JP2007134642A - Radio security room and radio security system - Google Patents

Radio security room and radio security system Download PDF

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Publication number
JP2007134642A
JP2007134642A JP2005328717A JP2005328717A JP2007134642A JP 2007134642 A JP2007134642 A JP 2007134642A JP 2005328717 A JP2005328717 A JP 2005328717A JP 2005328717 A JP2005328717 A JP 2005328717A JP 2007134642 A JP2007134642 A JP 2007134642A
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room
base station
wireless
wireless security
radio
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Tomonori Sugiyama
智則 杉山
Hisahiro Matsushita
尚弘 松下
Masakazu Kato
雅一 加藤
Yasuaki Kasai
泰彰 笠井
Hiromichi Sugimoto
弘道 杉本
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Obayashi Corp
Toshiba TEC Corp
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Obayashi Corp
Toshiba TEC Corp
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  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To easily prevent someone from getting access to an indoor radio base station from the outside by a simple and inexpensive construction. <P>SOLUTION: The wall 11, ceiling 12, and floor 13 of a room are formed of general building materials, such as electro-conductive, flexible and moisture-resistant plaster boards, metal plate-backed OA floor panels, etc. to construct a radio security room 10. A desk 14 is arranged at the center of the radio security room 10, and a leakage transmission line 16 is arranged on the desk 14. The starting end of the leakage transmission line 16 is connected to the radio base station 15, and its terminating end is connected to a terminator 17. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、無線基地局のアンテナを構成する漏洩伝送路を敷設する部屋をシールドして構築した無線セキュリティルーム及び無線セキュリティシステムに関する。   The present invention relates to a wireless security room and a wireless security system constructed by shielding a room in which a leaky transmission path constituting an antenna of a wireless base station is laid.

部屋内に無線ＬＡＮを敷設した無線通信システムの利用が増えている。このような無線通信システムを多数の部屋が集まっているビル等の建物で使用すると、ある部屋に敷設された無線通信システムにおいて発信した電波が他の部屋に漏れ、これにより、他の部屋に敷設されている無線通信システムに影響を与えるという問題があった。また、逆に、他の部屋の無線通信システムからの電波をある部屋の無線通信システムが受けてしまい、その結果、他の部屋からアクセスされるという問題があった。   The use of a wireless communication system in which a wireless LAN is laid in a room is increasing. When such a wireless communication system is used in a building such as a building where a large number of rooms are gathered, radio waves transmitted in the wireless communication system laid in one room leak into another room, thereby laying in another room. There has been a problem of affecting the wireless communication system being used. On the other hand, there is a problem in that a radio communication system in a room receives radio waves from the radio communication system in another room, and as a result, it is accessed from another room.

このような問題を解決するものとして、部屋の床、天井、壁の表層部に電磁遮蔽材を用いて電磁遮蔽空間を形成し、部屋外にホイップアンテナを使用した無線通信システムの電波が漏れないようにしたものが知られている（例えば、特許文献１参照）。
特開平１１−１３４５８６号公報 In order to solve such problems, electromagnetic shielding space is formed on the floor, ceiling, and wall of the room using electromagnetic shielding material, and radio waves of wireless communication systems using whip antennas are not leaked outside. What was made is known (for example, refer patent document 1).
Japanese Patent Laid-Open No. 11-134586

しかしながら、特許文献１記載のものは、部屋の床、天井、壁の表層部に電磁遮蔽材を用いて電磁遮蔽空間を形成するものであり、電磁遮蔽材の施工には厳密な繋ぎ目処理など厳しい施工管理が必要不可欠であり、施工には専門業者が必要となる。また、ホイップアンテナを使用した無線ＬＡＮの電波を遮蔽するためには５０〜６０ｄＢ以上の電磁遮蔽性能が必要となる。また、ホイップアンテナを使用した無線ＬＡＮに５０〜６０ｄＢ以上の電磁遮蔽材を組み合わせたシステムでは、部屋内が反射環境となるためマルチパス遅延障害が発生し、無線ＬＡＮのデータ通信速度が低下するという問題があるため、部屋の壁にさらに電波吸収体などを設ける必要がある。   However, the thing of patent document 1 forms an electromagnetic shielding space in the floor of a room, a ceiling, and the surface layer part of a wall using an electromagnetic shielding material, and a strict joint process etc. are used for construction of an electromagnetic shielding material etc. Strict construction management is indispensable, and specialists are required for construction. Moreover, in order to shield the radio wave of the wireless LAN using the whip antenna, an electromagnetic shielding performance of 50 to 60 dB or more is required. In addition, in a system in which an electromagnetic shielding material of 50 to 60 dB or more is combined with a wireless LAN using a whip antenna, a multipath delay failure occurs due to a reflection environment in the room, and the data communication speed of the wireless LAN decreases. Since there is a problem, it is necessary to further provide a radio wave absorber on the wall of the room.

