JP2000223943A - Dual beam antenna and its mounting structure - Google Patents
Dual beam antenna and its mounting structureInfo
- Publication number
- JP2000223943A JP2000223943A JP11026366A JP2636699A JP2000223943A JP 2000223943 A JP2000223943 A JP 2000223943A JP 11026366 A JP11026366 A JP 11026366A JP 2636699 A JP2636699 A JP 2636699A JP 2000223943 A JP2000223943 A JP 2000223943A
- Authority
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- Japan
- Prior art keywords
- antenna
- dual beam
- dual
- beam antenna
- mounting
- 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.)
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- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばトンネル内
などの壁面や天井に取り付けられてトンネルの長手方向
などに電波を放射するために用いられ、特に、トンネル
内などの携帯電話不感地帯用の基地局アンテナとして用
いられるデュアルビームアンテナ装置およびその取り付
け構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for radiating radio waves in the longitudinal direction of a tunnel by being attached to a wall surface or a ceiling, for example, in a tunnel. The present invention relates to a dual beam antenna device used as a base station antenna and a mounting structure thereof.
【０００２】[0002]
【従来の技術】プリント基板の面に平行な方向に指向性
を持つアンテナとして、例えば図１２に示すような八木
アンテナ（プリント八木アンテナ）が知られている。こ
の種の八木アンテナは、同図の（ａ）に示すように、誘
電体基板１などのプリント基板の裏面側にアース面（反
射素子）２を形成し、プリント基板の表面側と裏面側に
それぞれ、間隔を介して放射素子３と導波素子４とを形
成したものからなり（同図において、実線は、誘電体基
板１の表面側に形成された素子パターン等を示し、破線
は、誘電体基板１の裏面側に形成された素子パターン等
を示している）、八木アンテナは、反射素子２と放射素
子３と導波素子４の３種の素子を有して形成されてい
る。2. Description of the Related Art As an antenna having directivity in a direction parallel to a surface of a printed circuit board, for example, a Yagi antenna (printed Yagi antenna) as shown in FIG. 12 is known. In this type of Yagi antenna, as shown in FIG. 1A, a ground plane (reflection element) 2 is formed on the back side of a printed board such as a dielectric board 1, and the front side and the back side of the printed board are formed. Each of them consists of a radiation element 3 and a waveguide element 4 formed at intervals (in the same figure, solid lines indicate element patterns formed on the surface side of the dielectric substrate 1, and broken lines indicate dielectric patterns). An element pattern and the like formed on the back surface of the body substrate 1 are shown), and the Yagi antenna is formed to include three types of elements: a reflecting element 2, a radiating element 3, and a waveguide element 4.
【０００３】なお、図中、５は、ストリップライン、３
０は、平衡二線を示しており、ストリップライン５およ
び平衡二線３０を介して放射素子３に給電する。この八
木アンテナにおいては、メインビームがアース面２側か
ら導波素子４側に向かって放射され、したがって、アン
テナビームは、単一指向性である。In the drawings, reference numeral 5 denotes a strip line, 3
0 indicates a balanced two-wire, and feeds the radiating element 3 through the strip line 5 and the balanced two-wire 30. In this Yagi antenna, the main beam is radiated from the ground plane 2 side to the waveguide element 4 side, and therefore, the antenna beam is unidirectional.
【０００４】ところで、トンネル内等に設けられるアン
テナ装置には、トンネル長手方向に電波を放射させるこ
とが求められており、そのためには、アンテナビームを
双方向に放射させる、いわゆる双方向指向性を有するア
ンテナを備えたアンテナ装置であることが求められてい
るが、前記八木アンテナにおいては、アンテナビーム
は、単一指向性であるため、このアンテナを用いて双方
向指向性とするためには、２つのアンテナをそれぞれ指
向方向に向けて配設する必要が生じ、構造が複雑にな
り、小型のアンテナ装置を実現することが困難である。[0004] An antenna device provided in a tunnel or the like is required to radiate radio waves in the longitudinal direction of the tunnel. For this purpose, a so-called bidirectional directivity for radiating an antenna beam in both directions is required. Although it is required to be an antenna device having an antenna having, in the Yagi antenna, since the antenna beam is unidirectional, in order to use this antenna to make bidirectional directivity, It is necessary to dispose the two antennas in the directional directions, respectively, which complicates the structure and makes it difficult to realize a small antenna device.
【０００５】そこで、例えば図３に示すように、誘電体
基板１に形成したアース面２を挟んだ両側に間隔を介し
て放射素子３と導波素子４とを設けることにより、誘電
体基板１の左右に２基の八木アンテナを設けた双方向指
向性のアンテナとし、この誘電体基板１を、図１４の
（ａ）に示すように、箱状のパッケージであるレドーム
８内に収容したデュアルビームアンテナ９が提案されて
いる。なお、図３において、破線は反対側の面に形成さ
れたパターン（アース面２、放射素子３、ストリップラ
イン５、平衡二線３０の各パターン）を示している。Therefore, as shown in FIG. 3, for example, a radiating element 3 and a waveguide element 4 are provided on both sides of a ground plane 2 formed on a dielectric substrate 1 with an interval therebetween, whereby the dielectric substrate 1 is formed. A dual-directional antenna having two Yagi antennas provided on the left and right sides of the same, and this dielectric substrate 1 is housed in a radome 8 which is a box-shaped package as shown in FIG. A beam antenna 9 has been proposed. In FIG. 3, broken lines indicate patterns (each of the ground plane 2, the radiating element 3, the strip line 5, and the balanced two-wires 30) formed on the opposite surface.
【０００６】図１３には、この種のデュアルビームアン
テナ９から放射されるデュアルビーム１１の双方向指向
性のうち、八の字型指向性と呼ばれている指向性の理想
的な指向性が示されている。なお、同図においては、デ
ュアルビーム１１を平面的に示してあるが、実際には、
デュアルビーム１１は、そのビーム出射部（図の中央
部）から、誘電体基板１の面に平行な双方向に、それぞ
れ球面状に放射される。FIG. 13 shows an ideal directivity called a figure-eight directivity among the bidirectional directivities of the dual beam 11 radiated from the dual beam antenna 9 of this type. It is shown. Although the dual beam 11 is shown in a plan view in FIG.
The dual beam 11 is emitted from its beam emitting portion (the center in the figure) in a spherical shape in both directions parallel to the surface of the dielectric substrate 1.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、図１３
および図１４の（ａ）に示すような八の字型指向性を有
するデュアルビームアンテナ９を、図１４の（ｂ）に示
すように、壁面１９などに近づけると、デュアルビーム
１１が誘電体基板１の面に平行な方向に放射されなくな
り、デュアルビーム１１の八の字型指向性の開き角４０
が、同図に示すように１８０度よりも小さくなる。この
開き角４０の変化の大きさは、デュアルビームアンテナ
９の設置部としての壁面１９等の材質および状態（壁面
が乾いているか、水が流れているか等）等によっても異
なるものであるため、デュアルビームアンテナ装置のア
ンテナ設置部により前記開き角４０にばらつきが生じ、
デュアルビームアンテナ装置を例えば携帯電話不感地帯
用の基地局アンテナとして用いる場合に支障が生じてし
まうといった問題があった。However, FIG.
When the dual beam antenna 9 having an eight-shaped directivity as shown in FIG. 14A is brought close to a wall 19 or the like as shown in FIG. The beam is no longer radiated in the direction parallel to the plane of FIG.
However, as shown in FIG. The magnitude of the change in the opening angle 40 differs depending on the material and the state (whether the wall surface is dry, the water is flowing, etc.) of the wall surface 19 and the like as the installation portion of the dual beam antenna 9, and the like. Due to the antenna installation part of the dual beam antenna device, the opening angle 40 varies,
For example, there is a problem that a problem occurs when the dual beam antenna device is used as a base station antenna for a mobile phone blind zone.
