WO2016173485A1 - 缝隙天线及移动终端 - Google Patents

缝隙天线及移动终端 Download PDF

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Publication number
WO2016173485A1
WO2016173485A1 PCT/CN2016/080210 CN2016080210W WO2016173485A1 WO 2016173485 A1 WO2016173485 A1 WO 2016173485A1 CN 2016080210 W CN2016080210 W CN 2016080210W WO 2016173485 A1 WO2016173485 A1 WO 2016173485A1
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Prior art keywords
antenna
matching network
slot
metal frame
disposed
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PCT/CN2016/080210
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English (en)
French (fr)
Inventor
陈玉稳
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Publication date
Application filed by Vivo Mobile Communication Co Ltd filed Critical Vivo Mobile Communication Co Ltd
Publication of WO2016173485A1 publication Critical patent/WO2016173485A1/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas

Definitions

  • the present disclosure relates to the field of antenna technologies, and in particular, to a slot antenna and a mobile terminal.
  • the mobile terminal with the metal middle frame poses a great challenge to the antenna in terms of bandwidth and design complexity, especially in the case where the metal middle frame cannot be broken.
  • a topology of one feed point and one ground point can be used to generate a relatively good low frequency resonance, and in the high frequency band, multiple ground points are used, and the grounding position and the grounding of the low frequency topology are grounded.
  • the location is different.
  • the mobile terminal adopting this scheme adopts an extremely complicated grounding matching network.
  • a technical problem that needs to be urgently solved at present is how to simplify the structure of the slot antenna while taking into consideration the high and low frequency performance.
  • the technical problem to be solved by the embodiments of the present disclosure is to provide a slot antenna and a mobile terminal, which can simplify the structure of the slot antenna while taking into consideration high and low frequency performance.
  • a slot antenna including a metal block, a metal frame, at least two ground plates, and at least one set of antenna components, the antenna assembly including an antenna feed, Antenna unit, and at least two sets of matching networks,
  • the metal frame is disposed along an outer circumference of the metal block, and forms a gap with the metal block;
  • the at least two grounding strips are disposed in the gap to ground the metal frame and the metal block, and the at least two grounding strips are respectively disposed on the first side and the second side of the metal frame On the side, the first side edge is opposite to the second side edge;
  • the antenna assembly is disposed in the slot, wherein the antenna feed is disposed between the metal block and the antenna unit, and the matching network is disposed between the antenna unit and the metal frame.
  • a gap length between two adjacent grounding strips is adapted to the transverse mode and the longitudinal mode of the low frequency resonance.
  • the distance from the grounding strip to the third side is 50 mm to 100 mm, wherein the third side is located between the first side and the second side of the metal frame.
  • the at least two sets of matching networks include a first matching network and a second matching network, wherein the first matching network exhibits different equivalent values on two resonant frequencies of the low frequency.
  • the inductive component in the first matching network and the second matching network is a thin line integrated on the antenna unit.
  • the first matching network and the capacitive element in the second matching network are slot-coupled.
  • the second matching network is a slot coupling between the antenna unit and the third side, wherein the third side is located on the first side of the metal frame and the Between the second sides.
  • the second matching network is connected between the 1/4 to 1/2 portions of the third side.
  • the first matching network is connected to a connection between the first side and the third side.
  • a third matching network is further connected between the antenna unit and the metal block.
  • a fourth matching network is further connected between the metal frame and the metal block.
  • the embodiment of the present disclosure also discloses a mobile terminal in which the above slot antenna is disposed.
  • the embodiments of the present disclosure include the following advantages:
  • the slot antenna in the embodiment of the present disclosure has a simple structure, and is directly grounded by providing a grounding piece on both sides, thereby avoiding the signal passing through the grounding point and generating the upper antenna (such as a GPS antenna, a WIFI antenna, and a diversity antenna). Interference, and without complex ground matching, the matching loss is small, and the antenna assembly takes into account the low-frequency and high-frequency resonant modes through at least two sets of matching networks.
