WO2012079305A1 - Terminal antenna - Google Patents

Terminal antenna Download PDF

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Publication number
WO2012079305A1
WO2012079305A1 PCT/CN2011/071268 CN2011071268W WO2012079305A1 WO 2012079305 A1 WO2012079305 A1 WO 2012079305A1 CN 2011071268 W CN2011071268 W CN 2011071268W WO 2012079305 A1 WO2012079305 A1 WO 2012079305A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
mhz
matching circuit
terminal
matching circuits
Prior art date
Application number
PCT/CN2011/071268
Other languages
French (fr)
Chinese (zh)
Inventor
江晖
艾浩
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012079305A1 publication Critical patent/WO2012079305A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Definitions

  • the present invention relates to a communication hub or, in particular, to a terminal antenna.
  • LTE Long-Term Evolution
  • 3G Third Generation Partnership Project
  • LTE-type terminals must also rely on existing 3G and 2G communication networks. Otherwise, the scope of use of LTE-type terminals will be small and the user experience will be poor.
  • LTE Long Term Evolution
  • 3G 3G
  • MIMO multiple input multiple output
  • FIG. 1 is a schematic diagram of the antenna design according to the prior art.
  • the antenna generally includes a monopole.
  • An antenna such as an antenna monopole, a Planer Inverted F-shaped Antenna (PIFA) or an Inverted F-shaped Antenna (IFA).
  • PIFA Planer Inverted F-shaped Antenna
  • IFA Inverted F-shaped Antenna
  • a primary object of the present invention is to provide a terminal antenna to at least solve the above problems.
  • a terminal antenna including: an antenna and a matching circuit, wherein the matching circuit is at least two groups, and the antenna is connected to the matching circuit of the at least two groups, wherein each A group matching circuit is used to operate the antenna at a predetermined frequency range.
  • the antenna and the at least two sets of matching circuits are connected by a switch for switching the matching circuit.
  • the switch is located between the matching circuit of the at least two groups and the feed point of the antenna.
  • the matching circuit is two groups, one of which enables the antenna to operate at 746 MHz to 787 MHz, and the other group enables the antenna to operate at 824 MHz to 960 MHz and 1710 MHz to 2170 MHz.
  • the matching circuit is three groups, the first group enables the antenna to operate at 746 MHz to 787 MHz, the second group enables the antenna to operate at 824 MHz to 894 MHz, and the third group enables the antenna to operate at 925 MHz to 960 MHz and 1710MHz ⁇ 2170MHz.
  • the antenna includes a primary antenna and a secondary antenna, wherein the primary antenna and the secondary antenna are respectively disposed on a bracket.
  • the type of the antenna is at least one of the following: a monopole antenna Monopole, an inverted F antenna IFA, and a planar inverted F antenna PIFA.
  • FIG. 1 is a schematic diagram of a scheme of an antenna design according to prior art
  • 2 is a schematic diagram of an antenna design of two sets of matching circuits according to a preferred embodiment of the present invention
  • FIG. 3 is a schematic diagram of an antenna design of three sets of matching circuits for use in accordance with a preferred embodiment of the present invention.
  • a terminal antenna including: an antenna and a matching circuit, wherein the matching circuit is at least two groups, and the antenna is connected with at least two sets of matching circuits, and each group of matching circuits is used to make the antenna work.
  • the predetermined frequency range Through the antenna, the number of matching circuits is increased, and the antenna efficiency is improved compared to the prior art without increasing the size of the PCB and sacrificing certain frequency bands.
  • the antenna and at least two sets of matching circuits are connected by a switch for switching the matching circuit.
  • the connection antenna and the at least two sets of matching circuits do not need to be switches, and may be other embodiments as long as the purpose of switching the matching circuit can be achieved.
  • the switch may be preferably located between at least two sets of matching circuits and feed points of the antenna.
  • the matching circuit is two groups, one of which enables the antenna to operate at 746 MHz to 787 MHz, and the other group enables the antenna to operate at 824 MHz to 960 MHz and 1710 MHz to 2170 MHz.
  • the matching circuit is three groups, the first group enables the antenna to operate at 746 MHz to 787 MHz, the second group enables the antenna to operate at 824 MHz to 894 MHz, and the third group enables the antenna to operate at 925 MHz to 960 MHz and 1710 MHz to 2170 MHz.
