JP2582632B2 - Radio wave absorption wall - Google Patents
Radio wave absorption wallInfo
- Publication number
- JP2582632B2 JP2582632B2 JP63323765A JP32376588A JP2582632B2 JP 2582632 B2 JP2582632 B2 JP 2582632B2 JP 63323765 A JP63323765 A JP 63323765A JP 32376588 A JP32376588 A JP 32376588A JP 2582632 B2 JP2582632 B2 JP 2582632B2
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- magnetic
- wall
- gap
- wave absorbing
- 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 - Lifetime
Links
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、電波吸収壁に関し特に高層建築物の外壁に
用いられ、VHF,UHFの不要反射電波障害を防止する電波
吸収壁に関する。Description: TECHNICAL FIELD The present invention relates to a radio wave absorbing wall, and more particularly, to a radio wave absorbing wall used for an outer wall of a high-rise building and for preventing unnecessary reflected radio wave interference of VHF and UHF.
（従来の技術） 現在、建物や鉄塔等が電波反射体となり、電波を利用
する面での信頼性を高める上で問題化されている。特
に、高層建築物による不要反射電波がテレビ放送電波を
乱し、画面にゴースト障害を生じさせる等、電波公害が
クローズアップされてきている。この対策として、特公
昭55−13600号公報および特公昭55−49798公報に開示さ
れた電波吸収壁が提案されており、電波吸収特性を有す
るフェライト等の磁性体を例えば鉄筋，金属，金属板等
の電波反射骨材を埋設させたコンクリート，モルタル等
の建築材の表面又は内部に配置し、電波吸収特性をもた
せたカーテンウォール（PC板）が考えられている。この
電波吸収壁によって高層建築物による不要反射電波障害
防止において大きな効果が得られている。これら電波吸
収壁は、従来の技術範囲においては電波吸収特性を低下
させないために、少なくとも複数個の磁性体、例えば10
0mm×100mm程度のタイル状フェライトを、到来電波の磁
界成分の方向には互いに密接し固着させる必要があっ
た。具体的には、第３図〜第６図に示す配列が提案され
ている。各図のイは正面から見た斜視図、ロは断面図で
ある。(Prior Art) At present, a building, a steel tower, or the like serves as a radio wave reflector, and has been problematic in improving reliability in terms of using radio waves. In particular, radio wave pollution has been gaining attention, such as unnecessary reflected radio waves from high-rise buildings disturbing television broadcast radio waves and causing ghosting failures on the screen. As a countermeasure, a radio wave absorbing wall disclosed in Japanese Patent Publication No. 55-13600 and Japanese Patent Publication No. 55-49798 has been proposed. There has been considered a curtain wall (PC board) having radio wave absorption characteristics, which is arranged on the surface or inside of a building material such as concrete or mortar in which the radio wave reflecting aggregate is embedded. This radio wave absorbing wall has a great effect in preventing unnecessary reflected radio wave interference by high-rise buildings. These radio wave absorbing walls have at least a plurality of magnetic materials, for example, 10
Tile ferrites of about 0 mm x 100 mm had to be closely adhered and fixed in the direction of the magnetic field component of the arriving radio wave. Specifically, the arrangements shown in FIGS. 3 to 6 have been proposed. A in each figure is a perspective view as viewed from the front, and B is a cross-sectional view.
第３図は、金属板等の反射体32に複数個のフェライト
板31を直接に固着させた電波吸収壁を示し、第４図は、
鉄筋，金網，金属板等の金属骨材（反射体）42にコンク
リート、又はモルタル43等の補強材を打込んだ建築部材
の表面に複数個のフェライト板41を埋込み、貫通孔44に
ナイロン線，鉄線等の芯線45を挿通させ、この芯線45を
骨材その他の基部に固定し得るようにし、剥離に対する
安全性を高めた電波吸収壁を示し、第５図は、複数個の
フェライト板51を金網等の反射板52を含むコンクリー
ト，モルタル53に埋設させた電波吸収壁を示し、第６図
は磁器タイル，岩石等の外装材66,フェライト板61,電波
反射体62を含むコンクリート板67を埋設させて組合わせ
た電波吸収壁を示している。いずれも磁界成分の方向に
は連続して密着させる構造をとる。これらの電波吸収壁
によって高層建築物による不要反射電波障害防止におい
て大きな効果が得られる。FIG. 3 shows a radio wave absorbing wall in which a plurality of ferrite plates 31 are directly fixed to a reflector 32 such as a metal plate, and FIG.
