WO2017107451A1 - 可调谐天线以及移动终端 - Google Patents

可调谐天线以及移动终端 Download PDF

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Publication number
WO2017107451A1
WO2017107451A1 PCT/CN2016/089007 CN2016089007W WO2017107451A1 WO 2017107451 A1 WO2017107451 A1 WO 2017107451A1 CN 2016089007 W CN2016089007 W CN 2016089007W WO 2017107451 A1 WO2017107451 A1 WO 2017107451A1
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WO
WIPO (PCT)
Prior art keywords
antenna
tuning
tunable
frequency band
tunable antenna
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PCT/CN2016/089007
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English (en)
French (fr)
Inventor
黄奂衢
王君翊
程波
黄丽珊
Original Assignee
乐视控股（北京）有限公司
乐视移动智能信息技术（北京）有限公司
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Application filed by 乐视控股（北京）有限公司, 乐视移动智能信息技术（北京）有限公司 filed Critical 乐视控股（北京）有限公司
Publication of WO2017107451A1 publication Critical patent/WO2017107451A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • 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
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation

Definitions

  • the present application relates to electronic technologies, and more particularly to a tunable antenna and a mobile terminal.
  • CA Carrier Aggregation
  • the CA technology can not only aggregate CCs in the same frequency band, but also aggregate CCs between different frequency bands, this requires that when the transceiver frequency band changes, the impedance between the transceiver and the antenna can be matched, so that the antenna Not only can it adapt to the switching of the transceiver frequency band, but also has higher antenna efficiency on the CC in each frequency band switched to.
  • the antenna frequency band can be tuned by an antenna tuning technique.
  • the antenna tuning technique is divided into Tunable Impedance Matching (TIM) and Antenna Aperture Tuning (AAT).
  • TIM mainly installs a variable matching network between the antenna and the transceiver, and the variable matching network changes the impedance and/or topology of the antenna through the adjustable device and/or the switching device, thereby adapting the antenna to the transmitting and receiving.
  • the switching of the frequency band of the machine; and the AAT is to adapt the antenna to the switching of the transceiver frequency band by loading a grounded adjustable device and/or switching device at a certain point on the antenna arm.
  • the embodiment of the present invention provides a tunable antenna and a mobile terminal, which are used to solve the technical problem that the antenna debugging flexibility and performance are not high under the CA multi-band aggregation in the tunable antenna in the prior art.
  • a tunable antenna comprising:
  • At least two tuning circuits for tuning the antenna for a range of frequencies of the antenna are coupled to one end of the at least two tuning circuits.
  • a mobile terminal comprising a tunable antenna as described above.
  • the tunable antenna includes at least two tuning circuits for tuning the antenna for a frequency band range of the antenna, and an antenna arm connected to the at least two tuning circuits Tuning the frequency band range of the antenna through different tuning circuits, so that the tuning circuit is more targeted when tuning, not only can the tunable antenna be more easily tuned to different frequency bands, but also the tunable antenna can be tuned in each frequency band. Achieve higher antenna efficiency, which enhances the tuning flexibility of the tunable antenna.
  • FIG. 1 is a schematic structural diagram of a tunable antenna according to an embodiment of the present application.
  • 3 is a second schematic diagram of the connection relationship of the tuning circuit 11;
  • FIG. 5 is a circuit structure of a tunable antenna according to an embodiment of the present application.
  • Figure 6 is a control tunable antenna circuit structure
  • Figure 7 is the antenna return loss test result
  • FIG. 8 shows the results of the antenna efficiency test.
  • FIG. 1 is a schematic structural diagram of a tunable antenna according to an embodiment of the present disclosure.
  • the tunable antenna includes at least two tuning circuits 11 and an antenna arm 12 .
  • At least two of the tuning circuits 11 are connected to the antenna arm 12, and the other ends of the at least two tuning circuits 11 are grounded.
  • the tuning circuit 11 is used to tune the antenna, and the different tuning circuits 11 can have different frequency band tuning ranges.
  • the frequency band tuning range refers to the tuning circuit 11 tuning for at least one frequency band, and the frequency bands for which the frequency band is tuned range.
  • the tuning range of the frequency band of each tuning circuit 11 can be completely different, that is, there is no same frequency band, or it can be partially identical, that is, at least two tuning circuits 11 are tuned to the same at least one frequency band, at least one Tuning in different frequency bands.
