JP2636733B2 - Lightning rod with radio wave absorber - Google Patents
Lightning rod with radio wave absorberInfo
- Publication number
- JP2636733B2 JP2636733B2 JP6113601A JP11360194A JP2636733B2 JP 2636733 B2 JP2636733 B2 JP 2636733B2 JP 6113601 A JP6113601 A JP 6113601A JP 11360194 A JP11360194 A JP 11360194A JP 2636733 B2 JP2636733 B2 JP 2636733B2
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- wave absorber
- antenna
- lightning
- lightning rod
- 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.)
- Expired - Fee Related
Links
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- Details Of Aerials (AREA)
- Elimination Of Static Electricity (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無指向性アンテナへの
落雷防止用の避雷針に関し、特に、アンテナの近傍に設
置してもアンテナの放射パターンに影響を与えることの
ない電波吸収体付き避雷針に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester for preventing a lightning strike on an omnidirectional antenna, and more particularly to a lightning arrester with a radio wave absorber which does not affect the radiation pattern of the antenna even when installed near the antenna. About.
【０００２】[0002]
【従来の技術】一般に、無指向性アンテナ、特に１．５
ＧＨｚ〜２．５ＧＨｚ帯用の比較的高利得の無指向性ア
ンテナは、多数のアンテナ素子を、絶縁体により形成し
た支持パイプを中心として取り付け、それらアンテナ素
子の放射特性を組み合わせることにより無指向性の放射
特性を得ている。このような無指向性アンテナのうち、
屋外に設置される無指向性アンテナについては、従来、
落雷に対するための避雷針が設けられている。このよう
な屋外に設置される高利得の無指向性アンテナにおいて
は、避雷針によるアンテナへの電波干渉等を防止する観
点から、アンテナからの放射電界が無視できる程度小さ
くなるアンテナ頂部に避雷針を設置して避雷する方法が
採られている。このようなアンテナ頂部設置型の避雷針
では、落雷があった場合に、落雷電流を避雷針からアン
テナ内部中心の支持パイプ内に設けた立下げ導線を通し
て地中に導くことにより避雷を行なっている。2. Description of the Related Art Generally, an omnidirectional antenna, especially 1.5
A relatively high-gain omnidirectional antenna for the GHz to 2.5 GHz band is provided by mounting a large number of antenna elements around a support pipe formed of an insulator and combining the radiation characteristics of the antenna elements to obtain a omnidirectional antenna. Radiation characteristics. Among such omnidirectional antennas,
For omni-directional antennas installed outdoors,
Lightning rods are provided for lightning strikes. In such a high-gain omnidirectional antenna installed outdoors, the electric field radiated from the antenna is negligibly small from the viewpoint of preventing radio wave interference to the antenna by a lightning rod.
A lightning rod has been installed at the top of the antenna, which will become lightning storms . In such a lightning rod installed on the top of the antenna, when a lightning strike occurs, lightning is conducted by guiding the lightning current from the lightning rod to the ground through a falling conductor provided in a support pipe in the center of the antenna.
【０００３】しかし、このようなアンテナ頂部設置型の
避雷針では、落雷電流が直接アンテナ内部を流れるた
め、過大な落雷電流があった場合に、立下げ導線と、無
指向性アンテナを構成する多数のアンテナ素子及びこれ
らの素子を接続するケーブルとの間で放電が発生し、ア
ンテナ素子等が破壊されるという問題があった。そこ
で、このようなアンテナ本体の損傷を未然に防止するた
め、避雷針をアンテナと分離してアンテナ近傍に設置す
る方法が採られている。このアンテナと分離して設置す
る避雷針においては、アンテナへの電波干渉等を回避す
るため、避雷針をアンテナと一定距離（例えば１０・
λ）だけ離した状態でアンテナ近傍に並行に設置するこ
とによって、アンテナの放射電界により避雷針上に誘導
される高周波電流の放射電界が、アンテナの放射パター
ンへ与える影響を許容量以下になるようにしている。However, in such a lightning rod installed on the top of the antenna, since the lightning current flows directly inside the antenna, if an excessive lightning current occurs, the falling conductor and a large number of omnidirectional antennas are formed. Discharge occurs between the antenna element and the cable connecting these elements, and there is a problem that the antenna element and the like are destroyed. Therefore, in order to prevent such damage to the antenna main body, a method has been adopted in which the lightning rod is separated from the antenna and installed near the antenna. In the lightning rod installed separately from this antenna, the lightning rod is placed at a certain distance from the antenna (for example, 10.