A plurality of ferrite plates 41 are embedded in the surface of a building member in which a reinforcing material such as concrete or mortar 43 is driven into a metal aggregate (reflector) 42 such as a reinforcing bar, a wire mesh, or a metal plate. 5 shows a radio wave absorbing wall through which a core wire 45 such as an iron wire is inserted so that the core wire 45 can be fixed to an aggregate or other base to enhance the safety against peeling. FIG. 6 shows a radio wave absorbing wall buried in concrete and mortar 53 including a reflecting plate 52 such as a wire mesh. FIG. 6 shows a concrete plate 67 including a porcelain tile, a cladding 66 such as rock, a ferrite plate 61 and a radio wave reflector 62. Shows a radio wave absorbing wall in which is embedded and combined. Each of them has a structure in which the magnetic field components are continuously adhered in the direction of the magnetic field component. With these radio wave absorbing walls, a great effect can be obtained in preventing unnecessary reflected radio wave interference by high-rise buildings.
（発明が解決しようとする課題） しかしながら、上記PCパネルとして特に最近の大型化
した高層建築物においては、フェライト板の前に配置さ
れる外装材を美観上から岩石や磁器タイルで構成するこ
とが要求され、その場合十分な強度を保持する必要があ
り、そのためには外装材をある程度厚くする必要があ
る。尚、フェライト板の前に外装材を装着することによ
り、電波吸収特性は大きく変化し劣化する。例えばWX−
20D（内径8.6mm 外径19.8mm）同軸管による測定でコン
クリート・フェライト・外装材の３層構造を積層して形
成した試料を用い、外装材の厚さを０〜25mm迄変化させ
た場合の評価を行った結果、第７図のような特性が得ら
れ、電波吸収特性の共振点が低周波に移動する。さらに
例えば20dB以上の反射減衰量の周波数範囲巾は、約700M
Hz強から100MHz程度に大巾に劣化する。(Problems to be Solved by the Invention) However, particularly in recent large-sized high-rise buildings as the PC panel, the exterior material disposed in front of the ferrite plate may be composed of rock or porcelain tile from an aesthetic point of view. In such a case, it is necessary to maintain sufficient strength, and for that purpose, it is necessary to increase the thickness of the exterior material to some extent. In addition, when an exterior material is attached in front of the ferrite plate, the radio wave absorption characteristics greatly change and deteriorate. For example, WX-
Using a sample formed by laminating a three-layer structure of concrete, ferrite, and exterior materials by measuring with a 20D (8.6 mm inner diameter, 19.8 mm outer diameter) coaxial tube, when the thickness of the exterior material is varied from 0 to 25 mm As a result of the evaluation, the characteristic shown in FIG. 7 is obtained, and the resonance point of the radio wave absorption characteristic moves to a low frequency. Further, for example, the frequency range width of the return loss of 20 dB or more is about 700 M
It deteriorates greatly from a little over Hz to about 100MHz.
尚、D1はコンクリートの厚さを表わし、D2はフェライ
トの厚さを表わし、D3は外装材の厚さを表わす。D1 represents the thickness of the concrete, D2 represents the thickness of the ferrite, and D3 represents the thickness of the exterior material.
本発明は、これらの問題を解決するためのもので、例
えば外装材の厚さが厚い場合の特性劣化を回復させ電波
吸収特性を必要とされる周波数範囲に制御することがで
き、優れた電波吸収壁を提供することを目的とする。The present invention is intended to solve these problems. For example, it is possible to recover the characteristic deterioration when the thickness of the exterior material is large and to control the radio wave absorption characteristics to a required frequency range, thereby providing an excellent radio wave. It is intended to provide an absorbing wall.