  • the tunable antenna when the tunable antenna includes two tuning circuits 11, one tuning circuit 11 is tuned for the antenna low frequency band, and the other tuning circuit 11 is tuned for the antenna high frequency band, the high frequency band and The low frequency bands are independent of each other, so that the tuning ranges of the two tuning circuits 11 are completely different, and there is no same frequency band.
  • the tunable antenna when the tunable antenna includes two tuning circuits 11, one tuning circuit 11 is tuned for the antenna low frequency band, and the other tuning circuit 11 is for the antenna high frequency band and the antenna low frequency band. Tuning is performed at the same time, so that the tuning ranges of the two tuning circuits 11 all include the low frequency band of the antenna, and thus are partially identical.
  • the antenna arm 12 may specifically be a short arm for tuning the high frequency band of the antenna, or a long arm for tuning the low frequency band of the antenna.
  • the long arm is mainly used to tune the low frequency band of the antenna, but in actual use, the tuning of the long arm can also affect the high frequency band of the antenna.
  • the tunable antenna structure usually includes two antenna arms, one is a long arm, mainly used to tune the low frequency band, and the other is a short arm, which is mainly used to tune the high frequency band.
  • the low-band coverage ranges from 698MHz to 960MHz, such as the 700MHz, 750MHz, 850MHz, and 900MHz bands;
  • the high-band coverage ranges from 1710MHz to 2700MHz, such as the 1800MHz, 1900MHz, 2100MHz, and 2600MHz bands.
  • the at least two tuning circuits 11 provided in this embodiment can be connected to the short arm to achieve tuning of the high frequency band; or can be connected to the long arm, so as to be mainly for, but not limited to, tuning the low frequency band; It is connected to the long arm and the short arm to tune both the high frequency band and the low frequency band.
  • CA technology In CA technology, it is roughly divided into three aggregation modes, aggregation of adjacent CCs in a frequency band, aggregation of non-adjacent CCs in a frequency band, and aggregation of CCs between different frequency bands.
  • the antennas are required to have higher antenna efficiency in the frequency bands to be aggregated, so that the performance requirements of the tunable antennas are higher.
  • the method of increasing the effective radiation volume of the antenna is generally used to improve the performance of the antenna, but this method expands the space required by the antenna, so that the mobile terminal The size of the whole machine is enlarged.
  • the tunable antenna includes at least two tuning circuits 11 that tuned the antenna for different frequency band ranges, and the antenna arms 12 connected to the at least two tuning circuits 11, the tuning is performed for different frequency band ranges by different tuning circuits 11.
  • the tuning circuit 11 is more targeted when performing tuning, not only can the tunable antenna be more easily tuned to different frequency bands, but also enables the tunable antenna to achieve higher efficiency in the tuned frequency band, thereby enhancing the Tunable flexibility of tunable antennas.
  • the antenna is increased in size by increasing the size of the antenna. Therefore, the antenna space can be saved without enlarging the overall size.
  • each tuning circuit 11 is included in each tuning circuit 11, and the tuning component is a tunable device, a fixed device or a switching device.
  • the adjustable device is a tunable capacitor or a tunable inductor
  • the fixed device is a fixed capacitor or a fixed inductor.
  • FIG. 2 is one of the schematic diagrams of the connection relationship of the tuning circuit 11.
  • the tuning circuits 11 are connected in parallel with each other;
  • FIG. 3 is the second schematic diagram of the connection relationship of the tuning circuit 11, and in FIG. The tuning circuits 11 are connected in series with each other;
  • FIG. 4 is a third schematic diagram of the connection relationship of the tuning circuit 11, and three tuning circuits 11 are included in FIG. 4, wherein the two tuning circuits are connected in series with another tuning circuit in parallel.
  • the tuning circuits 11 are connected in series or in parallel with each other. Since different tuning circuits 11 can be designed for different frequency ranges, in actual use, it is often necessary to adjust the frequency of an antenna in the corresponding frequency band during the adjustment process of one tuning circuit 11, and also affect other frequency bands. The antenna frequency within the frequency band causes the antenna frequency points in other frequency bands to also move. Therefore, the interconnection relationship between the respective tuning circuits 11 and the structure of each tuning circuit 11 can be designed according to the movement of the antenna frequency points.