  • the related problems existing in the prior art are solved, and the performance of the LTE multimode terminal antenna is realized, and the size of the terminal product is also small.
  • a multi-frequency terminal antenna supporting LTE will be described as an example.
  • the antenna in this embodiment includes: a primary antenna and a secondary antenna. It should be noted that the design principles of the two antennas are the same as those in the prior art, that is, the primary and secondary antennas are commonly used monopoles, IFAs, or Antennas such as PIFA; two built-in antenna brackets. It should be noted that each antenna bracket is the same as the existing antenna bracket.
  • the antenna can be fixed on the bracket using steel sheet or FPC; two or more sets
  • the matching circuit, each set of matching circuits corresponds to one antenna working frequency band, and the plurality of sets of matching circuits can enable the antenna to realize a wide frequency band.
  • the preferred embodiment provides a design scheme of a multi-frequency terminal antenna supporting LTE.
  • the switching of the matching circuit is performed by using two or more sets of matching circuits and introducing a switch between the antenna matching circuit and the antenna feed point.
  • each set of matching circuits enables the antennas to operate in different frequency bands, and the combination can make the antenna work in a wide frequency band.
  • the following is an example of a global analog terminal antenna supporting LTE bandl3.
  • the working frequency band of LTE band 13 is 746MHz ⁇ 787MHz, and other modes of global mode include GSM/EVDO/UMTS.
  • EVDO and Universal Mobile Telecommunications System (UMTS) support diversity reception, and its working frequency band is 824MHz ⁇ 960MHz and 1710MHz ⁇ 2170MHz. Therefore, for the antenna design, it is necessary to design two antennas with operating bands of 746MHz ⁇ 960MHz and 1710MHz ⁇ 2170MHz, which makes the antenna design difficult, especially the bandwidth at the low frequency end is difficult to achieve. If the antenna is designed in the prior art, the required PCB size and antenna area are quite large, which is obviously unrealistic for the pursuit of a small-sized terminal product.
  • the antenna design scheme can be used to make the main antenna and the sub-antenna respectively on a conventional bracket, and the antenna adopts a general type of antenna such as Monopole, IFA or PIFA, and the antenna has a resonance at the high frequency end and the low frequency end. And a certain bandwidth, but the bandwidth at the low end is difficult to meet 746MHz ⁇ 960MHz requirements.
  • FIG. 2 is a schematic diagram of an antenna design scheme using two sets of matching circuits according to a preferred embodiment of the present invention, as shown in FIG. 2, wherein the matching circuit 1 operates the antenna at 746 Mz ⁇ 787 MHz, and the matching circuit 2 operates the antenna at 824 MHz.
  • FIG. 3 is a schematic diagram of an antenna design scheme using three sets of matching circuits according to a preferred embodiment of the present invention, as shown in FIG.
  • the matching circuit 1 operates the antenna at 746 Mz ⁇ 787 MHz
  • the matching circuit 2 operates the antenna at 824 MHz ⁇ 894 MHz
  • the matching circuit 3 operates the antenna at 925 MHz to 960 MHz and 1710 MHz to 2170 MHz.
  • the three sets of matching circuits are switched by switches, and there is no special requirement for the type of switches, which is located between the antenna matching circuit and the antenna feed point. This also allows the antenna to operate in the 746MHz ⁇ 960MHz and 1710MHz ⁇ 2170MHz frequency bands.
  • terminal antennas that can work simultaneously in the 2G, 3G, and 4G modes (the 2G system mainly includes GSM, the 3G system mainly includes EVDO and UMTS, and the 4G system mainly includes LTE) are provided to meet the requirements.
  • the MIMO receiving performance of the 4G system and the diversity receiving function of the 3G system meet the requirements of the physical size of the terminal product as small as possible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

The model utility discloses a terminal antenna. The terminal antenna includes: an antenna and matching circuits, the matching circuits are at least two groups of matching circuits, which are connected with the antenna; wherein, each group of matching circuits is used to enable the antenna to work at predetermined frequency ranges. By using the model utility, the problems caused by antenna design, which is implemented by enlarging the size of PCB or abandoning some subsidiary frequency bands, in the prior art are solved; and thus it is achieved that the antenna efficiency is increased without enlarging the size of the PCB and abandoning some frequency bands.