  • FIG. 1 is a schematic structural view of a slot antenna in an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of another slot antenna in the embodiment of the present disclosure.
  • 3 is an equivalent value curve of a first matching network in different frequency bands in an embodiment of the present disclosure
  • FIG. 4 is a circuit diagram of a first matching network in an embodiment of the present disclosure.
  • FIG. 5 is a circuit diagram of a second matching network in an embodiment of the present disclosure.
  • FIG. 6 is a diagram showing a return loss of a slot antenna in an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another slot antenna in the embodiment of the present disclosure.
  • the slot antenna includes a metal block 11, a metal frame 12, a ground plate 13, and an antenna assembly 14.
  • the metal block 11 may be a PCB or a screen metal bracket or a metal battery cover or the like.
  • the metal frame 12 is a continuous annular structure without a break point. Of course, the annular surface may be provided with a notch for mounting a card or inserting a connecting wire, which does not affect the continuity of the metal frame 12.
  • the metal frame 12 is disposed around the outer periphery of the metal block 11 and forms a slit 111 between the metal block 11.
  • the slit 111 may be filled with a non-conductive medium such as air or glass.
  • the grounding piece 13 is disposed in the slit 111 to ground the metal frame 12 and the metal block 11. Specifically, the grounding strips 13 are fixedly connected to the metal frame 12 and the metal frame 11, respectively. The grounding strips 13 are at least two and are respectively disposed on two opposite sides of the metal frame 12.
  • two grounding lugs 13 are disposed on the opposite first side 121 and second side 122 of the metal frame 12, respectively.
  • the two grounding lugs 13 divide the slit 111 into two U-shaped slits.
  • One of the U-shaped slits can be used to set the above antenna assembly, and the other U-shaped slit can be integrated with other antennas.
  • the antenna assembly 14 is disposed in the lower U-shaped slot in FIG. 1, and the upper U-shaped slot is integrated with other antennas, such as a GPS antenna, a WIFI antenna, and a diversity antenna.
  • the grounding strip 13 may also have multiple.
  • a third grounding strip may be disposed in the U-shaped slit of FIG. 1, but the grounding strip needs to be connected in series with a high-resistance low-pass filter. The effect of the third grounding piece on the low frequency is reduced, and the high frequency performance is improved by the influence of the third grounding piece.
  • the length of the gap between two adjacent grounding strips can be set to fit the transverse mode and the longitudinal mode of the low frequency resonance to facilitate low frequency double harmonics. Vibration.
  • the antenna assembly 14 is disposed in the slot 111. If the grounding plate 13 is disposed as in Fig. 1, the antenna assembly 14 is disposed at the bottom of the lower U-shaped slot.
  • the antenna assembly 14 can have multiple sets.
  • the antenna assembly 14 is coupled between the metal block 11 and the metal frame 12, the antenna assembly 14 including an antenna feed, an antenna unit, and a matching network.
  • the antenna feed is disposed between the metal block 11 and the antenna unit
  • the matching network is disposed between the antenna unit and the metal frame 12.
  • the antenna assembly 14 enables the slot antenna to simultaneously satisfy low frequency requirements such as 824-960 MHz and high frequencies such as 1710-2690 MHz.
  • the slot antenna in the embodiment of the present disclosure has a simple structure, and is directly grounded by providing a grounding piece on both sides, thereby avoiding the signal passing through the grounding point and generating the upper antenna (such as a GPS antenna, a WIFI antenna, and a diversity antenna). Interference, and without complex ground matching, the matching loss is small, and the antenna assembly takes into account the low-frequency and high-frequency resonant modes through at least two sets of matching networks.
  • the slot antenna includes a metal block 21, a metal frame 22, two grounding plates 23, 24, and an antenna assembly, wherein the antenna assembly includes an antenna feed 25 and an antenna unit 26 And a matching network having two groups, a first matching network 27 and a second matching network 28, respectively.
  • more matching networks may be added between the antenna unit 26 and the metal frame 22 for better antenna performance, and more matching networks may be added between the antenna unit 26 and the metal block 21, It only increases the complexity of the slot antenna.
