CN1091548C - 天线装置 - Google Patents

天线装置 Download PDF

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Publication number
CN1091548C
CN1091548C CN97110808A CN97110808A CN1091548C CN 1091548 C CN1091548 C CN 1091548C CN 97110808 A CN97110808 A CN 97110808A CN 97110808 A CN97110808 A CN 97110808A CN 1091548 C CN1091548 C CN 1091548C
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outer conductor
coaxial cable
radio wave
antenna
antenna element
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Expired - Lifetime
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CN97110808A
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CN1169041A (zh
Inventor
青木恒太
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; 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
    • H01Q1/245Supports; 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 means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/30Resonant antennas with feed to end of elongated active element, e.g. unipole

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

本发明揭示一种天线装置,它包含:具有第一电长度的天线单元;具有内导体和同轴外导体的同轴电缆,它们具有第二电长度,内导体的一端连接到天线馈电点上,内导体的另一端和同轴外导体的相应端耦合到无线电波电路上,第一和第二电长度确定成具有谐振,以把无线电波信号从天线单元和外导体上发射。同轴电缆的长度置成所用波长的四分之一,沿天线单元和同轴电缆的外导体产生驻波。外导体可以用作发射元件。而且同轴电缆具有弹性可以缩小天线装置。

Description

天线装置
本发明涉及一种天线装置。
所谓的套管天线用于无线电波装置的同轴型垂直型天线是已知的。图3是已有技术的套管天线的纵向剖面图。天线装置包含同轴电缆、平衡-不平衡变换器107和天线单元101,天线单元101由延伸同轴电缆的内导体102提供。同轴电缆的内导体102和外导体103在连接点104上连接到无线电波电路105上。内导体102把电源从无线电波电路105传送到天线单元101。在同轴电缆的外导体103周围,在连接点106上电连接到外导体103的同轴套设置成平衡-不平衡变换器107。平衡-不平衡变换器107形成具有外导体103的另一同轴结构,消除流过外导体103的非平衡电流。标号108表示无线电波装置的外盒。
现在描述上述已有技术的工作情况。
天线单元101的长度为所使用波长的四分之一,它用作单极天线。平衡-不平衡变换器107的长度调整成波长的四分之一,以提供所用频率的调谐条件。从连接点106看,在与连接点106的相对端上外导体103的阻抗变成元穷大,即,该点示为开路情况,所以如果把电压加到该点上,也没有电流流过外导体103。因此,这阻止了非平衡电流从天线侧流过无线电波电路的接地,防止了无线电波电路105的特性恶化。
本发明的目的是提供一种改进的天线装置。
根据本发明,提供的天线装置包含:具有第一电长度并且在其端点具有馈电点的天线单元;以及具有内导体和同轴外导体的同轴电缆,内导体和同轴的外导体具有第二电长度,内导体的一端连接到馈电点上,内导体的另一端和同轴外导体的相应端耦合到无线电波电路上,第一和第二电长度确定成具有谐振,以把无线电波信号从天线单元和外导体在传输模上发射。
在该天线装置中,第一和第二电长度基本上等于所用波长的四分之一。
在该天线装置中,同轴电缆可以是有弹性的。
通过下面结合附图的详细描述,本发明的目的和特征将变得更为明显,其中:
图1是本发明的实施例的天线装置的纵向剖面图;
图2是该实施例的示意图,它示出了沿天线装置的天线单元与外导体流动的电流幅度;
图3是已有技术的套管天线的纵向剖面图。
相同或相应的元件或部件在所有附图中用相同的标号表示。
下面描述本发明的一个实施例。
图1是本发明的一个实施例的天线装置的纵向剖面图。在图1中,标号1表示天线单元,它呈螺旋形,在馈电点2上连接到同轴电缆8的内导体3上。外导体4设置在同轴电缆的内导体3周围。即,内导体3、外导体4、内导体3和外导体4之间的绝缘体形成同轴电缆8。内导体3和外导体4在连接点5上连接到无线电波电路6上,并把电源从无线电波电路部分6传送到馈电点2上。标号7表示包括该天线装置和无线电波电路6的无线电波装置的外盒。
下面描述具有上述结构的天线装置的工作情况。
图2是该实施例的示意图,它显示了沿天线单元1和外导体4流动的电流幅度。天线单元1的电长度EL为所用频率的波长λ的四分之一,并由通过馈电点2流入到其内的电流激励。流过内导体3的电流感应出流过外导体4的电流,并在相应于馈电点2的外导体4的一端反射,然后流向连接点5。假设同轴电缆8的长度L为所用频率的波长的四分之一,由于在馈电点2的电流最大,所以流过同轴电缆8的外导体4的电流在连接点5为零。因而,沿着天线单元和同轴电缆8的外导体4上产生驻波。即,提供的电流分布示出了在馈电点2上有最大电流幅度,在与天线单元1的顶点部分相对侧上的连接点5上为最小幅度,即为零,所以提供了谐振条件。因此,双极天线由天线单元1与同轴电缆的外导体4形成,其中,同轴电缆的外导体4用作发射元件。在这种情况下,在连接点5上,同轴电缆8的外导体4内的电流为零,所以外导体4与无线电波电路6是电分离的。因而,无用的电流从天线侧流入到无线电波电路6的接地。因此,不把无线电波电路6的接地作用天线,就能不干扰无线电波电路6的特性。
如上所述,根据上述实施例,通过把同轴电缆的长度L设置成所用频率波长的四分之一,沿天线单元1和同轴电缆8的外导体4产生驻波,产生谐振条件。同轴电缆8的外导体4可以用作发射元件,所以可以防止非平衡电流流入到无线电波电路6中。而且,因为同轴电缆具有弹性,天线单元1和无线电波电路部分6可以做得彼此较近,所以可以缩小天线装置。
在上述的实施例中,假设同轴电缆8的长度L为波长的四分之一。由于同轴电缆的长度受到设置在同轴电缆周围的部件等的影响,所以该长度随其周围条件而变化。
如上所述,本实施例的天线装置包含具有电长度EL和在其端点上具有馈电点2的天线单元1;和分别具有电长度L的内导体3和同轴外导体4的同轴电缆8,内导体3的一端连接到馈电点2,内导体3的另一端与同轴外导体的相应端在连接点5上耦合到无线电波电路6,电长度EL和L确定成具有谐振,以从天线单元1和外导体4在传输模上发射无线电波信号。
电长度EL和L基本上为所用波长的四分之一。而且同轴电缆8是有弹性的。

