JP2003264425A - Television wave transmission steel tower with radio wave absorption plate - Google Patents

Television wave transmission steel tower with radio wave absorption plate

Info

Publication number
JP2003264425A
JP2003264425A JP2003024410A JP2003024410A JP2003264425A JP 2003264425 A JP2003264425 A JP 2003264425A JP 2003024410 A JP2003024410 A JP 2003024410A JP 2003024410 A JP2003024410 A JP 2003024410A JP 2003264425 A JP2003264425 A JP 2003264425A
Authority
JP
Japan
Prior art keywords
radio wave
television
absorption plate
plate
radio
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
Application number
JP2003024410A
Other languages
Japanese (ja)
Inventor
Masahiro Abe
昌弘 阿部
Masao Honda
正雄 本田
Kiyoshi Nakagawa
清 中川
Hiroshi Iida
博志 飯田
Yoshio Tsuchisaki
良雄 土崎
Ichiro Kuwayama
一郎 桑山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Yomiuri Telecasting Corp
Original Assignee
Sumitomo Electric Industries Ltd
Yomiuri Telecasting Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd, Yomiuri Telecasting Corp filed Critical Sumitomo Electric Industries Ltd
Priority to JP2003024410A priority Critical patent/JP2003264425A/en
Publication of JP2003264425A publication Critical patent/JP2003264425A/en
Pending legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To realize a television wave transmission steel tower with radio wave absorption plate, capable of efficiently absorbing radio waves by mounting the radio wave absorption plate. <P>SOLUTION: The radio wave absorption plate 1 having structure by laminating a radio wave absorbing body on a metal reflector plate and further laminating a plastic plate on the radio wave absorbing body is mounted on the television wave transmission steel tower 21. Consequently, unnespurious radiation can be relieved by increasing the reflection loss of the radio waves that are radiated from antennas of other steel towers even under conditions that many steel towers for transmission are installed in a narrow area and the radio wave absorption plate 1 is made useful for countermeasures against the ghost in television broadcast. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、テレビジョン放送
のゴースト障害対策に用いられる電波吸収板付テレビジ
ョン電波送信鉄塔に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television radio wave transmission tower with a radio wave absorber used to prevent ghost interference in television broadcasting.

【0002】[0002]

【従来の技術】山頂などの標高の高い場所に、テレビジ
ョン電波送信鉄塔が、放送周波数(チャンネル)別に、
複数基設置されている。これらの送信鉄塔は、互いに近
接して設置されているので、1つの送信鉄塔の送信アン
テナから放射された電波が他の送信鉄塔の一部に当たっ
て反射することがある。そのうち水平よりも下向きの反
射波が一般受信世帯にゴースト障害を起こすことが知ら
れている。
2. Description of the Related Art Television radio transmission towers are installed at high altitudes such as at the top of mountains by broadcasting frequency (channel).
Multiple units are installed. Since these transmission towers are installed close to each other, a radio wave radiated from the transmission antenna of one transmission tower may hit a part of another transmission tower and be reflected. It is known that the reflected wave downward from the horizontal causes ghost damage to general receiving households.

【0003】そこで、反射波を軽減するために、鉄塔を
新設するときに、反射方向が受信世帯の少ない地域を向
くように新設鉄塔の横断面形状を工夫したり、反射方向
が水平よりも上向きになるように、新設鉄塔の縦断面形
状を工夫したりしている。
[0003] Therefore, in order to reduce the reflected waves, when constructing a new steel tower, the cross-sectional shape of the new steel tower should be devised so that the direction of reflection should be directed to an area with few receiving households, or the direction of reflection should be higher than horizontal. I am devising the vertical cross-sectional shape of the new steel tower so that

【0004】[0004]

【発明が解決しようとする課題】しかし、狭い地域に送
信鉄塔が数多く設置されていると、前記のような電波を
反射させる工夫をしても限度がある。そこで、電波の反
射を考えるだけでなく、鉄塔の反射の基となる部分に、
電波の吸収をする電波吸収体を配置する、という措置も
必要になってくる。本発明は、電波吸収板を取り付ける
ことにより、効率的に電波を吸収することのできる電波
吸収板付テレビジョン電波送信鉄塔を実現することを目
的とする。
However, if many transmission towers are installed in a small area, there is a limit even if the above-described device for reflecting radio waves is used. Therefore, not only considering the reflection of radio waves,
It is also necessary to take measures to arrange a radio wave absorber that absorbs radio waves. It is an object of the present invention to realize a television radio wave transmission tower with a radio wave absorber that can efficiently absorb radio waves by attaching a radio wave absorber.