  • the number of tuning circuits 11 is two, and each tuning circuit 11 may have one or more tuning elements, while the two tuning circuits may include at least one different tuning element.
  • the plurality of tuning elements in each of the tuning circuits 11 may be connected in series to each other or in parallel to each other, or may be serially and in parallel.
  • a plurality of structures may be tested, and a manner of selecting the structure having the highest antenna efficiency from the plurality of structures may be determined.
  • the tuning elements in the same tuning circuit 11 are connected in series; or the tuning elements in the same tuning circuit 11 are connected in parallel with each other.
  • the antenna arm 12 may further include a feed terminal connected to the feed via the feed terminal.
  • the antenna arm 12 may further include a ground terminal via which the ground terminal is grounded.
  • the grounding of the antenna arm 12 in FIG. 1 via the grounding terminal is not necessary.
  • the antenna arm 12 when the antenna arm 12 is grounded via the grounding terminal, it conforms to the alpha antenna form, and the antenna form can be used.
  • the antenna impedance In a mobile terminal of a metal casing, the antenna impedance can be adjusted more easily by providing different devices between the ground terminal and the grounding point.
  • the position at which the antenna arm 12 is grounded and connected to the feed source in FIG. 1 is only an illustration, and the position of being grounded via the ground terminal and the position connected to the feed source during actual use are not limited to those shown in the drawing.
  • the position grounded via the ground terminal in FIG. 1 can be interchanged with the tuning circuit 11.
  • FIG. 5 is a tunable antenna circuit according to an embodiment of the present application, as shown in FIG.
  • the tunable antenna structure includes two tuning circuits, each of which includes a tuning element. Among them, one tuning circuit includes a tunable capacitor C, and the other tuning circuit includes a tunable inductor L. The tunable capacitor C and the adjustable inductor L are connected in parallel.
  • the adjustable inductance L is reduced in the tunable antenna circuit configuration shown in FIG. 5, in the low frequency band, the frequency of the antenna moves toward the high frequency direction.
  • a low-frequency resonance center of the antenna that is, a frequency point of the antenna in the low-band antenna
  • a high-frequency resonance center of the antenna that is, at a frequency point of the high-band antenna, moving from 1760MHz to 1710MHz, it can be seen that although the frequency of the antenna moves toward the high frequency direction in the low frequency band, the frequency of the antenna in the high frequency band moves toward the low frequency direction. The phenomenon, but the low frequency band moves more, the high frequency band moves very little. Therefore, the adjustable inductor L is mainly used for tuning for the low frequency band.
  • the tunable capacitance C is increased in the tunable antenna circuit structure shown in FIG. 5, in the low frequency band, the frequency of the antenna moves toward the low frequency direction, and at the same time, at the high frequency band.
  • the frequency of the line also moves in the low frequency direction.
  • a low-frequency resonance center of the antenna that is, a frequency point of the antenna in the low-band antenna
  • a high-frequency resonance center of the antenna that is, A frequency point of the high-band antenna moves from 2130MHz to 1760MHz. It can be seen that the frequency of the antennas in the high-band and low-band antennas are more moved. Therefore, the tunable capacitor C is mainly used for tuning for both the low frequency band and the high frequency band.
  • the tunable capacitor C and the tunable inductor L are tuned for different frequency band ranges. Therefore, in actual use, the antenna can be tuned to the desired frequency point by adjusting the adjustable capacitor C. After adjusting the adjustable inductor L, the antenna frequency is tuned in the low frequency band, and the antenna is more easily tuned to Different frequency bands.
  • the grounding of the antenna arm in FIG. 5 is not necessary, and is only an alternative. At the same time, the grounding of the antenna arm and the position connected to the feeding source in FIG. 5 are only used as an indication, in actual use. The position of the ground and the position connected to the feed are not limited to those shown in the figure. As a possible implementation, the grounded position in FIG. 1 can be interchanged with the tuning circuit formed by the adjustable capacitor C and the adjustable inductor L.
  • the present application performs the antenna return loss (RL) test and the antenna efficiency (Antenna Efficiency) test.
  • the tunable antenna in the form of AAT is selected as the control.
  • 6 is the structure of the tunable antenna circuit of the control.
