JP2008079246A - Multiple-frequency common monopole antenna - Google Patents

Multiple-frequency common monopole antenna Download PDF

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JP2008079246A
JP2008079246A JP2006259218A JP2006259218A JP2008079246A JP 2008079246 A JP2008079246 A JP 2008079246A JP 2006259218 A JP2006259218 A JP 2006259218A JP 2006259218 A JP2006259218 A JP 2006259218A JP 2008079246 A JP2008079246 A JP 2008079246A
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monopole antenna
monopole
antenna
frequency band
frequency
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Yasuko Kimura
泰子 木村
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Docomo Technology Inc
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Docomo Technology Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple-frequency common omni antenna suitable for a compact on-vehicle antenna. <P>SOLUTION: A multiple-frequency common monopole antenna 10 is provided with a monopole antenna 11 having one feeding point and a resonance frequency band set at a predetermined frequency band f<SB>M</SB>, and two monopole antennas 12 having the same feeding point as the above and a resonance frequency band set at a predetermined frequency band f<SB>L</SB>lower than the frequency band f<SB>M</SB>. These two monopole antennas 12 are disposed in parallel with each other with the monopole antenna 11 sandwiched therebetween so as to have an equal spacing L1 to the monopole antenna 11. The spacing L1 is set at not less than 2 mm nor more than 14 mm. The horizontal radiation pattern becomes omnidirectional after the occurrence of three resonances with the multiple-frequency common monopole antenna 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、例えば移動通信の車載用アンテナとして用いられる多周波共用モノポールアンテナに関する。   The present invention relates to a multi-frequency monopole antenna used as an in-vehicle antenna for mobile communication, for example.

現在の移動通信サービスでは、加入者容量の増加に伴い複数の周波数帯でサービスが行われている。また、複数の周波数帯をカバーするために周波数ごとにアンテナを設置するのでは、設置コストや取付けスペースが必要となるので、複数の周波数帯をカバー可能な多周波共用アンテナを用いてサービスが行われている。   In current mobile communication services, services are provided in a plurality of frequency bands as subscriber capacity increases. In addition, installing an antenna for each frequency to cover multiple frequency bands requires installation costs and installation space, so services are provided using a multi-frequency antenna that can cover multiple frequency bands. It has been broken.

モノポールアンテナやダイポールアンテナは構造が簡単であり、安価に作れるので様々な用途に使われている。しかし、これらのアンテナは狭い周波数帯しかカバーできないので、下記の特許文献１〜３に示すように１つの給電点で複数の周波数帯で共振するようにアンテナを分岐したり、無給電素子を用いたりといった技術が提案されている。
特開平２−５７００３号公報 特開昭６３−１８８０４号公報 特開２００１−１８９６２０号公報 Monopole antennas and dipole antennas are simple in structure and can be manufactured at low cost, so they are used in various applications. However, since these antennas can cover only a narrow frequency band, as shown in Patent Documents 1 to 3 below, the antennas are branched so as to resonate in a plurality of frequency bands at one feeding point, or parasitic elements are used. Techniques such as have been proposed.
Japanese Patent Laid-Open No. 2-57003 JP-A 63-18804 JP 2001-189620 A

しかし、上記の特許文献１〜３のような提案はされているものの、車載用アンテナを想定してアンテナの小型化を図る点には未だ改善の余地があり、小型で車載用アンテナとして適正な多周波共用オムニアンテナが待望されていた。   However, although proposals such as those in Patent Documents 1 to 3 have been proposed, there is still room for improvement in terms of downsizing the antenna assuming a vehicle-mounted antenna, which is small and suitable as a vehicle-mounted antenna. A multi-frequency omni-antenna has been expected.

本発明は、上記課題を解決するために成されたものであり、小型で車載用アンテナとして適正な多周波共用オムニアンテナを提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide a multi-frequency omni-directional antenna that is small and suitable as a vehicle-mounted antenna.

