WO2017000336A1 - 一种天线及具有该天线的移动终端 - Google Patents

一种天线及具有该天线的移动终端 Download PDF

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Publication number
WO2017000336A1
WO2017000336A1 PCT/CN2015/085273 CN2015085273W WO2017000336A1 WO 2017000336 A1 WO2017000336 A1 WO 2017000336A1 CN 2015085273 W CN2015085273 W CN 2015085273W WO 2017000336 A1 WO2017000336 A1 WO 2017000336A1
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Prior art keywords
frame
antenna
metal
metal frame
main ground
Prior art date
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Ceased
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PCT/CN2015/085273
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English (en)
French (fr)
Inventor
李克
王吉钊
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Application filed by Yulong Computer Telecommunication Scientific Shenzhen Co Ltd filed Critical Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
Publication of WO2017000336A1 publication Critical patent/WO2017000336A1/zh
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Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to an electronic device, and more particularly to an antenna and a mobile terminal having the same.
  • the metal middle frame of the terminal is closed loop without breakpoint.
  • the existing published use of the mobile terminal with no breakpoints in the frame is often a ring or slot antenna. Although it satisfies the requirement of no breakpoint in the appearance of the metal frame, it only utilizes the simple implementation of the slot antenna, that is, in the metal.
  • the middle frame is opened at intervals, which is mainly due to its relatively complicated feed structure design and inflexible antenna resonance frequency adjustment (changing the gap size), and the radiation performance of the slot antenna is relatively weak, and the middle frame
  • the design of the gap around the circumference will also have a significant weakening effect on the structural strength of the whole machine.
  • the antenna design in the prior art all has the requirement of effectively failing to support the high performance requirements of the antenna of the future mobile terminal and the simple realization of the design. How to flexibly realize the antenna design and tuning in the closed-loop non-breakpoint metal middle frame mobile terminal, satisfying The need for appearance and antenna performance of future mobile terminals is a problem to be solved by the present invention.
  • the technical problem to be solved by the present invention is to provide an antenna and a mobile terminal having the same, which can realize metal frame sealing without end points, improve structural strength, and can meet antenna performance requirements.
  • an embodiment of the present invention provides an antenna including a main ground, a metal frame, and a metal trace for adjusting a resonant frequency of the antenna; the metal frame is closed without a breakpoint. a frame shape, the main ground and the metal trace are both located in the metal frame, the main ground is electrically connected to the metal frame, and the main ground and the inner side of the metal frame are separated a wire space, the metal trace is disposed in the trace space, the metal trace includes a tuning arm and a feed arm, the tuning arm is connected to the metal frame, and the feed arm is simultaneously connected to the The metal frame and the main ground.
  • the two sides of the main ground are in close contact with the inner surface of the metal frame.
  • the metal frame includes two side frames connected in a frame shape, a top frame and a bottom frame; the top frame The two ends are respectively connected to the top ends of the two side frames, and the two ends of the bottom frame are respectively connected to the bottom ends of the two side frames;
  • the wiring space is formed between the bottom frame and a bottom edge of the main ground.
  • tuning arm is connected to the bottom frame.
  • feed arm is connected to the bottom frame.
  • the feed arm is connected to a bottom edge of the main ground.
  • a gap is disposed between the top edge of the main ground and the top frame.
  • the main ground is a metal plate or a PCB board.
  • the present invention provides a mobile terminal having the aforementioned antenna, the outer surface of the metal frame of the antenna being exposed outside the mobile terminal.
  • the main ground of the antenna is an internal structural metal plate of the mobile terminal.
  • the antenna provided by the present invention and the mobile terminal having the same are used as the main radiator of the antenna because the metal frame and the main ground are electrically connected, and the resonant frequency of the antenna is adjusted by using metal traces to cover the corresponding frequency band, and the The radiation method can make the metal frame closed without break points, thereby ensuring the structural strength, and at the same time ensuring the appearance of the mobile terminal.
  • FIG. 1 is a schematic structural diagram of an antenna according to a preferred embodiment of the present invention.