【０００８】また、デュアルビームアンテナ９等のアン
テナをトンネル内の壁面１９や天井などに設ける場合に
は、アンテナを壁面１９や天井などのアンテナ設置部に
取り付けるための取り付け具が必要となるが、例えば鉄
道トンネルなどのトンネル内では車体が通過するときに
生じる風圧が高いため、アンテナをトンネル内に取り付
ける取り付け具にも強度が必要となる。そこで、前記取
り付け具として、強度が高い金属が用いられるが、この
金属製の取り付け具、すなわち、取り付け金具がデュア
ルビーム１１の利得などに与える影響も大きく、この影
響の低減も必要であった。When an antenna such as the dual beam antenna 9 is provided on a wall 19 or a ceiling in a tunnel, a mounting tool for mounting the antenna on an antenna installation portion such as the wall 19 or a ceiling is required. For example, in a tunnel such as a railway tunnel, the wind pressure generated when the vehicle body passes through is high, so that a fixture for mounting the antenna in the tunnel also needs strength. Therefore, a metal having high strength is used as the mounting tool. However, the metal mounting tool, that is, the mounting metal has a large effect on the gain of the dual beam 11, and the influence has to be reduced.
【０００９】なお、デュアルビームアンテナ装置を例え
ば鉄道トンネルなどのトンネル内に設置する目的は、ト
ンネル内などの携帯電話不感地帯用の基地局アンテナと
して用いるためであることが多いため、当然のことなが
ら、この基地局アンテナとして十分な利得を有すること
が要求されている。The purpose of installing the dual beam antenna device in a tunnel such as a railway tunnel is often to use it as a base station antenna for a mobile phone blind zone in a tunnel or the like. It is required that this base station antenna has a sufficient gain.
【００１０】本発明は、上記従来の課題を解決するため
になされたものであり、その目的は、デュアルビームア
ンテナをアンテナ設置部に取り付ける際に、デュアルビ
ームの指向性のアンテナ設置部による変化を低減し、安
定した指向性のデュアルビームを放射でき、かつ、例え
ばトンネル内などの携帯電話不感地帯用の基地局アンテ
ナとして十分な利得を得ることができ、さらに、例えば
取り付け場所の風圧などに耐えることができる強度的に
強いデュアルビームアンテナ装置およびデュアルビーム
アンテナ装置の取り付け構造を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. An object of the present invention is to provide a dual-beam antenna which is mounted on an antenna installation section, and which has a dual beam directivity that is changed by the antenna installation section. It can reduce and emit a dual beam of stable directivity, and can obtain a sufficient gain as a base station antenna for a mobile phone blind zone such as in a tunnel, and can withstand, for example, wind pressure at a mounting location It is an object of the present invention to provide a dual beam antenna device which can be strong in strength and a mounting structure of the dual beam antenna device.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明は次のような構成をもって課題を解決するた
めの手段としている。すなわち、本発明のデュアルビー
ムアンテナ装置は、基板に２基の八木アンテナが設けら
れてアンテナビームが双方向指向性を有するデュアルビ
ームアンテナを有し、該デュアルビームアンテナの背面
側には該デュアルビームアンテナをアンテナ設置部に取
り付けるための取り付け金具が設けられており、該取り
付け金具の前記デュアルビームアンテナ取り付け面は該
デュアルビームアンテナの導波素子の長手方向に沿う方
向の幅がアンテナ波長の約０．２５倍以下と成している
構成をもって課題を解決する手段としている。ここで、
アンテナ波長とは、アンテナが共振する電波の波長のこ
とをいう。In order to achieve the above-mentioned object, the present invention has the following structure to solve the problem. That is, the dual beam antenna device of the present invention has a dual beam antenna in which two Yagi antennas are provided on a substrate and the antenna beam has bidirectional directivity, and the dual beam antenna is provided on the back side of the dual beam antenna. A mounting bracket for mounting the antenna to the antenna mounting portion is provided, and the dual-beam antenna mounting surface of the mounting bracket has a width in the direction along the longitudinal direction of the waveguide element of the dual-beam antenna of about 0 of the antenna wavelength. With a configuration of .25 times or less, this is a means for solving the problem. here,
The antenna wavelength refers to a wavelength of a radio wave at which the antenna resonates.
【００１２】また、前記デュアルビームアンテナとアン
テナ設置部との距離を可変調節するアンテナ取り付け距
離可変手段が設けられていることも本発明のデュアルビ
ームアンテナ装置の特徴的な構成とされている。Further, a characteristic feature of the dual beam antenna device of the present invention is that an antenna mounting distance varying means for variably adjusting the distance between the dual beam antenna and the antenna installation portion is provided.
【００１３】さらに、本発明のデュアルビームアンテナ
装置の取り付け構造は、上記構成のデュアルビームアン
テナ装置の取り付け構造であって、アンテナビームの双
方向指向性の開き角４０を予め定められた設定角度にす
る反射板をアンテナ設置部に設けた構成をもって課題を
解決する手段としている。Further, the mounting structure of the dual beam antenna device according to the present invention is the mounting structure of the dual beam antenna device having the above-described configuration, wherein the opening angle 40 of the bidirectional directivity of the antenna beam is set to a predetermined setting angle. This is a means for solving the problem with a configuration in which a reflecting plate is provided in the antenna installation section.
【００１４】上記構成のデュアルビームアンテナ装置に
おいて、デュアルビームアンテナの背面側にはデュアル
ビームアンテナをアンテナ設置部に取り付けるための取
り付け金具が設けられているため、例えば鉄道トンネル
内等の車体が通過するときに生じる風圧が高い場所にデ
ュアルビームアンテナ装置を取り付けても、その風圧な
どに耐えることができる。In the dual beam antenna device having the above-described structure, a mounting bracket for mounting the dual beam antenna to the antenna installation portion is provided on the back side of the dual beam antenna, so that a vehicle body in a railway tunnel, for example, passes therethrough. Even if the dual beam antenna device is mounted in a place where the wind pressure generated sometimes is high, it can withstand the wind pressure and the like.
【００１５】また、デュアルビームアンテナ装置におい
て、デュアルビームアンテナのデュアルビーム指向性は
取り付け金具により影響を受けることになるが、本発明
者が、取り付け金具のデュアルビームアンテナ取り付け
面におけるデュアルビームアンテナの導波素子の長手方
向に沿う方向（偏波方向）の幅とデュアルビームアンテ
ナの利得との関係を調べたところ、前記幅をアンテナ波
長の約０．２５倍以下とすると、前記利得を例えば携帯
電話不感地帯用の基地局アンテナとして用いる場合に十
分な値となることが分かった。In the dual beam antenna device, the dual beam directivity of the dual beam antenna is affected by the mounting bracket, but the present inventor has proposed that the dual beam antenna be installed on the dual beam antenna mounting surface of the mounting bracket. When the relationship between the width of the wave element in the direction along the longitudinal direction (polarization direction) and the gain of the dual beam antenna was examined, when the width was set to about 0.25 times or less of the antenna wavelength, the gain was set to, for example, a cellular phone. It was found that the value was sufficient when used as a base station antenna for a blind zone.
【００１６】本発明のデュアルビームアンテナ装置は、
取り付け金具のデュアルビームアンテナ取り付け面にお
けるデュアルビームアンテナの導波素子の長手方向に沿
う方向の幅がアンテナ波長の約０．２５倍以下と成して
いるため、例えば携帯電話不感地帯用の基地局アンテナ
として用いる場合に十分な利得を有することになる。[0016] The dual beam antenna device of the present invention comprises:
Since the width in the direction along the longitudinal direction of the waveguide element of the dual beam antenna on the mounting surface of the dual beam antenna of the mounting bracket is about 0.25 times or less the antenna wavelength, for example, a base station for a mobile phone blind zone When used as an antenna, it has a sufficient gain.
【００１７】さらに、デュアルビームアンテナ装置にデ
ュアルビームアンテナとアンテナ設置部との距離を可変
調節するアンテナ取り付け距離可変手段を設ければ、ア
ンテナ取り付け距離可変手段によってデュアルビームア
ンテナとアンテナ設置部との距離を可変調節することに
より、デュアルビームの双方向指向性の開き角４０を所
望の開き角４０にすることができる。すなわち、デュア
ルビームアンテナ装置のアンテナ設置部に応じてデュア
ルビームアンテナとアンテナ設置部との距離を可変調節
すれば、デュアルビームの双方向指向性の開き角が所望
の角度となるデュアルビームアンテナ装置を得ることが
可能となる。Furthermore, if the dual beam antenna device is provided with an antenna mounting distance varying means for variably adjusting the distance between the dual beam antenna and the antenna installation section, the distance between the dual beam antenna and the antenna installation section can be changed by the antenna installation distance varying means. Is variably adjusted, the opening angle 40 of the dual beam bidirectional directivity can be set to a desired opening angle 40. That is, if the distance between the dual-beam antenna and the antenna installation section is variably adjusted according to the antenna installation section of the dual-beam antenna apparatus, a dual-beam antenna apparatus in which the open angle of the bidirectional directivity of the dual beam becomes a desired angle. It is possible to obtain.