上記目的を達成するために、本発明に係る多周波共用モノポールアンテナは、１つの給電点を有し、共振周波数帯が所定の第１の周波数帯に設定された第１モノポールアンテナと、前記給電点と同じ給電点を有し、共振周波数帯が、前記第１の周波数帯より低い所定の第２の周波数帯に設定された２つの第２モノポールアンテナと、を備え、前記２つの第２モノポールアンテナは、前記第１モノポールアンテナを挟んで互いに平行に、該第１モノポールアンテナとの間隔が等間隔となるように配置されたことを特徴とする。この多周波共用モノポールアンテナでは、各第２モノポールアンテナと前記第１モノポールアンテナとの間隔を２ｍｍ以上１４ｍｍ以下に設定することが望ましい。   In order to achieve the above object, a multi-frequency monopole antenna according to the present invention includes a first monopole antenna having one feeding point and a resonance frequency band set to a predetermined first frequency band, Two second monopole antennas having the same feeding point as the feeding point and having a resonance frequency band set to a predetermined second frequency band lower than the first frequency band, The second monopole antenna is arranged in parallel with each other with the first monopole antenna interposed therebetween so that the distance from the first monopole antenna is equal. In this multi-frequency monopole antenna, it is desirable to set the distance between each second monopole antenna and the first monopole antenna to 2 mm or more and 14 mm or less.

また、本発明に係る多周波共用モノポールアンテナは、１つの給電点を有し、共振周波数帯が所定の第２の周波数帯に設定された第２モノポールアンテナと、前記給電点と同じ給電点を有し、共振周波数帯が、前記第２の周波数帯より高い所定の第１の周波数帯に設定された２つの第１モノポールアンテナと、を備え、前記２つの第１モノポールアンテナは、前記第２モノポールアンテナを挟んで互いに平行に、該第２モノポールアンテナとの間隔が等間隔となるように配置されたことを特徴とする。この多周波共用モノポールアンテナでは、各第１モノポールアンテナと前記第２モノポールアンテナとの間隔を２ｍｍ以上２５ｍｍ以下に設定することが望ましい。   In addition, the multi-frequency monopole antenna according to the present invention has a single feeding point, a second monopole antenna whose resonance frequency band is set to a predetermined second frequency band, and the same feeding as the feeding point. Two first monopole antennas having a point and having a resonance frequency band set to a predetermined first frequency band higher than the second frequency band, and the two first monopole antennas are The second monopole antenna is disposed in parallel with the second monopole antenna so that the intervals between the second monopole antenna and the second monopole antenna are equal. In this multi-frequency monopole antenna, it is desirable to set the distance between each first monopole antenna and the second monopole antenna to 2 mm or more and 25 mm or less.

以上のような本発明によれば、詳細なデータは後述するが、３つの周波数にて共振する、即ち、３共振することがわかる。このときの水平面内指向性は、オムニになる（すべての角度においてほぼ均一になり無指向性となる）ことから、移動通信の車載用アンテナとして小型で最適なアンテナを実現することができる。   According to the present invention as described above, although detailed data will be described later, it is understood that resonance occurs at three frequencies, that is, three resonances occur. The horizontal plane directivity at this time becomes omni (it is almost uniform at all angles and becomes omnidirectional). Therefore, a small and optimal antenna can be realized as a vehicle-mounted antenna for mobile communication.

