JP2000323920A - Frequency selective radio wave shield body - Google Patents
Frequency selective radio wave shield bodyInfo
- Publication number
- JP2000323920A JP2000323920A JP13287399A JP13287399A JP2000323920A JP 2000323920 A JP2000323920 A JP 2000323920A JP 13287399 A JP13287399 A JP 13287399A JP 13287399 A JP13287399 A JP 13287399A JP 2000323920 A JP2000323920 A JP 2000323920A
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- frequency
- dielectric
- wavelength
- metal wire
- 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.)
- Granted
Links
Landscapes
- Building Environments (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電波遮蔽体に関す
るもので、特に特定波長の電波を選択的に遮蔽する電波
遮蔽体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave shield, and more particularly to a radio wave shield for selectively blocking radio waves of a specific wavelength.
【０００２】[0002]
【従来の技術】近年、事業所内ＰＨＳや無線ＬＡＮの利
用が広がりを見せるなか、情報の漏洩防止や外部からの
侵入電波による誤動作やノイズ防止といった点から、オ
フィス内での電波環境を整えることが不可欠になってお
り、そのような電波環境の整備用部材として、既に種々
のタイプのものが提案されている。2. Description of the Related Art In recent years, as the use of PHS and wireless LAN in offices has been expanding, it has become necessary to improve the radio wave environment in offices in order to prevent information leakage and malfunctions and noises caused by external intrusion waves. Various types have already been proposed as members for maintaining such a radio wave environment.
【０００３】例えば、特公平６−９９９７２号公報に
は、金属やフェライトなどの電磁シ−ルド部材をビルの
躯体に付加することで、広い周波数帯域で任意の周波数
の電波を使って情報通信が出来る電磁シ−ルド・インテ
ルジェントビルを提供することが述べられている。[0003] For example, Japanese Patent Publication No. 6-99972 discloses that by adding an electromagnetic shield member such as metal or ferrite to a building body, information communication using radio waves of any frequency in a wide frequency band is performed. It is stated to provide a possible electromagnetic shield intelligent building.
【０００４】しかし、このような鉄板、金属網、金属メ
ッシュ、金属箔などの電波反射体やフェライトなどの電
波吸収体を電磁シ−ルド部材として用いたものでは、そ
れらの電磁シ−ルド性に周波数選択性が無いため、遮蔽
しようとする周波数以外の電波まで遮蔽してしまう。However, when a radio wave reflector such as an iron plate, a metal net, a metal mesh, or a metal foil, or a radio wave absorber such as a ferrite is used as an electromagnetic shield member, the electromagnetic shield property is reduced. Since there is no frequency selectivity, radio waves other than the frequency to be shielded are shielded.
【０００５】また前記電波反射体はテレビ電波を反射
し、受信障害（ゴ−ストの発生）の原因となるため用い
ることが出来る箇所が制限される。さらに、電磁シ−ル
ド部材間の隙間によってシ−ルド性能が大きく低下する
ため、個々の部材が持つシ−ルド性能を十分発揮させる
には、部材間の接続や接地など施工面での厳密性が要求
される。[0005] Further, the radio wave reflector reflects television radio waves and causes a reception failure (generation of ghost), so that a usable portion is limited. Furthermore, since the shielding performance is greatly reduced by the gap between the electromagnetic shielding members, strictness in the construction aspects such as connection between members and grounding is required to sufficiently exhibit the shielding performance of each member. Is required.
【０００６】特開平１０−１６９０３９号公報は、この
ような問題点を解消するもので、線状のアンテナ素子を
定期的に配列させることで遮蔽しようとする特定周波数
の電波のみを遮蔽し、部材間の接続や接地も必要ないと
いう優れたものである。しかし、その遮蔽は反射損失に
よるものが大部分であるため、オフィス内部において反
射電波による画面の揺らぎや誤動作などが起こる場合が
あるのが問題である。Japanese Unexamined Patent Publication No. Hei 10-169039 solves such a problem, and a linear antenna element is periodically arranged to shield only a radio wave of a specific frequency to be shielded. It is excellent because no connection or grounding is required. However, since most of the shielding is caused by reflection loss, there is a problem that the screen may fluctuate or malfunction due to reflected radio waves inside the office.