【００１８】さらに、本発明のデュアルビームアンテナ
装置の取り付け構造においては、デュアルビームの双方
向指向性の開き角を予め定められた設定角度にする反射
板をアンテナ設置部に設けることにより、双方向指向性
の開き角を予め定められた設定角度にすることが可能と
なり、これらのことから、上記課題が解決される。Further, in the mounting structure of the dual beam antenna device according to the present invention, the reflector for setting the opening angle of the bidirectional bidirectional directivity of the dual beam to a predetermined angle is provided in the antenna installation portion, so that the bidirectional antenna is provided. The opening angle of the directivity can be set to a predetermined setting angle, and the above problem is solved.
【００１９】[0019]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。なお、本実施形態例の説明におい
て、従来例と同一名称部分には同一符号を付し、その重
複説明は省略する。図１には、本発明に係るデュアルビ
ームアンテナ装置の第１実施形態例の要部構成が斜視図
によって示されている。また、図２の（ａ）には、この
デュアルビームアンテナ装置の平面図が、同図の（ｂ）
にはデュアルビームアンテナ装置の側面図が、アンテナ
設置部としての壁面１９に取り付け状態でそれぞれ示さ
れている。Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same parts as those in the conventional example, and the duplicate description thereof will be omitted. FIG. 1 is a perspective view showing a configuration of a main part of a first embodiment of a dual beam antenna device according to the present invention. FIG. 2A is a plan view of the dual beam antenna device, and FIG.
2 shows a side view of the dual beam antenna device in a state where the dual beam antenna device is attached to a wall surface 19 as an antenna installation portion.
【００２０】これらの図に示されるように、本実施形態
例のデュアルビームアンテナ装置は、デュアルビームア
ンテナ９の背面側に、デュアルビームアンテナ９をアン
テナ設置部に取り付けるための取り付け金具６が設けら
れて形成されている。取り付け金具６は、本実施形態例
では、アンテナ設置部側の板部２８とこの板部２８から
張り出した張り出し部２６とデュアルビームアンテナ９
側の板部２９とを有して、断面がエ形状に形成されてお
り、例えばステンレスなどの金属部材により構成されて
いる。As shown in these figures, in the dual beam antenna device of the present embodiment, a mounting bracket 6 for mounting the dual beam antenna 9 to the antenna installation portion is provided on the back side of the dual beam antenna 9. It is formed. In this embodiment, the mounting bracket 6 includes a plate portion 28 on the antenna installation portion side, an overhang portion 26 protruding from the plate portion 28, and the dual beam antenna 9.
It has a plate portion 29 on the side and is formed in a D-shaped cross section, and is made of, for example, a metal member such as stainless steel.
【００２１】デュアルビームアンテナ９は、図３に示す
ように、例えばガラス繊維強化エポキシ樹脂やシリコン
樹脂等により形成された誘電体基板（基板）１に２基の
八木アンテナが設けられているアンテナ本体２０を立設
状態で、ＦＲＰ（Ｆｉｂｅｒ−ｇｌａｓｓ Ｒｅｉｎｆ
ｏｒｃｅｄ Ｐｌａｓｔｉｃ；ガラス繊維強化プラスチ
ック）製のレドーム８に収容して形成されており、この
ようにすることにより、デュアルビームアンテナ９の導
波素子の長手方向に沿う方向は、図１または図２の
（ｂ）の上下方向と成している。As shown in FIG. 3, the dual beam antenna 9 has an antenna body in which two Yagi antennas are provided on a dielectric substrate (substrate) 1 formed of, for example, a glass fiber reinforced epoxy resin or a silicon resin. 20 with the FRP (Fiber-glass Reinf)
Ordated Plastic (glass fiber reinforced plastic) is accommodated and formed in the radome 8. By doing so, the direction along the longitudinal direction of the waveguide element of the dual beam antenna 9 is the same as that shown in FIG. (B).
【００２２】本実施形態例の特徴的なことは、取り付け
金具６のデュアルビームアンテナ取り付け面１０におけ
るデュアルビームアンテナ９の導波素子４の長手方向に
沿う方向の幅Ｗ（同図の上下方向の幅）がアンテナ波長
λの約０．２５倍以下と成していることである。なお、
前記幅Ｗの下限値は、アンテナ設置部においてデュアル
ビームアンテナ９の動作等に支障がない（例えばデュア
ルビームアンテナ９が外れたりしない状態で取り付け具
６により支持できる）最小値となる。The feature of this embodiment is that the width W of the dual beam antenna 9 on the mounting surface 10 of the mounting member 6 in the direction along the longitudinal direction of the waveguide element 4 (the vertical direction in FIG. Width) is not more than about 0.25 times the antenna wavelength λ. In addition,
The lower limit value of the width W is a minimum value that does not hinder the operation of the dual beam antenna 9 at the antenna installation portion (for example, the width W can be supported by the attachment 6 in a state where the dual beam antenna 9 does not come off).
【００２３】本実施形態例では、図３に示したように、
放射素子３のパターンは、アース面２およびストリップ
ライン５、平衡二線３０を挟んで互い違いに形成されて
おり、放射素子３のパターンをこのようなパターンに形
成することにより、放射素子３は逆相励振される。そし
て、デュアルビームアンテナ９のデュアルビーム１１
は、図４に示すような八の字型指向性を有している。In this embodiment, as shown in FIG.
The pattern of the radiating element 3 is formed alternately with the ground plane 2, the strip line 5, and the balanced two lines 30 interposed therebetween. By forming the pattern of the radiating element 3 in such a pattern, the radiating element 3 is inverted. Excited. And the dual beam 11 of the dual beam antenna 9
Has an eight-shaped directivity as shown in FIG.
【００２４】また、放射素子３のパターンをこのように
形成し、かつ、同図に示すように、アース面２の幅Ａｗ
を除く放射素子３の配列ピッチ（図のＬＨｗ＋ＲＨｗ）
を約（１／２）λとした場合、アース面２の幅Ａｗを、
０を出発点として、λ、２λ、・・・とλ毎に変化させ
た場合に同じ励振特性を有するようになる（すなわち、
アース面２の幅Ａｗにより、この幅Ａｗが０を出発点と
して、λ、２λ、・・・となるごとに同じ励振特性が現
れることになる）ため、アース面２の幅Ａｗは、０、
λ、２λ、・・・といった値に設定されることになる
が、装置の小型化を考慮すると、アース面２の幅Ａｗ
は、０またはλとすることが好ましい。The pattern of the radiating element 3 is formed in this manner, and as shown in FIG.
Pitch of the radiating elements 3 excluding (LHw + RHw in the figure)
Is approximately (1/2) λ, the width Aw of the ground plane 2 is
Starting from 0, the same excitation characteristics will be obtained when changed for each λ, λ, 2λ,.
Since the width Aw of the ground plane 2 starts from 0, the same excitation characteristics appear every time the width Aw becomes λ, 2λ,...).
.lambda., 2.lambda.,..., but considering the miniaturization of the device, the width Aw of the ground plane 2 is considered.
Is preferably 0 or λ.
【００２５】ただし、アース面２の幅Ａｗを０とするこ
とはできないため、本実施形態例では、アース面２の幅
Ａｗを、約０．１λ以下または約λとしており、アース
面２の幅Ａｗを、約０．１λ以下とした場合にも、前記
励振特性に大きな変化はみられないことが確認されてい
る。However, since the width Aw of the ground plane 2 cannot be set to 0, in this embodiment, the width Aw of the ground plane 2 is set to about 0.1λ or less or about λ. It has been confirmed that even when Aw is set to about 0.1λ or less, no significant change is observed in the excitation characteristics.
