JPH09153727A - Broad band antenna - Google Patents
Broad band antennaInfo
- Publication number
- JPH09153727A JPH09153727A JP31128895A JP31128895A JPH09153727A JP H09153727 A JPH09153727 A JP H09153727A JP 31128895 A JP31128895 A JP 31128895A JP 31128895 A JP31128895 A JP 31128895A JP H09153727 A JPH09153727 A JP H09153727A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- semi
- broad band
- conductor
- ceiling
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Support Of Aerials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、移動体通信の基地
局などに用いられる広帯域アンテナに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wideband antenna used for a mobile communication base station or the like.
【０００２】[0002]
【従来の技術】現在実用化されている移動体通信として
は、ポケベル、携帯電話、ＰＨＳなどがある。これらの
移動体通信の使用周波数帯は、ポケベルが２８０ＭＨｚ
帯、携帯電話が８００ＭＨｚ帯と１５００ＭＨｚ帯、Ｐ
ＨＳが１９００ＭＨｚ帯である。従来、これらの移動体
通信の基地局には、それぞれの周波数帯に適したアンテ
ナが個別に設置されている。2. Description of the Related Art Mobile communications currently in practical use include pagers, mobile phones, and PHS. The frequency band used for these mobile communications is 280 MHz for pagers.
Band, mobile phone 800MHz band and 1500MHz band, P
HS is in the 1900 MHz band. Conventionally, antennas suitable for respective frequency bands are individually installed in these mobile communication base stations.
【０００３】移動体通信の基地局アンテナの設置箇所は
通常の場合屋外であるが、最近では電波の届きにくい地
下街や地下駐車場などでも移動体通信を利用できるよう
にしたいという要求があり、地下街や地下駐車場などに
基地局アンテナを設置することが検討されている。しか
し地下街や地下駐車場などで全ての移動体通信に対応し
ようとすると、移動体通信の種類毎にアンテナを設置す
る必要があり、非常にコスト高になるという問題があ
る。また地下街や地下駐車場などでのアンテナの設置箇
所は多くの場合、天井であるので、天井に幾種類ものア
ンテナを取り付けることは美観上も好ましくない。The location of the base station antenna for mobile communication is usually outdoors, but recently there is a demand for mobile communication to be available even in underground malls and underground parking lots where radio waves are hard to reach. It is being considered to install a base station antenna in a parking lot or underground parking lot. However, in order to support all mobile communication in underground malls and underground parking lots, it is necessary to install an antenna for each type of mobile communication, which causes a problem of extremely high cost. In many cases, the antenna is installed on the ceiling in an underground shopping area or an underground parking lot. Therefore, it is aesthetically unpleasant to attach several kinds of antennas to the ceiling.
【０００４】[0004]
【発明が解決しようとする課題】上記のような問題を解
消するためには、１つのアンテナで複数種類の移動体通
信に対応できるような広帯域のアンテナを使用すればよ
い。この要求に合う公知のアンテナとしては図５に示す
コニカルアンテナが考えられる。図５において符号１は
コニカルアンテナを示す。コニカルアンテナ１は外周面
が円錐形の導体からなるものである。このコニカルアン
テナ１を例えば地下街の天井などに設置する場合には、
コニカルアンテナアンテナ１を同軸接栓２により金属製
の反射板３の下面側に垂直に取り付け、この反射板２を
天井に取り付ければよい。In order to solve the above problems, a wide band antenna which can handle a plurality of types of mobile communication with one antenna may be used. A conical antenna shown in FIG. 5 can be considered as a known antenna that meets this requirement. In FIG. 5, reference numeral 1 indicates a conical antenna. The conical antenna 1 is made of a conductor whose outer peripheral surface is conical. When installing this conical antenna 1 on the ceiling of an underground mall, for example,
The conical antenna 1 may be attached vertically to the lower surface side of the metallic reflector 3 by the coaxial connector 2, and the reflector 2 may be attached to the ceiling.