【0005】[0005]

【課題を解決するための手段】本発明の電波吸収板付テ
レビジョン電波送信鉄塔は、電波吸収体材料からなるタ
イルを複数枚、金属反射板の上に並べ、さらにその上に
プラスチック板を積層し、周囲をプラスチック枠で取り
囲んだ構造を有する電波吸収板を取り付けていることを
特徴とする。前記の構成によれば、電波吸収板に入射す
る電波は電波吸収体で一部吸収され、金属反射板に反射
され、再度電波吸収体で吸収されるので、反射損失を大
きくすることができる。
In a television radio wave transmission tower with a radio wave absorber according to the present invention, a plurality of tiles made of a radio wave absorber material are arranged on a metal reflector, and a plastic plate is further laminated thereon. It is characterized in that a radio wave absorber having a structure in which the periphery is surrounded by a plastic frame is attached. According to the above configuration, the radio wave incident on the radio wave absorber is partially absorbed by the radio wave absorber, reflected by the metal reflector, and again absorbed by the radio wave absorber, so that the reflection loss can be increased.

【0006】したがって、このような電波吸収板をテレ
ビジョン電波送信鉄塔に取り付けることにより、狭い地
域に送信鉄塔が数多く設置されている条件下において
も、電波の反射損失を増やすことができる。
Therefore, by mounting such a radio wave absorber on a television radio wave transmission tower, the reflection loss of radio waves can be increased even under the condition that many transmission towers are installed in a small area.

【0007】[0007]

【発明の実施の形態】以下、本発明の実施の形態を、添
付図面を参照しながら詳細に説明する。図1は、電波吸
収板1の斜視図である。電波吸収板1は、ステンレス鋼
板2の上に複数(図では42個)のフェライトタイル7
を横に密に並べ、その上面に繊維強化プラスチック板3
を載せ、周囲を繊維強化プラスチック板3aで取り囲ん
だ構造を有している。ステンレス鋼板2の裏面には、電
波吸収板1を鉄塔に固定するための取付け部材4が配置
されている。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view of the radio wave absorption plate 1. The electromagnetic wave absorption plate 1 includes a plurality of (42 in the figure) ferrite tiles 7 on the stainless steel plate 2.
Side by side densely, and the fiber reinforced plastic plate 3 on the upper surface
And has a structure in which the periphery is surrounded by the fiber reinforced plastic plate 3a. On the back surface of the stainless steel plate 2, a mounting member 4 for fixing the radio wave absorption plate 1 to the steel tower is arranged.

【0008】図2は、電波吸収板1の断面図であり、前
記取付け部材4、ステンレス鋼板2、フェライトタイル
7、繊維強化プラスチック板3aは、ボルト5で貫通固
定され、周囲の取付け部材4とステンレス鋼板2と繊維
強化プラスチック板3aとは、ボルト6で貫通固定され
ている。このフェライトタイル7は、Fe23を主成分
としVHF帯又はUHF帯の電波吸収体として製造され
ているものである(住友特殊金属株式会社製登録商標CE
RAXCUBE)。
FIG. 2 is a cross-sectional view of the radio wave absorption plate 1, in which the mounting member 4, the stainless steel plate 2, the ferrite tile 7 and the fiber reinforced plastic plate 3a are fixed by penetrating them with bolts 5 and the surrounding mounting member 4. The stainless steel plate 2 and the fiber-reinforced plastic plate 3a are fixed by penetrating with a bolt 6. The ferrite tile 7 is mainly composed of Fe 2 O 3 and manufactured as a VHF band or UHF band electromagnetic wave absorber (registered trademark CE manufactured by Sumitomo Special Metals Co., Ltd.
RAXCUBE).