このようなことから、特許文献１記載のものは多大な費用が掛かるという問題があった。
本発明は、部屋内の無線基地局と外部とのアクセスの防止を簡易かつ安価な施工によって実現できる無線セキュリティルーム及び無線セキュリティシステムを提供する。 For this reason, the one described in Patent Document 1 has a problem that it takes a great deal of cost.
The present invention provides a wireless security room and a wireless security system capable of preventing access between a wireless base station in a room and the outside by simple and inexpensive construction.

本発明は、無線基地局のアンテナを構成する漏洩伝送路を敷設する部屋であって、部屋は、壁、天井、床、ドア、窓等の各部位の１又は複数箇所に導電性の建材を使用し、局所的なシールド性能が１５ｄＢ以上で、かつ、全体における各部位のシールド性能の平均が２５ｄＢ以上に設定した無線セキュリティルームにある。   The present invention is a room in which a leaky transmission path constituting an antenna of a radio base station is laid, and the room has a conductive building material in one or a plurality of parts such as a wall, a ceiling, a floor, a door, and a window. It is used in a wireless security room where the local shielding performance is 15 dB or more and the average shielding performance of each part in the whole is set to 25 dB or more.

本発明によれば、部屋内の無線基地局と外部とのアクセスの防止を簡易かつ安価な施工によって実現できる無線セキュリティルーム及び無線セキュリティシステムを提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the wireless security room and wireless security system which can implement | achieve prevention of the access with the wireless base station in a room and the exterior by simple and cheap construction can be provided.

以下、本発明の実施の形態を、図面を参照して説明する。
図１及び図２に示すように、上下階とコンクリート１，２で仕切られたフロア３に無線セキュリティルーム１０を形成している。なお、４，５はコンクリートの壁である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, a wireless security room 10 is formed on a floor 3 partitioned by upper and lower floors and concrete 1 and 2. In addition, 4 and 5 are concrete walls.

前記無線セキュリティルーム１０は、部屋の壁１１、天井１２、床１３の各部位を導電性があり、かつ汎用性がある一般の建材を使用して構成している。しかも、この建材を繋ぎ目や目地部、開口部などの特殊処理を行わずに使用する。   In the wireless security room 10, each part of the room wall 11, the ceiling 12, and the floor 13 is configured using general building materials that are conductive and versatile. Moreover, this building material is used without performing special processing such as joints, joints, and openings.

一般建材としては、例えば、壁１１、天井１２には防湿対策用プラスタボードを使用し、床１３には金属板裏打ちＯＡフロアパネルを使用している。なお、ＯＡフロアパネルとしては金属板を裏打ちしたもの以外に、例えば導電性の繊維材料を練り込んだものであってもよい。   As a general building material, for example, a plaster board for preventing moisture is used for the wall 11 and the ceiling 12, and a metal plate-lined OA floor panel is used for the floor 13. In addition, as an OA floor panel, the thing which knead | mixed the conductive fiber material other than what backed the metal plate, for example may be used.

前記無線セキュリティルーム１０の中央部には台である机１４を配置している。そして、前記机１４の上に無線基地局１５とこの基地局１５にアンテナとして接続した漏洩伝送路１６とこの漏洩伝送路１６の終端に接続した終端器１７を配置している。前記机１４の上には無線通信端末１８が載置され、オペレータがこの無線通信端末１８を操作することで前記無線基地局１５と漏洩伝送路１６を介して無線通信を行うことになる。このように、前記無線基地局１５、漏洩伝送路１６、終端器１７及び無線通信端末１８は無線通信システムを構築している。   A desk 14 as a table is arranged in the center of the wireless security room 10. A radio base station 15, a leaky transmission line 16 connected to the base station 15 as an antenna, and a terminator 17 connected to the end of the leaky transmission line 16 are arranged on the desk 14. A radio communication terminal 18 is placed on the desk 14, and an operator operates the radio communication terminal 18 to perform radio communication with the radio base station 15 via the leaky transmission path 16. Thus, the wireless base station 15, the leaky transmission path 16, the terminator 17 and the wireless communication terminal 18 constitute a wireless communication system.

このような構成の無線セキュリティルーム１０では無線通信端末１８は漏洩伝送路１６を介して無線基地局１５と無線通信を行う。この場合、漏洩伝送路１６からの電波は従来のホイップアンテナ等に比べて弱く受信できる距離は短い。しかも、壁１１、天井１２、床１３が導電性の建材で構成されているので、遮蔽効果により電波は遮蔽される。従って、無線セキュリティルーム１０の漏洩伝送路１６からの電波が壁１１を通して隣の部屋にある無線通信端末１９に受信されることはない。   In the wireless security room 10 having such a configuration, the wireless communication terminal 18 performs wireless communication with the wireless base station 15 via the leaky transmission path 16. In this case, the radio wave from the leaky transmission path 16 is weaker than the conventional whip antenna or the like and can be received. Moreover, since the wall 11, the ceiling 12, and the floor 13 are made of conductive building materials, the radio waves are shielded by the shielding effect. Therefore, radio waves from the leaky transmission path 16 of the wireless security room 10 are not received by the wireless communication terminal 19 in the adjacent room through the wall 11.