【００２６】また、図６に示すように、アンテナ本体２
０は、レドーム８に取り付け用支持具１３を介して、誘
電体基板１の面とレドーム８の内壁とが間隔を介するよ
うにして設けられている。誘電体基板１の表面側、裏面
側のいずれがデュアルビームアンテナ９の背面側（取り
付け金具６側）と成していてもよい。また、デュアルビ
ームアンテナ装置をトンネル１２内に設けるときには、
デュアルビーム１１の放射方向がトンネル１２の長手方
向（図６の紙面に略垂直な方向）となるように設けられ
る。Further, as shown in FIG.
Numeral 0 is provided on the radome 8 via the mounting support 13 so that the surface of the dielectric substrate 1 and the inner wall of the radome 8 are spaced from each other. Either the front side or the back side of the dielectric substrate 1 may be the back side (the mounting bracket 6 side) of the dual beam antenna 9. When the dual beam antenna device is provided in the tunnel 12,
The radiation direction of the dual beam 11 is provided so as to be the longitudinal direction of the tunnel 12 (the direction substantially perpendicular to the plane of FIG. 6).
【００２７】そして、トンネル１２内に、トンネル１２
の長手方向に沿って設けられる図示されていない同軸ケ
ーブル等を、図１に鎖線で示した給電用のコネクタ１８
に接続し、ストリップライン５（５ａ）、ストリップラ
イン５（５ｂ）および平衡二線３０を介して放射素子３
に給電し、デュアルビームアンテナ９はデュアルビーム
１１を放射するようになっている。Then, in the tunnel 12, the tunnel 12
A coaxial cable or the like (not shown) provided along the longitudinal direction of the power supply connector 18 shown by a chain line in FIG.
To the radiating element 3 via the strip line 5 (5a), the strip line 5 (5b) and the balanced two-wire 30.
, And the dual beam antenna 9 radiates the dual beam 11.
【００２８】実施形態例のデュアルビームアンテナ装置
は以上のように構成されており、デュアルビームアンテ
ナ９のデュアルビーム１１は取り付け金具６により影響
を受けるため、本発明者が、この影響を調べるために、
様々な検討を行なったところ、デュアルビームアンテナ
９のデュアルビーム１１の利得は、取り付け金具６のデ
ュアルビームアンテナ取り付け面１０におけるデュアル
ビームアンテナ９の導波素子の長手方向に沿う方向の幅
Ｗによって変化することが分かった。図５に、本発明者
が前記幅Ｗとデュアルビームアンテナ９の利得との関係
を検討した結果を示す。The dual beam antenna device of the embodiment is configured as described above. Since the dual beam 11 of the dual beam antenna 9 is affected by the mounting bracket 6, the inventor has to examine this effect. ,
As a result of various investigations, the gain of the dual beam 11 of the dual beam antenna 9 varies depending on the width W of the dual beam antenna 9 on the mounting surface 10 of the mounting bracket 6 in the direction along the longitudinal direction of the waveguide element of the dual beam antenna 9. I found out. FIG. 5 shows the result of the present inventors examining the relationship between the width W and the gain of the dual beam antenna 9.
【００２９】なお、図５において、前記幅Ｗは、アンテ
ナ波長λを用いて示されており、デュアルビームアンテ
ナ９の利得は、図５においては、取り付け金具６を設け
ないときのデュアルビーム１１の利得（すなわちＷ＝０
のときの利得）を基準とした利得差により示されてい
る。In FIG. 5, the width W is shown using the antenna wavelength λ, and the gain of the dual beam antenna 9 is shown in FIG. 5 when the mounting bracket 6 is not provided. Gain (ie, W = 0
The gain difference on the basis of the gain at the time of (1) is shown.
【００３０】同図から明らかなように、前記幅Ｗをアン
テナ波長λの約０．２５倍以下とすると、前記利得差を
−０．３ｄＢ以内とすることができ、例えば携帯電話不
感地帯用の基地局アンテナとして用いる場合に十分な値
となることが分かった。なお、図５には、取り付け金具
６のデュアルビームアンテナ取り付け面１０とアンテナ
本体２０との距離はλ／８として実験を行なった結果を
示したが、前記幅Ｗとデュアルビームアンテナ９の利得
との関係を検討する際、取り付け金具６のデュアルビー
ムアンテナ取り付け面１０とアンテナ本体２０との距離
をλ／８以外としても、前記幅Ｗをアンテナ波長λの約
０．２５倍以下とすれば、例えばトンネル１２内などの
携帯電話不感地帯用の基地局アンテナとして用いる場合
に必要な十分な利得が得られることが分かった。As can be seen from the figure, when the width W is set to about 0.25 times or less of the antenna wavelength λ, the gain difference can be made within −0.3 dB. It turned out that the value is sufficient when used as a base station antenna. FIG. 5 shows the result of an experiment in which the distance between the dual-beam antenna mounting surface 10 of the mounting bracket 6 and the antenna body 20 was λ / 8, but the width W, the gain of the dual-beam antenna 9 and In examining the relationship, if the distance between the dual-beam antenna mounting surface 10 of the mounting bracket 6 and the antenna body 20 is other than λ / 8, if the width W is set to about 0.25 times or less the antenna wavelength λ, For example, it has been found that a sufficient gain required when used as a base station antenna for a mobile phone blind zone such as in a tunnel 12 can be obtained.
【００３１】本発明のデュアルビームアンテナ装置は、
上記検討結果に基づき、取り付け金具６のデュアルビー
ムアンテナ取り付け面１０におけるデュアルビームアン
テナ９の導波素子４の長手方向に沿う方向の幅Ｗをアン
テナ波長の約０．２５倍以下と成したため、例えばトン
ネル１２内などの携帯電話不感地帯用の基地局アンテナ
として用いる場合に必要な十分な利得を得ることができ
る。The dual beam antenna device of the present invention
Based on the results of the above study, the width W in the direction along the longitudinal direction of the waveguide element 4 of the dual beam antenna 9 on the dual beam antenna mounting surface 10 of the mounting bracket 6 was set to be about 0.25 times or less the antenna wavelength. A sufficient gain required when used as a base station antenna for a mobile phone blind zone such as in a tunnel 12 can be obtained.
【００３２】図７には、本発明に係るデュアルビームア
ンテナ装置の第２実施形態例の断面構成が、アンテナ設
置部としての壁面１９への取り付け状態で示されてい
る。なお、本実施形態例でもデュアルビームアンテナ９
は上記第１実施形態例と同様に構成されているが、同図
においては、デュアルビームアンテナ９におけるアンテ
ナ本体２０のレドーム８への取り付け構成は省略して示
してある。FIG. 7 shows a cross-sectional structure of a dual-beam antenna device according to a second embodiment of the present invention in a state where the dual-beam antenna device is mounted on a wall 19 as an antenna installation portion. In this embodiment, the dual beam antenna 9 is also used.
Is configured in the same manner as in the first embodiment, but the illustration of the dual beam antenna 9 in which the antenna main body 20 is attached to the radome 8 is omitted.
【００３３】本第２実施形態例は上記第１実施形態例と
ほぼ同様に構成されており、本第２実施形態例が上記第
１実施形態例と異なる特徴的なことは、デュアルビーム
アンテナ９とアンテナ設置部との距離ｃ（具体的には壁
面１９とアンテナ本体２０との距離）を可変調節するア
ンテナ取り付け距離可変手段が設けられていることであ
る。The structure of the second embodiment is substantially the same as that of the first embodiment. The difference between the second embodiment and the first embodiment is that the dual beam antenna 9 Antenna mounting distance varying means for variably adjusting the distance c (specifically, the distance between the wall surface 19 and the antenna body 20) between the antenna mounting portion and the antenna mounting portion.