（課題を解決するための手段） 本発明は、前記問題点を解決するために、磁界成分の
方向に複数個のフェライト板等の磁性体が連続して配列
している部分に互いのフェライト板を密着させず、磁性
体の磁界成分方向の長さの0.2〜5.0％の比となる隙間
（スリット）を設けることにより磁気特性を制御するこ
とができ、鉄筋，金網，金属板等の電波反射体を埋設さ
せてコンクリート，モルタル等建物の外壁となる建築材
料に電波吸収特性を有するフェライト板等の磁性体板も
埋設させ、かつ前記磁性体板の表面に外装材を施した電
波吸収壁において、必要とされる周波数範囲において電
波吸収特性が十分得られるように工夫したことである。
従って、本発明は第８図（イ）に示すような磁界成分の
方向に配列された複数個のフェライト板等の磁性体81間
に上記の隙間（スリット）87を設けたことに特徴があ
る。また、複数個の磁性体が一部密着させて配列され、
上記の隙間（スリット）は部分的に設けられてもよい。
さらに、第８図（ロ）に示すような複数個のフェライト
板等の磁性体82間に設ける上記の隙間（スリット）87に
塩ビ等のプラスチックや建築材料として有効なセラミッ
クス等の薄板88をはさみ、隙間の寸法精度を上げること
にも特徴がある。(Means for Solving the Problems) In order to solve the above problems, the present invention provides a method in which a plurality of ferrite plates or the like are arranged in a portion where magnetic materials such as a plurality of ferrite plates are continuously arranged in the direction of a magnetic field component. The magnetic properties can be controlled by providing a gap (slit) with a ratio of 0.2 to 5.0% of the length of the magnetic material in the direction of the magnetic field component without closely contacting the magnetic material. A magnetic material such as a ferrite plate having radio wave absorption characteristics is also buried in a building material, such as concrete or mortar, which is an outer wall of a building by burying a body, and a radio wave absorbing wall having a surface material provided with an exterior material on the surface of the magnetic plate. In addition, the present invention has been devised so that radio wave absorption characteristics can be sufficiently obtained in a required frequency range.
Therefore, the present invention is characterized in that the above-mentioned gap (slit) 87 is provided between a plurality of magnetic bodies 81 such as ferrite plates arranged in the direction of the magnetic field component as shown in FIG. . In addition, a plurality of magnetic bodies are arranged in close contact with each other,
The gap (slit) may be partially provided.
Further, a thin plate 88 made of plastic such as PVC or ceramics effective as a building material is sandwiched between the above-mentioned gaps (slits) 87 provided between a plurality of magnetic bodies 82 such as ferrite plates as shown in FIG. Another feature is that the dimensional accuracy of the gap is increased.
