CN102714347A - 可调节天线 - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
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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
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/14—Length of element or elements adjustable
- H01Q9/145—Length of element or elements adjustable by varying the electrical length
Abstract
一种特别意图用于移动终端的可调节单极天线。在沿单极辐射器(310)的大约中途位置,存在调节点(AP),导线(315)从该调节点分岔到天线的调节电路(340)。调节电路包括开关(SW)和可由开关选择的连接到地(GND)的可供选择的电抗元件(X1-XN)。当电抗元件被改变时,整个辐射器的电长度和谐振频率改变,在这种情形下,相应的操作频带移动。如果天线被制造成双频带天线,上述操作频带是它们中较低的一个。例如,较高操作频带又是基于由相同辐射器导线和可能的单独寄生辐射器(320)所实现的辐射缝隙(SL1,SL2)。低于1GHz频率的天线的操作频带能够在比相应的已知天线中更宽的范围内移动。
Description
技术领域
本发明涉及特别意图用于移动终端的可调节单极天线。
背景技术
在本描述中,天线的可调节性是指天线的一个或多个谐振频率可以被电地改变。目的是围绕谐振频率的天线的操作频带始终覆盖每次操作所需要的频率范围。对于可调节性的需求有不同原因。当诸如移动终端的便携无线电设备尺寸非常小时,可用于该设备的天线的空间相应地小,这导致天线的带宽相对窄。然后,由于终端意图在具有彼此相对接近的频率范围的若干系统中运行,覆盖超过一个无线电系统所使用的频率范围是困难的或不可能的。相应地,确保符合单一系统的发射和接收频带中的规范的功能可能变得更加困难。如果系统使用子带划分,如果天线的谐振频率能够在每次所使用的子带中被调谐,从无线电连接质量的角度来看,是有优势的。
在双频带天线中,所述问题尤其涉及较低的操作频带,从而其比较高操作频带更难以达到足够宽。在实践中,常常必须覆盖由系统GSM850和GSM900(全球移动通信系统)一起所使用的频率范围,即824-960 MHz频率范围。而且,也在所谓的LTE系统(长期演进)中运行的设备正在被引入市场。在LTE中,标准频带已经在频率范围698-798MHz内指定,这将天线的较低操作频带的总范围加宽至698-960MHz。然而,非常需要的额外空间对于天线而言是不可用的。因为这些原因,本描述主要涉及较低操作频带的实施。
在本发明中,通过开关来执行天线的调节。出于所述目的而使用开关本身是众所熟知的,例如图1和2的解决方案。
在图1中,从公开WO 2007/012697中已知存在一种布置,其中,将开关用于移动天线的操作频带。该天线是平面型,并且已经绘制了从辐射平面的上方或侧面看的视图。可以看出,无线电设备的电路板PCB处于辐射平面110之下,该板的导电上表面是信号接地GND,并且也充当天线的接地平面。天线的短路导线(conductor)在短路点SP处连接辐射平面,并且馈送导线在馈送点FP处连接辐射平面。此外,天线调节电路140的导线在调节点AP处电连接辐射平面。所有这三个点位于辐射平面的同一长侧,短路点位于它们之间。天线具有较低和较高操作频带。较低操作频带是基于由整个辐射平面110和接地平面构成的谐振器,并且较高操作频带是基于缝隙辐射器,其缝隙SLT从辐射平面的边缘开始,在调节点AP旁边。
天线的调节电路140被示出为电路图。调节电路包括多路开关SW和电抗结构部件。将多路开关的公共端子或输入连接到辐射平面的调节点AP。开关具有两个换向(change-over)端子或输出,其中一个通过串联电容器被连接至在其对端短路的短传输线(short transmission line)。开关的另一输出被连接至在其对端开路的另一短传输线。改变开关状态改变了天线的谐振频率,从而改变了其操作频带的位置。调节电路140被设计成使得当辐射器被连接至短路传输线时,从辐射器的角度看,在较低操作频带的频率下整个调节电路是非常短的短路传输线。这意味着低阻抗。在较高操作频带的频率下,调节电路被视为具有大约四分之一波长的长度的短路传输线,这意味着高阻抗。当将辐射器连接至开路传输线时,从辐射器看,在较低操作频带的频率下整个调节电路是非常短的开路传输线,这意味着高阻抗。在较高操作频带的频率下,调节电路被视为具有大约四分之一波长的长度的开路传输线,这意味着低阻抗。除了由于调节电路的设计,也由于较之较低操作频带,较高操作频带处于大约双倍频率的事实,导致这些变化。