また、壁１１、天井１２、床１３の各部位は導電性がある一般の建材を使用して構成され、しかも、繋ぎ目や目地部、開口部などの特殊処理を行わずに使用できるので、施工が容易にでき、かつ低コストとなる。これにより、無線セキュリティルーム１０を簡単にかつ安価に構築することができる。また、この無線セキュリティルーム１０は導電性の一般建材を使用してシールドを行っているので、従来の電磁遮蔽材のような強力な電波遮蔽能力は無く、強い電波を完全に遮蔽することは無い。従って、室内での携帯電話などの通信機器の使用は可能である。   In addition, each part of the wall 11, the ceiling 12, and the floor 13 is configured by using general conductive materials having conductivity, and can be used without performing special processing such as joints, joints, and openings. Construction is easy and the cost is low. Thereby, the wireless security room 10 can be constructed easily and inexpensively. Further, since this wireless security room 10 is shielded by using conductive general building materials, there is no strong radio wave shielding ability like conventional electromagnetic shielding materials, and strong radio waves are not completely shielded. . Therefore, it is possible to use a communication device such as a mobile phone indoors.

次に、導電性の一般建材を使用してシールドを施した部屋とシールドを施さず下地だけの部屋の内側と外側との間で行った通信実験について述べる。
先ず、シールドを施した部屋、すなわち、無線セキュリティルーム１０の構成について述べる。図３及び図４に示すように、この無線セキュリティルーム１０は、壁１１、天井１２、床１３のほか、ドア２０、窓２１がある。なお、図４は図３において矢印Ａ方向から見た断面図である。 Next, a communication experiment performed between the inside and outside of a room that is shielded using a general conductive building material and a room that is not shielded but only the base is described.
First, the configuration of the shielded room, that is, the wireless security room 10 will be described. As shown in FIGS. 3 and 4, the wireless security room 10 includes a wall 11, a ceiling 12, a floor 13, a door 20, and a window 21. 4 is a cross-sectional view seen from the direction of arrow A in FIG.

前記ドア２０としては導電性の一般建材としてスチールドアを使用している。また、前記窓２１としては金属性の窓枠に導電性の一般建材として熱線反射フィルム付きガラスを使用している。前記壁１１、天井１２は防湿対策用プラスタボードを使用し、床１３は金属板裏打ちＯＡフロアパネルを使用している。前記ドア２０及び窓２１には繋ぎ目や目地部、開口部などを塞ぐような特殊処理を施していない。机１４の上に載置されている無線基地局１５はサーバ２２に接続している。   As the door 20, a steel door is used as a conductive general building material. Moreover, as the said window 21, the glass with a heat ray reflective film is used for the metallic window frame as a conductive general building material. The wall 11 and the ceiling 12 use a moisture-proof plaster board, and the floor 13 uses a metal plate-backed OA floor panel. The door 20 and the window 21 are not subjected to special processing for closing the joints, joints, openings, and the like. The radio base station 15 placed on the desk 14 is connected to the server 22.

この無線セキュリティルーム１０に配置している漏洩伝送路１６は、例えば、全長が３ｍの漏洩同軸ケーブからなり、結合損失が８０ｄＢ、伝送損失が０．１９ｄＢ／ｍのものを使用している。   The leaky transmission line 16 disposed in the wireless security room 10 is formed of a leaky coaxial cable having a total length of 3 m, for example, having a coupling loss of 80 dB and a transmission loss of 0.19 dB / m.

このような環境下において、通信する電波として２．４ＧＨz帯を使用し、ＩＥＥＥ８０２．１１ｇの規格を用いて無線通信を行った。無線通信は、セキュリティルーム内の基地局１５と、セキュリティルーム外の無線通信端末２３との間で行い、セキュリティルームの外側の壁から１ｍ離れた２８箇所の測定ポイントに無線通信端末を移動させ、その地点でのスループットを測定した。   Under such an environment, the 2.4 GHz band was used as a radio wave for communication, and wireless communication was performed using the IEEE 802.11g standard. Wireless communication is performed between the base station 15 in the security room and the wireless communication terminal 23 outside the security room, and the wireless communication terminal is moved to 28 measurement points 1 m away from the outer wall of the security room, The throughput at that point was measured.

その結果、図５の(a)に示すようにアップロードのときも、図５の(b)に示すようにダウンロードのときも、無線セキュリティルーム１０の外に配置されている無線通信端末２３はサーバ２２と無線リンクを確立することができなかった。これは、無線セキュリティルーム１０に配置した漏洩同軸ケーブ１６は従来のホイップアンテナ等に比べて電波が弱く、しかも、導電性の建材を使用した壁１１、天井１２、床１３、ドア２０、窓２１で大きく減衰したことによる。   As a result, the wireless communication terminal 23 arranged outside the wireless security room 10 is a server during uploading as shown in FIG. 5A and downloading as shown in FIG. 22 could not establish a wireless link. This is because the leaky coaxial cable 16 arranged in the wireless security room 10 has weaker radio waves than conventional whip antennas and the like, and the wall 11, ceiling 12, floor 13, door 20, window 21 using conductive building materials. It is because it was greatly attenuated.