Description

终端天线 技术领域 本实用新型涉及通信领 i或， 具体而言， 涉及一种终端天线。 背景技术 在无线宽带需求不断增加， 以及移动通信技术不断进步的情况下， 由于 长期演进（ Long-Term Evolution, 简称为 LTE )的传输能力已远超过 3G, 因 此， LTE必将在未来具有广阔的应用前景。 但是在 LTE发展初期， LTE网络 覆盖面并不是很广， 并且 LTE类终端还必须依赖于现有的 3G和 2G通讯网 络， 否则 LTE类终端的使用范围将会很小， 用户体验也将会很差。 因此， 在 LTE发展初期， LTE类的终端产品很多都要兼容 2G和 3G的工作模式， 使得 全球模的终端越来越受运营商和消费者欢迎。 但是， LTE—共有 40个频段， 其中 5个频段是 800MHz以下的， 最氐的频率达到 698MHz。 如果要兼容现 有的 2G和 3G制式，天线必须在氏频端的工作频段达到 698MHz ~ 960MHz, 即， 一共 262MHz的带宽， 而且 LTE是支持多输入多输出 （ Multiple Input Multiple Output, 简称为 MIMO )接收， 并且天线的带宽， 以及效率是和物 理尺寸成正比的， 所以要实现天线的性能， 天线的物理尺寸需要 4艮大， 终端 的尺寸也会很大。 因此， 如何设计出一种带宽很宽， 同时物理尺寸很小的天 线， 已经成为 LTE类终端产品开发的一个难题。 现有技术中， 设计天线都是根据产品的工作频段设计出一个谐振在工作 频段上的天线， 图 1是根据现有技术中天线设计的方案示意图，如图 1所示， 天线一般包括单极天线 monopole、 平面倒 F型天线（ Planer Inverted F-shaped Antenna, 简称为 PIFA ) 或倒 F型天线 （ Inverted F-shaped Antenna, 简称为 IFA ) 等类型的天线。 当带宽无法满足 LTE多频终端的要求时， 解决的措施 一般是加大 PCB的尺寸， 或者是牺牲某些次要频段的天线效率， 通过这些措 施来提升主要频段的天线效率。 但是， 上面的解决措施同时会导致一系列不 同的问题， 例如， 加大 PCB的尺寸， 将会造成产品的 ID变大， 如果前期 ID 已经被客户锁定， 那么 ID的改动将会很困难； 而如果釆用牺牲某些频段的 天线效率的方式， 结果将会使产品在实际使用的时候用户体验很差， 影响产 品的市场竟争力。 实用新型内容 本实用新型的主要目的在于提供一种终端天线， 以至少解决上述问题。 才艮据本实用新型的一个方面， 提供了一种终端天线， 包括： 天线和匹配 电路， 所述匹配电路为至少两组， 所述天线与所述至少两组的匹配电路连接， 其中， 每组匹配电路用于使所述天线工作在预定的频率范围。 优选地， 所述天线和所述至少两组匹配电路通过开关连接， 所述开关用 于切换匹配电路。 优选地，所述开关位于所述至少两组的匹配电路和所述天线的馈点之间。 优选地， 所述匹配电路为两组， 其中一组使所述天线工作在 746MHz ~ 787MHz, 另一组使所述天线工作在 824MHz ~ 960MHz和 1710MHz ~ 2170MHz。 优选地， 所述匹配电路为三组， 第一组使所述天线工作在 746MHz ~ 787MHz, 第二组使所述天线工作在 824MHz ~ 894MHz, 第三组使所述天线 工作在 925MHz ~ 960MHz和 1710MHz ~ 2170MHz。 优选地， 所述天线包括主天线和副天线， 其中， 所述主天线和所述副天 线分别设置在支架上。 优选地， 所述天线的类型为以下至少之一： 单极天线 Monopole、 倒 F 型天线 IFA、 平面倒 F型天线 PIFA。 通过本实用新型，解决了现有技术中通过加大 PCB的尺寸或者是牺牲某 些次要频段进行天线设计所带来的问题，进而达到了无须加大 PCB的尺寸和 牺牲某些频段来提高天线效率的效果。 附图说明 此处所说明的附图用来提供对本实用新型的进一步理解， 构成本申请的 一部分， 本实用新型的示意性实施例及其说明用于解释本实用新型， 并不构 成对本实用新型的不当限定。 在附图中： 图 1是根据现有技术中天线设计的方案示意图； 图 2是才艮据本实用新型优选实施例的釆用两组匹配电路的天线设计方案 示意图； 图 3是根据本实用新型优选实施例的釆用三组匹配电路的天线设计方案 示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本实用新型。需要说明的是， 在不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 在本实用新型实施例中， 提供了一种终端天线， 包括： 天线和匹配电路， 其中， 匹配电路为至少两组， 天线与至少两组的匹配电路连接， 每组匹配电 路用于使天线工作在预定的频率范围。 通过该天线， 增加了匹配电路的数量， 相比于现有技术无须加大 PCB的 尺寸和牺牲某些频段就提高了天线效率。 优选的， 天线和至少两组匹配电路通过开关连接， 开关用于切换匹配电 路。 需要说明的是， 连接天线和至少两组匹配电路的不需要必须为开关， 也 可以是其他的实施方式， 只要能够达到切换匹配电路的目的即可。 优选的， 如果使用开关， 那么， 该开关较优的可以位于至少两组的匹配 电路和天线的馈点之间。 优选的， 匹配电路为两组， 其中一组使天线工作在 746MHz ~ 787MHz, 另一组使天线工作在 824MHz ~ 960MHz和 1710MHz ~ 2170MHz。 优选的， 匹配电路为三组， 第一组使天线工作在 746MHz ~ 787MHz, 第 二组使天线工作在 824MHz ~ 894MHz, 第三组使天线工作在 925MHz ~ 960MHz和 1710MHz ~ 2170MHz。 通过本实用新型实施例，解决了现有技术中存在的相关问题，实现了 LTE 多模终端天线的性能、 同时终端产品的尺寸 4艮小。 而且无须加大 PCB的尺寸 和牺牲某些频段的天线效率， 从而增强了产品的市场竟争力。 以下以支持 LTE的多频终端天线为例进行说明。 本实施例中的天线包括： 主天线、 副天线， 需要说明的是， 上述两个天 线的设计方法原理与现有技术是一样的， 即主、 副天线均是常用的单极子、 IFA或 PIFA等天线； 两个内置天线支架， 需要说明的是， 每个天线支架与现 有的天线支架是一样的， 天线可以使用钢片或者 FPC的形式固定在支架上； 两组或两组以上的匹配电路， 每组匹配电路对应一个天线工作频带， 多组匹 配电路可以使天线实现很宽的频带， 需要说明的是， 现有技术中仅釆用一组 匹配电路， 这样的实施方式使得在天线带宽无法实现的情况下， 天线的调试 灵活度有限； 两个开关， 在主、 副天线的匹配电路和天线馈点之间引入开关， 使用开关进行匹配电路的切换， 使天线实现宽频带。 在本实施例中， 可以在天线不发生变^ ^的情况下， 使用两组或多组匹配 电路， 每组匹配电路使天线工作于不同的频段， 上述匹配电路组合起来可以 使天线有很宽的工作频段。 从而实现了天线的超宽频带， 而且在实现同样的 天线性能的条件下， 天线尺寸比现有技术下的天线尺寸小很多， 增强了产品 的市场竟争力。 下面是本实用新型的另一个优选实施例。 本优选实施例提供了一种支持 LTE的多频终端天线的设计方案， 通过使用两组或多组匹配电路， 并且在天 线匹配电路和天线馈点之间引入开关， 进行匹配电路的切换。 其中， 每组匹 配电路使天线工作于不同的频段， 组合后可以使天线工作在一个艮宽的频带 内。 下面以支持 LTE bandl3的全球模终端天线为例进行说明。