（作 用） 以上のような構成を有する本発明によれば、到来電波
の磁界成分の方向に配列された複数個のフェライト板等
の磁性体間に磁性体の磁界成分方向の長さの0.2〜5.0％
の比となる隙間（スリット）を設けることにより、例え
ば第９図に示すように周波数に対する磁気特性が変化す
る作用をとらえ、電波吸収特性の周波数依存性を制御で
きる。第９図はフェライトの磁気特性である複素透磁率
（μｒ＝μ′ｒ−ｊμ″ｒ）のWX−20D同軸による測定
値であり、隙間を0,1,2mm設けた時の変化を示してい
る。したがって、本発明は、前記外装材が厚くなったと
きに電波吸収特性が低周波側に移動し必要周波数で十分
な特性が得られない問題点を複数個のフェライト板等の
磁性体間に磁性体の磁界成分方向の長さの0.2〜5.0％の
比となる隙間（スリット）をあけることにより、磁気特
性を制御することにより解決でき、優れた電波吸収特性
を有する電波吸収壁を提供できる。(Operation) According to the present invention having the above-described configuration, the length of the magnetic material component direction in the direction of the magnetic field component between the magnetic materials such as a plurality of ferrite plates arranged in the direction of the magnetic field component of the incoming radio wave is 0.2 mm. ~ 5.0%
By providing a gap (slit) having a ratio of, for example, as shown in FIG. 9, the effect of changing the magnetic characteristic with respect to frequency can be captured, and the frequency dependence of the radio wave absorption characteristic can be controlled. FIG. 9 shows the measured values of the complex magnetic permeability (μ r = μ ′ r −jμ ″ r ), which is the magnetic property of ferrite, using a WX-20D coaxial, and shows the change when a gap of 0, 1, 2 mm is provided. Therefore, the present invention has a problem that the radio wave absorption characteristics move to a lower frequency side when the outer packaging material becomes thick, and sufficient characteristics cannot be obtained at a required frequency. By providing a gap (slit) with a ratio of 0.2 to 5.0% of the length of the magnetic material in the direction of the magnetic field component between them, it is possible to solve the problem by controlling the magnetic properties, and create a radio wave absorption wall with excellent radio wave absorption properties Can be provided.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。第
１図は本発明の一実施例の電波吸収壁を示す構造図であ
る。（イ）は正面から見た斜視図、（ロ）は断面図であ
る。鉄筋12を埋設させたコンクリート13にフェライト板
11,100mm×100mm×10mmを隙間なし、0.2mm,0.5mm,1.0m
m,2.0mm,5.0mm,6.0mmの磁気的な隙間を設けて配列し各
々埋設させ、該フェライト板の間には非磁性体として塩
ビ板18（塩化ビニル）をはさんでわずかな磁気的な隙間
（スリット）を形成させており、かつ前記フェライト板
の前面に岩石板16（誘電率ε′＝６）厚さ22mmを配設し
た電波吸収壁７種類を製作した。これらの電波吸収壁の
電波吸収特性を測定した結果、第２図が得られ、従来の
電波吸収壁スリットなしの場合、約150MHz以上の周波数
で著しく特性が悪くなっているが、スリット1mmでTV周
波数のVHF帯で14dB以上の反射減衰量が得られている。D
1はフェライト裏面と反射体前面の間のコンクリート層
の厚さを表し、D2はフェライト厚さを表し、D3は外装材
の厚さを表わす。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a structural view showing a radio wave absorbing wall according to one embodiment of the present invention. (A) is a perspective view as viewed from the front, and (B) is a cross-sectional view. Ferrite plate on concrete 13 with reinforcing bars 12 embedded
No gap between 11,100mm × 100mm × 10mm, 0.2mm, 0.5mm, 1.0m
m, 2.0mm, 5.0mm, 6.0mm magnetic gaps are arranged and buried, and a small magnetic gap is sandwiched between the ferrite plates by sandwiching a PVC plate 18 (vinyl chloride) as a non-magnetic material. (Slits) were formed, and seven types of radio wave absorbing walls were manufactured in which a rock plate 16 (dielectric constant ε '= 6) having a thickness of 22 mm was provided in front of the ferrite plate. As a result of measuring the radio wave absorption characteristics of these radio wave absorption walls, FIG. 2 is obtained. In the case of no conventional radio wave absorption wall slit, the characteristics are remarkably deteriorated at a frequency of about 150 MHz or more. A return loss of 14 dB or more is obtained in the VHF frequency band. D
1 represents the thickness of the concrete layer between the back surface of the ferrite and the front surface of the reflector, D2 represents the thickness of the ferrite, and D3 represents the thickness of the exterior material.
尚、スリットが0.2mm未満ではスリットなしと比べほ
とんど改善されず、またスリット6mm以上では全て10db
以下の反射減衰量となり有効な電波吸収特性が得られな
い。従って、本発明の複数個のフェライト板間のわずか
な隙間は100mm長さに対し、0.2〜0.5mmで有効であり、
望ましくは0.3〜2mmの間にある場合に優れた電波吸収性
能を発揮する。これらの隙間寸法について磁性体連続部
と隙間の比率で表現すると、本発明で言う隙間は0.2mm/
100mm（0.2％）〜5mm/100mm（５％）で有効であり、望
ましくは0.3mm/100mm（0.3％）〜2mm/100mm（２％）が
好ましい。If the slit is less than 0.2 mm, there is almost no improvement compared to no slit, and if the slit is 6 mm or more, all are 10 db.