【０００７】特開平９−１６２５８９号公報や特開平５
−３３５８３２号公報の発明は、共にこのようなオフィ
ス内部における電波反射に起因する問題を解消するも
の、即ち特定周波数の電波を選択的に吸収するものであ
り、特開平９−１６２５８９号公報の発明は、導電体よ
り大きく絶縁体より小さい電気抵抗値を持つエレメント
を配列させて特定周波数（以上）の電波を吸収するも
の、特開平５−３３５８３２号公報の発明は、抵抗皮膜
と電波反射体とを誘電体（厚さがこの誘電体内における
電波波長の４分の１）を挟んで配置し特定周波数の電波
のみを選択的に吸収する、いわゆるλ／４型電波吸収体
に関するものである。[0007] JP-A-9-162589 and JP-A-Hei-5
The invention disclosed in Japanese Patent Application Laid-Open No. Hei 9-162589 solves such a problem caused by radio wave reflection inside the office, that is, selectively absorbs a radio wave of a specific frequency. Japanese Patent Application Laid-Open No. Hei 5-33532 discloses an arrangement in which elements having an electric resistance value larger than a conductor and smaller than an insulator are arranged to absorb a radio wave of a specific frequency (or more). And a so-called λ / 4-type radio wave absorber, which is disposed with a dielectric (thickness of 電波 of the radio wave wavelength in the dielectric) interposed therebetween and selectively absorbs only radio waves of a specific frequency.
【０００８】しかし、これらの電波吸収体にもそれぞれ
以下に述べるような欠点がある。即ち前者は電波の照射
によってエレメント内を流れる交流電流の抵抗損失によ
るものであるため、微小な体積のエレメントでは、遮蔽
しようとする周波数の電波においても実際的には透過が
多くなり吸収可能な電波量は僅少になる。However, each of these radio wave absorbers also has the following disadvantages. In other words, the former is due to the resistance loss of the alternating current flowing through the element due to the irradiation of the radio wave. The amount will be insignificant.
【０００９】また後者は吸収量が前者に比して大きく、
周波数選択性にも優れるが、誘電体の裏側を金属箔や金
属網などの電波反射体で裏打ちするため、遮蔽しようと
する周波数以外の電波は反射してしまう。即ちその周波
数選択性は抵抗皮膜側から到来する電波の反射成分に対
してのみのものである。The latter has a larger absorption than the former,
Although it is excellent in frequency selectivity, since the back side of the dielectric is lined with a radio wave reflector such as a metal foil or a metal net, radio waves other than the frequency to be shielded are reflected. That is, the frequency selectivity is only for the reflection component of the radio wave coming from the resistive film side.
【００１０】さらに反射体側から到来する電波に対して
は周波数に関係なく反射してしまい、上述したテレビ電
波受信障害の原因となる可能性がある。Further, radio waves arriving from the reflector side are reflected irrespective of the frequency, which may cause the above-mentioned TV radio wave reception trouble.
【００１１】[0011]
【発明が解決しようとする課題】本発明は、上記ような
従来の電波遮蔽体が持つ不都合を解消することを目的と
したものである。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the conventional radio wave shield.
【００１２】即ち、電波遮蔽体間の接続や接地の必要が
ない施工性に優れた電波遮蔽体であり、この電波遮蔽体
を用いて電波遮蔽室を形成した場合に、室内での専用通
信（事業所ＰＨＳや無線ＬＡＮなど）に使用する電波の
室内での反射や室外からの侵入に起因する画面の揺らぎ
や誤動作などが起こらず、また上記以外の電波は双方向
に透過して外部との通信や公共放送の受信が可能になっ
たり、テレビ電波の受信障害の源となることもないよう
な電波遮蔽体を提供することを目的としたものである。That is, a radio wave shield excellent in workability which does not require connection between the radio wave shields and grounding. When a radio wave shield room is formed using the radio wave shield, dedicated indoor communication ( (Such as office PHS and wireless LAN), the screen does not fluctuate or malfunction due to the reflection inside the room or the intrusion from the outside of the room. It is an object of the present invention to provide a radio wave shield that does not allow reception of communication and public broadcasts and does not become a source of interference with reception of television radio waves.
【００１３】つまり、特定電波のうち、一方から入射す
るものを反射し、他方から入射するものを吸収するとと
もにそれ以外の電波はどちらから入射する場合も透過す
ることを特徴とする電波遮蔽体が望まれていた。In other words, a radio wave shield characterized by reflecting a specific radio wave incident from one side, absorbing a radio wave incident from the other, and transmitting the other radio waves regardless of the incident direction. Was desired.