これに対し、壁１１、天井１２、床１３、ドア２０、窓２１に導電性の建材を全く使用しない下地だけの部屋では、漏洩同軸ケーブル１６からの電波が弱くても壁、天井,床等で減衰することは無く、部屋の外側周辺まで届くことになる。このため、図６の(a)に示すようにアップロードのときも、図６の(b)に示すようにダウンロードのときも、無線リンクが確立されて高いスループットを得る。すなわち、外部から、無線基地局１５に対して簡単にアクセスが可能になる。   On the other hand, in a room with only a base that does not use conductive building materials for the wall 11, ceiling 12, floor 13, door 20, window 21 at all, even if the radio wave from the leaky coaxial cable 16 is weak, the wall, ceiling, floor, etc. It will not decay and will reach the outside periphery of the room. For this reason, a radio link is established and high throughput is obtained both when uploading as shown in FIG. 6A and when downloading as shown in FIG. 6B. That is, the radio base station 15 can be easily accessed from the outside.

このように、無線基地局１５のアンテナとして漏洩伝送路１６を使用し、部屋の壁１１、天井１２、床１３、ドア２０、窓２１に導電性の一般建材を使用することで、部屋を無線セキュリティルーム１０として構築でき、室内では良好な通信環境を保ちつつ、室外からは無線基地局１５と通信できない状況を実現することができる。また、一般建材を使用しているので材料費を抑えることができる。さらに、繋ぎ目や目地部、開口部などに対して特殊処理を施す必要が無く、施工管理が容易になる。従って、専門の業者が不要になり、通常の施工と同様に扱うことができ、施工費も抑えることができる。   In this way, the leakage transmission path 16 is used as the antenna of the radio base station 15, and the room is wirelessly used by using conductive general building materials for the wall 11, ceiling 12, floor 13, door 20, and window 21 of the room. The security room 10 can be constructed, and a situation in which communication with the radio base station 15 cannot be performed from outside can be realized while maintaining a good communication environment indoors. Moreover, since general building materials are used, material costs can be reduced. Furthermore, it is not necessary to perform special processing on joints, joints, openings, and the like, and construction management becomes easy. Therefore, a specialized trader is not required, it can be handled in the same way as normal construction, and construction costs can be reduced.

次に、前記無線セキュリティルーム１０においてシールド性能を測定した結果について述べる。
図７に示すように無線セキュリティルーム１０内に５ヶ所の測定点１〜５を決め、それぞれ測定点１〜５において送信アンテナＡＴ1，ＡＴ2，ＡＴ3，ＡＴ4，ＡＴ5を部屋内に配置するとともにこれに対向して部屋外に受信アンテナＡＴ11，ＡＴ12，ＡＴ13，ＡＴ14，ＡＴ15を配置し、各送信アンテナＡＴ1〜ＡＴ5から１〜８ＧＨz帯の電波を送信し、これを各受信アンテナＡＴ11〜ＡＴ15で受信してシールド性能を測定した。この測定によって得た１〜８ＧＨzの周波数に対するシールド値の変化を図８に示す。 Next, the result of measuring the shielding performance in the wireless security room 10 will be described.
As shown in FIG. 7, five measurement points 1 to 5 are determined in the wireless security room 10, and transmission antennas AT1, AT2, AT3, AT4, and AT5 are arranged in the room at the measurement points 1 to 5, respectively. The receiving antennas AT11, AT12, AT13, AT14, and AT15 are arranged opposite to each other, and radio waves of 1 to 8 GHz band are transmitted from the transmitting antennas AT1 to AT5, which are received by the receiving antennas AT11 to AT15. The shielding performance was measured. FIG. 8 shows the change of the shield value with respect to the frequency of 1 to 8 GHz obtained by this measurement.