  • Figure 2 is a schematic structural view of the bottom of the antenna of Figure 1;
  • FIG. 3 is a corresponding return loss parameter diagram of the antenna of FIG. 1;
  • FIG. 4 is a surface current distribution diagram of the antenna of FIG. 1 corresponding to low frequency 1;
  • Figure 5 is a surface current distribution diagram of the antenna of Figure 1 corresponding to high frequency 1;
  • Figure 6 is a surface current distribution diagram of the antenna of Figure 1 corresponding to high frequency 2;
  • FIG. 7 is a surface current distribution diagram of the antenna of FIG. 1 corresponding to the high frequency 3.
  • the mobile terminal provided by the preferred embodiment of the present invention may be a terminal device capable of wireless communication, such as a mobile phone, a tablet computer, or a PDA.
  • the mobile terminal has an antenna 10 with which a wireless communication function can be realized.
  • the antenna 10 includes a main ground 1, a metal frame 2, and a metal trace 3 for adjusting the resonant frequency of the antenna 10.
  • the metal frame 3 is a closed frame shape, and the main ground 1 and the metal trace 3 are both located in the metal frame 2, and the main ground 1 is electrically connected to the metal frame 2 through the main ground.
  • the electrical connection between the metal frame 2 and the metal frame 2 allows the metal frame 2 to also form part of the main ground 1 of the mobile terminal.
  • the metal trace 3 is disposed in the trace space, and the metal trace 3 includes a tuning arm 31 and a feed arm 32.
  • the tuning arm 31 is connected to the metal frame 2 so that the two structures are connected and electrically connected.
  • the feeding arm 32 is simultaneously connected to the metal frame 2 and the main ground 1 such that the feeding arm 32 is simultaneously connected to the metal frame 2 and the main ground 1 structure and electrically connected.
  • a feed point can be formed at the junction between the feed arm 32 and the main ground 1.
  • the resonant frequency of the antenna 10 can be adjusted by the cooperation of the different shapes and sizes between the tuning arm 31 and the feeding arm 32.
  • the metal frame 2 serves as a main antenna 10 radiator, and the resonance frequency is adjusted by changing the size and shape of the metal trace 3. Since the metal frame 2 and the main ground 1 are electrically connected, the metal frame 2 can be made a part of the overall main ground of the mobile terminal, and the metal frame 2 electrically connected to the main ground is used as the main radiator of the antenna 10 system, and the metal trace 3 is used. The resonant frequency of the antenna 10 is adjusted to cover the corresponding frequency band. With this radiation method, the metal frame 2 can be closed without breaks.
  • the outer surface of the metal frame 2 is exposed outside the mobile terminal, that is, the metal frame 2 can be used as a part of the mobile terminal housing, for example, as a middle frame housing of the mobile terminal.
  • the metal frame 2 is closed without break points, which can ensure the structural strength and ensure the appearance of the mobile terminal.
  • the main ground 1 is a metal plate to facilitate the connection between the main ground 1 and the metal frame 2.
  • the metal plate can serve as an internal structural metal plate of the mobile terminal.
  • the primary ground 1 may also be a PCB board or other structural member within the mobile terminal.
  • the physical structure between the main ground 1 and the metal frame 2 is directly connected. More specifically, the two sides of the main ground 1 are attached to the inner surface of the metal frame 2, so that the main ground 1 and the metal frame 2 are physically connected, so that the connection is firm and reliable; and the main ground 1 and the metal can be made at the same time.
  • the electrical conduction between the blocks 2 facilitates the use of the metal frame 2 to radiate. Since the main ground 1 is an internal structural metal plate of the mobile terminal, the metal frame 2 is a part of the mobile terminal casing, and the structural connection between the two can improve the structural strength of the mobile terminal as a whole.
  • the main ground 1 may be connected to the metal frame 2 only by one side, or the electrical connection between the main ground 1 and the metal frame 2 may be electrically connected through a wire, an FPC or the like.
  • the metal frame 2 includes two side frames 21 connected in a frame shape, a top frame 22 and a bottom frame 23; two ends of the top frame 22 are respectively connected to the top ends of the two side frames 21, the bottom Both ends of the frame 23 are connected to the bottom ends of the two side frames 21, respectively.
  • the entire metal frame 2 is frame-shaped to match the shape of the mobile terminal.
  • the connection between the side frame 21 and the top frame 22, and the connection between the side frame 21 and the bottom frame 23 can be rounded so that the four corners of the mobile terminal are circular, so that the mobile terminal has a beautiful appearance. .