【００３４】すなわち、本第２実施形態例では、取り付
け金具６は、例えばトンネル１２などの壁面１９側の第
１部材２２と、デュアルビームアンテナ９側の第２部材
２３とを有し、第１部材２２の張り出し部２６に設けた
挿入凹部２４に第２部材２３の支持板部２５が挿入嵌合
されている。第１部材２２の張り出し部２６には、前記
挿入凹部２４の上下両側に、図の左右方向を長手方向と
する長穴１４が形成されており、一方、第２部材２３の
支持板部２５には、ねじ穴１５が形成されている。第１
部材２２の張り出し部２６の上側からねじ１６が長穴１
４に挿入されてねじ穴１５と螺合し、さらに、ねじ１６
は第１部材２２の張り出し部の下側の長穴１４を貫通し
てナット１７により固定されている。なお、長穴１４の
長手方向の長さは、ねじ穴１５の径よりも大きく形成さ
れている。That is, in the second embodiment, the mounting bracket 6 has the first member 22 on the wall surface 19 side such as the tunnel 12 and the second member 23 on the dual beam antenna 9 side, for example. The support plate portion 25 of the second member 23 is inserted and fitted into the insertion concave portion 24 provided in the projecting portion 26 of the member 22. In the overhang portion 26 of the first member 22, elongated holes 14 whose longitudinal direction is the left-right direction in the drawing are formed on both upper and lower sides of the insertion concave portion 24, while the support plate portion 25 of the second member 23 is formed. Has a screw hole 15 formed therein. First
The screw 16 from the upper side of the overhang portion 26 of the member 22
4 and screwed into the screw hole 15,
Is fixed by a nut 17 through the elongated hole 14 below the overhang of the first member 22. The length of the elongated hole 14 in the longitudinal direction is formed larger than the diameter of the screw hole 15.
【００３５】ねじ１６を締めて固定することにより、第
１部材２２の前記挿入凹部２４に第２部材２３の支持板
部２５が固定され、それにより、第１部材２２と第２部
材２３とが固定されるようになっており、ねじ１６の位
置を長穴１４の長手方向に可変することにより、第１部
材２２の前記挿入凹部２４への第２部材２３の支持板部
２５の挿入長さが可変され、デュアルビームアンテナ９
とアンテナ設置部（同図では壁面１９）との距離ｃを可
変調節する構成と成しており、本実施形態例では、前記
アンテナ取り付け距離可変手段が、挿入凹部２４と長穴
１４を有する張り出し部２６と、ねじ穴１５を有する支
持板部２５と、ねじ１６とを有して構成されている。By tightening and fixing the screw 16, the support plate 25 of the second member 23 is fixed to the insertion recess 24 of the first member 22, whereby the first member 22 and the second member 23 are separated. The insertion length of the support plate 25 of the second member 23 into the insertion recess 24 of the first member 22 by changing the position of the screw 16 in the longitudinal direction of the elongated hole 14. Is changed, and the dual beam antenna 9
In this embodiment, the antenna mounting distance changing means comprises an overhang having an insertion recess 24 and an elongated hole 14. It has a portion 26, a support plate portion 25 having a screw hole 15, and a screw 16.
【００３６】本第２実施形態例は以上のように構成され
ており、必要に応じ、ねじ１６の位置を長穴１４の長手
方向に可変することにより、第１部材２２の前記挿入凹
部２４への第２部材２３の支持板部２５の挿入長さを可
変し、デュアルビームアンテナ９とアンテナ設置部との
距離ｃを可変する。そうすると、前記距離ｃの変化に応
じてデュアルビームアンテナ９から放射されるデュアル
ビーム１１の双方向指向性の開き角４０（すなわち、本
実施形態例では、デュアルビーム１１の八の字型指向性
の開き角）が変化する。The second embodiment is constructed as described above. If necessary, the position of the screw 16 can be changed in the longitudinal direction of the elongated hole 14 so that the screw 16 can be inserted into the insertion recess 24 of the first member 22. The insertion length of the support plate portion 25 of the second member 23 is changed, and the distance c between the dual beam antenna 9 and the antenna installation portion is changed. Then, the opening angle 40 of the bidirectional directivity of the dual beam 11 radiated from the dual beam antenna 9 in accordance with the change in the distance c (that is, in the present embodiment, the figure-of-eight directivity of the dual beam 11). Opening angle) changes.
【００３７】したがって、本第２実施形態例によれば、
アンテナ取り付け距離可変手段によって、デュアルビー
ムアンテナ９と壁面１９との距離ｃを可変調節すること
により、デュアルビーム１１の双方向指向性の開き角４
０を所望の開き角４０にすることができ、デュアルビー
ムアンテナ装置のアンテナ設置部に応じてデュアルビー
ムアンテナとアンテナ設置部との距離を可変調節すれ
ば、デュアルビーム１１の双方向指向性の開き角４０を
所望の開き角４０にすることができる。Therefore, according to the second embodiment,
The distance c between the dual beam antenna 9 and the wall surface 19 is variably adjusted by the antenna mounting distance varying means, so that the bidirectional directivity opening angle 4 of the dual beam 11 is adjusted.
0 can be set to a desired opening angle of 40, and if the distance between the dual beam antenna and the antenna installation section is variably adjusted according to the antenna installation section of the dual beam antenna device, the bidirectional directivity of the dual beam 11 can be increased. The corner 40 can be a desired opening angle 40.
【００３８】すなわち、本第２実施形態例によれば、例
えばデュアルビームアンテナ装置の出荷段階では前記距
離ｃを予め定めた設定距離に設定しておき、その後、実
際にデュアルビームアンテナ装置をアンテナ設置部に取
り付けるときに、アンテナ取り付け距離可変手段によっ
て、前記距離ｃを可変調節することにより、アンテナ設
置部の状態（例えばアンテナ設置部付近のトンネルがほ
ぼまっすぐに形成されているか、あるいはカーブしてい
るか等）によって、前記距離ｃを可変し、デュアルビー
ム１１の双方向指向性の開き角４０を最も適切な開き角
４０に近づけることができる。That is, according to the second embodiment, for example, at the time of shipping the dual beam antenna device, the distance c is set to a predetermined set distance, and then the dual beam antenna device is actually installed. When the antenna is mounted on the antenna, the distance c is variably adjusted by an antenna mounting distance variable unit, so that the state of the antenna installation part (for example, whether the tunnel near the antenna installation part is formed almost straight or curved) Etc.), the distance c can be varied, and the opening angle 40 of the bidirectional directivity of the dual beam 11 can be made closer to the most appropriate opening angle 40.
【００３９】図８には、本発明に係るデュアルビームア
ンテナ装置の取り付け構造の一実施形態例が平面図によ
り示されている。本実施形態例を適用するデュアルビー
ムアンテナ装置は、上記第１または第２実施形態例のデ
ュアルビームアンテナ装置であり、同図において、デュ
アルビームアンテナ装置の詳細な構成は省略して示して
あり、また、デュアルビームアンテナ装置の詳細な構成
の説明は省略する。FIG. 8 is a plan view showing an embodiment of the mounting structure of the dual beam antenna device according to the present invention. The dual-beam antenna device to which the present embodiment is applied is the dual-beam antenna device of the first or second embodiment described above, and the detailed configuration of the dual-beam antenna device is omitted in FIG. Also, a detailed description of the configuration of the dual beam antenna device is omitted.
【００４０】本実施形態例のデュアルビームアンテナ装
置の取り付け構造の特徴的なことは、デュアルビームア
ンテナ装置の双方向指向性（具体的には、本実施形態例
では八の字型指向性）の開き角４０を予め定められた設
定角度にする反射板７を、アンテナ設置部としてのトン
ネル壁面１９に設けたことである。反射板７は金属によ
り形成されており、反射板７の表面２７の面積はアンテ
ナ本体２０の基板面の面積よりも大きく形成されてい
る。例えば、デュアルビーム１１のビーム周波数が１．
５ＧＨｚのときには、６００ｍｍ×８００ｍｍの長方形
状の表面２７形状を有する金属製反射板７が用いられ
る。その他、金属板として、金属メッシュも使用でき
る。A feature of the mounting structure of the dual beam antenna device of the present embodiment is that the dual beam antenna device has a bidirectional directivity (specifically, an eight-shaped directivity in the present embodiment). That is, the reflecting plate 7 for setting the opening angle 40 to a predetermined setting angle is provided on the tunnel wall 19 as an antenna installation portion. The reflector 7 is made of metal, and the area of the surface 27 of the reflector 7 is larger than the area of the substrate surface of the antenna body 20. For example, if the beam frequency of the dual beam 11 is 1.
At 5 GHz, a metal reflector 7 having a rectangular surface 27 shape of 600 mm × 800 mm is used. In addition, a metal mesh can be used as the metal plate.