  • a tuning component is included, that is, the capacitance C' can be adjusted, and the results obtained by the test are shown in FIG. 7 and FIG. 8, respectively,
  • FIG. 7 is Antenna return loss test results
  • Figure 8 is the antenna efficiency test results.
  • the thick dashed line and the thin dashed line correspond to the RL test result of the tunable antenna
  • the thick dashed line is the RL test result of the tunable antenna of the tunable antenna when the adjustable capacitor C′ takes a value of 1.1 pF
  • the thin dotted line is The RL test result of the tunable antenna of the control capacitor C' is 2.7pF.
  • the solid line is the RL test result of the tunable antenna in Figure 5, where the adjustable capacitor C has a value of 2.7 pF and the adjustable inductor L has a value of 27 nH.
  • the solid line of the triangle and the solid line of the point correspond to the antenna efficiency test result of the tunable antenna
  • the solid line of the triangle is the tunable of the adjustable capacitor C' when the value is 1.1 pF.
  • the antenna efficiency test result of the antenna is the antenna efficiency test result of the tunable antenna of the tunable antenna when the adjustable capacitance C' is 2.7pF.
  • the solid line is the antenna efficiency test result of the tunable antenna in FIG. 5, wherein the adjustable capacitor C has a value of 2.7 pF and the adjustable inductor L has a value of 27 nH.
  • the tunable antenna in the form of AAT is completely unable to meet the CA requirements of different bands of Band 12+Band 2 and the CA requirements of different bands of Band 12+Band 4.
  • the tunable antenna in FIG. 5 has better antenna efficiency performance than the control tunable antenna in the Band 12+Band 2 band and the Band 12+Band 4 band. That is to say, the Band 12+Band 2 band and the Band 12+Band 4 band can be well covered to meet the CA requirements in both cases.
  • the two tuning circuits 11 respectively correspond to the design of the low frequency band and the high frequency band, so that the flexibility and the wider antenna performance debugging range are provided, thereby reducing the wireless which is similar to the original CA work.
  • the antenna space required for performance, especially the CA between different frequency bands, can increase the overall size of the product without compromising the overall size of the product.
  • the tunable antenna includes at least two tuning circuits for tuning the antenna for a frequency band range of the antenna, and antenna arms connected to the at least two tuning circuits, for different antennas through different tuning circuits
  • the tuning of the frequency range makes the tuning circuit more specific when tuning, not only makes it easier to tune the tunable antenna to different frequency bands, but also enables the tunable antenna to be implemented in each frequency band. High antenna efficiency, which enhances the tuning flexibility of tunable antennas.
  • This embodiment provides a mobile terminal, including the tunable antenna provided by the foregoing embodiment.
  • the tunable antenna can be installed in the mobile terminal and connected to the transceiver in the mobile terminal.
  • the mobile terminal adopts a tunable antenna that is tuned to the frequency band range of the antenna through different tuning circuits, so that the tuning circuit is more targeted when performing tuning, and not only can the tunable antenna be more easily tuned to Different frequency bands, and tunable antennas can achieve higher antenna efficiency in each frequency band, thereby enhancing the tuning flexibility of the tunable antenna.
  • the method of increasing the antenna volume is also avoided to improve the performance of the antenna. Therefore, the antenna space can be saved without expanding the overall size of the mobile terminal.