  • the main ground 1 may be square or substantially square so that the shape of the main ground 1 matches the shape of the metal frame 2 to facilitate the connection between the main ground 1 and the metal frame 2.
  • the two sides of the main ground 1 are fixedly connected to the inner surfaces of the side frames 21, respectively.
  • a gap is provided between the top edge of the main ground 1 and the top frame 22, and the space between the top edge of the main ground 1 and the top frame 22 can facilitate the installation of components such as an earpiece.
  • the top edge of the main ground 1 may also be connected to the top frame 22, and the two may also be seamlessly connected.
  • the wiring space is formed between the bottom frame 23 and the bottom edge of the main ground 1.
  • the metal trace 3 is disposed in the wiring space, so that the metal trace 3 is located at the bottom of the mobile terminal, and when the hand is held, the influence of the hand on the signal of the antenna 10 can be reduced, and the head of the user can be reduced when making a call.
  • the effect of the 10 signal is to reduce hand and head loss.
  • the tuning arm 31 is coupled to the bottom frame 23 such that the tuning arm 31 is coupled to the metal frame 2, and the tuning arm 31 is located at the bottom of the mobile terminal to reduce the influence of the user's hand on the signal of the antenna 10.
  • the tuning arm 31 may also be coupled to the bottom end of the side frame 21.
  • the feed arm 32 is connected to the bottom frame 23 such that the feed arm 32 is connected to the metal frame 2, and the feed arm 32 is located at the bottom of the mobile terminal, reducing the influence of the user's hand on the signal of the antenna 10.
  • the feed arm 32 may also be coupled to the bottom end of the side frame 21.
  • the feeding arm 32 is connected to the bottom edge of the main ground 1, so that the feeding arm 32 as a whole is located in the wiring space, facilitating the connection between the feeding arm 32 and the main ground 1.
  • the feed arm 32 may also be connected to other locations of the main ground 1, for example, the feed arm 32 may be connected to a position near the bottom edge of the main ground 1.
  • the tuning arm 31 and the feeding arm 32 are arranged in the left-right direction to facilitate the structural design of the tuning arm 31 and the feeding arm 32 to reduce the space occupied. Further, the tuning arm 31 and the feeding arm 32 are both flat and the two are on the same plane to facilitate the cooperation of the two with other components in the mobile terminal. Here, in other embodiments, the tuning arm 31 and the feeding arm 32 may also be arranged along the thickness direction of the mobile terminal.
  • the tuning arm 31 includes a first tuning arm 311, a second tuning arm 312, a third tuning arm 313, and a fourth tuning arm 314.
  • One end of the first tuning arm 311 is connected to the bottom frame 23 of the metal frame 2, and one end of the second tuning arm 312 and the third tuning arm 313 are connected to the other end of the first tuning arm 311, the first tuning branch
  • the arm 311 and the second tuning arm 312 are connected to the third tuning arm 313 in a T-shape, and the first tuning arm 311 is disposed perpendicular to the bottom frame 23.
  • the other end of the second tuning arm 312 is connected to one end of the fourth tuning arm 314, the second tuning arm 312 is connected to the fourth tuning arm 314 in a U-shape, and the fourth tuning arm 314 is located in the second tuning branch. Between the arm 312 and the bottom frame 23.
  • the feeding arm 32 includes a first feeding arm 321 and a second feeding arm 322.
  • the first feeding arm 321 is bent into a U shape, and one end of the first feeding arm 321 is bent and associated with the metal frame 2
  • the bottom frame 23 is connected, the other end of the first feed arm 321 is bent and connected to the main ground 1, and the other end of the first feed arm 32 is connected to one end of the second feed arm 322.
  • the tuning arm 31 and the feeding arm 32 can be formed into various shapes in order to cover a certain frequency band.
  • the number of the tuning arm 31 and the feeding arm 32 is not limited to one, the tuning arm may be two or more, and the feeding arm may be two or more.
  • the antenna 10 provided in this embodiment can work at low frequency and high frequency at the same time, and can cover several frequency bands by adjusting the size and shape of the metal trace 3, such as low frequency 1, low frequency 2, low frequency 3, high frequency 1, high frequency 2 and high. Frequency 3 and so on, these frequency bands can meet the performance requirements of various network standards for future mobile terminals.