λ) in parallel and near the antenna so that the radiated electric field of the high-frequency current induced on the lightning rod by the radiated electric field of the antenna does not affect the radiation pattern of the antenna below the allowable amount. ing.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このア
ンテナと分離，並行して設置する避雷針の場合、アンテ
ナの放射パターンに対する避雷針の影響を極力小さくす
るためには、アンテナと避雷針の距離をある程度まで大
きくしなければならず、その一方で、アンテナを避雷針
の保護角（建築基準法，ＪＩＳＡ４２０１等）内に収め
る必要があり、結果として、避雷針をある程度まで長く
するか、あるいは、かなりの高さに設置しなければなら
ないという問題があった。さらに、このアンテナの長大
化や高所設置に伴って、避雷針の支持金具についても、
大型化，大重量化するという問題も発生した。However, in the case of a lightning rod separated and installed in parallel with the antenna, in order to minimize the influence of the lightning rod on the radiation pattern of the antenna, the distance between the antenna and the lightning rod must be increased to some extent. On the other hand, it is necessary to put the antenna within the protection angle of the lightning rod (Building Standards Act, JISA4201, etc.), and as a result, the lightning rod must be lengthened to some extent or installed at a considerable height. There was a problem that had to be done. In addition, with the lengthening of this antenna and installation at high altitudes, the support bracket for the lightning rod
There was also a problem of increasing the size and weight.
【０００５】なお、特開昭６３−２１４００３号の公報
には、アンテナをディスコーンアンテナにより構成し、
アンテナ頂部に避雷針を設置するとともに、該避雷針の
突針からの立下げ導線として同軸ケーブルの外被を使用
した無指向性アンテナ装置が提案されている。しかしな
がら、この特開昭６３−２１４００３号公報に記載のア
ンテナ装置は、アンテナをディスコーンアンテナとした
場合に限り使用できるものであり、１．５ＧＨｚ帯〜
２．５ＧＨｚ帯等に使用される比較的高利得の無指向性
アンテナにおいては、上述したように、立下げ導線をア
ンテナ内部の支持パイプに設けなければならず、アンテ
ナ自体に損傷等が発生してしまうため使用できなかっ
た。Japanese Patent Laid-Open Publication No. Sho 63-214003 discloses that an antenna is constituted by a discone antenna.
An omnidirectional antenna device has been proposed in which a lightning rod is provided at the top of an antenna and a jacket of a coaxial cable is used as a falling conductor from the tip of the lightning rod. However, the antenna device described in JP-A-63-214003 can be used only when the antenna is a discone antenna.
In a relatively high-gain omnidirectional antenna used in the 2.5 GHz band or the like, as described above, the falling conductor must be provided in the support pipe inside the antenna, and the antenna itself may be damaged. Could not be used.