【００４１】デュアルビームアンテナ装置をトンネル１
２内などに設ける場合は、一般にはデュアルビーム１１
の双方向指向性の開き角４０は１８０度に近い方がよい
が、前記の如く、デュアルビームアンテナ装置をトンネ
ル１２の壁面１９や天井などに近づけると開き角４０が
１８０度よりも小さくなってしまう。この開き角４０の
変化は、壁面１９などのアンテナ設置部の状態によって
も異なるものであるが、壁面１９などを形成しているコ
ンクリートなどに比べ、金属は前記開き角４０に与える
影響が大きいため、本実施形態例では、金属の反射板７
をアンテナ設置部に設け、それにより、アンテナ設置部
の状態による開き角４０の変化が生じないようにした。Tunnel 1 with dual beam antenna device
2 or the like, generally a dual beam 11
It is preferable that the opening angle 40 of the bidirectional directivity is close to 180 degrees, but as described above, when the dual beam antenna device is brought closer to the wall surface 19 or the ceiling of the tunnel 12, the opening angle 40 becomes smaller than 180 degrees. I will. The change in the opening angle 40 varies depending on the state of the antenna installation portion such as the wall surface 19. However, compared to concrete or the like forming the wall surface 19 or the like, metal has a large effect on the opening angle 40. In this embodiment, the metal reflection plate 7 is used.
Is provided in the antenna installation portion, so that the opening angle 40 does not change depending on the state of the antenna installation portion.
【００４２】また、デュアルビーム１１の双方向指向性
の開き角４０を予め定めた設定角度にするために、デュ
アルビームアンテナ９と反射板７との距離ｄ（具体的に
はアンテナ本体２０と反射板の表面２７との距離）を可
変し、この距離ｄと開き角４０との相関データを求め
た。その結果が図９に示されており、同図に示すよう
に、反射板７とデュアルビームアンテナ９との距離ｄが
大きくなるにつれて、デュアルビーム１１の双方向指向
性の開き角４０は徐々に大きくなる傾向を示している。
なお、同図において、λは、デュアルビームアンテナ９
のアンテナ波長を示している。Further, in order to set the opening angle 40 of the bidirectional directivity of the dual beam 11 to a predetermined angle, the distance d between the dual beam antenna 9 and the reflector 7 (specifically, the distance d (The distance from the plate surface 27) was varied, and correlation data between the distance d and the opening angle 40 was obtained. The result is shown in FIG. 9. As shown in FIG. 9, as the distance d between the reflector 7 and the dual beam antenna 9 increases, the opening angle 40 of the bidirectional directivity of the dual beam 11 gradually increases. It shows a tendency to increase.
In the figure, λ is the dual beam antenna 9
Are shown.
【００４３】この検討に際し、上記第１実施形態例のデ
ュアルビームアンテナ装置を用いる場合は、前記距離ｄ
に応じて張り出し部２６の長さの異なる複数の取り付け
具６を用意し、張り出し部２６の長さの異なる各取り付
け具６に取り付けたデュアルビームアンテナ９を動作さ
せてデュアルビーム１１の双方向指向性の開き角４０を
測定すれば、距離ｄと開き角４０との関係を求めること
ができるが、上記第２実施形態例のデュアルビームアン
テナ装置を用いれば、前記アンテナ取り付け距離可変手
段によってデュアルビームアンテナ９と反射板７の表面
２７との距離を可変することにより、１つのデュアルビ
ームアンテナ装置を用いても容易に距離ｄと開き角４０
との関係を求めることができる。In this study, when the dual beam antenna device of the first embodiment is used, the distance d
A plurality of fixtures 6 having different lengths of the overhanging portions 26 are prepared according to the conditions, and the dual beam antenna 9 attached to each of the fittings 6 having the different lengths of the overhanging portions 26 is operated so that the bidirectional directivity of the dual beam 11 is controlled. The relationship between the distance d and the opening angle 40 can be obtained by measuring the divergence angle 40 of the sex. However, if the dual beam antenna device of the second embodiment is used, the dual beam antenna By changing the distance between the antenna 9 and the surface 27 of the reflector 7, even if one dual beam antenna device is used, the distance d and the opening angle 40 can be easily adjusted.
You can ask for the relationship.
【００４４】本実施形態例では、図９に示したようなデ
ータに基づき、例えばデュアルビームアンテナ装置を設
置するアンテナ設置部の領域がほぼまっすぐに形成され
ている場合は、距離ｄをデュアルビーム波長λに近い値
としてデュアルビーム１１の双方向指向性の開き角４０
を１８０度に近づけ、アンテナ設置部の領域がカーブし
ていて前記開き角４０を例えば１４０度にしたい場合
は、距離ｄをデュアルビーム波長の約０．７倍とするこ
とにより、開き角４０を１４０度にする。In this embodiment, based on the data as shown in FIG. 9, if the area of the antenna installation section where the dual beam antenna device is installed is formed almost straight, for example, the distance d is set to the dual beam wavelength. An opening angle 40 of the bidirectional directivity of the dual beam 11 as a value close to λ
Is approached to 180 degrees, and if the area of the antenna installation section is curved and the opening angle 40 is to be set to, for example, 140 degrees, the distance d is set to about 0.7 times the dual beam wavelength, so that the opening angle 40 is increased. To 140 degrees.
【００４５】本実施形態例によれば、上記のようにし
て、デュアルビーム１１の双方向指向性の開き角４０を
設定角度にすることができるために、アンテナ設置部に
応じて適切な所望の開き角４０を得ることができる。According to the present embodiment, the opening angle 40 of the bidirectional directivity of the dual beam 11 can be set to the set angle as described above. An opening angle 40 can be obtained.
【００４６】なお、本発明は上記実施形態例に限定され
ることはなく様々な実施の態様を採り得る。例えば、デ
ュアルビームアンテナ装置の取り付け構造の実施形態例
においては、反射板７の表面２７の面積が６００ｍｍ×
８００ｍｍとなるようにしたが、反射板７の大きさは特
に限定されるものではなく、適宜設定されるものであ
り、例えばデュアルビームアンテナ装置から放射される
デュアルビーム１１の双方向指向性の開き角４０が、ア
ンテナ設置部の影響を受けずに、予め定めた設定角度と
なるようにできる反射板７を、アンテナ設置部に取り付
ければよい。The present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in the embodiment of the mounting structure of the dual beam antenna device, the area of the surface 27 of the reflector 7 is 600 mm ×
Although it was set to be 800 mm, the size of the reflector 7 is not particularly limited and may be appropriately set. For example, the size of the bidirectional directivity of the dual beam 11 radiated from the dual beam antenna device may be increased. It is sufficient to attach the reflector 7 that allows the angle 40 to have a predetermined set angle without being affected by the antenna installation section.
【００４７】また、上記各実施形態例では、デュアルビ
ームアンテナ装置のデュアルビームアンテナ９は、図３
に示したように、誘電体基板１に、アース面２およびス
トリップライン５に対して互い違いに放射素子３を形成
したアンテナ本体２０を設けたが、アンテナ本体２０
は、例えば図１０に示すように、アース面２に対して対
称に放射素子３を誘電体基板１に形成したものでもよ
い。In each of the above embodiments, the dual beam antenna 9 of the dual beam antenna device is
As shown in the figure, the antenna body 20 in which the radiating element 3 is formed on the dielectric substrate 1 alternately with respect to the ground plane 2 and the strip line 5 is provided.
For example, as shown in FIG. 10, a radiating element 3 may be formed on the dielectric substrate 1 symmetrically with respect to the ground plane 2.
【００４８】図１０に示すように放射素子３のパターン
を形成した場合は、放射素子３は同相励振され、デュア
ルビームアンテナ９から放射されるデュアルビーム１１
は、例えば図１１に示すような双方向指向性を有するデ
ュアルビーム１１となる。When the pattern of the radiating element 3 is formed as shown in FIG. 10, the radiating element 3 is excited in-phase, and the dual beam 11 radiated from the dual beam antenna 9 is emitted.
Becomes a dual beam 11 having bidirectional directivity as shown in FIG. 11, for example.