  • FIG. 3 illustrates an S-parameter (return loss) corresponding to an operation mode formed by the metal trace 3 of the antenna 10 of the specific embodiment of the present invention, and the valley of the parameter trace corresponds to the low frequency from left to right respectively.
  • High frequency 1, high frequency 2 and high frequency 3 it can be seen that this mode of operation can simultaneously support low frequency 1, high frequency 1, high frequency 2 and high frequency 3.
  • the current distribution on both sides of the metal frame 2 is small, and the handheld mobile terminal (mainly holding the metal)
  • the hand loss of the mobile terminal using the antenna 10 of the present invention (the loss of the signal by the hand when holding the terminal) and the head loss (the head-to-head signal when the ear is called)
  • the loss is relatively small, and the losses of the left and right hands and the left and right heads are relatively balanced, which can well meet the demand for the improved performance of the antenna 10 in the future mobile terminal.
  • the metal frame serves as the main antenna radiator, and the metal trace adjusts the resonance frequency by changing the size and shape.
  • the built-in structure supporting metal plate is the main ground 1 of the mobile terminal, and the metal frame 2 and the built-in structural supporting metal plate are structurally connected and electrically connected, so the metal frame is also a part of the overall main ground of the mobile terminal, and the working principle of the antenna system is ground.
  • Radiation theory that is, the present invention proposes a new radiation theory, which uses a part of the main ground, that is, a metal frame, as the main radiator of the antenna system, and uses a metal trace to adjust the resonant frequency of the antenna.
  • the antenna provided in this embodiment meets the requirement of a high-performance antenna for a mobile terminal that does not have a breakpoint in the appearance of the metal frame.