  • the metal block 21 and the metal frame 22 are similar to the metal block 11 and the metal frame 12 in the foregoing embodiments, respectively, and are not described herein again.
  • the metal frame 22 is disposed around the outer periphery of the metal block 21, and a gap 211 is formed between the metal block 21 and the metal block 21.
  • the metal frame 22 is rectangular and has a first side 221, a second side 222, and a third side 223.
  • the first side 221 is opposite to the second side 222
  • the third side 223 is located between the first side 221 and the second side 222 , and specifically may be the bottom side of the metal frame 22 .
  • the grounding lugs 23, 24 are disposed in the slit 211 to ground the metal block 21 and the metal frame 22.
  • the grounding strip 23 is disposed on the first side 221, and the grounding strip 24 is disposed on the second side 222.
  • the two grounding strips 23, 24 divide the slit 211 into two U-shaped slits, and the gap between the two grounding strips 23, 24.
  • the length is just right for the low frequency double resonance mode, including the transverse mode and the longitudinal mode.
  • the distance between the grounding strips 23 and 24 from the third side 223 may be about 50-100 mm.
  • the distance between the grounding strip 23 and the third side 223 may be 90 mm, and the distance between the grounding strip 24 and the third side 223. It is 100mm. of course, The distance can be adjusted according to factors such as the size of the machine, the width of the slit, the medium filled in the gap, and the like.
  • the antenna assembly is disposed in the slot 211, wherein the antenna feed 25 is disposed between the metal block 21 and the antenna unit 26, and the first matching network 27 and the second matching network 28 are both disposed between the antenna unit 26 and the metal frame 22.
  • a suitable antenna unit and a matching network can be designed, and several modes obtained by the simulation can be simultaneously excited, so that the slot antenna simultaneously satisfies the low frequency.
  • a suitable antenna unit and a matching network can be designed, and several modes obtained by the simulation can be simultaneously excited, so that the slot antenna simultaneously satisfies the low frequency.
  • 824-960MHz, high frequency such as 1710-2690MHz demand.
  • the low frequency and high frequency resonance modes generated by the simulation can be known:
  • the 827 MHz mode is lateral excitation, and a suitable first matching network 27 can be designed such that the incoming energy of the antenna feed 25 can reach the metal frame 22 through the first matching network 27 at 827 MHz, while the second matching network 28 is compared at 827 MHz. By blocking the passage of energy, a resonant mode of 827 MHz can be excited.
  • the 957 MHz mode is a longitudinal excitation, and a suitable first matching network 27 is designed such that the incoming energy of the antenna feed 25 can be more evenly distributed to the first matching network 27 and the second matching network 28 at 957 MHz, thereby exciting the metal frame.
  • the resonant mode of 957MHz can be excited.
  • the low frequency of the slot antenna exhibits double resonance, thereby achieving the purpose of expanding the bandwidth.
  • the equivalent value of the first matching network 27 in different frequency bands the first matching network 27 exhibits an equivalent value of a large inductance and a small capacitance at the first resonant frequency of the low frequency band.
  • the equivalent value of the second resonant frequency of the low frequency band is a small inductance and a large capacitance.
  • the various modes of the high frequency can also be simultaneously excited by the appropriate first matching network 27 and the second matching network 28.
  • the third side 223 of the metal frame 22, that is, the 1/4 to 1/2 portion of the bottom side is always the part with the stronger electric field, so the second optimization is performed in this interval.
  • the position and matching value of the matching network 28 is such that the second matching network 28 is connected between the 1/4 and 1/2 portions of the third side 223 to achieve better high frequency performance.
  • the inductive components in the first matching network 27 and the second matching network 28 may be integrated.
  • the capacitive elements may be slot coupled.
  • the first matching network 27 may be composed of an inductive element and a capacitive element as shown in FIG. 4, and the first matching network 27 is connected to the junction of the first side 221 and the third side 223, as shown in FIG.
  • the second matching network 28, as shown in FIG. 5, can be directly simplified to the slot coupling between the antenna unit 26 and the third side 223, and as shown in FIG. 2, the second matching network 28 is connected to the third side 223. Between 1/4 and 1/2 parts.