当开关输出从短路线变为开路线时,阻抗改变导致较低操作频带向下移动,并且较高操作频带向上移动。通过适当地选择短路点SP和调节点AP之间的电距离来设置移动的长度。在前者的状态中,较低操作频带旨在覆盖EGSM(扩展GSM)的频率范围880-960 MHz,并且较高操作频带旨在覆盖GSM1800系统的频率范围1710-1880 MHz。在开关的后者状态中,较低操作频带旨在覆盖GSM850系统的频率范围824-894 MHz,并且较高操作频带旨在覆盖GSM1900系统的频率范围1850-1990 MHz。然而,如果由于空间缺乏,例如,天线的高度可能至多4mm,则将不能实现这些目的。例如,在这种情形中,调节电路必须被放大,以使得较低操作频带每次能够仅被设置在GSM850系统的发射或接收频带。然而,不利的结果是,由于切换损耗增加,天线结构的效率下降。
在图1的解决方案中,较高操作频带的足够宽度可能需要向该结构中添加寄生元件。在这种情形中,在辐射器和电路板之间的触点总数将是四个,这意味着较高的生产成本。
图2示出了从公开WO 2007/042615已知的包含开关的布置。无线电设备的电路板PCB的一部分如图中所示。该天线是ILA类型(倒置L天线),并且其具有一个频带。其单极辐射器210是板状的硬片金属条,其被连接至位于电路板角落附近的馈送点FP处的天线馈送导线FC。辐射器从该点首先指向板外边的电路板端部的边缘上方并转向,然后,仍然以端部方向,与电路板的上表面平齐。在电路板上,存在信号接地GND,其充当天线的接地平面,与辐射器210存在一定距离。在电路板上,在辐射器侧的端部,存在天线的调节电路240。调节电路在电路板上被标记为虚线圈出的区域,并且在侧视图中被示出为框图。从该图可以看出,调节电路已经连接在天线馈送导线FC和信号接地GND之间。调节电路包括LC电路、多路开关SW和三个可供选择的(alternative)电抗结构部件X1、X2、X3。LC电路在其一端已经连接到馈送导线,并且在其另一端连接到开关输入。其目的是削弱在开关中产生的谐波频率分量,并且充当开关的ESD保护器(静电放电)。开关SW具有三个输出,每次开关输入能够被连接至其中之一。开关的每个输出已经被固定连接至所述电抗结构部件之一,其存在相对信号接地的电抗。通过控制开关进行的电抗转换改变了天线的谐振频率,且从而改变了其操作频带的位置。从而,在该情形中,该天线的操作频带具有三个可选位置。
图2中的解决方案的劣势是,良好的频带特性和充足的效率需要辐射器和接地平面GND之间存在显著长的距离。这又意味着,在这种情形中,对于天线的空间要求也比期望的严格。如果只能使用较小空间,操作频带的移动范围可能仍太小。
发明内容
本发明的目标是通过新的且有利的方式,实现小尺寸的可调节天线。根据本发明的天线的特征在独立权利要求1中予以说明。根据本发明的天线组件特征在独立权利要求5中予以说明。本发明的一些有利实施例在其他权利要求中给出。
本发明的基本构思如下:将天线实现为单极型。在沿着其辐射器导线的大约中途位置,存在调节点,导线从该点分岔至天线的调节电路。调节电路包括开关和可由开关选择的连接到地的可供选择的电抗元件。当电抗元件被改变时,整个辐射器的电长度和谐振频率改变,在这种情形下,相应的操作频带移动。如果天线被制成双频带天线,上述操作频带是它们中较低的一个。例如,较高操作频带又是基于通过相同辐射器导线和可能的单独寄生辐射器实施的辐射缝隙。
本发明的优势是,低于频率1GHz的天线的操作频带可以在比相应的已知天线中的范围更宽的范围内移动。这是由于天线的调节点位于在距离其馈送端的特定最小距离处的单极辐射器中。本发明的另一优势是,在无线电设备内的天线所需要的空间较小。
附图说明
下文具体描述本发明。在描述中,将参考附图,其中:
图1呈现了根据现有技术的可调节天线的示例,
图2呈现了根据现有技术的可调节天线的第二示例,
图3呈现了根据本发明的可调节天线的示例,
图4呈现了根据本发明的天线的调节电路的示例,
图5呈现了根据本发明的可调节天线的第二示例,以及
图6呈现了根据本发明的天线的频带特性的示例。
具体实施方式