  • the present invention provides an easily implementable antenna without a breakpoint metal frame, which can reduce the metal frame of the antenna system for the mobile terminal.
  • the structural requirements of no breakpoint greatly enhance the structural strength of the mobile terminal; the radiation performance of the antenna can be significantly improved by a simple feed structure design, and the resonant frequency can be adjusted very flexibly; the hand loss and head loss can be reduced, and the left hand and The loss of the right hand is relatively balanced.

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Abstract

本发明公开了一种天线，包括主地、金属框及调整天线谐振频率的金属走线；所述金属框为封闭无断点的框形，所述主地与所述金属走线均位于所述金属框中，所述主地与所述金属框电连接，且所述主地与所述金属框的内侧面之间有走线空间，所述金属走线设置在所述走线空间内，所述金属走线包括调谐臂与馈电臂，所述调谐臂与所述金属框连接，所述馈电臂同时连接于所述金属框及所述主地。由于金属框和主地电导通，金属框作为天线的主要辐射体，采用金属走线对天线谐振频率进行调整，以覆盖相应的频段，利用该辐射方式，可以使得金属框封闭无断点，从而保证其结构强度，同时还能保证移动终端的外形美观。本发明还公开了一种具有前述天线的移动终端。

Description

一种天线及具有该天线的移动终端 技术领域
本发明涉及电子设备，尤其涉及一种天线及具有该天线的移动终端。
背景技术
随着用户对移动终端外观的要求不断提高，越来越多金属外观的移动终端出现在市场上，但绝大数移动终端的金属中框都有塑胶隔断点，影响结构强度，只有极少数移动终端的金属中框是闭环无断点的。现有已经公布的使用在无断点中框移动终端上的往往都是环形或缝隙天线，虽然满足了外观金属中框无断点的需求，但仅利用了缝隙天线的简单实现，即在金属中框周圈开缝隙，这种实现主要受制于其比较复杂的馈电结构设计以及不够灵活的天线谐振频率调整(改变缝隙尺寸)，而且这种缝隙天线的辐射性能相对较弱，另外中框周圈开缝隙的设计对整机结构强度也会产生比较明显的弱化影响。
现有技术中的天线设计都存在着无法有效地支持未来移动终端的天线高性能需求以及设计简易实现的要求，如何在闭环无断点金属中框的移动终端中灵活实现天线设计和调谐，满足未来移动终端对于外观和天线性能的需求是本发明所要解决的问题。
发明内容
本发明所要解决的技术问题在于，提供一种天线及具有该天线的移动终端，其可以实现金属框封闭无端点，提高结构强度，且可满足天线性能需求。
为了解决上述技术问题，一方面，本发明的实施例提供了一种天线，其特征在于，包括主地、金属框及调整天线谐振频率的金属走线；所述金属框为封闭无断点的框形，所述主地与所述金属走线均位于所述金属框中，所述主地与所述金属框电连接，且所述主地与所述金属框的内侧面之间有走线空间，所述金属走线设置在所述走线空间内，所述金属走线包括调谐臂与馈电臂，所述调谐臂与所述金属框连接，所述馈电臂同时连接于所述金属框及所述主地。
其中，所述主地的两侧边与所述金属框的内表面贴合连接。
其中，所述金属框包括连接成框形两个侧框、一顶框及一底框；所述顶框 的两端分别连接至两个所述侧框的顶端，所述底框的两端分别连接至两个所述侧框的底端；
所述走线空间形成在所述底框与所述主地的底边之间。
其中，所述调谐臂连接与所述底框。
其中，所述馈电臂连接至所述底框。
其中，所述馈电臂连接至所述主地的底边处。
其中，所述主地的顶边与所述顶框之间设置有间隙。
其中，所述主地为金属板或PCB板。
另一方面，本发明提供了一种移动终端，所述移动终端具有前述的天线，所述天线的金属框的外表面露在所述移动终端外。
其中，所述天线的主地为所述移动终端的内部结构金属板。
本发明提供的天线及具有该天线的移动终端，由于金属框和主地电导通，金属框作为天线的主要辐射体，采用金属走线对天线谐振频率进行调整，以覆盖相应的频段，利用该辐射方式，可以使得金属框封闭无断点，从而保证其结构强度，同时还能保证移动终端的外形美观。
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性的前提下，还可以根据这些附图获得其他的附图。
图1是本发明优选实施例提供的天线的结构示意图；
图2是图1中天线底部的结构示意图；