【００１４】[0014]
【課題を解決するための手段】本発明は、前記の目的を
達成するためのものであって、請求項１記載の発明は、
抵抗体皮膜と、遮蔽しようとする電波の周波数に対応し
た特定の長さを有する金属線素子が配設された電波反射
面とを、該電波波長の約４分の１（但し、該電波波長は
誘電体中での波長）の厚さを持つ誘電体を挟んで配置し
たことを特徴とする周波数選択性電波遮蔽体を提供する
ものである。SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object.
The resistor film and the radio wave reflecting surface on which the metal wire element having a specific length corresponding to the frequency of the radio wave to be shielded is disposed at about one quarter of the radio wave wavelength (however, the radio wave wavelength The present invention provides a frequency-selective radio wave shield characterized in that a dielectric having a thickness of (wavelength in a dielectric) is interposed therebetween.
【００１５】請求項２記載の発明は、抵抗体皮膜、誘電
体、パターン化されている金属線素子が順に形成されて
いる周波数選択性電波遮蔽体において、前記金属線素子
パターンが前記誘電体の厚みの４倍が誘電体中の波長と
なる電波について遮蔽性を持つパターンとなっているこ
とを特徴とする周波数選択性電波遮蔽体を提供するもの
である。According to a second aspect of the present invention, in the frequency selective radio wave shield in which a resistor film, a dielectric, and a patterned metal wire element are sequentially formed, the metal wire element pattern is formed of the dielectric material. An object of the present invention is to provide a frequency-selective radio wave shield characterized in that the pattern has a shielding property for radio waves whose wavelength is four times the thickness of the dielectric material.
【００１６】請求項３記載の発明は、前記金属線素子が
開放端を持ち、開放端間の長さが遮蔽しようとする電波
の誘電体中における波長の約２分の１であることを特徴
とする請求項１または２記載の周波数選択性電波遮蔽体
を提供するものである。According to a third aspect of the present invention, the metal wire element has an open end, and the length between the open ends is about one half of the wavelength of the radio wave to be shielded in the dielectric. A frequency selective radio wave shield according to claim 1 or 2 is provided.
【００１７】請求項４記載の発明は、前記金属線素子が
環状であり、その周囲の長さが遮蔽しようとする電波の
誘電体中における波長にほぼ等しいことを特徴とする請
求項１または２記載の周波数選択性電波遮蔽体を提供す
るものである。According to a fourth aspect of the present invention, the metal wire element has an annular shape, and a length around the metal wire element is substantially equal to a wavelength of a radio wave to be shielded in the dielectric. It provides a frequency-selective radio wave shield as described.
【００１８】請求項５記載の発明は、前記抵抗体皮膜
が、その表面での電波の反射が１０％以下であるような
インピ−ダンスを持つことを特徴とする請求項１から４
の何れかに記載の周波数選択性電波遮蔽体を提供するも
のである。The invention according to claim 5 is characterized in that the resistor film has an impedance such that the reflection of radio waves on its surface is 10% or less.
And a frequency-selective radio wave shield according to any one of the above.
【００１９】なお、本発明でいう電波は、３０００ＧＨ
ｚ以下の電磁波を示す。The radio wave referred to in the present invention is 3000 GHz.
Shows electromagnetic waves below z.
【００２０】[0020]
【発明の実施の形態】以下、本発明を図面を用いて詳細
に説明する。図１は、本発明の周波数選択性電波遮蔽体
の断面図の一例を示したものであり、電波遮蔽体１０
は、抵抗体皮膜１１、誘電体１２、金属線素子１３を配
設した電波反射面１４からなる。また図中の矢印Ａ、Ｂ
はそれぞれ電波の到来方向を表したものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a cross-sectional view of a frequency-selective radio wave shield of the present invention.
Consists of a radio wave reflecting surface 14 on which a resistor film 11, a dielectric 12, and a metal wire element 13 are disposed. Arrows A and B in the figure
Represents the direction of arrival of the radio wave.