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication hub or, in particular, to a terminal antenna. BACKGROUND OF THE INVENTION With the increasing demand for wireless broadband and the continuous advancement of mobile communication technologies, since the transmission capability of Long-Term Evolution (LTE) has far exceeded 3G, LTE is bound to have a broad future. Application prospects. However, in the early stage of LTE development, the coverage of LTE networks is not very wide, and LTE-type terminals must also rely on existing 3G and 2G communication networks. Otherwise, the scope of use of LTE-type terminals will be small and the user experience will be poor. . Therefore, in the early stage of LTE development, many LTE terminal products are compatible with 2G and 3G working modes, making global mode terminals more and more popular with operators and consumers. However, LTE has a total of 40 frequency bands, of which 5 are below 800 MHz and the most frequent are 698 MHz. If it is compatible with the existing 2G and 3G standards, the antenna must reach 698MHz ~ 960MHz in the working frequency band at the C-band, that is, a total of 262MHz bandwidth, and LTE supports multiple input multiple output (MIMO) reception. And the bandwidth of the antenna, and the efficiency is proportional to the physical size. Therefore, to achieve the performance of the antenna, the physical size of the antenna needs to be 4 inches, and the size of the terminal is also large. Therefore, how to design an antenna with a wide bandwidth and a small physical size has become a problem in the development of LTE terminal products. In the prior art, the antenna is designed to design an antenna that is resonant in the working frequency band according to the working frequency band of the product. FIG. 1 is a schematic diagram of the antenna design according to the prior art. As shown in FIG. 1 , the antenna generally includes a monopole. An antenna such as an antenna monopole, a Planer Inverted F-shaped Antenna (PIFA) or an Inverted F-shaped Antenna (IFA). When the bandwidth cannot meet the requirements of the LTE multi-frequency terminal, the solution is generally to increase the size of the PCB, or to sacrifice the antenna efficiency of some secondary frequency bands, and to improve the antenna efficiency of the main frequency band by these measures. However, the above solutions will lead to a series of different problems. For example, increasing the size of the PCB will cause the ID of the product to become larger. If the previous ID has been locked by the customer, the ID change will be difficult; If the method of sacrificing antenna efficiency in certain frequency bands is used, the result will be a poor user experience in actual use, which will affect the market competitiveness of the product. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a terminal antenna to at least solve the above problems. According to an aspect of the present invention, a terminal antenna is provided, including: an antenna and a matching circuit, wherein the matching circuit is at least two groups, and the antenna is connected to the matching circuit of the at least two groups, wherein each A group matching circuit is used to operate the antenna at a predetermined frequency range. Preferably, the antenna and the at least two sets of matching circuits are connected by a switch for switching the matching circuit. Preferably, the switch is located between the matching circuit of the at least two groups and the feed point of the antenna. Preferably, the matching circuit is two groups, one of which enables the antenna to operate at 746 MHz to 787 MHz, and the other group enables the antenna to operate at 824 MHz to 960 MHz and 1710 MHz to 2170 MHz. Preferably, the matching circuit is three