測定点１の送信アンテナＡＴ1からの電波を、壁１１を介して室外の受信アンテナＡＴ11で受信した測定では１〜８ＧＨzの周波数に対して図８の(a)に示すようなシールド値が得られた。また、測定点２の送信アンテナＡＴ2からの電波を、壁１１を介して室外の受信アンテナＡＴ12で受信した測定では１〜８ＧＨzの周波数に対して図８の(b)に示すようなシールド値が得られた。また、測定点３の送信アンテナＡＴ3からの電波を、ドア２０を介して室外の受信アンテナＡＴ13で受信した測定では１〜８ＧＨzの周波数に対して図８の(c)に示すようなシールド値が得られた。また、測定点４の送信アンテナＡＴ4からの電波を、壁１１を介して室外の受信アンテナＡＴ14で受信した測定では１〜８ＧＨzの周波数に対して図８の(d)に示すようなシールド値が得られた。また、測定点５の送信アンテナＡＴ5からの電波を、窓２１を介して室外の受信アンテナＡＴ15で受信した測定では１〜８ＧＨzの周波数に対して図８の(e)に示すようなシールド値が得られた。   In the measurement in which the radio wave from the transmission antenna AT1 at the measurement point 1 is received by the outdoor reception antenna AT11 through the wall 11, a shield value as shown in FIG. 8A is obtained for a frequency of 1 to 8 GHz. It was. Further, in the measurement in which the radio wave from the transmission antenna AT2 at the measurement point 2 is received by the outdoor reception antenna AT12 through the wall 11, the shield value as shown in FIG. 8B is obtained with respect to the frequency of 1 to 8 GHz. Obtained. Further, in the measurement in which the radio wave from the transmission antenna AT3 at the measurement point 3 is received by the outdoor reception antenna AT13 through the door 20, a shield value as shown in FIG. 8C is obtained for a frequency of 1 to 8 GHz. Obtained. Further, in the measurement in which the radio wave from the transmission antenna AT4 at the measurement point 4 is received by the outdoor reception antenna AT14 through the wall 11, the shield value as shown in FIG. 8 (d) is obtained for the frequency of 1 to 8 GHz. Obtained. Further, in the measurement in which the radio wave from the transmission antenna AT5 at the measurement point 5 is received by the outdoor reception antenna AT15 through the window 21, the shield value as shown in FIG. 8 (e) is obtained for the frequency of 1 to 8 GHz. Obtained.

この結果から、２．４ＧＨz帯付近の電波を通信に使用した場合には、窓２１付近では約１５ｄＢ、ドア２０付近では約２０ｄＢ、壁１１では約３０ｄＢのシールド性能が得られることが分かった。そして、部屋全体における各部位のシールド性能の平均は２５ｄＢ程度であった。   From this result, it was found that when radio waves in the vicinity of the 2.4 GHz band are used for communication, shielding performance of about 15 dB near the window 21, about 20 dB near the door 20, and about 30 dB on the wall 11 can be obtained. And the average shield performance of each part in the whole room was about 25 dB.

このことから、局所的には１５ｄＢのシールド性能であっても部屋全体における各部位のシールド性能の平均が２５ｄＢ以上あれば、アンテナとして漏洩伝送路１６を使用した環境では、外部からのアクセスを防ぐことができて充分なシールド効果を果たすことができ、良好な無線セキュリティルームを構築できることがわかった。   From this, even if the shielding performance is 15 dB locally, if the average shielding performance of each part in the entire room is 25 dB or more, access from the outside is prevented in an environment where the leaky transmission path 16 is used as an antenna. It was found that it was possible to achieve a sufficient shielding effect and to build a good wireless security room.

次に、部屋全体に２５ｄＢのシールドを施した部屋とシールドを施さない部屋のそれぞれにおいて、無線基地局にアンテナとして漏洩同軸ケーブルを使用した場合と通常のホイップアンテナを使用した場合について、部屋３０の内側と外側での無線リンク速度の分布がどのようになるかについて述べる。   Next, in each of the room with the shield of 25 dB and the room without the shield in the whole room, the case of using the leaky coaxial cable as the antenna and the case of using the normal whip antenna in the radio base station The distribution of the radio link speed inside and outside will be described.

部屋の大きさは３ｍ×１０ｍとし、部屋に設置する無線基地局にはＩＥＥＥ８０２．１１ｇの規格の基地局を使用する。基地局の送信出力は１０ｍＷ（１０ｄＢｍ）とする。また、漏洩同軸ケーブルは結合損失（漏洩伝送路３２から１．５ｍ地点の損失）が８０ｄＢの漏洩同軸ケーブルを使用する。更に、受信側には０ｄＢｉのアンテナを用いる。   The size of the room is 3 m × 10 m, and the base station of the IEEE802.11g standard is used as the radio base station installed in the room. The transmission output of the base station is 10 mW (10 dBm). The leaky coaxial cable uses a leaky coaxial cable with a coupling loss (loss at 1.5 m from the leaky transmission path 32) of 80 dB. Furthermore, an antenna of 0 dBi is used on the receiving side.