  • the antenna feed 25 can be moved right and left to achieve better results.
  • the return loss diagram of the slot antenna in the above example can significantly generate double resonance at low frequencies, and the high frequency bandwidth is also good.
  • a third matching network 71 may be connected between the antenna unit 26 and the metal block 21, and the metal frame 22 and the metal block 21 may be connected.
  • a fourth matching network 72 wherein the third matching network 71 can adjust the high frequency bandwidth better, and the fourth matching network 72 can make the antenna unit 26 more flexible.
  • the slot antenna in the embodiment of the present disclosure has a simple structure, and is directly grounded by providing two grounding plates on both sides, thereby avoiding not only the signal passing through the grounding point but also the upper antenna (such as a GPS antenna, a WIFI antenna, and a diversity antenna).
  • the interference occurs, and the antenna component realizes low-frequency double resonance through two sets of matching networks, expands the bandwidth, and realizes the high-frequency resonance mode, which reduces the absorption of signals by the human hand.
  • the U-shaped portion of the metal frame corresponding to the other integrated antennas may have a break point to make other antennas perform better, and the U-shaped portion corresponding to the antenna assembly is continuous without breakpoints; or
  • the metal frame may not be a complete ring frame, and may be a semi-annular frame.
  • the metal frame is continuous without break points.
  • the metal frame is disposed along the outer periphery of the metal block and forms a U-shaped slit with the metal frame.
  • the U-shaped slit An antenna assembly is provided inside. That is, the metal frame is only continuous without a break point near the set position of the antenna assembly.
  • the shape of the antenna unit can be flexible, such as a strip shape, a U shape, an S shape, and the like.