Claims (3)

1、一种天线装置,包含:
具有第一电长度并且在其端点具有馈电点的天线单元;以及
具有内导体和同轴外导体的同轴电缆,内导体和外导体具有第二电长度,所述内导体的一端连接到所述馈电点上,所述内导体的另一端和所述同轴外导体的相应端耦合到无线电波电路上,所述第一和第二电长度确定成具有谐振,以把无线电波信号从所述天线单元和所述外导体在传输模上发射。
2、如权利要求1所述的天线装置,其特征在于,所述第一和第二电长度基本上等于所用波长的四分之一。
3、如权利要求1所述的天线装置,其特征在于,所述同轴电缆有弹性的。
CN97110808A 1996-04-26 1997-04-25 天线装置 Expired - Lifetime CN1091548C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8107758A JPH09294013A (ja) 1996-04-26 1996-04-26 アンテナ装置
JP107758/96 1996-04-26

Publications (2)

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CN1169041A CN1169041A (zh) 1997-12-31
CN1091548C true CN1091548C (zh) 2002-09-25

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US (1) US6081236A (zh)
JP (1) JPH09294013A (zh)
CN (1) CN1091548C (zh)
GB (1) GB2312561B (zh)

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FR2790153A1 (fr) * 1999-02-22 2000-08-25 Cit Alcatel Antenne a efficacite de liaison amelioree
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US6582887B2 (en) * 2001-03-26 2003-06-24 Daniel Luch Electrically conductive patterns, antennas and methods of manufacture
US7452656B2 (en) 2001-03-26 2008-11-18 Ertek Inc. Electrically conductive patterns, antennas and methods of manufacture
US7564409B2 (en) * 2001-03-26 2009-07-21 Ertek Inc. Antennas and electrical connections of electrical devices
US7394425B2 (en) * 2001-03-26 2008-07-01 Daniel Luch Electrically conductive patterns, antennas and methods of manufacture
TWI228845B (en) * 2004-03-16 2005-03-01 Arcadyan Technology Corp Cable antenna apparatus
CN1825708B (zh) * 2005-02-24 2011-03-23 智易科技股份有限公司 电缆天线装置
KR101166493B1 (ko) * 2010-03-16 2012-07-20 주식회사 메닉스 대수 주기 안테나 및 그 제조방법
DE102015004414A1 (de) * 2015-04-02 2016-10-06 Centrotherm Photovoltaics Ag Plasma-Behandlungsvorrichtung für Wafer
CN111106447B (zh) * 2018-10-26 2022-01-11 泰科电子(上海)有限公司 电子设备
RU2769306C1 (ru) * 2021-07-19 2022-03-30 Акционерное общество "Научно-технический институт "Радиосвязь" Широкополосная антенна

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Also Published As

Publication number Publication date
GB2312561B (en) 1998-04-15
CN1169041A (zh) 1997-12-31
US6081236A (en) 2000-06-27
GB9707420D0 (en) 1997-05-28
GB2312561A (en) 1997-10-29
JPH09294013A (ja) 1997-11-11

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