【００２１】ここで抵抗体皮膜１１は、金属箔、金属網
や金属、金属酸化物、金属窒化物あるいはその混合物の
蒸着膜、スパッタリング膜、ＣＶＤ膜（ＣＶＤ：化学的
蒸着）あるいはその積層体、炭素粒子などの抵抗体粒子
をゴムや高分子樹脂中に分散させた複合型抵抗体など、
その形態や製造方法、厚さなどに本質的な限定を受ける
ものではないが、Ａ方向から到来する遮蔽しようとする
電波を十分吸収するため、その表面での反射を約１０％
程度に抑えるようなインピ−ダンスを持つことが要求さ
れる。Here, the resistor film 11 is formed of a metal foil, a metal net, a metal, a metal oxide, a metal nitride or a mixture thereof, a vapor deposition film, a sputtering film, a CVD film (CVD: chemical vapor deposition) or a laminate thereof, Composite resistors in which resistor particles such as carbon particles are dispersed in rubber or polymer resin,
Although the form, manufacturing method, thickness and the like are not essentially limited, the reflection on the surface is reduced by about 10% in order to sufficiently absorb the radio wave coming from the direction A to be shielded.
It is required to have an impedance that keeps it to a minimum.
【００２２】一般に、電波がある媒体Ａ中から他の媒体
Ｂへ入射する場合、Ａ／Ｂ界面での電波の反射係数Ｓab
は（式１）で表される。（図９参照）In general, when a radio wave is incident from one medium A to another medium B, the reflection coefficient S ab of the radio wave at the A / B interface
Is represented by (Equation 1). (See Fig. 9)
【００２３】[0023]
【式１】 (Equation 1)
【００２４】ここで媒体ＢがＺB ≒０の導体であった場
合、Ａ／Ｂ界面での電波の反射係数Ｓabがほぼ−１とな
って電波はＡ／Ｂ界面で完全に反射され、媒体Ａ中に大
きな定在波が立つ。この時媒体Ａ中での負荷インピ−ダ
ンスＺの値は、（式２）で表されるように界面（Ｘ＝
０）で０であり、Ｘ＝λ／４（λは電波の波長）の所で
無限大∞になる。If the medium B is a conductor of Z B ≒ 0, the reflection coefficient S ab of the radio wave at the A / B interface becomes substantially −1, and the radio wave is completely reflected at the A / B interface. A large standing wave stands in the medium A. At this time, the value of the load impedance Z in the medium A is determined by the interface (X =
0), and becomes infinity Ｘ at X = λ / 4 (λ is the wavelength of the radio wave).
【００２５】[0025]
【式２】 (Equation 2)
【００２６】このＸ＝λ／４の位置にインピ−ダンスＲ
の抵抗体皮膜を置くと、この位置での負荷インピ−ダン
スはＲと∞との並列合成であるのでほぼＲとなり、この
位置での反射係数は（式３）で表される値になる。At the position of X = λ / 4, the impedance R
, The load impedance at this position is approximately R because of the parallel combination of R and ∞, and the reflection coefficient at this position is a value represented by (Equation 3).
【００２７】[0027]
【式３】 (Equation 3)
【００２８】即ち抵抗体皮膜のインピ−ダンスＲが、媒
体Ａ中での電波特性インピ−ダンスＺA に完全に等しけ
れば反射係数は０となるが、ＲもＺA も周波数によって
変化し、完全に一致させることは困難である。そこで実
際上問題がない電波遮蔽体を得るには、Ｒが反射係数を
１０％以下にするようなものである必要がある。That is, if the impedance R of the resistor film is completely equal to the radio wave characteristic impedance Z A in the medium A, the reflection coefficient becomes 0, but both R and Z A change with frequency, and It is difficult to match. Therefore, in order to obtain a radio wave shield having no practical problem, it is necessary that R has a reflection coefficient of 10% or less.
【００２９】ここで媒体Ａが空気や真空であればＺA は
自由空間の電波特性インピ−ダンス（≒３７７Ω）とな
り、図２に図示したように、ガラスや有機高分子などの
支持体もしくは保護材１５が電波の到来方向にある場合
にはその内部での電波特性インピ−ダンスとなる。If the medium A is air or vacuum, Z A becomes the impedance of radio wave characteristics in free space (≒ 377Ω), and as shown in FIG. When the material 15 is in the direction of arrival of the radio wave, the radio wave characteristic impedance inside the material 15 is obtained.
【００３０】誘電体１２は真空、空気、その他のガス、
ガラス、セラミックス、有機高分子などその材質に本質
的な制限を受けるものではないが、その厚さは上述した
理由から、遮蔽したい周波数の電波の波長λに対して、
ほぼλ／４であることが必要である。The dielectric 12 is made of vacuum, air, other gas,
Glass, ceramics, organic polymers and other materials are not essentially restricted, but the thickness is, for the reasons described above, the wavelength λ of the radio wave at the frequency to be shielded,
It needs to be approximately λ / 4.