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Abstract

一种可调谐天线以及移动终端，可调谐天线包括用于针对天线的频段范围对所述天线进行调谐的至少两个调谐电路，以及与该至少两调谐电路的一端相连接的天线臂。根据本申请实施例，通过不同的调谐电路针对天线的频段范围进行调谐，使得调谐电路在进行调谐时更加具有针对性，不仅能够更加容易地将可调谐天线调谐至不同频段，而且使得可调谐天线在各频段均能够实现较高的天线效率，从而增强了可调谐天线的调谐灵活性。

Description

可调谐天线以及移动终端
本专利申请要求申请日为2015年12月22日、申请号为2015109715150的中国专利申请的优先权，并将上述专利申请以引用的方式全文引入本文中。
技术领域
本申请涉及电子技术，尤其涉及一种可调谐天线以及移动终端。
背景技术
为了满足用户不断提升的传输速率要求，LTE-Advanced系统引入了一项增加传输带宽的技术，也就是载波聚合(Carrier Aggregation，CA)。CA技术可以将2至5个LTE成员载波(ComponentCarrier，CC)聚合在一起承载收发的数据，实现最大为100MHz的传输带宽，有效提高了上下行传输速率。由于CA技术不仅可以对处于同一频段内的CC进行聚合，还可以对不同频段间的CC进行聚合，因此，这就要求当收发机频段改变时，收发机与天线之间阻抗能够匹配，使得天线不仅能够适应收发机频段的切换，而且在切换至的各频段内的CC上均具有较高的天线效率。
在现有技术中，可以通过天线调谐技术实现对天线频段的调谐，天线调谐技术分为可调式阻抗匹配调谐(Tunable Impedance Matching，TIM)以及天线孔径调谐(Antenna Aperture Tuning，AAT)。其中，TIM主要是通过在天线和收发机之间植入可变匹配网络，该可变匹配网络通过可调器件和/或开关器件来改变天线的阻抗和/或拓扑结构，从而使天线适应收发机频段的切换；而AAT则是通过在天线臂上某一点加载一个接地的可调器件和/或开关器件使天线适应收发机频段的切换。
但现有的两种天线调谐技术均存在局限性，较难兼顾多频段，即，无法在多频段都有较好的天线性能，故而往往无法满足CA的性能需求。
发明内容
本申请实施例提供一种可调谐天线以及移动终端，用于解决现有技术中的可调谐天线所具有的CA多频段间聚合情况下天线调试灵活性差以及性能不高的技术问题。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种可调谐天线，包括：
用于针对天线的频段范围对所述天线进行调谐的至少两个调谐电路；以及与所述至少两个调谐电路的一端连接的天线臂。
第二方面，提供了一种移动终端，包括如上所述的可调谐天线。
本申请实施例提供的可调谐天线以及移动终端，可调谐天线包括用于针对天线的频段范围对所述天线进行调谐的至少两个调谐电路，以及与该至少两个调谐电路相连接的天线臂，通过不同的调谐电路针对天线的频段范围进行调谐，使得调谐电路在进行调谐时更加具有针对性，不仅能够更加容易地将可调谐天线调谐至不同频段，而且使得可调谐天线在各频段均能够实现较高的天线效率，从而增强了可调谐天线的调谐灵活性。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在整个附图中，用相同的参考符号表示相同的部件。在附图中：
图1为本申请实施例提供的一种可调谐天线的结构示意图；
图2为调谐电路11连接关系示意图之一；
图3为调谐电路11连接关系示意图之二；
图4为调谐电路11连接关系示意图之三；
图5为本申请实施例提供的一种可调谐天线电路结构；
图6为对照可调谐天线电路结构；
图7为天线回损测试结果；
图8为天线效率测试结果。
具体实施方式
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
下面结合附图对本申请实施例提供的可调谐天线以及移动终端进行详细描述。
实施例一
图1为本申请实施例提供的一种可调谐天线的结构示意图，在本实施例中，如图1所示，可调谐天线包括：至少两个调谐电路11和天线臂12。