groups, the first group enables the antenna to operate at 746 MHz to 787 MHz, the second group enables the antenna to operate at 824 MHz to 894 MHz, and the third group enables the antenna to operate at 925 MHz to 960 MHz and 1710MHz ~ 2170MHz. Preferably, the antenna includes a primary antenna and a secondary antenna, wherein the primary antenna and the secondary antenna are respectively disposed on a bracket. Preferably, the type of the antenna is at least one of the following: a monopole antenna Monopole, an inverted F antenna IFA, and a planar inverted F antenna PIFA. The utility model solves the problems brought by the antenna design in the prior art by increasing the size of the PCB or sacrificing certain secondary frequency bands, thereby achieving the requirement of not increasing the size of the PCB and sacrificing certain frequency bands. The effect of antenna efficiency. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, FIG. Improperly qualified. In the drawings: FIG. 1 is a schematic diagram of a scheme of an antenna design according to prior art; 2 is a schematic diagram of an antenna design of two sets of matching circuits according to a preferred embodiment of the present invention; FIG. 3 is a schematic diagram of an antenna design of three sets of matching circuits for use in accordance with a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In an embodiment of the present invention, a terminal antenna is provided, including: an antenna and a matching circuit, wherein the matching circuit is at least two groups, and the antenna is connected with at least two sets of matching circuits, and each group of matching circuits is used to make the antenna work. In the predetermined frequency range. Through the antenna, the number of matching circuits is increased, and the antenna efficiency is improved compared to the prior art without increasing the size of the PCB and sacrificing certain frequency bands. Preferably, the antenna and at least two sets of matching circuits are connected by a switch for switching the matching circuit. It should be noted that the connection antenna and the at least two sets of matching circuits do not need to be switches, and may be other embodiments as long as the purpose of switching the matching circuit can be achieved. Preferably, if a switch is used, the switch may be preferably located between at least two sets of matching circuits and feed points of the antenna. Preferably, the matching circuit is two groups, one of which enables the antenna to operate at 746 MHz to 787 MHz, and the other group enables the antenna to operate at 824 MHz to 960 MHz and 1710 MHz to 2170 MHz. Preferably, the matching circuit is three groups, the first group enables the antenna to operate at 746 MHz to 787 MHz, the second group enables the antenna to operate at 824 MHz to 894 MHz, and the third group enables the antenna to operate at 925 MHz to 960 MHz and 1710 MHz to 2170 MHz. Through the embodiments of the present invention, the related problems existing in the prior art are solved, and the performance of the LTE multimode terminal antenna is realized, and the size of the terminal product is also small. Moreover, it is not necessary to increase the size of the PCB and sacrifice the antenna efficiency of certain frequency bands, thereby enhancing the market competitiveness of the product. Hereinafter, a multi-frequency terminal antenna supporting LTE will be described as an example. The antenna in this embodiment includes: a primary antenna and a