【０００６】本発明は、このような従来の技術が有する
問題を解決するために提案されたものであり、避雷針等
が長大化等することなく、アンテナと分離，隣接して設
置でき、かつ、アンテナの放射パターンへの影響も低減
できる電波吸収体付き避雷針の提供を目的とする。The present invention has been proposed in order to solve such problems of the conventional technology. The lightning rod and the like can be separated from the antenna and installed adjacent to the antenna without increasing the length, etc. It is an object of the present invention to provide a lightning rod with a radio wave absorber that can reduce the influence on the radiation pattern of an antenna.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明の電波吸収体付き避雷針は、無指向性アンテ
ナの近傍に配設されるアンテナへの落雷防止用の避雷針
であって、胴部を電波吸収体で被覆した構成としてあ
り、好ましくは、前記電波吸収体が前記避雷針の胴部
を、少なくとも前記無指向性アンテナと同じ高さ分だけ
被覆した構成としてあり、また前記電波吸収体を、断面
において少なくとも一つの頂点部を有する柱状体とする
とともに、この頂点部を前記無指向性アンテナに向けて
配設した構成としてある。また、必要に応じて、前記電
波吸収体を、前記避雷針の軸方向に少なくとも二以上に
分割し、前記電波吸収体が、前記避雷針に対し回転自在
かつ軸方向へ移動自在に取り付けられた構成としてあ
る。In order to achieve the above object, a lightning arrester with a radio wave absorber according to the present invention is a lightning arrester for preventing lightning from falling on an antenna disposed near an omnidirectional antenna, Part is covered with a radio wave absorber, preferably, the radio wave absorber is configured to cover the body of the lightning rod at least as high as the omnidirectional antenna, and the radio wave absorber Is a columnar body having at least one apex in a cross section, and the apex is arranged toward the omnidirectional antenna. Further, if necessary, the radio wave absorber is divided into at least two or more in the axial direction of the lightning rod, and the radio wave absorber is attached to the lightning rod so as to be rotatable and movable in the axial direction. is there.
【０００８】[0008]
【作用】上記構成からなる本発明の電波吸収体付き避雷
針によれば、避雷針がアンテナ近傍に設置され、かつ、
アンテナの胴部が電波吸収体により被覆されているた
め、アンテナに直接落雷することなく、また、アンテナ
から放射された電波及び避雷針から再放射された電波
が、避雷針の周囲で吸収，減衰され、避雷針によるアン
テナの放射パターンへの影響がなくなる。According to the lightning arrester with the radio wave absorber of the present invention having the above configuration, the lightning arrester is installed near the antenna, and
Since the body of the antenna is covered with a radio wave absorber, lightning does not directly strike the antenna, and radio waves radiated from the antenna and re-radiated from the lightning rod are absorbed and attenuated around the lightning rod, The lightning rod does not affect the radiation pattern of the antenna.
【０００９】[0009]
【実施例】以下、本発明の電波吸収体付き避雷針の実施
例について、図面を参照して説明する。図１は、本発明
の電波吸収体付き避雷針の第一の実施例を示す斜視図で
ある。同図に示すように、本実施例の電波吸収体付き避
雷針は、無指向性アンテナ１の近傍に配設される避雷針
２と、この避雷針の胴部を被覆する電波吸収体３及び避
雷針２に接続されて落雷を地中に導く立下げ導線４とで
構成してある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the lightning rod with a radio wave absorber according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of a lightning rod with a radio wave absorber according to the present invention. As shown in FIG. 1, the lightning arrester with a radio wave absorber of the present embodiment includes a lightning rod 2 disposed near an omnidirectional antenna 1 and a radio wave absorber 3 and a lightning rod 2 covering the body of the lightning rod. A falling conductor 4 is connected to guide lightning strikes into the ground.
【００１０】無指向性アンテナ１と避雷針２は、各々、
支持柱５に設けた支柱板５ａ，５ｂ上に並行かつ隣接し
て支持されている。この、無指向性アンテナ１と避雷針
２は、無指向性アンテナ１が避雷針２の保護角内に収ま
る位置となるように配設されている。避雷針２の支持板
５ｂ側の端部には、落雷接地用の立下げ導線４が接続さ
れている。The omnidirectional antenna 1 and the lightning rod 2 are respectively
The support columns 5 support the support plates 5a and 5b in parallel and adjacently. The omnidirectional antenna 1 and the lightning rod 2 are disposed so that the omnidirectional antenna 1 is located within the protection angle of the lightning rod 2. The lightning rod 2 is connected to an end of the lightning rod 2 on the support plate 5b side.