  • Devices such as USB or speakers, microphones, etc. can also be placed in the lower end slot area of the mobile terminal.
  • the embodiment of the present disclosure further discloses a mobile terminal, which includes the slot antenna in the above embodiment.
  • a mobile terminal which includes the slot antenna in the above embodiment.
  • the slot antenna For the specific structure of the slot antenna, refer to the description of the foregoing embodiment, and details are not described herein again.
  • the shapes and structures of the respective members are merely examples and are not limited.
  • the above components may be replaced by other components having the same function, and combined to form more technical solutions, and the technical solutions formed by these replacements are all within the scope of the technical solutions of the present disclosure.

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Abstract

本公开文本实施例提供了一种缝隙天线及移动终端。该缝隙天线包括金属块、金属框、至少两个接地片和至少一组天线组件，天线组件包括天线馈源、天线单元，以及至少两组匹配网络，金属框沿金属块的外周围设置，且与金属块之间形成缝隙；至少两个接地片设置在缝隙之中使金属框和金属块接地，且至少两个接地片分别设置在金属框的第一侧边和第二侧边上，第一侧边与第二侧边相对；天线组件设置在缝隙中，其中，天线馈源设置在金属块与天线单元之间，匹配网络设置在天线单元与金属框之间。

Description

缝隙天线及移动终端
相关申请的交叉引用
本申请主张在2015年4月27日在中国提交的中国专利申请No.201510210078.0的优先权，其全部内容通过引用包含于此。
技术领域
本公开文本涉及天线技术领域，特别是涉及一种缝隙天线和一种移动终端。
背景技术
随着用户对移动终端的金属质感的追求，带金属中框的移动终端对天线提出了带宽和设计复杂性的巨大挑战，特别是金属中框不能断点的情形。
目前，针对金属中框无断点的方案均采用缝隙天线及其演变等方式，但这仅仅是泛原理性的，具体的设计实现方面仍然会遇到设计复杂度大、难以同时兼顾各个频段、匹配损耗大、带宽不足等难题。
相关技术的方案中，为了兼顾各个频段，可以采用一个馈源一个接地点的拓朴结构产生比较好的低频谐振，而高频段则采用多个接地点，且接地位置与低频拓朴结构的接地位置不一样，采用这种方案的移动终端采用了极其复杂的接地匹配网络，虽然兼顾了低频和高频的性能，但存在着诸如匹配复杂，而且匹配损耗大，相互干扰，降低天线辐射效率等的缺点。
因此，目前需要迫切解决的一个技术问题就是：如何简化缝隙天线的结构同时兼顾高低频性能。
发明内容
本公开文本实施例所要解决的技术问题是提供一种缝隙天线和一种移动终端，能够简化缝隙天线的结构同时兼顾高低频性能。
为了解决上述问题，本公开文本公开了一种缝隙天线，包括金属块、金属框、至少两个接地片和至少一组天线组件，所述天线组件包括天线馈源、 天线单元，以及至少两组匹配网络，
所述金属框沿所述金属块的外周围设置，且与所述金属块之间形成缝隙；
所述至少两个接地片设置在所述缝隙之中使所述金属框和所述金属块接地，且所述至少两个接地片分别设置在所述金属框的第一侧边和第二侧边上，所述第一侧边与所述第二侧边相对设置；
所述天线组件设置在所述缝隙中，其中，所述天线馈源设置在所述金属块与所述天线单元之间，所述匹配网络设置在所述天线单元与所述金属框之间。
可选地，所述至少两个接地片之中，相邻两个接地片之间的缝隙长度恰好适应低频谐振的横向模和纵向模。