secondary antenna. It should be noted that the design principles of the two antennas are the same as those in the prior art, that is, the primary and secondary antennas are commonly used monopoles, IFAs, or Antennas such as PIFA; two built-in antenna brackets. It should be noted that each antenna bracket is the same as the existing antenna bracket. The antenna can be fixed on the bracket using steel sheet or FPC; two or more sets The matching circuit, each set of matching circuits corresponds to one antenna working frequency band, and the plurality of sets of matching circuits can enable the antenna to realize a wide frequency band. It should be noted that only one set of matching circuits is used in the prior art, and such an implementation manner makes the antenna When the bandwidth cannot be realized, the flexibility of debugging of the antenna is limited. Two switches introduce a switch between the matching circuit of the primary and secondary antennas and the antenna feed point, and use the switch to switch the matching circuit to make the antenna realize a wide frequency band. In this embodiment, two or more sets of matching circuits can be used in the case where the antenna does not change, and each set of matching circuits enables the antenna to operate in different frequency bands. The above matching circuits can make the antenna have a wide range. Working frequency band. Thereby, the ultra-wide band of the antenna is realized, and under the condition that the same antenna performance is realized, the antenna size is much smaller than that of the prior art, which enhances the market competitiveness of the product. The following is another preferred embodiment of the present invention. The preferred embodiment provides a design scheme of a multi-frequency terminal antenna supporting LTE. The switching of the matching circuit is performed by using two or more sets of matching circuits and introducing a switch between the antenna matching circuit and the antenna feed point. Among them, each set of matching circuits enables the antennas to operate in different frequency bands, and the combination can make the antenna work in a wide frequency band. The following is an example of a global analog terminal antenna supporting LTE bandl3.
LTE band 13的工作频段是 746MHz ~ 787MHz, 全球模的其它制式还包 括 GSM/EVDO/UMTS， 其中， EVDO和通用移动通信系统（ Universal Mobile Telecommunications System, 简称为 UMTS ) 支持分集接收， 其工作频段是 824MHz ~ 960MHz和 1710MHz ~ 2170MHz。 因此， 对于天线设计来说， 需 要设计两个工作频带为 746MHz ~ 960MHz和 1710MHz ~ 2170MHz的天线， 导致天线设计的难度很大， 特别是低频端的带宽很难实现。 如果以现有技术 去设计该天线， 需要的 PCB尺寸和天线面积相当的大， 对于追求小尺寸的终 端产品来说显然是不现实的。 在本实施例中， 天线设计方案可以将主、 副天线分别做在常规的支架上, 天线釆用一般的 Monopole、 IFA或 PIFA等类型的天线， 天线在高频端和低 频端均有一个谐振和一定的带宽， 但是低频端的带宽很难满足 746MHz ~ 960MHz的要求。 也就是难以同时实现两个带宽的性能， 即， 如果天线要实 现 LTE700MHz的性能， 那么 824MHz ~ 960MHz的性能将艮难实现； 反之， 天线如果要实现 824MHz ~ 960MHz的性能，那么 LTE700MHz的性能将艮难 实现。 图 2是才艮据本实用新型优选实施例釆用两组匹配电路的天线设计方案示 意图， 如图 2所示， 其中匹配电路 1使天线工作在 746Mz ~ 787MHz, 匹配 电路 2使天线工作在 824MHz ~ 960MHz和 1710MHz ~ 2170MHz, 两组匹配 电路通过开关进行切换， 需要说明的是， 对于开关的种类没有特殊要求， 开 关位于天线匹配电路和天线馈点之间。 这样通过开关对两组匹配电路进行切 换就可以实现天线工作于 746MHz ~ 960MHz和 1710MHz ~ 2170MHz的频段 内，从而实现了 LTE MIMO天线的超宽带宽，达到了天线的尺寸很小的效果。 图 3是根据本实用新型优选实施例釆用三组匹配电路的天线设计方案示 意图， 如图 3所示， 其中匹配电路 1使天线工作在 746Mz ~ 787MHz, 匹配 电路 2使天线工作在 824MHz ~ 894MHz,匹配电路 3使天线工作在 925MHz ~ 960MHz和 1710MHz ~ 2170MHz, 三组匹配电路通过开关进行切换， 同样对 于开关种类没有特殊要求， 其位于天线匹配电路和天线馈点之间。 这样也可 以使天线工作于 746MHz ~ 960MHz和 1710MHz ~ 2170MHz的频段内。 综上所述， 通过上述实施例， 提供了可同时工作在 2G、 3G和 4G制式 下 （ 2G制式主要包括 GSM、 3G制式主要包括 EVDO和 UMTS、 4G制式主 要包括 LTE ) 的终端天线， 来满足 4G制式的 MIMO接收性能， 以及 3G制 式的分集接收功能要求， 同时满足终端产品的物理尺寸尽可能小的要求。 