The following return loss results, and no effective radio wave absorption characteristics can be obtained. Therefore, the slight gap between the plurality of ferrite plates of the present invention is effective at 0.2 to 0.5 mm for a length of 100 mm,
Desirably, when the thickness is between 0.3 and 2 mm, excellent radio wave absorption performance is exhibited. When these gap dimensions are expressed by the ratio of the magnetic material continuous portion and the gap, the gap referred to in the present invention is 0.2 mm /
It is effective in the range of 100 mm (0.2%) to 5 mm / 100 mm (5%), preferably 0.3 mm / 100 mm (0.3%) to 2 mm / 100 mm (2%).
なお、磁気的な隙間には非磁性体（例えば塩化ビニ
ル）が充填される。The magnetic gap is filled with a non-magnetic material (for example, vinyl chloride).
（発明の効果） 以上説明したように、本発明によれば、電波吸収特性
を有する複数個のフェライト等の磁性体板に磁性体の磁
界成分方向の長さの0.2〜5.0％の比となる隙間を設ける
ことにより、磁気特性の周波数分散を制御することがで
き、その結果電波吸収特性の制御が可能となった。この
ことにより、例えば外装材の厚さが厚い電波吸収壁にお
いて、従来のフェライト等の磁性体板を密着させて配列
した場合、低周波に良好な電波吸収特性となり、高周波
で電波吸収特性の劣化がおこる点を改善し、必要な周波
数に合わせた優れた電波吸収特性が得られる。高層建築
物に適した美観、強度共に優れる外装材を有し、電波吸
収特性に優れた電波吸収壁を提供できる。(Effects of the Invention) As described above, according to the present invention, a ratio of 0.2 to 5.0% of the length in the magnetic field component direction of the magnetic material to a plurality of magnetic plates such as ferrite having radio wave absorption characteristics is obtained. By providing the gap, the frequency dispersion of the magnetic characteristics can be controlled, and as a result, the electromagnetic wave absorption characteristics can be controlled. As a result, for example, when a conventional magnetic material plate such as ferrite is arranged in close contact with a radio wave absorbing wall having a thick outer material, good radio wave absorption characteristics are obtained at low frequencies, and the radio wave absorption characteristics are deteriorated at high frequencies. Is improved, and excellent radio wave absorption characteristics adapted to a required frequency can be obtained. It is possible to provide a radio wave absorbing wall having excellent radio wave absorption characteristics, having an exterior material suitable for a high-rise building and having both excellent appearance and strength.
第１図（イ）及び（ロ）は、本発明の一実施例の電波吸
収壁を示す正面斜視図及び断面図、第２図は本実施例の
電波吸収壁の電波吸収特性を示す図、第３図、第４図、
第５図、第６図は従来の電波吸収壁の正面斜視図及び横
断面図、第７図は外装材の厚さに変化に対する電波吸収
特性の変化を示す図、第８図は磁性体間にわずかな隙間
（スリット）を設けた構造図、第９図は磁性体間にわず
かな隙間を設けた場合の磁気特性の変化を示す図であ
る。 11,31,41,51,61,81……フェライト 12,32,42,52,62……電波反射体 13,43,53,63……コンクリート又はモルタル 44……貫通孔 45……芯線 16,66……外装材 17,87……わずかな隙間（スリット） 18,88……塩ビ等の薄板1 (a) and 1 (b) are a front perspective view and a sectional view showing a radio wave absorbing wall of one embodiment of the present invention, and FIG. 2 is a diagram showing a radio wave absorbing characteristic of the radio wave absorbing wall of this embodiment. FIG. 3, FIG. 4,
5 and 6 are a front perspective view and a cross-sectional view of a conventional radio wave absorption wall, FIG. 7 is a diagram showing a change in radio wave absorption characteristics with respect to a change in the thickness of the exterior material, and FIG. FIG. 9 is a diagram showing a change in magnetic characteristics when a slight gap is provided between magnetic bodies. 11,31,41,51,61,81 Ferrite 12,32,42,52,62 Radio wave reflector 13,43,53,63 Concrete or mortar 44 Through hole 45 Core wire 16 , 66… Exterior material 17,87… Small gap (slit) 18,88… Thin sheet of PVC etc.