已经结合现有技术的描述对图1和2进行了描述。
在图3中,存在根据本发明的天线的一个示例。天线位于无线电设备的电路板PCB的一端。辐射导线是电介质天线框FRM的导电涂层,此处,电介质天线框FRM是具有相对薄的壁的盒子。框FRM和辐射导线构成了天线组件300,其被附着在接地平面GND所位于的电路板的表面上。在图中,为了清楚起见,将天线组件绘制成与电路板分开。
在示例中,天线具有两个操作频带,其较低的一个基于单极辐射器310的导线的谐振。天线的馈送点FP位于单极辐射器310的一端,此处,该端被称为第一端。中间导线315从单极辐射器分岔到天线的调节电路340。在本描述中和权利要求中,分岔点被称为天线的调节点AP。调节电路位于天线框FRM的内部空间中的电路板PCB上。因此,中间导线315的一部分在电路板上。调节点将所讨论的辐射导线分成两部分,第一部分311在第一端和调节点之间,并且第二部分312在调节点和尾端之间。
接地平面的边缘在天线组件300的旁边。可替换地,至少在某种程度上,接地平面能够扩展到天线组件下面。
调节电路340原理上与图2中的电路类似。因此,其包括多路开关SW和在其每个换向端子和接地平面或接地GND之间的电抗元件X1-XN。将开关的公共端子通过充当ESD保护器的LC电路,连接至所述调节点AP。因此,取决于开关的状态,每次一个电抗元件是在调节点和接地之间的电路的部分。通过控制开关而改变电抗元件,改变了该天线的谐振频率,其对应于较低操作频带,从而改变该操作频带的位置。
在本发明中重要的是,调节点AP不正好处于辐射导线的第一端或尾端。在图3中,调节点位于大约沿辐射器导线的中途位置。更一般而言,可以说,沿着辐射导线的中间线测量的调节点与馈送点FP的距离为 ,其中,是中间线的长度。在这种情形中,使得调节的效果较好,即,使得操作频带的移动范围足够宽。换言之,最优点自然取决于该天线被制造用于何种设备以及其本身由何种结构制造的情况。当设计操作频带的移动步骤时,除了调节点的位置以外,这些参数是电抗元件的电抗、中间导线315的长度和宽度以及调节电路的位置。而且,在所述LC电路中的线圈的电感可以被用作设计参数。
为了实现天线的较高操作频带,单极辐射器310已经被成形为使得其中有两个缝隙辐射器。单极辐射器的第一部件311从在天线组件300的第一端附近的馈送点FP升起,穿过框FRM的侧表面至其上表面,在那里形成一个图案,返回侧表面,然后,再次到达朝向调节点AP的上表面。具有U形状的第一缝隙SL1处于第一部件的连续部分之间。单极辐射器的第二部件312从调节点开始,沿着框的上表面的边缘延伸到天线组件的第二端,在那里转向头的方向,然后,在头表面的一侧上并且进一步在其起始点或者调节点AP附近的所述侧表面上继续。第二缝隙SL2处于第二部件312的连续部分之间。第一和第二缝隙被设计成使得在它们中激发不同频率的振荡,不过这两个频率仍处于较高操作频带的范围内。根据前文的解释,在图3的示例中,调节点AP位于第一缝隙SL1所处的辐射器区域和第二缝隙SL2所处的区域之间。
图3中所示的天线还包含寄生元件320,其是在天线组件的第一端处的导线条。将寄生元件从位于电路板PCB上的馈送点FP附近的短路点SP连接至接地平面GND。寄生元件的起始端和单极辐射器的第一部件的起始端彼此接近,以便它们之间存在显著的电磁耦合。例如,通过适当的设计,能够在寄生元件中激发在较高操作频带中的频率下的振荡。
图4示出了根据本发明的天线中的调节电路的示例。在调节电路440中的可供选择的电抗元件的数目是四个。第一电抗元件是电容器C41,于是其在多路开关SW的第一换向端子和信号接地或接地平面GND之间。相应地,第二“电抗元件”是开路电路,从而表示非常高的电抗,第三电抗元件是线圈L41,并且第四电抗元件是线圈L42。与这些线圈串联的是阻塞电容器CB,以将直流电路与开关控制断开。阻塞电容器的电容如此之高,例如,100pF,以至于它们在天线的使用频率下几乎构成了短路。
在开关SW的公共端子和引向调节点AP的中间导线415之间,存在电容器C42,并且在该电容器的在调节点一侧上的端部与接地平面之间存在线圈L43。LC电路C42-L43充当开关的ESD保护器。此外,电容器C42充当阻塞电容器,防止形成从开关的控制通过线圈L43或辐射器而接地的直流电路。通过控制信号CTR来设置开关的状态。