显然， 本领域的技术人员应该明白， 上述本实用新型的各种设计及实现 方案， 是对本实用新型的目的、 技术方案和优点进行了进一步详细说明， 所 应理解的是， 以上所述仅为本实用新型的实施例而已， 并不用于限制本实用 新型， 凡在本实用新型的精神和原则之内， 所作的任何修改、 等同替换、 改 进等， 均应包含在本实用新型的保护范围之内。 以上所述仅为本实用新型的优选实施例而已，并不用于限制本实用新型， 对于本领域的技术人员来说， 本实用新型可以有各种更改和变化。 凡在本实 用新型的精神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含 在本实用新型的保护范围之内。 The working frequency band of LTE band 13 is 746MHz ~ 787MHz, and other modes of global mode include GSM/EVDO/UMTS. Among them, EVDO and Universal Mobile Telecommunications System (UMTS) support diversity reception, and its working frequency band is 824MHz ~ 960MHz and 1710MHz ~ 2170MHz. Therefore, for the antenna design, it is necessary to design two antennas with operating bands of 746MHz ~ 960MHz and 1710MHz ~ 2170MHz, which makes the antenna design difficult, especially the bandwidth at the low frequency end is difficult to achieve. If the antenna is designed in the prior art, the required PCB size and antenna area are quite large, which is obviously unrealistic for the pursuit of a small-sized terminal product. In this embodiment, the antenna design scheme can be used to make the main antenna and the sub-antenna respectively on a conventional bracket, and the antenna adopts a general type of antenna such as Monopole, IFA or PIFA, and the antenna has a resonance at the high frequency end and the low frequency end. And a certain bandwidth, but the bandwidth at the low end is difficult to meet 746MHz ~ 960MHz requirements. That is, it is difficult to achieve the performance of two bandwidths at the same time, that is, if the antenna is to achieve the performance of LTE 700 MHz, the performance of 824 MHz ~ 960 MHz will be difficult to achieve; conversely, if the antenna is to achieve the performance of 824 MHz ~ 960 MHz, the performance of LTE 700 MHz will be Difficult to achieve. 2 is a schematic diagram of an antenna design scheme using two sets of matching circuits according to a preferred embodiment of the present invention, as shown in FIG. 2, wherein the matching circuit 1 operates the antenna at 746 Mz ~ 787 MHz, and the matching circuit 2 operates the antenna at 824 MHz. ~ 960MHz and 1710MHz ~ 2170MHz, the two sets of matching circuits are switched by switches. It should be noted that there is no special requirement for the type of switch, and the switch is located between the antenna matching circuit and the antenna feed point. In this way, by switching the two sets of matching circuits through the switch, the antenna can work in the frequency bands of 746MHz ~ 960MHz and 1710MHz ~ 2170MHz, thereby realizing the ultra-wide bandwidth of the LTE MIMO antenna and achieving the small size of the antenna. 3 is a schematic diagram of an antenna design scheme using three sets of matching circuits according to a preferred embodiment of the present invention, as shown in FIG. 3, wherein the matching circuit 1 operates the antenna at 746 Mz ~ 787 MHz, and the matching circuit 2 operates the antenna at 824 MHz ~ 894 MHz. The matching circuit 3 operates the antenna at 925 MHz to 960 MHz and 1710 MHz to 2170 MHz. The three sets of matching circuits are switched by switches, and there is no special requirement for the type of switches, which is located between the antenna matching circuit and the antenna feed point. This also allows the antenna to operate in the 746MHz ~ 960MHz and 1710MHz ~ 2170MHz frequency bands. In summary, through the above embodiments, terminal antennas that can work simultaneously in the 2G, 3G, and 4G modes (the 2G system