【０００５】しかしながらコニカルアンテナは、アンテ
ナとして使用可能なＶＳＷＲ（電圧定在波比）をほぼ２
以下とすると、電気長で９０°（１／４波長）以上の高
さが必要であり、天井などへ設置するアンテナとしては
大きすぎるという問題がある。例えば使用周波数が２８
０ＭＨｚ以上の広帯域アンテナを考えた場合、アンテナ
の高さは２６７ｍｍ以上必要である。円錐形の頂角を９
０°とすると、下縁の直径は５３４ｍｍ以上になる。こ
の大きさのアンテナを天井に取り付けるとなると、かな
り目立つ存在となり、違和感を与えるおそれがある。ま
た重量を考えると支持構造も問題である。However, a conical antenna has a VSWR (voltage standing wave ratio) of approximately 2 which can be used as an antenna.
In the case of the following, a height of 90 ° (1/4 wavelength) or more in electrical length is required, and there is a problem that it is too large as an antenna to be installed on a ceiling or the like. For example, the used frequency is 28
Considering a broadband antenna of 0 MHz or more, the height of the antenna needs to be 267 mm or more. The apex angle of the cone is 9
When the angle is 0 °, the diameter of the lower edge is 534 mm or more. If an antenna of this size is attached to the ceiling, it will be quite conspicuous and may give a feeling of strangeness. Also, considering the weight, the support structure is also a problem.
【０００６】図６は、高さ９０ｍｍ、直径１８０ｍｍ、
頂角９０°のコニカルアンテナを試作し、ＶＳＷＲ特性
を測定した結果を示す。ＶＳＷＲを約２以下とすると、
この大きさで、使用周波数帯が８００ＭＨｚと１５００
ＭＨｚの携帯電話および１９００ＭＨｚのＰＨＳに対応
できることが分かる。FIG. 6 shows a height of 90 mm, a diameter of 180 mm,
The results of measuring the VSWR characteristics of a prototype conical antenna with an apex angle of 90 ° are shown. If VSWR is about 2 or less,
With this size, the frequency band used is 800MHz and 1500
It can be seen that the mobile phone of MHz and the PHS of 1900 MHz can be supported.
【０００７】しかしながら従来のコニカルアンテナでは
これ以上小型化することはできない。地下街などに設置
されるアンテナは出来るだけ目立たないこと、設置スペ
ースが小さいことが要求されるので、さらに小型化する
ことが望まれる。However, the conventional conical antenna cannot be further downsized. Since the antenna installed in an underground mall or the like needs to be as inconspicuous as possible and requires a small installation space, further miniaturization is desired.
【０００８】本発明の目的は、コニカルアンテナよりさ
らに小型化、軽量化が可能な広帯域アンテナを提供する
ことにある。An object of the present invention is to provide a wideband antenna which can be made smaller and lighter than a conical antenna.
【０００９】[0009]
【課題を解決するための手段】この目的を達成するため
本発明者等は、種々の形状のアンテナを試作、検討した
結果、外周面を半楕円回転体形または半球形にしたアン
テナが小型で広帯域に対応できることを確認した。すな
わち本発明の広帯域アンテナは、外周面が半楕円回転体
形または半球形の導体からなることを特徴とするもので
ある。In order to achieve this object, the inventors of the present invention have experimentally produced antennas of various shapes, and as a result, have found that an antenna having an outer peripheral surface of a semi-elliptical shape or a hemispherical shape has a small size and a wide band. It was confirmed that it can correspond to. That is, the broadband antenna of the present invention is characterized in that the outer peripheral surface is formed of a semi-elliptical rotator or hemispherical conductor.