【0009】繊維強化プラスチック板3,3aはガラス
基材中に樹脂を含浸させ硬化させたものである。このよ
うな構造によって、複数のフェライトタイル7をステン
レス鋼板2の上に平らに並べることができるとともに、
複数のフェライトタイル7をしっかりと固定することが
できる。また、フェライトタイル7の上面及び周囲を繊
維強化プラスチック板3,3aで取り囲んでいるので、
電波吸収板1の重量を軽くすることができる。
The fiber reinforced plastic plates 3 and 3a are obtained by impregnating a glass base material with a resin and curing it. With such a structure, a plurality of ferrite tiles 7 can be arranged flat on the stainless steel plate 2, and
It is possible to firmly fix the plurality of ferrite tiles 7. Further, since the upper surface and the periphery of the ferrite tile 7 are surrounded by the fiber reinforced plastic plates 3 and 3a,
The weight of the radio wave absorber 1 can be reduced.

【0010】そして、電波吸収板1に入射する電波は、
フェライトタイル7によって吸収され、ステンレス鋼板
2により反射され、フェライトタイル7によって再度吸
収される。したがって、電波を効率よく吸収することが
できる。なお、ステンレス鋼板2以外に、鉄、アルミニ
ウムなどの金属板を用いてもよく、繊維強化プラスチッ
ク板3以外に、繊維強化しないプラスチック板を用いて
もよい。
Then, the electric wave entering the electric wave absorbing plate 1 is
It is absorbed by the ferrite tile 7, reflected by the stainless steel plate 2, and again absorbed by the ferrite tile 7. Therefore, radio waves can be efficiently absorbed. In addition to the stainless steel plate 2, a metal plate such as iron or aluminum may be used, and in addition to the fiber-reinforced plastic plate 3, a non-fiber-reinforced plastic plate may be used.

【0011】以上の電波吸収板1を複数枚(図では13
枚)集めて、大きな電波吸収板10を作り、既設の鉄塔
12に取り付けた状態を図3に示す。図3(a)は正面
図、図3(b)は矢印Aから見た平面図、図3(c)は側面図
である。13はプラットフォーム、14は既設のアンテ
ナを示す。大きな電波吸収板10の取付け位置は、プラ
ットフォーム13と既設のアンテナ14との間の、鉄骨
がむき出しになっている部分である。大きな電波吸収板
10は、この部分に、やや上方を向いて取り付けられて
いる。
A plurality of the above wave absorbing plates 1 (13 in the figure)
FIG. 3 shows a state in which a large electromagnetic wave absorbing plate 10 is assembled and attached to an existing steel tower 12 by collecting the same. 3A is a front view, FIG. 3B is a plan view seen from an arrow A, and FIG. 3C is a side view. 13 is a platform, and 14 is an existing antenna. The mounting position of the large radio wave absorption plate 10 is a portion where the steel frame is exposed between the platform 13 and the existing antenna 14. The large radio wave absorption plate 10 is attached to this portion so as to face slightly upward.

【0012】なお図3(c)によれば、大きな電波吸収板
10が既設の鉄塔12から浮いているように見えるが、
取付け金具の図示を省略しているだけであって、実際に
は、大きな電波吸収板10は、相当な強度で既設の鉄塔
12に取り付けられている。
According to FIG. 3 (c), the large electromagnetic wave absorbing plate 10 seems to float from the existing steel tower 12,
Although the illustration of the mounting metal fittings is omitted, the large electromagnetic wave absorption plate 10 is actually mounted on the existing steel tower 12 with considerable strength.

