置， 包括天线和印刷电路板， 所述印刷电路板上设置有馈 点和第一接地点， 所述天线连接于所述馈点， 所述天线包括第一枝节， 其特 征在于， 所述天线装置还包括：
第一开关，所述第一枝节末端通过所述第一开关连接于所述第一接地点； 当所述第一开关闭合时， 所述第一枝节末端与所述第一接地点连通； 当所述第一开关断开时， 所述第一枝节末端悬空。
2、 根据权利要求 1所述的天线装置， 其特征在于，
所述天线还包括第二枝节， 所述第二枝节末端接地。
3、 根据权利要求 1或 2所述的天线装置， 其特征在于，
所述天线还包括第三枝节， 所述第三枝节末端悬空。
4、 根据权利要求 1所述的天线装置， 其特征在于， 还包括：
第二开关和设置于所述印刷电路板上的第二接地点；
所述天线还包括第二枝节；
所述第二枝节末端通过所述第二开关连接于所述第二接地点；
当所述第二开关闭合时， 所述第二枝节末端与所述第二接地点连通； 当所述第二开关断开时， 所述第二枝节末端悬空。
5、 根据权利要求 4所述的天线装置， 其特征在于，
所述天线还包括第三枝节， 所述第三枝节末端悬空。
6、 一种终端设备， 其特征在于， 包括：
如权利要求 1至 5中任意一项所述的天线装置；
连接于所述天线装置中印刷电路板上馈点的射频模块；
连接于所述天线装置中第一开关或第一开关和第二开关的开关控制模 块。
7、 根据权利要求 6所述的天线装置， 其特征在于，
所述终端设备为手机、 数据卡、 固定台或平板电脑。
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EP2942834A1 (en) 2015-11-11
CN103972656A (zh) 2014-08-06

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