【００４９】また、このように、放射素子３のパターン
をアース面２に対して対称となるように形成し、かつ、
アース面２の幅Ａｗを除く放射素子３の配列ピッチ（図
のＬＨｗ＋ＲＨｗ）を（１／２）λとした場合、図１０
に示すアース面２の幅Ａｗを、（１／２）λを出発点と
して、（１／２）λ、（３／２）λ、・・・と（１／
２）λ毎に変化させた場合に同じ励振特性を有するよう
になる（すなわち、アース面２の幅Ａｗにより、この幅
Ａｗが（１／２）λを出発点として、（１／２）λ、
（３／２）λ、・・・となるごとに同じ励振特性が現れ
ることになる）ため、アース面２の幅Ａｗは、（１／
２）λ、（３／２）λ、・・・といった値に設定される
ことになるが、装置の小型化を考慮すると、アース面２
の幅Ａｗは、約（１／２）λとすることが好ましい。Further, as described above, the pattern of the radiating element 3 is formed so as to be symmetric with respect to the ground plane 2, and
When the arrangement pitch of the radiating elements 3 (LHw + RHw in the figure) excluding the width Aw of the ground plane 2 is (1/2) λ, FIG.
The width Aw of the ground plane 2 shown in (1) is defined as (1/2) λ, (3/2) λ,.
2) When changed for every λ, the same excitation characteristic is obtained (that is, the width Aw of the ground plane 2 causes the width Aw to be (1/2) λ starting from (1/2) λ). ,
(3/2) λ,..., The same excitation characteristic appears every time.)
2) are set to values such as λ, (3/2) λ,...
Is preferably about (1/2) λ.
【００５０】さらに、上記第２実施形態例のデュアルビ
ームアンテナ装置は、アンテナ取り付け距離可変手段
は、挿入凹部２４と長穴１４を有する張り出し部２６
と、ねじ穴１５を有する支持板部２５、ねじ１６を設け
て構成したが、アンテナ取り付け距離可変手段を構成す
る構成要素は特に限定されるものではなく、適宜設定さ
れるものであり、例えば、ねじなどを操作することによ
り、デュアルビームアンテナ９がアンテナ設置部の設置
面とほぼ直交する方向にスライド移動するような機構を
設け、この機構をアンテナ取り付け距離可変手段として
もよい。Further, in the dual beam antenna device according to the second embodiment, the antenna mounting distance changing means includes an insertion recess 24 and a projecting portion 26 having an elongated hole 14.
And the support plate portion 25 having the screw hole 15 and the screw 16 are provided. However, the components constituting the antenna mounting distance varying means are not particularly limited, and are appropriately set. A mechanism may be provided so that the dual beam antenna 9 slides in a direction substantially perpendicular to the installation surface of the antenna installation section by operating a screw or the like, and this mechanism may be used as an antenna installation distance variable unit.
【００５１】[0051]
【発明の効果】本発明のデュアルビームアンテナ装置に
よれば、デュアルビームアンテナの背面側にはデュアル
ビームアンテナをアンテナ設置部に取り付けるための取
り付け金具が設けられているため、例えば鉄道トンネル
内等の車体が通過するときに生じる風圧が高い場所にデ
ュアルビームアンテナ装置を取り付けても、その風圧な
どに耐えることができる。According to the dual beam antenna device of the present invention, since the mounting bracket for mounting the dual beam antenna to the antenna installation portion is provided on the back side of the dual beam antenna, for example, in a railway tunnel or the like. Even if the dual beam antenna device is mounted in a place where the wind pressure generated when the vehicle passes is high, the dual beam antenna device can withstand the wind pressure and the like.
【００５２】また、デュアルビームアンテナ装置におい
て、デュアルビームアンテナのデュアルビームは取り付
け金具により影響を受けることになるが、本発明者が、
取り付け金具のデュアルビームアンテナ取り付け面にお
けるデュアルビームアンテナの導波素子の長手方向に沿
う方向の幅とデュアルビームアンテナの利得との関係を
調べたところ、前記幅をアンテナ波長の約０．２５倍以
下とすると、前記利得を例えば携帯電話不感地帯用の基
地局アンテナとして用いる場合に十分な値となることが
分かり、このことに基づいて、本発明のデュアルビーム
アンテナ装置は、取り付け金具のデュアルビームアンテ
ナ取り付け面におけるデュアルビームアンテナの導波素
子の長手方向に沿う方向の幅をアンテナ波長の約０．２
５倍以下としたため、例えば携帯電話不感地帯用の基地
局アンテナとして用いる場合に十分な利得を有すること
ができる。In the dual beam antenna device, the dual beam of the dual beam antenna is affected by the mounting bracket.
When the relationship between the width of the dual-beam antenna in the direction along the longitudinal direction of the waveguide element on the mounting surface of the dual-beam antenna and the gain of the dual-beam antenna was examined, the width was set to about 0.25 times or less the antenna wavelength. Then, it can be understood that the gain becomes a sufficient value when used as a base station antenna for a mobile phone blind zone, for example, and based on this, the dual beam antenna device of the present invention has The width of the mounting surface in the direction along the longitudinal direction of the waveguide element of the dual beam antenna is set to about 0.2 of the antenna wavelength.
Since it is 5 times or less, sufficient gain can be obtained, for example, when used as a base station antenna for a mobile phone blind zone.
【００５３】さらに、デュアルビームアンテナとアンテ
ナ設置部との距離を可変調節するアンテナ取り付け距離
可変手段を設けた構成のものにおいては、アンテナ取り
付け距離可変手段によってデュアルビームアンテナとア
ンテナ設置部との距離を可変調節することにより、デュ
アルビームの双方向指向性の開き角を例えば所望の開き
角にすることができるために、デュアルビームアンテナ
装置のアンテナ設置部に応じてデュアルビームアンテナ
とアンテナ設置部との距離を可変調節することにより、
所望のデュアルビーム指向性の開き角に近づけることが
でき、適切な開き角に近づけることができる。そのた
め、例えば携帯電話不感地帯用の基地局アンテナとして
適切なデュアルビームアンテナ装置とすることができ
る。Further, in a configuration in which the antenna mounting distance varying means for variably adjusting the distance between the dual beam antenna and the antenna installation section is provided, the distance between the dual beam antenna and the antenna installation section is changed by the antenna installation distance varying means. By variably adjusting, the opening angle of the bidirectional directivity of the dual beam can be set to a desired opening angle, for example, so that the dual beam antenna and the antenna By variably adjusting the distance,
The desired opening angle of the dual beam directivity can be approached, and an appropriate opening angle can be approached. Therefore, for example, a dual beam antenna device suitable as a base station antenna for a mobile phone blind zone can be provided.
【００５４】さらに、本発明のデュアルビームアンテナ
装置の取り付け構造によれば、双方向指向性の開き角を
予め定められた設定角度にする反射板をアンテナ設置部
に設けることにより、双方向指向性の開き角を予め定め
られた設定角度にすることができるので、アンテナ設置
部の状態等の影響を受けることなく、デュアルビームア
ンテナ装置を双方向指向性の開き角が適切な値となるよ
うに取り付けることができる。したがって、デュアルビ
ームアンテナ装置を、例えば携帯電話不感地帯用の基地
局アンテナとして用いることができる。Further, according to the mounting structure of the dual beam antenna device of the present invention, the reflector for setting the opening angle of the bidirectional directivity to a predetermined setting angle is provided in the antenna installation portion, so that the bidirectional directivity is provided. Can be set to a predetermined set angle, without being affected by the state of the antenna installation portion, etc., so that the opening angle of the bidirectional directivity of the dual beam antenna device becomes an appropriate value. Can be attached. Therefore, the dual beam antenna device can be used, for example, as a base station antenna for a mobile phone blind zone.
【図１】本発明に係るデュアルビームアンテナ装置の第
１実施形態例を示す要部構成図である。FIG. 1 is a main part configuration diagram showing a first embodiment of a dual beam antenna device according to the present invention.
【図２】上記第１実施形態例のデュアルビームアンテナ
装置の構成をアンテナ設置部への取り付け状態で示す平
面図（ａ）と側面図（ｂ）である。FIG. 2 is a plan view (a) and a side view (b) showing a configuration of the dual beam antenna device of the first embodiment in a state where the dual beam antenna device is attached to an antenna installation portion.
【図３】デュアルビームアンテナ装置に設けられるアン
テナ本体の構成を示す正面図（ａ）、平面図（ｂ）、背
面図（ｃ）である。FIG. 3 is a front view (a), a plan view (b), and a rear view (c) showing a configuration of an antenna main body provided in the dual beam antenna device.