【００３１】電波反射面１４は、金属線素子１３を誘電
体１２の表面に直接設けたものでも良いが、他の高分子
フィルムやガラス、セラミックス、紙などの上に金属線
素子を設けたものでも、その金属線素子側を誘電体１２
側に配置したものであれば良い。The radio wave reflecting surface 14 may be one in which the metal wire element 13 is provided directly on the surface of the dielectric 12, but one in which the metal wire element is provided on another polymer film, glass, ceramics, paper or the like. However, the metal wire element side is
What is necessary is just to be arrange | positioned at the side.
【００３２】電波が到来している場所に、接地されてい
ない金属棒や金属ワイヤ−などの導体を置いた場合、一
部の電波は吸収され、他は導体中を流れる交番電流が作
る電磁界との相互作用によって反射される。この時電波
の吸収量と反射量との比（吸収量／反射量）は導体のイ
ンピ−ダンスによって変わり、インピ−ダンスがほぼ０
であればその比もほぼ０となる。When a conductor such as a non-grounded metal rod or a metal wire is placed in a place where radio waves have arrived, some radio waves are absorbed and others are generated by an alternating current flowing through the conductor. Is reflected by the interaction with At this time, the ratio between the amount of radio wave absorption and the amount of reflection (absorption / reflection) changes depending on the impedance of the conductor, and the impedance is almost zero.
In that case, the ratio is almost zero.
【００３３】またこの吸収や反射は直接導体の表面に入
射する電波に対してだけでなく、その導体周囲の電波に
対しても起こる。但し、導体から離れれば離れる程、吸
収や反射量は少なくなる。導体と電波の吸収、反射など
の相互作用は導体と電波が共鳴する場合に大きくなる。This absorption or reflection occurs not only for radio waves directly incident on the surface of a conductor but also for radio waves around the conductor. However, the farther away from the conductor, the smaller the amount of absorption and reflection. Interaction such as absorption and reflection of a radio wave with a conductor increases when the radio wave resonates with the conductor.
【００３４】即ち図３から図５のように開放端を持つ線
状形状の導体を配列した面では、導体の開放端間の長さ
が電波波長の２分の１の場合に共鳴し、相互作用が大き
くなってこの面で殆ど反射する。言い換えるとこの長さ
の導体と共鳴しない波長（周波数）の電波にとってはこ
の面は反射面とはならずにその大部分が透過する。That is, as shown in FIGS. 3 to 5, on the surface on which linear conductors having open ends are arranged, resonance occurs when the length between the open ends of the conductor is half the radio wave wavelength, and The effect is increased and the light is almost reflected on this surface. In other words, for a radio wave of a wavelength (frequency) that does not resonate with a conductor of this length, this surface does not become a reflection surface, and most of it is transmitted.
【００３５】図３のような直線形状の場合にはその長さ
が電波波長の２分の１になり、図４や図５のように枝分
かれを持つ形状では中心点から開放端までの距離が電波
波長の４分の１となる。In the case of a linear shape as shown in FIG. 3, the length is one half of the radio wave wavelength, and in the case of a branched shape as shown in FIGS. 4 and 5, the distance from the center point to the open end is smaller. One quarter of the radio wave wavelength.
【００３６】また図６から図８のような環状の導体を配
した場合には、環状導体の周囲長が電波波長とほぼ等し
い場合に共鳴し、この配列面が特定周波数の電波に対す
る反射面となる。When an annular conductor as shown in FIG. 6 to FIG. 8 is provided, resonance occurs when the circumference of the annular conductor is substantially equal to the radio wave wavelength, and this arrangement surface is in contact with a reflection surface for radio waves of a specific frequency. Become.
【００３７】本発明は、以上に述べたような線状導体の
持つ性質を利用したもので、遮蔽しようとする周波数の
電波（但し、その波長は誘電体中での波長）と共鳴する
ような長さの金属線素子を配列することで電波反射面と
したものである。The present invention utilizes the properties of the linear conductor as described above, and is designed to resonate with a radio wave of a frequency to be shielded (however, its wavelength is a wavelength in a dielectric). A radio wave reflecting surface is formed by arranging metal wire elements having a length.