フロントページの続き (72)発明者 栗原 弘 東京都中央区日本橋１丁目13番１号 テ ィーディーケイ株式会社内 (72)発明者 平井 義人 東京都中央区日本橋１丁目13番１号 テ ィーディーケイ株式会社内 (56)参考文献 特開 昭63−66998（ＪＰ，Ａ) 実開 昭52−112746（ＪＰ，Ｕ)Continuation of the front page (72) Inventor Hiroshi Kurihara 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation (72) Inventor Yoshito Hirai 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation (56) References JP-A-63-66998 (JP, A) JP-A-52-112746 (JP, U)
Claims (8)
て構成される電波吸収壁において、 前記各磁性体を、到来電波の電界成分の方向に不連続と
なる如く間隔をあけて配設し、磁界成分の方向に磁性体
各々を１つの磁性体の磁界成分方向の長さの0.2〜5.0％
の磁気的な隙間をあけて結合させたことを特徴とする電
波吸収壁。1. A radio wave absorbing wall comprising an outer wall material disposed on a surface of a plurality of magnetic bodies, wherein said magnetic bodies are spaced apart from each other so as to be discontinuous in a direction of an electric field component of an incoming radio wave. Arranged, each magnetic body in the direction of the magnetic field component 0.2 to 5.0% of the length of one magnetic body in the direction of the magnetic field component
A radio wave absorption wall characterized by being joined with a magnetic gap.
波反射材料を埋没させて、コンクリート，モルタル等の
建築部材の表面、または内部に埋没させていることを特
徴とする、特許請求の範囲第１項に記載の電波吸収壁。2. The patent, wherein the magnetic material is buried in a surface or inside a building member such as concrete or mortar by burying a radio wave reflecting material such as a reinforcing bar, a wire mesh, a metal plate or the like. The radio wave absorbing wall according to claim 1.
波反射材料を埋没させて、コンクリート，モルタル等の
建物外壁となる建築材料内部、または表面に埋没させた
ことを特徴とする、特許請求の範囲第１項に記載の電波
吸収壁。3. The magnetic material according to claim 1, wherein a radio wave reflecting material such as a reinforcing bar, a wire mesh, a metal plate, or the like is buried in the inside or on the surface of a building material such as concrete or mortar, which becomes an outer wall of the building. The radio wave absorbing wall according to claim 1.
を特徴とする特許請求の範囲第１項に記載の電波吸収
壁。4. The radio wave absorbing wall according to claim 1, wherein said gap is filled with a non-magnetic material.
て構成される電波吸収壁において、 前記各磁性体を、到来電波の電界成分の方向に不連続と
なる如く間隔をあけて配設し、磁界成分の方向に一部は
連続して結合し、一部は磁性体連続部の長さの0.2〜5.0
％の磁気的な隙間をあけて結合させたことを特徴とする
電波吸収壁。5. A radio wave absorbing wall comprising an outer wall material arranged on a surface of a plurality of magnetic bodies, wherein said magnetic bodies are spaced apart from each other so as to be discontinuous in a direction of an electric field component of an incoming radio wave. The part is continuously coupled in the direction of the magnetic field component, and the part is 0.2 to 5.0
A radio wave absorption wall, which is combined with a magnetic gap of%.