［第１実施形態］
第１実施形態における多周波共用モノポールアンテナの構成を図１に示す。この図１に示すように、多周波共用モノポールアンテナ１０は、１つの給電点を有し共振周波数帯が所定の周波数帯fMに設定されたモノポールアンテナ１１と、上記給電点と同じ給電点を有し共振周波数帯が周波数帯fMより低い所定の周波数帯fLに設定された２つのモノポールアンテナ１２とを備え、２つのモノポールアンテナ１２は、モノポールアンテナ１１を挟んで互いに平行に、該モノポールアンテナ１１との間隔Ｌ１が等間隔となるように配置されている。このとき、間隔Ｌ１は、２ｍｍ以上１４ｍｍ以下に設定されている。 [First Embodiment]
FIG. 1 shows the configuration of a multi-frequency monopole antenna in the first embodiment. As shown in FIG. 1, multiband monopole antenna 10 includes a monopole antenna 11 in which the resonance frequency band is set to a predetermined frequency band f M has one feed point, the same power supply as the power supply point Two monopole antennas 12 each having a point and having a resonance frequency band set to a predetermined frequency band f L lower than the frequency band f M. The two monopole antennas 12 are sandwiched by the monopole antenna 11. In parallel, the L1 and the monopole antenna 11 are arranged at equal intervals L1. At this time, the interval L1 is set to 2 mm or more and 14 mm or less.

このように、多周波共用モノポールアンテナ１０は、小型アンテナを実現するためにモノポールアンテナ１１、１２を使用して構成され、具体的にはプリント基盤上で製作することを想定している。   As described above, the multi-frequency monopole antenna 10 is configured using the monopole antennas 11 and 12 in order to realize a small antenna, and specifically, is assumed to be manufactured on a printed board.

図２には、上記の構成の多周波共用モノポールアンテナ１０において、モノポールアンテナ１１、１２の間隔Ｌ１を変動させたときの電圧定在波比（ＶＳＷＲ：Voltage Standing Wave Ratio）の変化を示している。この図２より、間隔Ｌ１を２ｍｍ以上１４ｍｍ以下に設定することで３つの周波数にて共振する、即ち、３共振することがわかる。つまり、上記の周波数帯fL、fMのうち、低い方の周波数帯fLのおよそ２倍の高い周波数帯fHについては、給電素子や無給電素子を一切配置しないで共振させることができる。 FIG. 2 shows a change in voltage standing wave ratio (VSWR) when the interval L1 between the monopole antennas 11 and 12 is varied in the multi-frequency monopole antenna 10 having the above configuration. ing. From FIG. 2, it can be seen that by setting the interval L1 to 2 mm or more and 14 mm or less, resonance occurs at three frequencies, that is, three resonances occur. That is, among the above frequency bands f L and f M , the high frequency band f H that is approximately twice the lower frequency band f L can be resonated without any feeding element or parasitic element. .

図３には、上記の間隔Ｌ１を５ｍｍに設定したときの、多周波共用モノポールアンテナ１０の水平面内指向性を示す。この図３より、１本のアンテナにおいて移動通信サービス（例えばＩＭＴ−２０００のサービス）を行っている８００メガＨｚ帯、１．７ギガＨｚ帯、２ギガＨｚ帯では、ほぼオムニになる（すべての角度においてほぼ均一になり無指向性となる）ことから、移動通信の車載用アンテナとして小型で最適なアンテナを実現することができる。   FIG. 3 shows the directivity in the horizontal plane of the multi-frequency monopole antenna 10 when the distance L1 is set to 5 mm. From FIG. 3, the 800 MHz band, 1.7 GHz band, and 2 GHz band that provide mobile communication services (for example, IMT-2000 service) with one antenna are almost omni (all Therefore, it is possible to realize a small and optimal antenna as a vehicle-mounted antenna for mobile communication.