【図４】図３に示すアンテナ本体を有するデュアルビー
ムアンテナ装置から放射されるデュアルビームの指向性
を示すグラフである。4 is a graph showing directivity of a dual beam radiated from a dual beam antenna device having the antenna body shown in FIG.
【図５】上記第１実施形態例のデュアルビームアンテナ
装置において、取り付け金具のデュアルビームアンテナ
取り付け面におけるデュアルビームアンテナの導波素子
の長手方向に沿う方向の幅とデュアルビームアンテナの
利得との関係を調べた結果を示すグラフである。FIG. 5 is a diagram illustrating the relationship between the width of the dual-beam antenna mounting surface of the mounting bracket in the direction along the longitudinal direction of the waveguide element and the gain of the dual-beam antenna in the dual-beam antenna device of the first embodiment. 9 is a graph showing the results of examining.
【図６】デュアルビームアンテナ装置のトンネル内への
取り付け状態例を示す説明図である。FIG. 6 is an explanatory diagram showing an example of a mounting state of a dual beam antenna device in a tunnel.
【図７】本発明に係るデュアルビームアンテナ装置の第
２実施形態例を示す要部断面構成図である。FIG. 7 is a cross-sectional view illustrating a main part of a dual beam antenna device according to a second embodiment of the present invention.
【図８】本発明に係るデュアルビームアンテナ装置の取
り付け構造の一実施形態例を示す要部平面構成図であ
る。FIG. 8 is a plan view showing a main part of an embodiment of a mounting structure of a dual beam antenna device according to the present invention.
【図９】図８に示したデュアルビームアンテナ装置の取
り付け構造におけるデュアルビームアンテナと反射板と
の距離ｄとデュアルビームの開き角との関係を示すグラ
フである。9 is a graph showing a relationship between a distance d between a dual beam antenna and a reflector and an opening angle of the dual beam in the mounting structure of the dual beam antenna device shown in FIG.
【図１０】デュアルビームアンテナ装置に設けられるア
ンテナ本体の他の構成例を示す正面図（ａ）、平面図
（ｂ）、背面図（ｃ）である。FIG. 10 is a front view (a), a plan view (b), and a rear view (c) showing another configuration example of the antenna main body provided in the dual beam antenna device.
【図１１】図１０に示すアンテナ本体を有するデュアル
ビームアンテナ装置から放射されるデュアルビームの指
向性を示すグラフである。11 is a graph showing directivity of a dual beam radiated from a dual beam antenna device having the antenna body shown in FIG.
【図１２】基板に１つの八木アンテナを設けたアンテナ
の構成を、八木アンテナに給電が行われたときの電界方
向と磁界方向を共に、正面図（ａ）と平面図（ｂ）によ
って示す説明図である。FIGS. 12A and 12B are a front view and a plan view showing the configuration of an antenna having one Yagi antenna provided on a substrate, showing both the electric field direction and the magnetic field direction when power is supplied to the Yagi antenna. FIG.
【図１３】アンテナビームの八の字型指向性の理想図を
示すグラフである。FIG. 13 is a graph showing an ideal figure of the figure eight directivity of the antenna beam.
【図１４】八の字型指向性のアンテナビームを放射する
デュアルビームアンテナを壁面に近づけたときに生じる
アンテナビームの指向性の開き角変化状態を示す説明図
である。FIG. 14 is an explanatory diagram showing a state in which the opening angle of the directivity of the antenna beam changes when a dual beam antenna that emits an antenna beam having an eight-shaped directivity is brought close to a wall surface.
１ 誘電体基板 ２ アース面 ３ 放射素子 ４ 導波素子 ５ ストリップライン ６ 取り付け金具 ７ 反射板 ８ レドーム ９ デュアルビームアンテナ １０ 取り付け面 １１ デュアルビーム １２ トンネル １３ 取り付け用支持具 １９ 壁面 ３０ 平衡二線 ４０ 開き角 DESCRIPTION OF SYMBOLS 1 Dielectric substrate 2 Ground plane 3 Radiation element 4 Waveguide element 5 Strip line 6 Mounting bracket 7 Reflector 8 Radome 9 Dual beam antenna 10 Mounting surface 11 Dual beam 12 Tunnel 13 Mounting support 19 Wall surface 30 Balanced double wire 40 Open Corner
───────────────────────────────────────────────────── フロントページの続き (72)発明者 阿部 広昭 東京都中央区八丁堀４丁目７番１号 日本 テレコム株式会社内 Ｆターム(参考） 5J020 AA03 BA06 BC09 DA03 5J021 AA02 AA07 AA12 AB03 BA01 CA03 DA03 GA02 HA02 HA05 HA10 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Abe 4-7-1 Hatchobori, Chuo-ku, Tokyo Japan Telecom Co., Ltd. F-term (reference) 5J020 AA03 BA06 BC09 DA03 5J021 AA02 AA07 AA12 AB03 BA01 CA03 DA03 GA02 HA02 HA05 HA10
Claims (3)
アンテナビームが双方向指向性を有するデュアルビーム
アンテナを有し、該デュアルビームアンテナの背面側に
は該デュアルビームアンテナをアンテナ設置部に取り付
けるための取り付け金具が設けられており、該取り付け
金具の前記デュアルビームアンテナ取り付け面は該デュ
アルビームアンテナの導波素子の長手方向に沿う方向の
幅がアンテナ波長の約０．２５倍以下と成していること
を特徴とするデュアルビームアンテナ装置。1. A dual-beam antenna having two Yagi antennas provided on a substrate and having an antenna beam having two-way directivity, and the dual-beam antenna is provided on an antenna installation portion on the back side of the dual-beam antenna. A mounting bracket for mounting is provided, and the width of the mounting surface of the dual-beam antenna in the direction along the longitudinal direction of the waveguide element of the dual-beam antenna is about 0.25 times or less the antenna wavelength. A dual-beam antenna device.
部との距離を可変調節するアンテナ取り付け距離可変手
段が設けられていることを特徴とする請求項１記載のデ
ュアルビームアンテナ装置。2. The dual beam antenna device according to claim 1, further comprising an antenna attachment distance varying means for variably adjusting a distance between the dual beam antenna and the antenna installation portion.
ームアンテナ装置の取り付け構造であって、アンテナビ
ームの双方向指向性の開き角を予め定められた設定角度
にする反射板をアンテナ設置部に設けたことを特徴とす
るデュアルビームアンテナ装置の取り付け構造。3. The mounting structure of the dual beam antenna device according to claim 1, wherein the reflector for setting the opening angle of the bidirectional directivity of the antenna beam to a predetermined setting angle is provided. A mounting structure for a dual-beam antenna device, the mounting structure comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02636699A JP3734975B2 (en) | 1999-02-03 | 1999-02-03 | Dual beam antenna device and mounting structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02636699A JP3734975B2 (en) | 1999-02-03 | 1999-02-03 | Dual beam antenna device and mounting structure thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000223943A true JP2000223943A (en) | 2000-08-11 |
| JP3734975B2 JP3734975B2 (en) | 2006-01-11 |
Family
ID=12191511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02636699A Expired - Lifetime JP3734975B2 (en) | 1999-02-03 | 1999-02-03 | Dual beam antenna device and mounting structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3734975B2 (en) |
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1999
- 1999-02-03 JP JP02636699A patent/JP3734975B2/en not_active Expired - Lifetime
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| JP2006254418A (en) * | 2005-02-08 | 2006-09-21 | Yagi Antenna Co Ltd | Bidirectional beam antenna and transmission system |
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| JP2007312141A (en) * | 2006-05-18 | 2007-11-29 | Iguchi Tetsuji | Plate antenna |
| JP2009038824A (en) * | 2008-09-26 | 2009-02-19 | Denki Kogyo Co Ltd | Dipole horizontal array antenna apparatus |
| CN112397886A (en) * | 2020-11-06 | 2021-02-23 | 康威通信技术股份有限公司 | Narrow-beam directional antenna and preparation method thereof |
| CN112397886B (en) * | 2020-11-06 | 2022-12-16 | 康威通信技术股份有限公司 | Narrow-beam directional antenna and preparation method thereof |
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