波反射材料を埋没させて、コンクリート，モルタル等の
建築部材の表面、又は内部に埋没させていることを特徴
とする、特許請求の範囲第５項に記載の電波吸収壁。6. The patent, wherein the magnetic material is buried in a surface or inside a building member such as concrete or mortar by burying a radio wave reflecting material such as a reinforcing bar, a wire mesh, a metal plate or the like. The radio wave absorbing wall according to claim 5.
波反射材料を埋没させて、コンクリート，モルタル等の
建物外壁となる建築材料内部、又は表面に埋没させたこ
とを特徴とする、特許請求の範囲第５項に記載の電波吸
収壁。7. The magnetic material is characterized in that a radio wave reflecting material such as a reinforcing bar, a wire mesh, a metal plate or the like is buried therein, and is buried inside or on a surface of a building material such as concrete or mortar, which serves as an outer wall of the building. The radio wave absorption wall according to claim 5.
を特徴とする特許請求の範囲第５項に記載の電波吸収
壁。8. The radio wave absorbing wall according to claim 5, wherein said gap is filled with a non-magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63323765A JP2582632B2 (en) | 1988-12-23 | 1988-12-23 | Radio wave absorption wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63323765A JP2582632B2 (en) | 1988-12-23 | 1988-12-23 | Radio wave absorption wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02170599A JPH02170599A (en) | 1990-07-02 |
| JP2582632B2 true JP2582632B2 (en) | 1997-02-19 |
Family
ID=18158375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63323765A Expired - Lifetime JP2582632B2 (en) | 1988-12-23 | 1988-12-23 | Radio wave absorption wall |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2582632B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0635519Y2 (en) * | 1990-11-29 | 1994-09-14 | 日立フェライト株式会社 | Radio wave absorption wall |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52112746U (en) * | 1976-02-20 | 1977-08-26 | ||
| US4186274A (en) * | 1978-06-22 | 1980-01-29 | Bose Corporation | Sound system control |
| JPS6366998A (en) * | 1986-09-08 | 1988-03-25 | フジタ工業株式会社 | Shaped ferrite member for absorbing electric wave |
| JPH0230200A (en) * | 1988-07-20 | 1990-01-31 | Inax Corp | Wave-absorbing wall body |
-
1988
- 1988-12-23 JP JP63323765A patent/JP2582632B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02170599A (en) | 1990-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH09186484A (en) | Wide band electronic waves absorber | |
| JP2582632B2 (en) | Radio wave absorption wall | |
| JP2791937B2 (en) | Radio wave absorption wall for building materials | |
| JPH05267880A (en) | Radio wave absorbing wall | |
| JP3509936B2 (en) | Radio wave absorber, precast concrete plate and curtain wall | |
| JPH0834355B2 (en) | Radio wave absorption wall | |
| JPH11274787A (en) | Ferrite radio wave absorber | |
| JP2823134B2 (en) | Radio wave absorbing wall and tile unit | |
| JPH0638475Y2 (en) | Radio wave absorption wall | |
| JP4064798B2 (en) | Radio wave absorption panel | |
| JPH0828591B2 (en) | Radio wave absorption wall | |
| JPH02196500A (en) | Cladding tile | |
| JPH0635519Y2 (en) | Radio wave absorption wall | |
| JPH10135682A (en) | Multilayered radio wave absorber | |
| JP2804716B2 (en) | Radio wave absorption panel | |
| KR100325918B1 (en) | Wide-band ferrite electromagnetic wave absorber | |
| JP2968186B2 (en) | Radio wave absorption wall | |
| JPH08340192A (en) | Radio wave absorbing wall | |
| JPH04294599A (en) | Electric wave absorber | |
| JP2598804B2 (en) | Indoor wireless zone configuration method | |
| JPH0774494A (en) | Radio-wave absorbing panel | |
| JPH0638476Y2 (en) | Radio wave absorption wall | |
| JPH06120726A (en) | Radio wave absorbing wall | |
| JPH0132394Y2 (en) | ||
| JPH02170496A (en) | Wave absorption structure body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071121 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081121 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091121 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091121 Year of fee payment: 13 |