可选地，所述接地片到第三侧边的距离为50mm～100mm，其中，所述第三侧边位于所述金属框的所述第一侧边与所述第二侧边之间。
可选地，所述至少两组匹配网络中包括第一匹配网络和第二匹配网络，其中，所述第一匹配网络在低频的两个谐振频率上呈现不同的等效值。
可选地，所述第一匹配网络与所述第二匹配网络中的电感元件为整合在所述天线单元上的细线。
可选地，所述第一匹配网络与所述第二匹配网络中的电容元件为缝隙耦合。
可选地，所述第二匹配网络为所述天线单元与所述第三侧边间的缝隙耦合，其中，所述第三侧边位于所述金属框的所述第一侧边与所述第二侧边之间。
可选地，所述第二匹配网络连接于所述第三侧边的1/4～1/2部分之间。
可选地，所述第一匹配网络连接于所述第一侧边与所述第三侧边的连接处。
可选地，所述天线单元与所述金属块之间还连接有第三匹配网络。
可选地，所述金属框与所述金属块之间还连接有第四匹配网络。
本公开文本实施例还公开了一种移动终端，所述移动终端内设置有上述缝隙天线。
与相关技术相比，本公开文本实施例包括以下优点：
本公开文本实施例中的缝隙天线结构简单，通过在两侧边上设置接地片直接接地，不仅避免了信号经过接地点往上，对上面的天线(如GPS天线、WIFI天线、分集天线)产生干扰，而且，无需复杂的接地匹配，匹配损耗较小，同时天线组件通过至少两组匹配网络兼顾了低频和高频的谐振模态。
附图说明
为了更清楚地说明本申请实施例或相关技术中的技术方案，下面将对实施例或相关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申请中记载的一些实施例，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。以下附图并未刻意按实际尺寸等比例缩放绘制，重点在于示出本申请的主旨。
图1是本公开文本实施例中一种缝隙天线的结构示意图；
图2是本公开文本实施例中另一种缝隙天线的结构示意图；
图3是本公开文本实施例中第一匹配网络在不同频段的等效值曲线；
图4是本公开文本实施例中第一匹配网络的电路示意图；
图5是本公开文本实施例中第二匹配网络的电路示意图；
图6是本公开文本实施例中一种缝隙天线的回波损耗图；以及
图7是本公开文本实施例中另一种缝隙天线的结构示意图。
具体实施方式
为使本公开的实施例的目的、技术方案和优点更加清楚，下面将结合本公开的实施例的附图，对本公开的实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开文本保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开专利申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”或者“一” 等类似词语也不表示数量限制，而是表示存在至少一个。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也相应地改变。
本公开文本结合示意图进行详细描述，在详述本公开文本实施例时，为便于说明，表示装置结构的剖面图会不依一般比例作局部放大，而且所述示意图只是示例，其在此不应限制本公开文本保护的范围。此外，在实际制作中应包含长度、宽度及深度的三维空间尺寸。
下面结合附图和实施例，对本公开文本的技术方案进行描述。
在本公开文本一些实施例中，如图1所示，缝隙天线包括金属块11、金属框12、接地片13和天线组件14。
其中，金属块11可以是PCB或屏金属支架或金属电池盖等。金属框12为连续无断点的环形结构，当然在环形的表面上可以开有用于安装卡或者插入连接线的槽口，这些均不影响金属框12的连续性。金属框12设置在金属块11的外周围，且与金属块11之间形成一圈缝隙111。该缝隙111中可以填充空气、玻璃等非导电介质。
接地片13设置在缝隙111之中，使金属框12和金属块11接地。具体地，接地片13分别与金属框12和金属框11固定连接。该接地片13至少有两个，且分别设置在金属框12的两个相对的侧边上。
如图1所示，接地片13有两个，分别设置在金属框12的相对的第一侧边121和第二侧边122上。两个接地片13将缝隙111分割成了两个U型缝隙。其中一个U型缝隙可以用来设置上述天线组件，另一个U型缝隙可以集成其它天线。例如图1中下部的U型缝隙中设置天线组件14，上部的U型缝隙集成其它天线，如GPS天线、WIFI天线、分集天线。
在其它实施例中，该接地片13也可以有多个，例如还可以在图1中的U形缝隙中设置第三个接地片，但该接地片需串联高阻低通的滤波器，以便降低该第三个接地片对低频的影响，而高频性能则会受第三接地片的影响而得到提高。类似地，还可以继续增加接地片。相邻两个接地片之间的缝隙长度可以设置为恰好可以适应低频谐振的横向模和纵向模，以利于实现低频双谐 振。