［第２実施形態］
第２実施形態における多周波共用モノポールアンテナの構成を図５に示す。この図５に示すように、多周波共用モノポールアンテナ２０は、１つの給電点を有し共振周波数帯が所定の周波数帯fLに設定されたモノポールアンテナ２１と、上記給電点と同じ給電点を有し共振周波数帯が周波数帯fLより高い所定の周波数帯fMに設定された２つのモノポールアンテナ２２とを備え、２つのモノポールアンテナ２２は、モノポールアンテナ２１を挟んで互いに平行に、該モノポールアンテナ２１との間隔Ｌ２が等間隔となるように配置されている。このとき、間隔Ｌ２は、２ｍｍ以上２５ｍｍ以下に設定されている。 [Second Embodiment]
FIG. 5 shows the configuration of a multi-frequency monopole antenna in the second embodiment. As shown in FIG. 5, the multi-frequency monopole antenna 20 includes a monopole antenna 21 having a single feeding point and a resonance frequency band set to a predetermined frequency band f L , and the same feeding as the feeding point. Two monopole antennas 22 each having a point and having a resonance frequency band set to a predetermined frequency band f M higher than the frequency band f L , and the two monopole antennas 22 sandwich each other with the monopole antenna 21 therebetween. In parallel, the monopole antennas 21 are arranged so that the intervals L2 are equal. At this time, the interval L2 is set to 2 mm or more and 25 mm or less.

このように、多周波共用モノポールアンテナ２０は、小型アンテナを実現するためにモノポールアンテナ２１、２２を使用して構成され、具体的にはプリント基盤上で製作することを想定している。   As described above, the multi-frequency monopole antenna 20 is configured using the monopole antennas 21 and 22 in order to realize a small antenna, and specifically, is assumed to be manufactured on a printed board.

図６には、上記の構成の多周波共用モノポールアンテナ２０において、モノポールアンテナ２１、２２の間隔Ｌ２を変動させたときの電圧定在波比（ＶＳＷＲ）の変化を示している。この図６より、間隔Ｌ２を２ｍｍ以上２５ｍｍ以下に設定することで３つの周波数にて共振する、即ち、３共振することがわかる。つまり、上記の周波数帯fL、fMのうち、低い方の周波数帯fLのおよそ２倍の高い周波数帯fHについては、給電素子や無給電素子を一切配置しないで共振させることができる。 FIG. 6 shows changes in the voltage standing wave ratio (VSWR) when the interval L2 between the monopole antennas 21 and 22 is varied in the multi-frequency shared monopole antenna 20 having the above-described configuration. From FIG. 6, it can be seen that by setting the distance L2 to 2 mm or more and 25 mm or less, resonance occurs at three frequencies, that is, three resonances occur. That is, among the above frequency bands f L and f M , the high frequency band f H that is approximately twice the lower frequency band f L can be resonated without any feeding element or parasitic element. .

図７には、上記の間隔Ｌ２を５ｍｍに設定したときの、多周波共用モノポールアンテナ２０の水平面内指向性を示す。この図７より、１本のアンテナにおいて移動通信サービス（例えばＩＭＴ−２０００のサービス）を行っている８００メガＨｚ帯、１．７ギガＨｚ帯、２ギガＨｚ帯では、ほぼオムニになる（すべての角度においてほぼ均一になり無指向性となる）ことから、移動通信の車載用アンテナとして小型で最適なアンテナを実現することができる。   FIG. 7 shows the directivity in the horizontal plane of the multi-frequency monopole antenna 20 when the distance L2 is set to 5 mm. From FIG. 7, it is almost omni in the 800 megahertz band, 1.7 gigahertz band, and 2 gigahertz band in which mobile communication service (for example, IMT-2000 service) is performed with one antenna (all Therefore, it is possible to realize a small and optimal antenna as a vehicle-mounted antenna for mobile communication.