图3是图1中天线的对应的回波损耗参数图；
图4是图1中天线对应低频1的表面电流分布图；
图5是图1中天线对应高频1的表面电流分布图；
图6是图1中天线对应高频2的表面电流分布图；
图7是图1中天线对应高频3的表面电流分布图。
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。
本发明中优选实施例提供的移动终端，该移动终端可以为手机、平板电脑、PDA等可进行无线通讯的终端设备。移动终端具有天线10，利用该天线10可以实现无线通讯功能。
请参见图1及图2，天线10包括主地1、金属框2及调整天线10谐振频率的金属走线3。金属框3为封闭无断点的框形，所述主地1与所述金属走线3均位于所述金属框2中，所述主地1与所述金属框2电连接，通过主地1与金属框2之间的电连接，可使得金属框2也可以形成移动终端的主地1的一部分。
所述主地1与所述金属框2的内侧面之间有走线空间。所述金属走线3设置在所述走线空间内，所述金属走线3包括调谐臂31与馈电臂32。所述调谐臂31与所述金属框2连接，以使二者结构相连且电导通。所述馈电臂32同时连接与所述金属框2及所述主地1，使得馈电臂32同时与所述金属框2及所述主地1结构相连且电导通。馈电臂32与主地1之间的连接处可以形成馈电点。利用调谐臂31与馈电臂32之间不同形状及尺寸的配合，可以调整天线10的谐振频率。
本实施例中，金属框2作为主要天线10辐射体，通过改变金属走线3尺寸和形状来调整谐振频率。由于金属框2和主地1电导通，故可以使得金属框2为移动终端整体主地的一部分，利用电导通与主地的金属框2作为天线10系统的主要辐射体，采用金属走线3对天线10谐振频率进行调整，以覆盖相应的频段。利用该辐射方式，可以使得金属框2封闭无断点。
金属框2的外表面露在移动终端外，即金属框2可以作为移动终端外壳的一部分，例如，可以作为移动终端的中框壳体。金属框2封闭无断点，可以保证其结构强度，同时还能保证移动终端的外形美观。
作为优选，主地1为金属板，以便于主地1与金属框2之间的连接。该金属板可以作为所述移动终端的内部结构金属板。此处，在其他的实施方式中，主地1也可以为移动终端内的PCB板或其他结构件。
主地1与金属框2之间物理结构直接连接。更具体地，主地1的两侧边与金属框2的内表面贴合连接，可以使得主地1与金属框2物理结构相连，使得二者连接牢固可靠；同时可以使得主地1与金属框2之间电导通，从而利于利用金属框2辐射。由于主地1为移动终端的内部结构金属板，金属框2为移动终端外壳的一部分，二者之间的结构连接可以提高移动终端整体的结构强度。当然，在其他实施方式中，主地1也可以仅一个侧边与金属框2相连，或者，主地1与金属框2之间也可以通过导线、FPC等电连接件使得二者电导通。
所述金属框2包括连接成框形两个侧框21、一顶框22及一底框23；所述顶框22的两端分别连接至两个所述侧框21的顶端，所述底框23的两端分别连接至两个所述侧框21的底端。整个金属框2为方框状，以与移动终端的外形相匹配。侧框21与顶框22的连接处、侧框21与底框23之间的连接处均可以设置倒圆角，以使得移动终端的四个边角为圆弧形，从而使得移动终端外形美观。
主地1可以为方形或者大致呈方形，以使的主地1的形状与金属框2的形状相匹配，便于主地1与金属框2之间的连接。本实施例中，主地1的两侧边分别与两侧框21的内表面固定连接。
所述主地1的顶边与所述顶框22之间设置有间隙，利用主地1的顶边与顶框22之间的空间可以便于设置听筒等零部件。当然，在其他的实施方式中，主地1的顶边也可以与顶框22之间连接，二者之间亦可以为无缝贴合连接。
所述走线空间形成在所述底框23与所述主地1的底边之间。金属走线3设置在走线空间，可以使得金属走线3位于移动终端的底部处，在手握时，可以降低手对天线10信号的影响，同时可以降低打电话时使用者头部对天线10信号的影响，即降低手损及头损。
所述调谐臂31连接与所述底框23，以使得调谐臂31与金属框2相连，调谐臂31位于移动终端的底部处，降低使用者手对天线10信号的影响。此处，在其他实施方式中，调谐臂31也可以连接至侧框21的底端处。
所述馈电臂32连接至所述底框23，以使得馈电臂32与金属框2相连，馈电臂32位于移动终端的底部处，降低使用者手对天线10信号的影响。此处，在其他实施方式中，馈电臂32也可以连接至侧框21的底端处。
所述馈电臂32连接至所述主地1的底边处，可以使得馈电臂32整体位于走线空间内，方便馈电臂32与主地1之间的连接。此处，在其他实施方式中，馈电臂32也可以连接至主地1的其他位置，例如，馈电臂32可以连接至靠近主地1底边的位置处。
本实施例中，调谐臂31与馈电臂32沿左右方向排布设置，以便于调谐臂31与馈电臂32的结构设计，减小占空空间。进一步，调谐臂31与馈电臂32均为平板状，且二者位于同一平面上，以便于二者与移动终端内其他部件的配合。此处，在其他实施方式中，调谐臂31与馈电臂32也可以沿移动终端的厚度方向排布设置。