其中，至少两个调谐电路11的一端与天线臂12连接，至少两个调谐电路11的另一端接地。调谐电路11用于对天线进行调谐，不同的调谐电路11可以具有不同的频段调谐范围，这里所说的频段调谐范围是指调谐电路11针对至少一个频段进行调谐，所针对的这些频段构成频段调谐范围。各调谐电路11的频段调谐范围既可以是完全不同的，即没有相同的频段，也可以是部分相同的，即至少存在两个调谐电路11对相同的至少一个频段进行调谐的同时，对至少一个不同的频段进行调谐。
例如：在一种可能的实现方式中，可调谐天线包括两个调谐电路11时，其中一个调谐电路11针对天线低频段进行调谐，而另一个调谐电路11针对天线高频段进行调谐，高频段和低频段之间相互独立，从而两个调谐电路11的频段调谐范围是完全不同的，没有相同的频段。
又例如：在另一种可能的实现方式中，可调谐天线包括两个调谐电路11时，其中一个调谐电路11针对天线低频段进行调谐，而另一个调谐电路11针对天线高频段和天线低频段同时进行调谐，从而两个调谐电路11的频段调谐范围均包括了天线低频段，因而是部分相同的。
天线臂12具体可以为调谐天线高频段的短臂，也可以为调谐天线低频段的长臂。
需要说明的是，长臂主要用于调谐天线低频段，但在实际使用过程中，长臂的调谐也可以对天线高频段产生影响。
一般情况下，可调谐天线结构通常包括两个天线臂，一个为长臂，主要用于调谐低频段，另一个为短臂，主要用于调谐高频段。低频段的覆盖范围为698MHz至960MHz，例如700MHz、750MHz、850MHz和900MHz频段；高频段覆盖范围为1710MHz至2700MHz，例如1800MHz、1900MHz、2100MHz和2600MHz频段。本实施例所提供的至少两个调谐电路11既可与短臂相连接，从而实现对高频段的调谐；也可以与长臂相连接，从而主要针对但不限于对低频段调谐；还可以同时与长臂、短臂相连接，从而对高频段和低频段均进行调谐。
在CA技术中，大致分为三种聚合方式，频段内相邻CC的聚合，频段内不相邻CC的聚合，以及不同频段间的CC的聚合。尤其针对不同频段间的CC的聚合，要求天线能够在所聚合的频段下均具有较高的天线效率，从而对可调谐天线的性能要求较高。在现有技术中，若可调谐天线不能满足CA技术的性能需求，通常采用增大天线有效辐射体积的方式，来提升天线的性能，但这种方式扩大了天线所需空间，使得移动终端的整机尺寸扩大。
由于可调谐天线包括针对不同频段范围对天线进行调谐的至少两个调谐电路11，以及与该至少两个调谐电路11相连接的天线臂12，通过不同的调谐电路11针对不同的频段范围进行调谐，使得调谐电路11在进行调谐时更加具有针对性，不仅能够更加容易地将可调谐天线调谐至不同频段，而且使得可调谐天线在所调谐至的频段均能够实现较高的效率，从而增强了可调谐天线的调谐灵活性。同时，也避免了 采用增大天线体积的方式，来提升天线的性能，因此，能够节约天线空间，无需扩大整机尺寸。
具体的，在每一个调谐电路11中均包括至少一个调谐元件，调谐元件为可调器件、固定器件或开关器件。其中，可调器件为可调电容或可调电感，固定器件为固定电容或固定电感。
当调谐电路11包括至少两个调谐元件时，在同一调谐电路11中的调谐元件相互串联；或者，在同一调谐电路11中的调谐元件相互并联；或者，在同一调谐电路11中的调谐元件串并混联，也就是说既包含串联关系也包含并联关系。如图2至4所示，图2为调谐电路11连接关系示意图之一，在图2中各调谐电路11之间相互并联；图3为调谐电路11连接关系示意图之二，在图3中各调谐电路11之间相互串联；图4为调谐电路11连接关系示意图之三，在图4中包括三个调谐电路11，其中，两个调谐电路并联之后与另外的一个调谐电路串联。
优选的，为了调试方便，采用调谐电路11之间相互串联或相互并联的方式。由于不同的调谐电路11尽管可以针对不同的频段范围进行设计，但实际使用时，往往对一个调谐电路11进行调节过程中，不仅会使得对应频段内的天线频点移动，而且还会影响其他频段内的天线频点，使得其他频段内的天线频点也出现移动，因此，可以根据天线频点的移动情况，设计各个调谐电路11之间的相互连接关系，以及各个调谐电路11的结构。
在一种可能的实现方式中，调谐电路11的个数为两个，每一个调谐电路11可以具有一个或多个调谐元件，同时两个调谐电路可以包括至少一个不相同的调谐元件。每一个调谐电路11中的多个调谐元件可以相互串联也可以相互并联，还可以串并混联。具体在调谐电路11的结构的确定过程中，可采用试验多种结构，从该多种结构中选取使得天线效率最高的结构的方式进行确定。优选的，为了调试方便，在同一调谐电路11中的调谐元件相互串联；或者，在同一调谐电路11中的调谐元件相互并联。