天线组件14设置在缝隙111中，若接地片13如图1中设置，该天线组件14设置在下部的U型缝的底部。该天线组件14可以有多组。
天线组件14连接在金属块11和金属框12之间，该天线组件14包括天线馈源、天线单元，以及匹配网络。天线馈源设置在金属块11与天线单元之间，匹配网络设置在天线单元与金属框12之间。其中，匹配网络至少有两组。该天线组件14能够使缝隙天线同时满足低频如824-960MHz，高频如1710-2690MHz的需求。
本公开文本实施例中的缝隙天线结构简单，通过在两侧边上设置接地片直接接地，不仅避免了信号经过接地点往上，对上面的天线(如GPS天线、WIFI天线、分集天线)产生干扰，而且，无需复杂的接地匹配，匹配损耗较小，同时天线组件通过至少两组匹配网络兼顾了低频和高频的谐振模态。
在本公开文本一些实施例中，如图2所示，缝隙天线包括金属块21、金属框22、两个接地片23、24和天线组件，其中，天线组件包括天线馈源25、天线单元26，以及匹配网络，该匹配网络有两组，分别为第一匹配网络27和第二匹配网络28。在其它实施例中，为了更优的天线性能，可以在天线单元26和金属框22之间增加更多的匹配网络，也可以在天线单元26和金属块21之间增加更多的匹配网络，只是会增加缝隙天线的复杂度。
金属块21和金属框22分别与前述实施例中的金属块11和金属框12类似，此处不再赘述。金属框22设置在金属块21的外周围，且与金属块21之间形成一圈缝隙211。金属框22为长方形，具有第一侧边221、第二侧边222和第三侧边223。其中，第一侧边221与第二侧边222相对，第三侧边223位于第一侧边221与第二侧边222之间，具体可以为金属框22的底部侧边。
接地片23、24设置在缝隙211中，使金属块21和金属框22接地。接地片23设置在第一侧边221，接地片24设置在第二侧边222，两个接地片23、24将缝隙211分割为两个U型缝隙，两接地片23、24之间的缝隙长度恰好可以适应低频双谐振的模态，包括横向模和纵向模。接地片23、24距离第三侧边223的距离可以约为50-100mm，具体地，可以是接地片23距离第三侧边223的距离为90mm，接地片24距离第三侧边223的距离为100mm。当然， 该距离可以根据整机尺寸、缝宽、缝隙中填充的介质等因素而调整。
天线组件设置在缝隙211中，其中，天线馈源25设置在金属块21与天线单元26之间，第一匹配网络27和第二匹配网络28均设置在天线单元26与金属框22之间。
本实施例中，通过仿真不带天线单元时能够产生的低频和高频谐振模态可以设计合适的天线单元及匹配网络，能够把仿真获得的若干模态同时激励出来，使得缝隙天线同时满足低频如824-960MHz，高频如1710-2690MHz的需求。
以长宽高为140*70*7mm的具有金属框的移动终端为例，通过仿真产生的低频和高频谐振模态可以获知：
827MHz的模态是横向激励，可以设计合适的第一匹配网络27，使得天线馈源25进来的能量在827MHz能够通过第一匹配网络27达到金属框22上，而第二匹配网络28在827MHz比较阻碍能量通过，则可以激励出827MHz的谐振模态。
957MHz的模态是纵向激励，设计合适的第一匹配网络27，使得天线馈源25进来的能量在957MHz能够较平均地分配到第一匹配网络27和第二匹配网络28，进而激励到金属框22上，则可以激励出957MHz的谐振模态。
由此可见，第一匹配网络27在低频的两个谐振频率上呈现不同的等效值时，缝隙天线的低频呈现双谐振，从而可以达到扩展带宽的目的。
如图3所示为第一匹配网络27在不同频段的等效值，第一匹配网络27在低频段的第一谐振频率上呈现等效值为大电感、小电容。在低频段的第二谐振频率上呈现等效值为小电感、大电容。
同样的道理，高频的各个模态也可以因合适的第一匹配网络27和第二匹配网络28而同时激励出来。
通过1710一2690MHz高频段的谐振模态，可以发现金属框22第三侧边223也即底边的1/4至1/2部分总是电场较强的部分，因此在这一区间优化第二匹配网络28的位置和匹配值，使第二匹配网络28连接于第三侧边223的1/4～1/2部分之间，可以达到更好的高频性能。
具体地，第一匹配网络27与第二匹配网络28中的电感元件可以为整合 在天线单元26上的细线，电容元件可以为缝隙耦合。
第一匹配网络27可以由如图4所示的电感元件和电容元件组成，第一匹配网络27连接于第一侧边221与第三侧边223的连接处，如图2所示。第二匹配网络28，如图5所示，可以直接简化为天线单元26与第三侧边223间的缝隙耦合，且如图2所示，第二匹配网络28连接于第三侧边223的1/4～1/2部分之间。
天线馈源25可以适当左右移动以达到更佳效果。
如图6所述为上述实例中的缝隙天线的回波损耗图，该缝隙天线可明显在低频产生双谐振，高频带宽也很好。