图5示出了根据本发明的天线的另一示例。与图3的示例中一样,天线包括单极辐射器510、寄生元件520、中间导线515、调节电路540和接地平面GND。中间导线在调节点AP从单极辐射器分岔,其距离辐射导线的第一端和尾端相对较远。在这种情形中,单极辐射器、中间导线和寄生元件是薄电介质板的导电涂层,并且它们一起构成柔性天线电路板ACB。天线电路板被附着在无线电设备的外罩COV的内表面上,并且其遵循罩子的形状。在天线电路板上的接触垫通过与充当中间导线的一部分的触点CT类似的触点,被连接到无线电设备的电路板PCB。在这个示例中,调节电路540位于电路板PCB的相对侧上。接地平面GND是电路板PCB的导电上表面的一部分。
图6示出了根据本发明的天线的频带特性的示例。该被测量的原型与图3中的类似,并且调节电路与图4中的类似。在该调节电路中,第一电抗元件C41=0.3pF,第三电抗元件L41=15nH,并且第四电抗元件L42=3.9nH。弧线61示出了当开关处于状态1中时,或其公共端子被连接至第一电抗元件时,作为频率的函数的天线的反射系数S1的波动,弧线62示出了当开关处于状态2时反射系数的波动,弧线63示出了当开关处于状态3时反射系数的波动,并且弧线64示出了当开关处于状态4时反射系数的波动。
从这些弧线可以看出,如果反射系数的值-5dB被视为用于频带的边界频率的标准,则天线的较低操作频带的总体移动是大约200MHz,并且总体带宽超过280MHz。通过这个标准,当开关处于状态1中时,较低操作频带是大约690-760MHz,当开关处于状态2时,大约735-825 MHz,当开关处于状态3时,大约800-894 MHz,并且当开关处于状态4时,大约875-975 MHz。在开关的状态3中,操作频带完全覆盖了GSM850系统的频率范围824-894 MHz,并且在状态4中时,其完全覆盖了GSM900系统的频率范围890-960 MHz。
在示例中,天线的较高操作频带是非常宽的,大约1.7-2.7 GHz,其中,2.3-2.4GHz的频率范围较差。较高操作频带是基于三个谐振:其频率大约1.8GHz的寄生元件的谐振r1、其频率大约2.2GHz的由单极辐射器形成的第二缝隙辐射器的谐振r2以及其频率大约2.6GHz的第一缝隙辐射器的谐振r3。在调节电路中的开关的状态自然也稍微影响了较高操作频带,但这种影响是不重要的。
上文已经描述了根据本发明的可调节天线。自然,其结构在细节上可能与所示的不同。天线的辐射元件的形状可能大幅度变化。在调节电路中的电抗元件的实施也可能变化。它们的至少一部分也可以是在电路板的表面上的短平面传输线。本发明不限制天线的制造方法。例如,所述天线框可以是无线电设备的外罩的一部分,或者辐射器可以在芯片型基板的表面上。本发明的构思可以在独立权利要求1和5所限定的范围内通过不同方式应用。
Claims (6)
2.根据权利要求1所述的可调节天线,其特征在于,将被设置的所述操作频带低于1 GHz频率。
3.根据权利要求1所述的可调节天线,其单极辐射器(310)构成第一(SL1)和第二(SL2)辐射缝隙以实现所述天线的较高操作频带,其特征在于,所述调节点(AP)位于所述第一辐射缝隙(SL1)所处的所述单极辐射器的区域和所述第二辐射缝隙(SL2)所处的区域之间。
4.根据权利要求1所述的可调节天线,其特征在于,将所述调节点连接至所述调节电路的中间导线(315;515)被设计成充当具有特定值的电感,以优化所述操作频带的移动。
6.根据权利要求5所述的天线组件,其特征在于,其进一步包括从其一端连接至接地平面以加宽所述天线的较高操作频带的寄生元件(320)。
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Also Published As
Publication number | Publication date |
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KR20120093911A (ko) | 2012-08-23 |
FI20096134A0 (fi) | 2009-11-03 |
US9761951B2 (en) | 2017-09-12 |
EP2497147A4 (en) | 2013-07-03 |
EP2497147A1 (en) | 2012-09-12 |
CN102714347B (zh) | 2016-08-03 |
US20130038494A1 (en) | 2013-02-14 |
WO2011055003A1 (en) | 2011-05-12 |
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