［第１、第２実施形態の考察］
さて、図４には、第１実施形態の多周波共用モノポールアンテナ１０においてモノポールアンテナ間の間隔Ｌ１を５ｍｍに設定したときの電圧定在波比（ＶＳＷＲ）の変化と、第２実施形態の多周波共用モノポールアンテナ２０においてモノポールアンテナ間の間隔Ｌ２を５ｍｍに設定したときの電圧定在波比（ＶＳＷＲ）の変化の両方を示している。この図４より、多周波共用モノポールアンテナ１０、２０では、ほぼ同じ周波数帯で３共振することがわかる。 [Consideration of First and Second Embodiments]
FIG. 4 shows changes in the voltage standing wave ratio (VSWR) when the interval L1 between the monopole antennas is set to 5 mm in the multi-frequency monopole antenna 10 of the first embodiment, and the second embodiment. Both the changes of the voltage standing wave ratio (VSWR) when the space | interval L2 between monopole antennas is set to 5 mm in the multi-frequency common monopole antenna 20 are shown. From FIG. 4, it can be seen that the multi-frequency monopole antennas 10 and 3 resonate in substantially the same frequency band.

また、１本のアンテナにおいて移動通信サービス（例えばＩＭＴ−２０００のサービス）を行っている８００メガＨｚ帯、１．７ギガＨｚ帯、２ギガＨｚ帯では、電圧定在波比（ＶＳＷＲ）を２．０以下に収めることができる。   In addition, in the 800 megahertz band, 1.7 gigahertz band, and 2 gigahertz band in which mobile communication service (for example, IMT-2000 service) is performed with one antenna, the voltage standing wave ratio (VSWR) is 2 0.0 or less.

さらに、図３と図６を比較すれば明らかなように、８００メガＨｚ帯、１．７ギガＨｚ帯、２ギガＨｚ帯では、ほぼオムニになる（すべての角度においてほぼ均一になり無指向性となる）ことがわかる。   Further, as apparent from comparison between FIG. 3 and FIG. 6, the 800 MHz band, the 1.7 gigahertz band, and the 2 gigahertz band are almost omnidirectional (almost uniform and omnidirectional at all angles). It becomes clear.

以上のことから、第１、第２実施形態とも、移動通信の車載用アンテナとして小型で最適なアンテナを実現することができる。   From the above, in both the first and second embodiments, it is possible to realize a small and optimal antenna as an in-vehicle antenna for mobile communication.

第１実施形態における多周波共用モノポールアンテナの構成図である。It is a block diagram of the multifrequency monopole antenna in 1st Embodiment. 図１のモノポールアンテナの間隔を変えたときの電圧定在波比（ＶＳＷＲ）の変化を示すグラフである。It is a graph which shows the change of voltage standing wave ratio (VSWR) when the space | interval of the monopole antenna of FIG. 1 is changed. 図１のモノポールアンテナの間隔を５ｍｍに設定したときの多周波共用モノポールアンテナの水平面内指向性を示すグラフである。It is a graph which shows the directivity in the horizontal surface of a multi-frequency common monopole antenna when the space | interval of the monopole antenna of FIG. 1 is set to 5 mm. 図１の間隔Ｌ１を５ｍｍに設定したときの電圧定在波比（ＶＳＷＲ）の変化と、図５の間隔Ｌ２を５ｍｍに設定したときの電圧定在波比（ＶＳＷＲ）の変化を示すグラフである。FIG. 3 is a graph showing a change in voltage standing wave ratio (VSWR) when the interval L1 in FIG. 1 is set to 5 mm and a change in voltage standing wave ratio (VSWR) when the interval L2 in FIG. 5 is set to 5 mm. is there. 第２実施形態における多周波共用モノポールアンテナの構成図である。It is a block diagram of the multifrequency monopole antenna in 2nd Embodiment. 図５のモノポールアンテナの間隔を変えたときの電圧定在波比（ＶＳＷＲ）の変化を示すグラフである。It is a graph which shows the change of voltage standing wave ratio (VSWR) when the space | interval of the monopole antenna of FIG. 5 is changed. 図５のモノポールアンテナの間隔を５ｍｍに設定したときの多周波共用モノポールアンテナの水平面内指向性を示すグラフである。6 is a graph showing the directivity in a horizontal plane of a multi-frequency monopole antenna when the interval between the monopole antennas of FIG. 5 is set to 5 mm.