【００１１】電波吸収体３は、避雷針２の胴部を、少な
くとも無指向性アンテナ１と同じ高さ分だけ被覆する長
さとなっており、本実施例においてはその断面形状が、
一端側が三角形状となった方形状の柱体となっている。
さらに、この電波吸収体３は、避雷針２に対して回転自
在かつ軸方向へ移動自在に取り付けられており、一端側
の三角形状の頂点部分が無指向性アンテナ１側に向けて
配設されている。The radio wave absorber 3 has a length that covers the trunk of the lightning rod 2 at least by the same height as the omnidirectional antenna 1.
One end side is a square pillar having a triangular shape.
Further, the radio wave absorber 3 is attached to the lightning rod 2 so as to be rotatable and movable in the axial direction, and a triangular vertex at one end is disposed toward the omnidirectional antenna 1. I have.
【００１２】このようにするとことによって、無指向性
アンテナ１から放射された電波は、無指向性アンテナ１
を中心とした水平面内の空間を半径方向に伝播していく
ため、この伝播方向に沿って電波吸収体３の大きさが徐
々に大きくなることになる。その結果、電波の進行方向
でのインピーダンスの変化を連続的にするとともに、空
間と電波吸収体３との境界での反射を少なくすることが
でき、無指向性アンテナ１から放射された電波が避雷針
２の近傍で吸収され易くなっている。By doing so, the radio wave radiated from the omnidirectional antenna 1 is
Is propagated in the radial direction in the space in the horizontal plane centered at the center, and the size of the radio wave absorber 3 gradually increases along the propagation direction. As a result, the impedance can be continuously changed in the traveling direction of the radio wave, and the reflection at the boundary between the space and the radio wave absorber 3 can be reduced, so that the radio wave radiated from the non-directional antenna 1 2 is easily absorbed.
【００１３】また、電波吸収体３が避雷針２に対して回
転自在かつ軸方向に移動自在となっているので、電波吸
収体３の向き，位置を容易に調整することができる。本
実施例においては、電波吸収体３の避雷針２への取付け
を、取付ビス３ａを用いて行なっている。これにより、
電波吸収体３が取付ビス３ａを緩めることにより回転自
在，移動自在となるので、電波吸収体３の向き，位置を
容易に調整することができるという効果がある。Since the radio wave absorber 3 is rotatable and axially movable with respect to the lightning rod 2, the direction and position of the radio wave absorber 3 can be easily adjusted. In this embodiment, the electric wave absorber 3 is attached to the lightning rod 2 using the attachment screws 3a. This allows
Since the radio wave absorber 3 becomes rotatable and movable by loosening the mounting screw 3a, there is an effect that the direction and the position of the radio wave absorber 3 can be easily adjusted.
【００１４】なお、電波吸収体３の形状としては、上述
した断面において一端側が三角形状となった方形の柱体
に限らす、断面において少なくとも一つの頂点部を有す
る柱状体であれば、例えば、断面において頂点部を有す
る円柱体，あるいは正三角柱体，二等辺三角柱体等であ
ってもよい。また、この電波吸収体３は、電波吸収性を
高めるため、例えば、ポリエステル系樹脂のような熱硬
化性樹脂に、電波を吸収するカーボニル鉄等の物質を分
散させて硬化することにより形成することが好ましい。The shape of the radio wave absorber 3 is not limited to a rectangular column having one end in a triangular shape in the above-mentioned cross section, and any column having at least one vertex in the cross section may be used. It may be a cylinder having a vertex in the cross section, a regular triangular prism, an isosceles triangular prism, or the like. The radio wave absorber 3 may be formed by, for example, dispersing and curing a substance such as carbonyl iron that absorbs radio waves in a thermosetting resin such as a polyester-based resin in order to enhance radio wave absorption. Is preferred.