【0013】[0013]

【実施例】図4に示すように、 金属反射板2に、フェ
ライトタイル7(厚さ6mm)を上下2段に並べ、それ
ぞれの上に繊維強化プラスチック板3(厚さ2mm及び
3mm)を積層して、正面から直線偏波の電波(電界方
向E、磁界方向H)を垂直に当て、電波反射損失を計算
した。なお、各段のフェライトタイル7の縦横寸法は、
波長よりも大きなサイズとなるようにし、フェライトタ
イル7の上下段の境界には、図示の磁界方向Hに隙間L
を設けた。Lの寸法は、50mmとした。
EXAMPLE As shown in FIG. 4, ferrite tiles 7 (thickness: 6 mm) are arranged in two layers vertically on a metal reflection plate 2, and fiber reinforced plastic plates 3 (thicknesses: 2 mm and 3 mm) are laminated on each. Then, a linearly polarized radio wave (electric field direction E, magnetic field direction H) was vertically applied from the front, and the radio wave reflection loss was calculated. In addition, the vertical and horizontal dimensions of the ferrite tile 7 in each stage are
The size is larger than the wavelength, and a gap L is formed in the magnetic field direction H at the upper and lower boundaries of the ferrite tile 7.
Was set up. The dimension of L was 50 mm.

【0014】電波反射損失を、周波数を変えながら計算
したところ、図5に示すようなグラフが得られた。実線
は繊維強化プラスチック板3の厚さが2mmの場合、破
線は繊維強化プラスチック板3の厚さが3mmの場合を
表す。電波反射損失は、100MHz(VHF帯の2チ
ャンネル付近)で約13dB、200MHz(VHF帯
の9チャンネル付近)で約20dBとなり、十分な減衰
が得られることが分かる。
When the radio wave reflection loss was calculated while changing the frequency, a graph as shown in FIG. 5 was obtained. The solid line represents the case where the thickness of the fiber reinforced plastic plate 3 is 2 mm, and the broken line represents the case where the thickness of the fiber reinforced plastic plate 3 is 3 mm. The radio wave reflection loss is about 13 dB at 100 MHz (near 2 channels in the VHF band) and about 20 dB at 200 MHz (near 9 channels in the VHF band), which indicates that sufficient attenuation can be obtained.

【0015】[0015]

【発明の効果】以上のように本発明の電波吸収板付テレ
ビジョン電波送信鉄塔によれば、狭い地域に送信鉄塔が
数多く設置されている条件下においても、他の鉄塔のア
ンテナから放射される電波の反射損失を増やして、不要
放射を軽減することができ、テレビション放送のゴース
ト対策に役立てることができる。
As described above, according to the television radio wave transmission tower with the radio wave absorber of the present invention, even under the condition that many transmission towers are installed in a small area, the radio waves radiated from the antennas of other towers It is possible to increase the reflection loss and reduce unnecessary radiation, which can be useful as a ghost countermeasure for television broadcasting.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施形態に係る電波吸収板の斜視図で
ある。
FIG. 1 is a perspective view of a radio wave absorber according to an embodiment of the present invention.

【図2】本発明の実施形態に係る電波吸収板の断面図で
ある。
FIG. 2 is a cross-sectional view of a radio wave absorber according to an embodiment of the present invention.

【図3】電波吸収板1を複数枚、既設の鉄塔に取り付け
た状態を示す図であり、(a)は正面図、(b)は矢印Aから
見た平面図、(c)は側面図である。
FIG. 3 is a diagram showing a state in which a plurality of radio wave absorption plates 1 are attached to an existing steel tower, (a) is a front view, (b) is a plan view seen from arrow A, and (c) is a side view. Is.

【図4】電波反射損失を計算するために想定した、電波
吸収板の配置図である。
FIG. 4 is a layout plan of a radio wave absorber assumed to calculate a radio wave reflection loss.

【図5】電波反射損失の計算結果を示すグラフである。FIG. 5 is a graph showing calculation results of radio wave reflection loss.

【符号の説明】[Explanation of symbols]

1,10 電波吸収板 2 ステンレス鋼板 3,3a 繊維強化プラスチック板 4 取付け部材 7 フェライトタイル 12 既設の鉄塔 1,10 Radio wave absorption plate 2 Stainless steel plate 3,3a Fiber reinforced plastic plate 4 Mounting member 7 Ferrite tile 12 Existing steel tower