無線基地局のアンテナに２．１４ｄＢｉのホイップアンテナを使用した場合における基地局３１からｄ（ｍ）離れた地点での受信電力Ｅ（ｄＢｍ）は、送信パワーＰ（ｄＢｍ）、アンテナ利得Ｇ（ｄＢｉ）、周波数ｆ（ＭＨz）とすると、
Ｅ＝Ｐ＋Ｇ−Γｆｓ＝Ｐ＋Ｇ−［２７．５５２＋２０×Log(d)＋２０×Log(f)］ …(1)
但し、Γｆｓは自由空間損失（ｄＢ）
で表される。 When a 2.14 dBi whip antenna is used as the antenna of the radio base station, the received power E (dBm) at a point d (m) away from the base station 31 is the transmission power P (dBm) and the antenna gain G (dBi ) And frequency f (MHz),
E = P + G−Γ fs = P + G− [27.552 + 20 × Log (d) + 20 × Log (f)] (1)
Where Γ fs is free space loss (dB)
It is represented by

従って、シールド性能を施さない部屋３０の中央にホイップアンテナを使用した無線基地局３１を配置した場合には、基地局３１から７ｍの地点での受信電力が−４５ｄＢｍとなり、図９に示すように、部屋３０の外側の基地局３１から７ｍの地点でもＩＥＥ８０２．１１ｇの規格の最小受信感度値から、４８Ｍｂｐｓ以上の無線リンクが確立できる。   Therefore, when the radio base station 31 using the whip antenna is arranged in the center of the room 30 where the shielding performance is not applied, the received power at a point 7 m from the base station 31 is −45 dBm, as shown in FIG. Even at a point 7 m from the base station 31 outside the room 30, a wireless link of 48 Mbps or more can be established from the minimum reception sensitivity value of the IEEE802.11g standard.

また、部屋全体に２５ｄＢのシールド性能を施した部屋４０の中央にホイップアンテナを使用した無線基地局３１を配置した場合には、図１０に示すように、部屋４０内では４８Ｍｂｐｓ以上の無線リンクが確立される。また、基地局３１から４．５ｍ離れた部屋の外の地点では受信電力が−６６ｄＢｍとなり、４８Ｍｂｐｓ以上の無線リンクが確立される。また、基地局３１から７ｍ離れた部屋の外の地点では受信電力が−７０ｄＢｍとなり、基地局３１から４．５ｍ〜７ｍ離れた範囲でも３６Ｍｂｐｓの無線リンクが確立できる。   In addition, when the wireless base station 31 using a whip antenna is arranged in the center of the room 40 having a shield performance of 25 dB for the entire room, a wireless link of 48 Mbps or more is provided in the room 40 as shown in FIG. Established. Further, at a point outside the room 4.5 m away from the base station 31, the received power is -66 dBm, and a radio link of 48 Mbps or higher is established. Further, the received power is -70 dBm at a point outside the room 7 m away from the base station 31, and a 36 Mbps wireless link can be established even in a range 4.5 m to 7 m away from the base station 31.

これに対し、無線基地局のアンテナに漏洩同軸ケーブルを使用した場合、漏洩同軸ケーブルからｄ（ｍ）離れた地点での受信電力Ｅ（ｄＢｍ）は、送信パワーＰ（ｄＢｍ）、アンテナと漏洩同軸ケーブ間の結合損失Ｌc（ｄＢ）とすると、
Ｅ＝Ｐ−Ｌｃ＝Ｐ−［Ｌｃｏ＋１０×Log(d／1.5)］ …(2)
但し、Ｌｃｏはアンテナと漏洩同軸ケーブ間が１．５ｍの場合の結合損失Ｌc（ｄＢ）
で表される。 On the other hand, when a leaky coaxial cable is used for the antenna of the radio base station, the received power E (dBm) at a point d (m) away from the leaky coaxial cable is the transmission power P (dBm), the antenna and the leaky coaxial cable. If the coupling loss Lc (dB) between the cables is
E = P−L c = P− [L co + 10 × Log (d / 1.5)] (2)
Where L co is the coupling loss L c (dB) when the distance between the antenna and the leaky coaxial cable is 1.5 m.
It is represented by

従って、シールド性能を施さない部屋３０の中央にアンテナとして漏洩同軸ケーブル３２を使用した無線基地局３１を配置した場合には、図１１に示すように、漏洩同軸ケーブル３２から１．５ｍ離れた地点での受信電力は−７０ｄＢｍとなり、ＩＥＥＥ８０２．１１ｇの規格の最小受信感度値から、３６Ｍｂｐｓ以上の無線リンクが確立できる。また、漏洩同軸ケーブル３２から３ｍ離れた部屋の外の地点では受信電力が−７３ｄＢｍとなる。すなわち、漏洩同軸ケーブル３２から１．５ｍ〜３ｍ離れた範囲では２４Ｍｂｐｓの無線リンクが確立できる。   Therefore, when the radio base station 31 using the leaky coaxial cable 32 as an antenna is arranged in the center of the room 30 where the shielding performance is not provided, a point 1.5 m away from the leaky coaxial cable 32 as shown in FIG. The reception power at −70 dBm becomes −70 dBm, and a wireless link of 36 Mbps or more can be established from the minimum reception sensitivity value of the IEEE802.11g standard. Also, the received power is -73 dBm at a point outside the room 3 m away from the leaky coaxial cable 32. That is, a wireless link of 24 Mbps can be established in a range 1.5 m to 3 m away from the leaky coaxial cable 32.