在本公开文本的另一实施例中，如图7所示，天线单元26与金属块21之间还可以连接有第三匹配网络71，金属框22与所述金属块21之间还可以连接有第四匹配网络72，其中第三匹配网络71可以调整高频带宽更优，第四匹配网络72可以使天线单元26更灵活。
本公开文本实施例中的缝隙天线结构简单，通过在两侧边上设置两个接地片直接接地，不仅避免了信号经过接地点往上，对上面的天线(如GPS天线、WIFI天线、分集天线)产生干扰，而且，天线组件通过两组匹配网络实现了低频双谐振，扩展了带宽，同时实现了高频谐振模态，降低了人手对信号的吸收。
在其它实施例中，该金属框上对应设置其它集成天线的U型部分可以有断点，以使得其它天线性能更优，而对应设置天线组件的U型部分是连续无断点的；或者，金属框也可以不是完整的环形框，可以是半环形的框，该金属框是连续无断点的，金属框沿金属块的外周围设置，且与金属框形成U型缝隙，该U型缝隙内设置有天线组件。也即金属框只是在天线组件的设置位置附近连续无断点即可。
上述实施例中，天线单元的形状可以灵活多变，如长条形、U形、S形等等。移动终端的下端缝隙区域内还可以放置如USB或喇叭、麦克等器件。
本公开文本实施例还公开了一种移动终端，该移动终端包括上述实施例中的缝隙天线，该缝隙天线的具体结构请参照前述实施例的描述，此处不再赘述。
以上实施例中，各部件的形状和结构仅为示例，并非限定。并且，以上各部件还可以用其它具有相同功能的元件来分别替换，以组合形成更多的技术方案，且这些替换后形成的技术方案均应在本公开文本技术方案保护的范围之内。
以上所述，仅是本公开文本的较佳实施例而已，并非对本公开文本作任何形式上的限制。
虽然本公开文本已以较佳实施例披露如上，然而并非用以限定本公开文本。任何熟悉本领域的技术人员，在不脱离本公开文本技术方案范围情况下，都可利用上述揭示的方法和技术内容对本公开文本技术方案作出许多可能的变动和修饰，或修改为等同变化的等效实施例。因此，凡是未脱离本公开文本技术方案的内容，依据本公开文本的技术实质对以上实施例所做的任何简单修改、等同变化及修饰，均仍属于本公开文本技术方案保护的范围内。

Claims (12)

  1. 一种缝隙天线，包括金属块、金属框、至少两个接地片和至少一组天线组件，所述天线组件包括天线馈源、天线单元，以及至少两组匹配网络，
    所述金属框沿所述金属块的外周围设置，且与所述金属块之间形成缝隙；
    所述至少两个接地片设置在所述缝隙之中使所述金属框和所述金属块接地，且所述至少两个接地片分别设置在所述金属框的第一侧边和第二侧边上，所述第一侧边与所述第二侧边相对设置；
    所述天线组件设置在所述缝隙中，其中，所述天线馈源设置在所述金属块与所述天线单元之间，所述匹配网络设置在所述天线单元与所述金属框之间。
  2. 根据权利要求1所述的缝隙天线，其中，所述至少两个接地片之中，相邻两个接地片之间的缝隙长度恰好适应低频谐振的横向模和纵向模。
  3. 根据权利要求2所述的缝隙天线，其中，所述接地片到第三侧边的距离为50mm～100mm，其中，所述第三侧边位于所述金属框的所述第一侧边与所述第二侧边之间。
  4. 根据权利要求1所述的缝隙天线，其中，所述至少两组匹配网络中包括第一匹配网络和第二匹配网络，其中，所述第一匹配网络在低频的两个谐振频率上呈现不同的等效值。
  5. 根据权利要求4所述的缝隙天线，其中，所述第一匹配网络与所述第二匹配网络中的电感元件为整合在所述天线单元上的细线。
  6. 根据权利要求5所述的缝隙天线，其中，所述第一匹配网络与所述第二匹配网络中的电容元件为缝隙耦合。
  7. 根据权利要求4所述的缝隙天线，其中，所述第二匹配网络为所述天线单元与所述第三侧边间的缝隙耦合，其中，所述第三侧边位于所述金属框的所述第一侧边与所述第二侧边之间。
  8. 根据权利要求7所述的缝隙天线，其中，所述第二匹配网络连接于所述第三侧边的1/4～1/2部分之间。
  9. 根据权利要求8所述的缝隙天线，其中，所述第一匹配网络连接于所 述第一侧边与所述第三侧边的连接处。
  10. 根据权利要求1至9中任意一项所述的缝隙天线，其中，所述天线单元与所述金属块之间还连接有第三匹配网络。
  11. 根据权利要求1至9中任意一项所述的缝隙天线，其中，所述金属框与所述金属块之间还连接有第四匹配网络。
  12. 一种移动终端，其中，所述移动终端内设置有如权利要求1至11中任意一项所述的缝隙天线。
PCT/CN2016/080210 2015-04-27 2016-04-26 缝隙天线及移动终端 Ceased WO2016173485A1 (zh)

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