调谐臂31包括第一调谐支臂311、第二调谐支臂312、第三调谐支臂313及第四调谐支臂314。第一调谐支臂311的一端与金属框2的底框23相连，第二调谐支臂312与第三调谐支臂313的一端均与第一调谐支臂311的另一端相连，第一调谐支臂311、第二调谐支臂312与第三调谐支臂313连接呈T型，第一调谐支臂311垂直于底框23设置。第二调谐支臂312的另一端与第四调谐支臂314的一端相连，第二调谐支臂312与第四调谐支臂314连接呈U型，且第四调谐支臂314位于第二调谐支臂312与底框23之间。
馈电臂32包括第一馈电支臂321及第二馈电支臂322，第一馈电支臂321弯折成U型，第一馈电支臂321的一端折弯并与金属框2的底框23相连，第一馈电支臂321的另一端折弯并与主地1相连，且第一馈电臂32的另一端与第二馈电支臂322的一端相连。
以上为本实施例提供的调谐臂31与馈电臂32的一种具体实施方式，当然，在其他实施方式中，为了覆盖某一频段，调谐臂31与馈电臂32可以做出多种形状及尺寸改变，调谐臂31与馈电臂32的数目也不局限于一个，调谐臂还可以为2个或更多个，馈电臂也可以为2个或更多个。
本实施例提供的天线10可以同时工作在低频和高频，通过调整金属走线3的尺寸和形状可以覆盖若干频段，如低频1、低频2、低频3、高频1、高频2和高频3等等，这些频段可以满足未来移动终端各种网络制式的性能需求。
图3阐述了本发明具体实施例的天线10的金属走线3形成的一种工作模式对应的S参数(回波损耗)，其参数走线的低谷处从左至右分别对应低频1、 高频1、高频2和高频3，由此可见该工作模式时可以同时支持低频1、高频1、高频2和高频3。
图4至图7分别阐述了本发明具体实施例的天线10的金属走线3形成的一种工作模式对应低频1、高频1、高频2和高频3的表面电流分布图。从表面电流分布来看，低频和高频的表面电流都主要分布在金属框2的底部和金属走线3上，金属框2两侧的电流分布较少，手持移动终端(主要是手握金属框2两侧)时对天线10性能影响较少，因此使用本发明的天线10的移动终端的手损(手握终端时人手对信号的损耗)和头损(贴耳打电话时人头对信号的损耗)都相对较小，而且左右手和左右头的损耗都比较均衡，可以很好地满足未来移动终端对天线10性能不断提高的需求。
本实施例中，金属框作为主要天线辐射体，金属走线通过改变尺寸和形状来调整谐振频率。内置结构支撑金属板是移动终端的主地1，金属框2和内置结构支撑金属板是结构相连且电导通的，所以金属框也是移动终端整体主地的一部分，该天线系统的工作原理是地辐射理论，即本发明提出一种新的辐射理论，利用部分主地即金属框作为天线系统的主要辐射体，采用金属走线对天线谐振频率进行调整的工作原理，
本实施例提供的天线，满足外观金属框无断点的移动终端对于高性能天线的需求，本发明提供了一种易于实现的无断点金属框的天线，能够降低天线系统对于移动终端金属框无断点的结构要求，大大地增强移动终端的结构强度；能够通过简单的馈电结构设计显著地提高天线的辐射性能，非常灵活的调整谐振频率；能够降低手损和头损，且左手和右手的损耗相对均衡。
以上所述的实施方式，并不构成对该技术方案保护范围的限定。任何在上述实施方式的精神和原则之内所作的修改、等同替换和改进等，均应包含在该技术方案的保护范围之内。

Claims (10)

  1. 一种天线，其特征在于，包括主地、金属框及调整天线谐振频率的金属走线；所述金属框为封闭无断点的框形，所述主地与所述金属走线均位于所述金属框中，所述主地与所述金属框电连接，且所述主地与所述金属框的内侧面之间有走线空间，所述金属走线设置在所述走线空间内，所述金属走线包括调谐臂与馈电臂，所述调谐臂与所述金属框连接，所述馈电臂同时连接于所述金属框及所述主地。
  2. 根据权利要求1所述的天线，其特征在于，所述主地的两侧边与所述金属框的内表面贴合连接。
  3. 根据权利要求1所述的天线，其特征在于，所述金属框包括连接成框形两个侧框、一顶框及一底框；所述顶框的两端分别连接至两个所述侧框的顶端，所述底框的两端分别连接至两个所述侧框的底端；
    所述走线空间形成在所述底框与所述主地的底边之间。
  4. 根据权利要求3所述的天线，其特征在于，所述调谐臂连接与所述底框。
  5. 根据权利要求3所述的天线，其特征在于，所述馈电臂连接至所述底框。
  6. 根据权利要求3所述的天线，其特征在于，所述馈电臂连接至所述主地的底边处。
  7. 根据权利要求3所述的天线，其特征在于，所述主地的顶边与所述顶框之间设置有间隙。
  8. 根据权利要求1-7任一项所述的天线，其特征在于，所述主地为金属板或PCB板。
  9. 一种移动终端，其特征在于，所述移动终端具有权利要求1至8任一项所述的天线，所述天线的金属框的外表面露在所述移动终端外。
  10. 根据权利要求9所述的移动终端，所述天线的主地为所述移动终端的内部结构金属板。
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