【００１０】[0010]
【発明の実施の形態】図１は本発明の一実施形態を示
す。このアンテナ４は外周面が半楕円回転体形（楕円回
転体の長軸の中央部を垂直に切断した形）の導体からな
るものである。材質は全体をアルミまたは銅などの導電
性金属で構成してもよいし、プラスチック製半楕円回転
体の外周面に導電性金属の皮膜を形成したものでもよ
い。内部は中空でも中実でもよいが、軽量化、コスト低
減の観点からは中空が望ましい。このアンテナ４を地下
街の天井などに設置する場合は、頂部を同軸接栓２（Ｎ
型接栓等）を介して金属製の反射板３に取り付け、その
反射板３を天井に取り付けるようにすればよい。FIG. 1 shows an embodiment of the present invention. The antenna 4 has a semi-elliptical rotator-shaped outer peripheral surface (a shape in which the central portion of the long axis of the elliptical rotator is cut vertically). The material may be entirely made of a conductive metal such as aluminum or copper, or may be a plastic semi-elliptical rotary member having a conductive metal film formed on the outer peripheral surface thereof. The inside may be hollow or solid, but hollow is preferable from the viewpoint of weight reduction and cost reduction. When this antenna 4 is installed on the ceiling of an underground mall, etc., the top of the antenna is a coaxial plug 2 (N
It may be attached to the metallic reflection plate 3 via a mold plug or the like), and the reflection plate 3 may be attached to the ceiling.
【００１１】図２は図１の形態のアンテナ４を試作し
て、ＶＳＷＲ特性を測定した結果を示す。アンテナ４の
寸法は図１に示すように高さ６０ｍｍ、下縁直径６０ｍ
ｍ、材質はアルミである。このアンテナ４を１辺３００
ｍｍの正方形の反射板３に取り付けて測定を行った。そ
の結果、図２に示すように８００ＭＨｚ以上でＶＳＷＲ
が２以下になることが確認された。したがってこのアン
テナは８００ＭＨｚと１５００ＭＨｚの携帯電話および
１９００ＭＨｚのＰＨＳに共用することが可能であり、
しかも従来のコニカルアンテナより外形寸法を大幅に小
さくできるという利点がある。FIG. 2 shows the result of measuring the VSWR characteristics of the prototype antenna 4 of the embodiment shown in FIG. As shown in FIG. 1, the antenna 4 has a height of 60 mm and a lower edge diameter of 60 m.
The material is aluminum. This antenna 4 has 300 sides
The measurement was carried out by attaching to a square reflector 3 mm. As a result, as shown in FIG.
Was confirmed to be 2 or less. Therefore, this antenna can be used for both 800MHz and 1500MHz mobile phones and 1900MHz PHS,
Moreover, there is an advantage that the external dimensions can be made significantly smaller than that of the conventional conical antenna.
【００１２】図３は本発明の他の実施形態を示す。この
アンテナ５は外周面が半球形の導体からなるものであ
る。材質や取り付け方などは図１のアンテナと同じであ
る。FIG. 3 shows another embodiment of the present invention. The antenna 5 has a conductor whose outer peripheral surface is hemispherical. The material and mounting method are the same as those of the antenna of FIG.
【００１３】図４は図３の形態のアンテナを試作して、
ＶＳＷＲ特性を測定した結果を示す。アンテナ５の寸法
は図３に示すように高さ７５ｍｍ、下縁直径１５０ｍ
ｍ、材質はアルミである。このアンテナ５を１辺３００
ｍｍの正方形の反射板３に取り付けて測定を行った。そ
の結果、８００ＭＨｚ以上でＶＳＷＲがほぼ２以下にな
ることが確認された。したがってこのアンテナは携帯電
話とＰＨＳに共用することが可能であり、しかも従来の
コニカルアンテナより外形寸法を小さくできるという利
点がある。FIG. 4 shows a prototype of the antenna shown in FIG.
The result of having measured the VSWR characteristic is shown. As shown in FIG. 3, the antenna 5 has a height of 75 mm and a lower edge diameter of 150 m.
The material is aluminum. This antenna 5 has one side 300
The measurement was carried out by attaching to a square reflector 3 mm. As a result, it was confirmed that VSWR was approximately 2 or less at 800 MHz or higher. Therefore, there is an advantage that this antenna can be shared by a mobile phone and a PHS, and the external dimensions can be made smaller than the conventional conical antenna.