符号の説明Explanation of symbols

１０…多周波共用モノポールアンテナ、１１…モノポールアンテナ、１２…モノポールアンテナ、２０…多周波共用モノポールアンテナ、２１…モノポールアンテナ、２２…モノポールアンテナ。   DESCRIPTION OF SYMBOLS 10 ... Multi-frequency monopole antenna, 11 ... Monopole antenna, 12 ... Monopole antenna, 20 ... Multi-frequency monopole antenna, 21 ... Monopole antenna, 22 ... Monopole antenna

Claims (4)

１つの給電点を有し、共振周波数帯が所定の第１の周波数帯に設定された第１モノポールアンテナと、
前記給電点と同じ給電点を有し、共振周波数帯が、前記第１の周波数帯より低い所定の第２の周波数帯に設定された２つの第２モノポールアンテナと、
を備え、
前記２つの第２モノポールアンテナは、前記第１モノポールアンテナを挟んで互いに平行に、該第１モノポールアンテナとの間隔が等間隔となるように配置された、
ことを特徴とする多周波共用モノポールアンテナ。 A first monopole antenna having one feeding point and having a resonance frequency band set to a predetermined first frequency band;
Two second monopole antennas having the same feeding point as the feeding point and having a resonance frequency band set to a predetermined second frequency band lower than the first frequency band;
With
The two second monopole antennas are arranged in parallel with each other with the first monopole antenna in between so that the intervals between the two monopole antennas are equal.
Multi-frequency monopole antenna characterized by that. 各第２モノポールアンテナと前記第１モノポールアンテナとの間隔が、２ｍｍ以上１４ｍｍ以下に設定されたことを特徴とする請求項１記載の多周波共用モノポールアンテナ。   2. The multi-frequency monopole antenna according to claim 1, wherein an interval between each second monopole antenna and the first monopole antenna is set to 2 mm or more and 14 mm or less. １つの給電点を有し、共振周波数帯が所定の第２の周波数帯に設定された第２モノポールアンテナと、
前記給電点と同じ給電点を有し、共振周波数帯が、前記第２の周波数帯より高い所定の第１の周波数帯に設定された２つの第１モノポールアンテナと、
を備え、
前記２つの第１モノポールアンテナは、前記第２モノポールアンテナを挟んで互いに平行に、該第２モノポールアンテナとの間隔が等間隔となるように配置された、
ことを特徴とする多周波共用モノポールアンテナ。 A second monopole antenna having one feeding point and having a resonance frequency band set to a predetermined second frequency band;
Two first monopole antennas having the same feeding point as the feeding point and having a resonance frequency band set to a predetermined first frequency band higher than the second frequency band;
With
The two first monopole antennas are arranged in parallel with each other with the second monopole antenna in between so that the intervals between the two monopole antennas are equal.
Multi-frequency monopole antenna characterized by that. 各第１モノポールアンテナと前記第２モノポールアンテナとの間隔が、２ｍｍ以上２５ｍｍ以下に設定されたことを特徴とする請求項３記載の多周波共用モノポールアンテナ。   4. The multi-frequency monopole antenna according to claim 3, wherein an interval between each first monopole antenna and the second monopole antenna is set to 2 mm or more and 25 mm or less.
JP2006259218A 2006-09-25 2006-09-25 Multiple-frequency common monopole antenna Pending JP2008079246A (en)

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CN102598410A (en) * 2009-10-30 2012-07-18 莱尔德技术股份有限公司 Omnidirectional multi-band antennas
JP2014110561A (en) * 2012-12-03 2014-06-12 Hitachi Industrial Equipment Systems Co Ltd Planar antenna
JP2015185853A (en) * 2014-03-20 2015-10-22 株式会社日立国際八木ソリューションズ Multifrequency monopole antenna

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CN102598410A (en) * 2009-10-30 2012-07-18 莱尔德技术股份有限公司 Omnidirectional multi-band antennas
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