【００１５】このような構成からなる本実施例の電波吸
収体付避雷針によれば、落雷があった場合、避雷針２に
直接落雷し、落雷電流が避雷針２及び立下げ導線４を通
って地中に導かれる。すなわち、落雷電流は、アンテナ
１の外部を通って、地中に導かれるため、この電流によ
ってアンテナ１が損傷することはない。なお、一般に電
波吸収体３を構成する材料は、避雷針２を構成する材料
に比べて低導電率であるため、落雷電流の大部分は避雷
針２のみを通って流れ、電波吸収体３の中を通って流れ
る電流はほとんどないため、電波吸収体が落雷電流によ
って焼損することもない。According to the lightning arrester with the radio wave absorber of the present embodiment having such a configuration, when there is a lightning strike, the lightning arrester directly strikes the lightning arrester 2, and the lightning strike current passes through the lightning arrester 2 and the falling conductor 4 and goes underground. It is led to. In other words, the lightning strike current is guided into the ground through the outside of the antenna 1, so that the current does not damage the antenna 1. In general, the material forming the radio wave absorber 3 has a lower conductivity than the material forming the lightning rod 2, so that most of the lightning strike current flows only through the lightning rod 2 and passes through the radio wave absorber 3. Since there is almost no current flowing through, the radio wave absorber is not burned out by the lightning current.
【００１６】一方、無指向性アンテナ１から放射される
電磁波は、高い導電率を持つ避雷針２に到達する以前
に、避雷針２の胴部の電波吸収体３によって吸収，減衰
されてしまう。このため、避雷針２の上に誘導される高
周波電流も小さくなり、この電流によって避雷針２から
再放射される電磁波の振幅も極めて小さくなる。さら
に、避雷針２から再放射される電磁波自身も避雷針２の
周囲の電波吸収体３によって吸収，減衰されるため、電
波吸収体２の外部では、再放射された電磁波の振幅は大
幅に小さくなる。この結果、避雷針２によって再放射さ
れる電磁波によって無指向性アンテナ１の放射パターン
が変化させられることはほとんどなくなる。On the other hand, the electromagnetic wave radiated from the omnidirectional antenna 1 is absorbed and attenuated by the radio wave absorber 3 of the body of the lightning arrester 2 before reaching the lightning arrester 2 having high conductivity. Therefore, the high-frequency current induced on the lightning rod 2 also becomes small, and the amplitude of the electromagnetic wave re-radiated from the lightning rod 2 becomes extremely small. Further, the electromagnetic wave itself re-emitted from the lightning rod 2 is also absorbed and attenuated by the radio wave absorber 3 around the lightning rod 2, so that the amplitude of the re-radiated electromagnetic wave outside the radio wave absorber 2 is significantly reduced. As a result, the radiation pattern of the omnidirectional antenna 1 is hardly changed by the electromagnetic waves re-emitted by the lightning rod 2.
【００１７】次に、本発明の電波吸収体付き避雷針の第
二の実施例について、図２を参照して説明する。図２
は、本発明の電波吸収体付き避雷針の第二の実施例の電
波吸収体を示し、（ａ）は一部拡大斜視図、（ｂ）は避
雷針に取り付けた状態の斜視図である。これらの図に示
すように、本実施例においては、電波吸収体３を分割し
て小型ブロック化し、これを連設することにより、避雷
針２の胴部に取り付けてある。このように構成すること
により、避雷針２の長さが異なった場合でも、電波吸収
体３の連設する個数を増減することにより対応できるの
で、あらゆる長さの避雷針に使用することができる。Next, a second embodiment of a lightning rod with a radio wave absorber according to the present invention will be described with reference to FIG. FIG.
1 shows a radio wave absorber of a second embodiment of a lightning rod with a radio wave absorber according to the present invention, wherein (a) is a partially enlarged perspective view, and (b) is a perspective view showing a state where the lightning rod is attached to the lightning rod. As shown in these figures, in the present embodiment, the radio wave absorber 3 is divided into small blocks, which are connected to each other to be attached to the body of the lightning rod 2. With this configuration, even if the length of the lightning rod 2 is different, it can be dealt with by increasing or decreasing the number of the consecutively arranged radio wave absorbers 3, so that the lightning rod of any length can be used.