【００３８】このような電波反射面の反射性能は、実際
にはあるインピ−ダンスを持つ個々の金属線素子中を流
れる交番電流の大きさによって決まるため、その線幅や
厚さは大きい程、個々の金属線素子間の間隔は小さい程
良くなる。しかし同時に、遮蔽しようとする周波数の電
波以外の（周波数が赤外光以上のものを含む）電波の金
属線素子表面における反射も大きくなるため周波数選択
性が悪くなる。The reflection performance of such a radio wave reflecting surface is actually determined by the magnitude of the alternating current flowing in each metal wire element having a certain impedance. The smaller the distance between the individual metal wire elements, the better. However, at the same time, the reflection of radio waves other than the radio waves of the frequency to be shielded (including those whose frequency is higher than infrared light) on the surface of the metal wire element increases, so that the frequency selectivity deteriorates.
【００３９】そこで実用上は、遮蔽しようとする周波数
の電波に対する反射性能と周波数選択性を考慮して、金
属線素子の線幅、厚さ、個々の金属線素子間の間隔が決
定される。Therefore, in practical use, the line width and thickness of the metal wire element and the distance between the individual metal wire elements are determined in consideration of the reflection performance and frequency selectivity for radio waves of the frequency to be shielded.
【００４０】ここでは図３から図８まで、６種類の金属
線素子を図示したが、金属線素子の形状がこれらに限定
されるものでないことは、前記の説明で明らかである。Although FIGS. 3 to 8 show six types of metal wire elements, it is apparent from the above description that the shape of the metal wire elements is not limited to these.
【００４１】なお、本発明の電波遮蔽体を用いて電波遮
蔽室などを作る場合、電波反射面として個々に独立した
金属線素子の配列面を用いているため、電波遮蔽体同士
の接続や接地は必要ない。このことは施工性を極めて簡
便にするもので本発明の電波遮蔽体の大きな利点であ
る。When a radio wave shielding room or the like is formed by using the radio wave shielding of the present invention, since the array surface of the independent metal wire elements is used as the radio wave reflecting surface, the connection and the grounding of the radio wave shielding members are made. Is not required. This makes the workability extremely simple and is a great advantage of the radio wave shield of the present invention.
【００４２】[0042]
【発明の効果】以上の説明から明らかなように、本発明
によれば、電波遮蔽体間の接続や接地の必要がない施工
性に優れた電波遮蔽体を供給できる。As is apparent from the above description, according to the present invention, it is possible to supply a radio wave shield excellent in workability, which does not require connection between radio wave shields and grounding.
【００４３】また、本発明の電波遮蔽体は、遮蔽しよう
とする周波数の電波のうち、抵抗体皮膜側から到来する
ものは吸収、電波反射面側から到来するものは反射し、
さらにその他の周波数の電波（電波）は双方向に透過さ
せるという性質を有しているため、本発明の電波遮蔽体
を用いて電波遮蔽室を形成すると、室内での専用通信
（事業所ＰＨＳや無線ＬＡＮなど）に使用する電波の室
内での反射や室外からの侵入に起因する画面の揺らぎや
誤動作などの発生が防止できるとともに、外部との通信
や公共放送の受信、外部でのテレビ電波受信障害の発生
源となることの防止、などが可能である。In the radio wave shield of the present invention, of the radio waves of the frequency to be shielded, those arriving from the resistor film side are absorbed, and those arriving from the radio wave reflection surface side are reflected,
Furthermore, since radio waves (radio waves) of other frequencies have the property of being transmitted in both directions, if a radio wave shielding room is formed using the radio wave shielding body of the present invention, dedicated communication (such as a business office PHS or It can prevent screen fluctuations and malfunctions caused by reflections of radio waves used for wireless LAN, etc. in the room and intrusion from the outside, reception of external communications, reception of public broadcasts, and reception of TV radio waves outside. It is possible to prevent the occurrence of a failure.
【図１】本発明に係わる周波数選択性を有する電波遮蔽
体の実施の形態を示す断面図である。FIG. 1 is a sectional view showing an embodiment of a radio wave shield having frequency selectivity according to the present invention.
【図２】本発明に係わる周波数選択性を有する電波遮蔽
体の他の実施の形態を示す断面図である。FIG. 2 is a cross-sectional view showing another embodiment of the radio wave shield having frequency selectivity according to the present invention.