进一步，如图1所示，天线臂12还可以包括一个馈送端子，经由该馈送端子连接到馈源。同时，天线臂12还可以包括一个接地端子，经由该接地端子接地。
需要说明的是，图1中天线臂12经由接地端子接地并不是必须的，仅作为一种可选方案，当天线臂12经由接地端子接地时，符合阿尔法天线形式，这种天线形式可以被用于金属外壳的移动终端中，通过在接地端子与接地点之间设置不同的器件，可以更加容易的调节天线阻抗。
同时，在图1中天线臂12接地和连接到馈源的位置仅作为一种示意，在实际使用过程中，经由接地端子接地的位置以及连接到馈源的位置不限于图中所示。作为一种可能的实现方式，图1中经由接地端子接地的位置可与调谐电路11互换。
为了清楚说明本实施例，本实施例提供了一种具体的可调谐天线的示意图，图5为本申请实施例提供的一种可调谐天线电路，如图5所示：
该可调谐天线结构包括两调谐电路，其中每一个调谐电路包括一个调谐元件。其中，一个调谐电路包括一个可调电容C，另一个调谐电路包括一个可调电感L。可调电容C和可调电感L之间为并联。
一方面，若在图5所示的可调谐天线电路结构中，可调电感L减小，则在低频段，天线的频点向高频方向移动。
例如：可调电感L的对地电感从无穷大减小为27nh的过程中，天线的一个低频谐振中心，即在低频段天线的一个频点，由600MHz移动到730MHz，天线的一个高频谐振中心，即在高频段天线的一个频点，从1760MHz移动到1710MHz，可见，尽管随着天线的频点在低频段向高频方向移动的同时，出现了在高频段天线的频点向低频方向移动的现象，但低频段移动的较多，高频段移动很少。因此，可调电感L主要用于针对低频段进行调谐。
另一方面，若在图5所示的可调谐天线电路结构中，可调电容C增大，则在低频段，天线的频点向低频方向移动，同时，在高频段天 线的频点也向低频方向移动。
例如：可调电容C从1.1pF增大至2.7pF过程中，天线的一个低频谐振中心，即在低频段天线的一个频点，由730MHz移动到600MHz，天线的一个高频谐振中心，即在高频段天线的一个频点，由2130MHz移动到1760MHz，可见，在高频段和低频段天线的频点均移动较多。因此，可调电容C主要用于针对低频段和高频段均进行调谐。
基于上述调谐过程可见，在图5所示的可调谐天线电路中，可调电容C和可调电感L针对不同的频段范围进行了调谐。从而在实际使用过程中，可以通过调整可调电容C将天线在高频段调谐至所需频点后，调整可调电感L再在低频段对天线频点进行调谐，更加容易的将天线调谐至不同频段。
需要说明的是，图5中天线臂接地并不是必须的，仅作为一种可选方案，同时，在图5中天线臂接地和连接到馈源的位置仅作为一种示意，在实际使用过程中，接地的位置以及连接到馈源的位置不限于图中所示。作为一种可能的实现方式，图1中接地的位置可与可调电容C和可调电感L所构成的调谐电路互换。
为了试验图5中可调谐天线的性能，本申请进行了天线回波损耗(ReturnLoss，RL)测试以及天线效率(Antenna Efficiency)测试，在测试中，选取了AAT形式的可调谐天线作为对照，图6为对照的可调谐天线电路的结构，在该对照的可调谐天线电路中包括一个调谐元件，即可调电容C’，测试所获得的结果分别如图7和图8所示，图7为天线回损测试结果，图8为天线效率测试结果。
如图7所示，其中粗虚线和细虚线对应对照可调谐天线的RL测试结果，粗虚线为可调电容C’取值为1.1pF时对照的可调谐天线的RL测试结果，细虚线为可调电容C’取值为2.7pF时对照的可调谐天线的RL测试结果。实线则是图5中可调谐天线的RL测试结果，其中，可调电容C取值为2.7pF，可调电感L取值为27nH。
如图8所示，其中三角实线和点实线对应对照可调谐天线的天线效率测试结果，三角实线为可调电容C’取值为1.1pF时对照的可调谐 天线的天线效率测试结果，点实线为可调电容C’取值为2.7pF时对照的可调谐天线的天线效率测试结果。实线则是图5中可调谐天线的天线效率测试结果，其中，可调电容C取值为2.7pF，可调电感L取值为27nH。
通过图7和图8可清楚看出，针对对照的可调谐天线，当其满足低频的频率覆盖范围为698MHz至746MHz的LTE频段(Band)12的天线效率以及RL性能需求时，在频率覆盖范围为1710MHz至2155MHz的LTE Band 2和Band 4，这两个频段下天线效率以及RL性能较差。