【００１８】[0018]
【発明の効果】以上説明したように本発明の電波吸収体
付き避雷針によれば、避雷針等が長大化等することな
く、アンテナと分離，隣接して設置でき、かつ、アンテ
ナの放射パターンへの影響も低減することができる。As described above, according to the lightning arrester with the radio wave absorber of the present invention, the lightning arrester can be installed separately from or adjacent to the antenna without increasing the length, etc. The effect can also be reduced.
【図１】本発明の電波吸収体付き避雷針の第一の実施例
を示す斜視図である。FIG. 1 is a perspective view showing a first embodiment of a lightning arrester with a radio wave absorber according to the present invention.
【図２】本発明の電波吸収体付き避雷針の第二の実施例
の電波吸収体を示し、（ａ）は一部拡大斜視図、（ｂ）
は避雷針に取り付けた状態の斜視図である。FIG. 2 shows a radio wave absorber according to a second embodiment of the lightning rod with the radio wave absorber of the present invention, wherein (a) is a partially enlarged perspective view, and (b).
FIG. 3 is a perspective view of a state where the lightning rod is attached to the lightning rod.
１…無指向性アンテナ ２…避雷針 ３…電波吸収体 ３ａ…取付ビス ４…立下げ導線 ５…支持柱 ５ａ…支持板 ５ｂ…支持板 DESCRIPTION OF SYMBOLS 1 ... Omnidirectional antenna 2 ... Lightning rod 3 ... Radio wave absorber 3a ... Mounting screw 4 ... Falling lead wire 5 ... Support pillar 5a ... Support plate 5b ... Support plate
Claims (5)
ンテナへの落雷防止用の避雷針であって、 避雷針の胴部を電波吸収体により被覆したことを特徴と
する電波吸収体付き避雷針。1. A lightning arrester for preventing lightning from falling on an antenna disposed near an omnidirectional antenna, wherein the body of the lightning arrester is covered with a radio wave absorber.
少なくとも前記無指向性アンテナと同じ高さ分だけ被覆
した請求項１記載の電波吸収体付き避雷針。2. The light-absorbing body includes a body of the lightning rod,
The lightning arrester with a radio wave absorber according to claim 1, wherein the lightning arrester is covered at least as high as the omnidirectional antenna.
とも一つの頂点部を有する柱状体とするとともに、この
頂点部を前記無指向性アンテナに向けて配設した請求項
１又は２記載の電波吸収体付き避雷針。3. The radio wave absorber according to claim 1, wherein the radio wave absorber is a columnar body having at least one vertex in a cross section, and the vertex is disposed toward the omnidirectional antenna. Lightning rod with body.
に少なくとも二以上に分割した請求項１又は２記載の電
波吸収体付き避雷針。4. The lightning rod with a radio wave absorber according to claim 1, wherein the radio wave absorber is divided into at least two or more in the axial direction of the lightning rod.
転自在かつ軸方向へ移動自在に取り付けられた請求項
１，２，３又は４記載の電波吸収体付き避雷針。5. A lightning arrester with a radio wave absorber according to claim 1, wherein said radio wave absorber is rotatably mounted on said lightning rod so as to be movable in an axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6113601A JP2636733B2 (en) | 1994-04-28 | 1994-04-28 | Lightning rod with radio wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6113601A JP2636733B2 (en) | 1994-04-28 | 1994-04-28 | Lightning rod with radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07303325A JPH07303325A (en) | 1995-11-14 |
| JP2636733B2 true JP2636733B2 (en) | 1997-07-30 |
Family
ID=14616354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6113601A Expired - Fee Related JP2636733B2 (en) | 1994-04-28 | 1994-04-28 | Lightning rod with radio wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2636733B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010053639B4 (en) | 2010-12-07 | 2017-05-18 | Rohde & Schwarz Gmbh & Co. Kg | Lightning rod for antenna systems |
| CN113049903B (en) * | 2021-03-26 | 2022-09-20 | 安徽得倍安检测技术有限公司 | Experimental device and method for testing lightning rod protection angle |
-
1994
- 1994-04-28 JP JP6113601A patent/JP2636733B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07303325A (en) | 1995-11-14 |
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