また、部屋全体に２５ｄＢのシールド性能を施した部屋４０の中央に漏洩同軸ケーブル３２を使用した無線基地局３１を配置した場合には、図１２に示すように、部屋４０内では３６Ｍｂｐｓ以上の無線リンク速度を得ることができる。しかし、部屋４０の外では、２５ｄＢのシールド効果によってとの位置であっても−９５ｄＢｍ以下の受信電力となり、無線リンクを確立することはできない。すなわち、部屋４０の外側の領域を全て通信不能エリアにできることが分かる。   Further, when the radio base station 31 using the leaky coaxial cable 32 is arranged in the center of the room 40 having a shield performance of 25 dB over the entire room, as shown in FIG. Link speed can be obtained. However, outside the room 40, even if it is at a position of 25 dB due to the shielding effect, the received power becomes −95 dBm or less, and a radio link cannot be established. That is, it can be seen that the entire area outside the room 40 can be made into an incommunicable area.

このように、基地局のアンテナとして漏洩同軸ケーブルを使用し、かつ部屋全体を構成する各部位のシールド性能の平均が２５ｄＢ以上になっていれば、部屋内では良好な通信環境を保ち、かつ、外部からは部屋内の無線基地局３１に対してはアクセスできない環境を構築することができる。   In this way, if a leaky coaxial cable is used as the antenna of the base station and the average shielding performance of each part constituting the entire room is 25 dB or more, a good communication environment is maintained in the room, and It is possible to construct an environment in which the wireless base station 31 in the room cannot be accessed from the outside.

なお、ここでは、部屋を構成している壁１１、天井１２、床１３、ドア２０、窓２１の全てに導電性の建材を使用した場合を例として述べたが必ずしも部屋を構成している各部位の全てを導電性の建材で構成する必要はない。例えば、図１３に示すように、上下階を仕切るコンクリート１，２にさらに金属プレート６，７が隙間無く張られている建物の場合には、天井や床に導電性の建材を使用する必要は無く、壁１１、ドア、窓のみを導電性の建材で構成すればよい。   Here, the case where conductive building materials are used for all of the wall 11, ceiling 12, floor 13, door 20, and window 21 constituting the room has been described as an example, but each of the rooms constituting the room is not necessarily limited. It is not necessary to configure all the parts with conductive building materials. For example, as shown in FIG. 13, in the case of a building in which metal plates 6 and 7 are further stretched without gaps on the concrete 1 and 2 that partition the upper and lower floors, it is necessary to use conductive building materials for the ceiling and floor. It is sufficient that only the wall 11, the door, and the window are made of conductive building materials.

また、部屋内で用いる漏洩伝送路は部屋の大きさに合った漏洩伝送路を用いる。例えば、図１１に示すように部屋の大きさが３ｍ×１０ｍの時には８０ｄＢの結合損失の漏洩伝送路を用いることで部屋内では良好な通信環境を保ち、かつ、外部からは部屋内の無線基地局に対してはアクセスできない環境を構築することができる。部屋の大きさが１０ｍ×２０ｍの時には７５ｄＢの結合損失の漏洩伝送路を用いることで、同様の環境を構築することができる。   Moreover, the leaky transmission line used in the room uses a leaky transmission line suitable for the size of the room. For example, as shown in FIG. 11, when a room size is 3 m × 10 m, a leaky transmission path with a coupling loss of 80 dB is used to maintain a good communication environment in the room, and from the outside, a wireless base in the room It is possible to construct an environment inaccessible to the station. When the size of the room is 10 m × 20 m, a similar environment can be constructed by using a leaky transmission path with a coupling loss of 75 dB.

なお、部屋の大きさに合わせて漏洩伝送路を選択するだけではなく、部屋の大きさに合わせて漏洩伝送路に供給する送信電力を調整しても良い。
漏洩伝送路に供給する送信電力を調整する送信電力調整手段としては、無線基地局に備えられている送信電力調整手段を用いる、あるいは、送信電力が異なる複数の無線基地局の中から用いる無線基地局を選択する、あるいは、無線基地局と漏洩伝送路の間に減衰器を挿入して送信出力を調整する手段がある。 In addition to selecting the leaky transmission path according to the size of the room, the transmission power supplied to the leaky transmission path may be adjusted according to the size of the room.
As the transmission power adjustment means for adjusting the transmission power supplied to the leaky transmission path, the transmission power adjustment means provided in the wireless base station, or a wireless base used from a plurality of wireless base stations having different transmission power There is a means for adjusting a transmission output by selecting a station or inserting an attenuator between a radio base station and a leaky transmission line.