而另一方面，通过图7和图8还可清楚看出，针对对照的可调谐天线，当其满足LTE Band 2和Band 4的天线效率以及RL性能需求时，在低频的LTE Band12频段下，天线效率以及RL性能较差，低于-10dB。
也就是说，采用AAT形式的可调谐天线作为对照完全无法满足Band 12+Band 2不同频带间CA需求，以及Band 12+Band 4不同频带间CA需求。
而通过图7和图8中的实线可清楚看出，图5中的可调谐天线，其在Band 12+Band 2频段以及Band 12+Band 4频段，天线效率性能优于对照的可调谐天线，也就是说，可以良好地覆盖Band 12+Band 2频段以及Band 12+Band 4频段，满足这两种情况下的CA需求。
这是由于其中的两个调谐电路11分别对应低频段与高频段的设计，故具有更高的灵活性以及更广的天线性能调试范围，以此可减少原本若要达到CA工作下相近的无线性能所需的天线空间，尤其是不同频带间的CA，故可使整机尺寸不需因此而增大，而提升产品整体的竞争力与用户体验。
本实施例中，可调谐天线包括用于针对天线的频段范围对所述天线进行调谐的至少两个调谐电路，以及与该至少两个调谐电路相连接的天线臂，通过不同的调谐电路针对天线的频段范围进行调谐，使得调谐电路在进行调谐时更加具有针对性，不仅能够更加容易地将可调谐天线调谐至不同频段，而且使得可调谐天线在各频段均能够实现较 高的天线效率，从而增强了可调谐天线的调谐灵活性。
实施例二
本实施例提供了一种移动终端，包括前述实施例所提供的可调谐天线。
具体的，该可调谐天线可以安装于移动终端中，与移动终端中的收发机连接。
其中，可调谐天线的具体结构在本实施例中不再赘述，可参见前述实施例中的相关描述。
本实施例中，移动终端由于采用了通过不同的调谐电路针对天线的频段范围进行调谐的可调谐天线，使得调谐电路在进行调谐时更加具有针对性，不仅能够更加容易地将可调谐天线调谐至不同频段，而且使得可调谐天线在各频段均能够实现较高的天线效率，从而增强了可调谐天线的调谐灵活性。同时，也避免了采用增大天线体积的方式，来提升天线的性能，因此，能够节约天线空间，无需扩大移动终端的整机尺寸。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (11)

  1. 一种可调谐天线，其特征在于，包括：
    用于针对天线的频段范围对所述天线进行调谐的至少两个调谐电路；以及与所述至少两个调谐电路的一端连接的天线臂；
    其中，所述至少两个调谐电路的另一端接地。
  2. 根据权利要求1所述的可调谐天线，其特征在于，
    在所述至少两个调谐电路的频率调谐范围中，不存在相同的频段；或者，
    在所述至少两个调谐电路的频段调谐范围中，存在至少一个相同的频段。
  3. 根据权利要求1所述的可调谐天线，其特征在于，所述调谐电路包括至少一个调谐元件，所述调谐元件为可调器件、固定器件或开关器件。
  4. 根据权利要求3所述的可调谐天线，其特征在于，所述可调器件为可调电容或可调电感。
  5. 根据权利要求3所述的可调谐天线，其特征在于，所述固定器件为固定电容或固定电感。
  6. 根据权利要求3所述的可调谐天线，其特征在于，所述可调谐天线包括两个调谐电路；
    所述两个调谐电路相互并联；
    在所述两个调谐电路中至少一个调谐元件不相同。
  7. 根据权利要求6所述的可调谐天线，其特征在于，
    所述两个调谐电路中的一个调谐电路包括一个可调电容；
    所述两个调谐电路中的另一个调谐电路包括一个可调电感。
  8. 根据权利要求3所述的可调谐天线，其特征在于，所述调谐电路包括以串联和/或并联方式连接的至少两个调谐元件。
  9. 根据权利要求1-8任一项所述的可调谐天线，其特征在于，
    所述天线臂为用以调谐天线的高频段的短臂；和/或
    所述天线臂为用以调谐天线的低频段的长臂。
  10. 根据权利要求9所述的可调谐天线，其特征在于，
    所述低频段覆盖范围为698MHz以上，且960MHz以下；
    所述高频段覆盖范围为1710MHz以上，且2700MHz以下。
  11. 一种移动终端，其特征在于，包括如权利要求1-10任一项所述的可调谐天线。
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