───────────────────────────────────────────────────── フロントページの続き (72)発明者 本田 正雄 大阪府大阪市中央区城見2丁目2番33号 讀賣テレビ放送株式会社内 (72)発明者 中川 清 大阪府大阪市中央区城見2丁目2番33号 讀賣テレビ放送株式会社内 (72)発明者 飯田 博志 大阪市此花区島屋一丁目1番3号 住友電 気工業株式会社大阪製作所内 (72)発明者 土崎 良雄 大阪市此花区島屋一丁目1番3号 住友電 気工業株式会社大阪製作所内 (72)発明者 桑山 一郎 大阪市此花区島屋一丁目1番3号 住友電 気工業株式会社大阪製作所内 Fターム(参考) 5E321 BB21 BB51 CC22 GG11 5J020 EA02 EA07 EA09    ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masao Honda             2-32 Jomi, Chuo-ku, Osaka City, Osaka Prefecture             Yoryu Television Broadcasting Co., Ltd. (72) Inventor Kiyoshi Nakagawa             2-32 Jomi, Chuo-ku, Osaka City, Osaka Prefecture             Yoryu Television Broadcasting Co., Ltd. (72) Inventor Hiroshi Iida             1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric             Ki Industry Co., Ltd. Osaka Works (72) Inventor Yoshio Tsuchizaki             1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric             Ki Industry Co., Ltd. Osaka Works (72) Inventor Ichiro Kuwayama             1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric             Ki Industry Co., Ltd. Osaka Works F-term (reference) 5E321 BB21 BB51 CC22 GG11                 5J020 EA02 EA07 EA09

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】電波吸収体材料からなるタイルを複数枚、
金属反射板の上に並べ、さらにその上にプラスチック板
を積層し、周囲をプラスチック枠で取り囲んだ構造を有
する電波吸収板を取り付けていることを特徴とする電波
吸収板付テレビジョン電波送信鉄塔。
1. A plurality of tiles made of a radio wave absorber material,
A television radio transmission tower with a radio wave absorber, characterized in that a radio wave absorber having a structure in which a plastic plate is laminated on top of a metal reflector and the periphery is surrounded by a plastic frame is attached.
【請求項2】前記電波吸収板の各タイルの縦横寸法は、
吸収しようとする電波の波長よりも大きなサイズに選ば
れていることを特徴とする請求項1記載の電波吸収板付
テレビジョン電波送信鉄塔。
2. The vertical and horizontal dimensions of each tile of the radio wave absorber are:
The television radio wave transmission tower with a radio wave absorption plate according to claim 1, wherein the size is selected to be larger than the wavelength of the radio wave to be absorbed.
【請求項3】プラスチック枠を繊維強化プラスチックで
形成したことを特徴とする請求項1又は請求項2記載の
電波吸収板付テレビジョン電波送信鉄塔。
3. The television radio wave transmission tower with a radio wave absorber according to claim 1 or 2, wherein the plastic frame is made of fiber reinforced plastic.
JP2003024410A 2003-01-31 2003-01-31 Television wave transmission steel tower with radio wave absorption plate Pending JP2003264425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003024410A JP2003264425A (en) 2003-01-31 2003-01-31 Television wave transmission steel tower with radio wave absorption plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003024410A JP2003264425A (en) 2003-01-31 2003-01-31 Television wave transmission steel tower with radio wave absorption plate

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP26418399A Division JP2001094343A (en) 1999-09-17 1999-09-17 Steel tower with radio wave absorbing board

Publications (1)

Publication Number Publication Date
JP2003264425A true JP2003264425A (en) 2003-09-19

Family

ID=29208398

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003024410A Pending JP2003264425A (en) 2003-01-31 2003-01-31 Television wave transmission steel tower with radio wave absorption plate

Country Status (1)

Country Link
JP (1) JP2003264425A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110020110A1 (en) * 2008-10-06 2011-01-27 Flodesign Wind Turbine Corporation Wind turbine with reduced radar signature
GB2480064A (en) * 2010-05-04 2011-11-09 Vestas Wind Sys As RAM panel arrangements for a wind turbine tower

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110020110A1 (en) * 2008-10-06 2011-01-27 Flodesign Wind Turbine Corporation Wind turbine with reduced radar signature
GB2480064A (en) * 2010-05-04 2011-11-09 Vestas Wind Sys As RAM panel arrangements for a wind turbine tower

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