【図３】本発明に係わる周波数選択性を有する電波遮蔽
体の電波反射面（金属素子配列面）を示す図である。FIG. 3 is a diagram showing a radio wave reflecting surface (metal element array surface) of a radio wave shield having frequency selectivity according to the present invention.
【図４】本発明に係わる周波数選択性を有する電波遮蔽
体の他の電波反射面（金属素子配列面）を示す平面図で
ある。FIG. 4 is a plan view showing another radio wave reflecting surface (metal element array surface) of the radio wave shield having frequency selectivity according to the present invention.
【図５】本発明に係わる周波数選択性を有する電波遮蔽
体の他の電波反射面（金属素子配列面）を示す平面図で
ある。FIG. 5 is a plan view showing another radio wave reflecting surface (metal element array surface) of the radio wave shield having frequency selectivity according to the present invention.
【図６】本発明に係わる周波数選択性を有する電波遮蔽
体の他の電波反射面（金属素子配列面）を示す平面図で
ある。FIG. 6 is a plan view showing another radio wave reflecting surface (metal element array surface) of the radio wave shield having frequency selectivity according to the present invention.
【図７】本発明に係わる周波数選択性を有する電波遮蔽
体の他の電波反射面（金属素子配列面）を示す平面図で
ある。FIG. 7 is a plan view showing another radio wave reflecting surface (metal element array surface) of the radio wave shield having frequency selectivity according to the present invention.
【図８】本発明に係わる周波数選択性を有する電波遮蔽
体の他の電波反射面（金属素子配列面）を示す平面図で
ある。FIG. 8 is a plan view showing another radio wave reflecting surface (metal element array surface) of the radio wave shield having frequency selectivity according to the present invention.
１０…電波遮蔽体 １１…抵抗体皮膜 １２…誘電体 １３…金属線素子 １４…金属線素子を配設した電波反射面 １５…抵抗体皮膜の支持体または保護材 DESCRIPTION OF SYMBOLS 10 ... Radio wave shield 11 ... Resistor film 12 ... Dielectric 13 ... Metal wire element 14 ... Radio wave reflection surface provided with metal wire element 15 ... Support or protection material of resistor film
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡野 滋 東京都台東区台東１丁目５番１号 凸版印 刷株式会社内 (72)発明者 難波 系治郎 東京都台東区台東１丁目５番１号 凸版印 刷株式会社内 (72)発明者 庭山 明 東京都台東区台東１丁目５番１号 凸版印 刷株式会社内 (72)発明者 橋本 修 東京都世田谷区千歳台６丁目16番１号 青 山学院大学内 Ｆターム(参考） 2E001 DH01 GA22 GA23 GA32 GA42 GA77 HA11 HA14 HB01 HC07 5E321 AA43 BB23 BB25 GG05 GG12 5J020 AA06 BA06 BD01 BD02 EA05 EA09 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Okano 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Inventor Genjiro Namba 1-1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Inventor Akira Niwayama 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Osamu Hashimoto 6-16-1, Chitosedai, Setagaya-ku, Tokyo Blue F-term at Yamagakuin University (reference) 2E001 DH01 GA22 GA23 GA32 GA42 GA77 HA11 HA14 HB01 HC07 5E321 AA43 BB23 BB25 GG05 GG12 5J020 AA06 BA06 BD01 BD02 EA05 EA09
Claims (5)
波数に対応した特定の長さを有する金属線素子が配設さ
れた電波反射面とを、該電波波長の約４分の１（但し、
該電波波長は誘電体中での波長）の厚さを持つ誘電体を
挟んで配置したことを特徴とする周波数選択性電波遮蔽
体。An electric wave reflecting surface provided with a metal wire element having a specific length corresponding to a frequency of an electric wave to be shielded is connected to a resistor film by approximately one quarter of the electric wave wavelength. However,
A frequency-selective radio wave shield comprising a dielectric having a thickness of (the radio wave wavelength is a wavelength in a dielectric).
る金属線素子が順に形成されている周波数選択性電波遮
蔽体において、前記金属線素子パターンが前記誘電体の
厚みの４倍が誘電体中の波長となる電波について遮蔽性
を持つパターンとなっていることを特徴とする周波数選
択性を有する電波遮蔽体。2. A frequency-selective radio wave shield in which a resistor film, a dielectric, and a patterned metal wire element are sequentially formed, wherein the metal wire element pattern has a thickness four times the thickness of the dielectric. A radio wave shield having frequency selectivity, wherein the radio wave shield has a pattern of shielding radio waves having wavelengths in the body.