【００１４】[0014]
【発明の効果】以上説明したように本発明によれば、複
数種類の移動体通信に共用でき、しかも十分小型な広帯
域アンテナを得ることができる。As described above, according to the present invention, it is possible to obtain a wideband antenna which can be commonly used for a plurality of types of mobile communication and which is sufficiently small.
【図１】 本発明に係る広帯域アンテナの一実施形態を
示す（ａ）は正面図、（ｂ）は底面図。FIG. 1A is a front view and FIG. 1B is a bottom view showing an embodiment of a broadband antenna according to the present invention.
【図２】 図１のアンテナのＶＳＷＲ特性を示すグラ
フ。FIG. 2 is a graph showing VSWR characteristics of the antenna of FIG.
【図３】 本発明に係る広帯域アンテナの他の実施形態
を示す（ａ）は正面図、（ｂ）は底面図。3A is a front view and FIG. 3B is a bottom view showing another embodiment of the broadband antenna according to the present invention.
【図４】 図３のアンテナのＶＳＷＲ特性を示すグラ
フ。4 is a graph showing VSWR characteristics of the antenna of FIG.
【図５】 従来のコニカルアンテナを示す（ａ）は正面
図、（ｂ）は底面図。5A is a front view and FIG. 5B is a bottom view showing a conventional conical antenna.
【図６】 図５のアンテナのＶＳＷＲ特性を示すグラ
フ。6 is a graph showing VSWR characteristics of the antenna of FIG.
２：同軸接栓 ３：反射板 ４：本発明の半楕円回転体形アンテナ ５：本発明の半球形アンテナ 2: Coaxial plug 3: Reflector 4: Semi-elliptical rotor antenna of the present invention 5: Hemispherical antenna of the present invention
Claims (1)
体からなる広帯域アンテナ。1. A broadband antenna having an outer peripheral surface made of a semi-elliptical rotator or hemispherical conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31128895A JPH09153727A (en) | 1995-11-29 | 1995-11-29 | Broad band antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31128895A JPH09153727A (en) | 1995-11-29 | 1995-11-29 | Broad band antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09153727A true JPH09153727A (en) | 1997-06-10 |
Family
ID=18015335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31128895A Pending JPH09153727A (en) | 1995-11-29 | 1995-11-29 | Broad band antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09153727A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010026655A (en) * | 1999-09-08 | 2001-04-06 | 김상기 | Small omni antenna for sticking the ceiling in wireless communication system |
| JP2006186945A (en) * | 2004-12-28 | 2006-07-13 | Toyota Motor Corp | Antenna device and communication method using same |
| US7180458B2 (en) | 2004-07-13 | 2007-02-20 | Ricoh Company, Ltd. | Antenna and information communication apparatus using the antenna |
| US7245263B2 (en) | 2005-02-18 | 2007-07-17 | Ricoh Company, Ltd. | Antenna |
| US7626558B2 (en) | 2002-10-23 | 2009-12-01 | Sony Corporation | Wideband antenna |
| JP2010529795A (en) * | 2007-06-12 | 2010-08-26 | トムソン ライセンシング | Omnidirectional volume antenna |
-
1995
- 1995-11-29 JP JP31128895A patent/JPH09153727A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010026655A (en) * | 1999-09-08 | 2001-04-06 | 김상기 | Small omni antenna for sticking the ceiling in wireless communication system |
| US7626558B2 (en) | 2002-10-23 | 2009-12-01 | Sony Corporation | Wideband antenna |
| US7180458B2 (en) | 2004-07-13 | 2007-02-20 | Ricoh Company, Ltd. | Antenna and information communication apparatus using the antenna |
| JP2006186945A (en) * | 2004-12-28 | 2006-07-13 | Toyota Motor Corp | Antenna device and communication method using same |
| US7245263B2 (en) | 2005-02-18 | 2007-07-17 | Ricoh Company, Ltd. | Antenna |
| JP2010529795A (en) * | 2007-06-12 | 2010-08-26 | トムソン ライセンシング | Omnidirectional volume antenna |
| US11271316B2 (en) | 2007-06-12 | 2022-03-08 | Thomson Licensing | Omnidirectional volumetric antenna |
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