mainly includes GSM, the 3G system mainly includes EVDO and UMTS, and the 4G system mainly includes LTE) are provided to meet the requirements. The MIMO receiving performance of the 4G system and the diversity receiving function of the 3G system meet the requirements of the physical size of the terminal product as small as possible. Obviously, those skilled in the art should understand that the various designs and implementations of the present invention are further described in detail, the technical solutions and advantages of the present invention. It should be understood that the above is only The embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalents, improvements, etc., which are within the spirit and principles of the present invention, should be included in the scope of the present invention. Inside. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

权 利 要 求 书 一种终端天线， 包括： 天线和匹配电路，  A terminal antenna comprising: an antenna and a matching circuit,
所述匹配电路为至少两组， 所述天线与所述至少两组的匹配电路 连接， 其中， 每组匹配电路用于使所述天线工作在预定的频率范围。 才艮据权利要求 1所述的终端天线， 其中， 所述天线和所述至少两组匹 配电路通过开关连接， 所述开关用于切换匹配电路。 根据权利要求 2所述的终端天线， 其中， 所述开关位于所述至少两组 的匹配电路和所述天线的馈点之间。 才艮据权利要求 1至 3中任一项所述的终端天线， 其中， 所述匹配电路 为两组， 其中一组使所述天线工作在 746MHz-787MHz, 另一组使所 述天线工作在 824MHz-960MHz和 1710MHz-2170MHz。 才艮据权利要求 1至 3中任一项所述的终端天线， 其中， 所述匹配电路 为三组， 第一组使所述天线工作在 746MHz-787MHz, 第二组使所述 天线工作在 824MHz-894MHz, 第三组使所述天线工作在  The matching circuit is at least two groups, and the antenna is connected to the at least two sets of matching circuits, wherein each set of matching circuits is used to operate the antenna in a predetermined frequency range. A terminal antenna according to claim 1, wherein said antenna and said at least two sets of matching circuits are connected by a switch for switching a matching circuit. The terminal antenna according to claim 2, wherein said switch is located between said matching circuit of said at least two groups and a feed point of said antenna. The terminal antenna according to any one of claims 1 to 3, wherein the matching circuit is two groups, one of which causes the antenna to operate at 746 MHz to 787 MHz, and the other group enables the antenna to operate at 824MHz-960MHz and 1710MHz-2170MHz. The terminal antenna according to any one of claims 1 to 3, wherein the matching circuit is three groups, the first group is such that the antenna operates at 746 MHz-787 MHz, and the second group enables the antenna to operate at 824MHz-894MHz, the third group makes the antenna work at
925MHz-960MHz和 1710MHz-2170MHz。 根据权利要求 1至 3中任一项所述的终端天线， 其中， 所述天线包括 主天线和副天线， 其中， 所述主天线和所述副天线分别设置在支架上。 根据权利要求 1至 3中任一项所述的终端天线， 其中， 所述天线的类 型为以下至少之一： 单极天线 Monopole、 倒 F型天线 IFA、 平面倒 F 型天线 PIFA。 925MHz-960MHz and 1710MHz-2170MHz. The terminal antenna according to any one of claims 1 to 3, wherein the antenna includes a primary antenna and a secondary antenna, wherein the primary antenna and the secondary antenna are respectively disposed on a bracket. The terminal antenna according to any one of claims 1 to 3, wherein the type of the antenna is at least one of the following: a monopole antenna Monopole, an inverted F antenna IFA, and a planar inverted F antenna PIFA.
PCT/CN2011/071268 2010-12-15 2011-02-24 Terminal antenna WO2012079305A1 (en)

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CN103094671A (en) * 2011-10-28 2013-05-08 成都高新区尼玛电子产品外观设计工作室 Compatible type radio frequency antenna circuit
CN102637964A (en) * 2012-04-28 2012-08-15 上海华勤通讯技术有限公司 Antenna system and mobile terminal thereof
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