の長さが遮蔽しようとする電波の誘電体中における波長
の約２分の１であることを特徴とする請求項１または２
記載の周波数選択性電波遮蔽体。3. The device according to claim 1, wherein the metal wire element has an open end, and a length between the open ends is about one half of a wavelength in a dielectric of a radio wave to be shielded. 2
The frequency-selective radio wave shield according to the above.
長さが遮蔽しようとする電波の誘電体中における波長に
ほぼ等しいことを特徴とする請求項１または２記載の周
波数選択性電波遮蔽体。4. The frequency-selective radio wave according to claim 1, wherein said metal wire element has a ring shape, and its peripheral length is substantially equal to a wavelength of a radio wave to be shielded in a dielectric. Shield.
射が１０％以下であるようなインピ−ダンスを持つこと
を特徴とする請求項１から４の何れかに記載の周波数選
択性電波遮蔽体。5. The frequency selectivity according to claim 1, wherein said resistor film has an impedance such that the reflection of a radio wave on its surface is 10% or less. Radio wave shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13287399A JP3613069B2 (en) | 1999-05-13 | 1999-05-13 | Frequency selective radio wave shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13287399A JP3613069B2 (en) | 1999-05-13 | 1999-05-13 | Frequency selective radio wave shield |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000323920A true JP2000323920A (en) | 2000-11-24 |
| JP3613069B2 JP3613069B2 (en) | 2005-01-26 |
Family
ID=15091560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13287399A Expired - Fee Related JP3613069B2 (en) | 1999-05-13 | 1999-05-13 | Frequency selective radio wave shield |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3613069B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003078276A (en) * | 2001-08-30 | 2003-03-14 | Toppan Printing Co Ltd | Radio wave absorber |
| JP2008047594A (en) * | 2006-08-11 | 2008-02-28 | Mitsubishi Cable Ind Ltd | Radio wave absorber and radio wave shielding |
| JP2013096743A (en) * | 2011-10-28 | 2013-05-20 | Denki Kogyo Co Ltd | Radio reflection box of propagation environment control type |
| JP2014241354A (en) * | 2013-06-12 | 2014-12-25 | パナソニック株式会社 | Band selection polarization shield, manufacturing method of band selection polarization shield, display device and display apparatus |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5674838B2 (en) * | 2013-03-04 | 2015-02-25 | 電気興業株式会社 | Antenna device |
-
1999
- 1999-05-13 JP JP13287399A patent/JP3613069B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003078276A (en) * | 2001-08-30 | 2003-03-14 | Toppan Printing Co Ltd | Radio wave absorber |
| JP2008047594A (en) * | 2006-08-11 | 2008-02-28 | Mitsubishi Cable Ind Ltd | Radio wave absorber and radio wave shielding |
| JP2013096743A (en) * | 2011-10-28 | 2013-05-20 | Denki Kogyo Co Ltd | Radio reflection box of propagation environment control type |
| JP2014241354A (en) * | 2013-06-12 | 2014-12-25 | パナソニック株式会社 | Band selection polarization shield, manufacturing method of band selection polarization shield, display device and display apparatus |
| JP2014241353A (en) * | 2013-06-12 | 2014-12-25 | パナソニック株式会社 | Band selection transparent shield, manufacturing method of band selection transparent shield, display device using the same and display apparatus |
| JP2020038879A (en) * | 2018-09-03 | 2020-03-12 | リンテック株式会社 | Electromagnetic wave absorbing film and electromagnetic wave absorbing sheet |
| JP2020038878A (en) * | 2018-09-03 | 2020-03-12 | リンテック株式会社 | Reflection film for electromagnetic wave absorption sheet, and electromagnetic wave absorption sheet |
| JP7175142B2 (en) | 2018-09-03 | 2022-11-18 | リンテック株式会社 | Reflective film for electromagnetic wave absorption sheet, electromagnetic wave absorption sheet |
| JP7264608B2 (en) | 2018-09-03 | 2023-04-25 | リンテック株式会社 | Electromagnetic wave absorbing film, electromagnetic wave absorbing sheet |
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| Publication number | Publication date |
|---|---|
| JP3613069B2 (en) | 2005-01-26 |
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