このような送信電力調整手段を用い、例えば、図１１に示すように３ｍ×１０ｍの大きさの部屋に結合損失が８０ｄＢの漏洩伝送路を用いた場合には、漏洩伝送路に供給する送信電力を１０ｍＷ（１０ｄＢｍ）にして用いるが、１０ｍ×２０ｍの大きさの部屋に結合損失が８０ｄＢの漏洩伝送路を用いた場合には、漏洩伝送路に供給する送信電力を送信電力を３１．６２ｍＷ（１５ｄＢｍ）にして用いる。このような構成によっても、部屋内では良好な通信環境を保ち、かつ、外部からは部屋内の無線基地局に対してはアクセスできない環境を構築することができる。   When such a transmission power adjusting means is used and, for example, a leaky transmission line having a coupling loss of 80 dB is used in a room of 3 m × 10 m as shown in FIG. 11, the transmission power supplied to the leaky transmission line Is set to 10 mW (10 dBm), but when a leaky transmission line with a coupling loss of 80 dB is used in a 10 m × 20 m room, the transmission power supplied to the leaky transmission line is 31.62 mW ( 15 dBm). Even with such a configuration, it is possible to build an environment in which a good communication environment is maintained in the room and the wireless base station in the room cannot be accessed from the outside.

次に、無線セキュリティルームにおける漏洩伝送路の配置の他の例について述べる。この実施の形態では机の上に基地局と漏洩伝送路を配置したが、例えば、図１４に示すように、机４１の中央部分に溝からなる電気配線用ダクト４２を形成し、この電気配線用ダクト４２内に漏洩伝送路４３を配置し、終端に終端器４４を接続する。漏洩伝送路４３の始端は同軸ケーブ４５を介して床に配置した無線基地局４６に接続する。   Next, another example of the arrangement of leaky transmission paths in the wireless security room will be described. In this embodiment, the base station and the leaky transmission line are arranged on the desk. For example, as shown in FIG. A leakage transmission path 43 is arranged in the duct 42 and a terminator 44 is connected to the end. The starting end of the leaky transmission line 43 is connected to a radio base station 46 disposed on the floor via a coaxial cable 45.

このように漏洩伝送路４３を配置することで、漏洩伝送路４３は机４１の上に露出した状態で配置されることは無く、すっきりとして配置ができる。従って、通信端末装置４７を机４１の上に載せて操作するオペレータにとっては作業がし易い環境となる。
なお、漏洩伝送路４３の配置としては、その他、机４１の裏側に配置しても、あるいは、床上に配置しても、さらには、天井につるすように配置することもできる。 By arranging the leaky transmission line 43 in this way, the leaky transmission line 43 is not arranged in a state of being exposed on the desk 41, and can be arranged neatly. Therefore, it becomes an environment where it is easy for an operator who places and operates the communication terminal device 47 on the desk 41.
In addition, as the arrangement of the leaky transmission line 43, it may be arranged on the back side of the desk 41, on the floor, or further on the ceiling.

次に無線セキュリティルームの形状とそれに応じた漏洩伝送路の配置の各種例について述べる。
無線セキュリティルームの周囲の壁、天井及び床には汎用性の有る導電性の一般建材を使用するため、部屋を建築のプランに合わせた形状に構築することができる。そして、漏洩伝送路は伝送路に沿って通信エリアを構成するため、構築された無線セキュリティルームの形状に合わせて配置することが望ましい。 Next, various examples of the shape of the wireless security room and the arrangement of leaky transmission paths corresponding to the shape will be described.
Since general-purpose conductive general building materials are used for the surrounding walls, ceiling, and floor of the wireless security room, the room can be constructed in a shape that matches the architectural plan. And since a leaky transmission line comprises a communication area along a transmission line, it is desirable to arrange | position according to the shape of the constructed | assembled wireless security room.

例えば、図１５に示すように、部屋の周囲の壁、天井、床、ドア、窓等を導電性の建材で構成してＬ字形の無線セキュリティルーム５１を構築した場合には、この形状に合わせて漏洩伝送路６１もＬ字に配置する。漏洩伝送路６１の始端を無線基地局７１に接続し、終端を終端器７２に接続する。
また、図１６に示すように、中央に吹き抜けやアトリウムなどの空間５２がある部屋に対して周囲の壁、天井、床、ドア、窓等を導電性の建材で構成して無線セキュリティルーム５３を構築した場合には、この形状に合わせて２本のＬ字形の漏洩伝送路６２，６３を配置する。すなわち、１本目の漏洩伝送路６２を部屋の一方のＬ字部に配置し、その始端を無線基地局７３に接続し、その終端を終端器７４に接続する。また、２本目の漏洩伝送路６３を部屋のもう一方のＬ字部に配置し、その始端を無線基地局７５に接続し、その終端を終端器７６に接続する。 For example, as shown in FIG. 15, in the case where an L-shaped wireless security room 51 is constructed by configuring the walls, ceilings, floors, doors, windows, etc. around the room with conductive building materials, this shape is adjusted. The leakage transmission path 61 is also arranged in an L shape. The start end of the leaky transmission path 61 is connected to the radio base station 71, and the end is connected to the terminator 72.
In addition, as shown in FIG. 16, the surrounding wall, ceiling, floor, door, window, and the like are made of conductive building materials for a room having a space 52 such as an atrium or an atrium in the center, and a wireless security room 53 is formed. When constructed, two L-shaped leaky transmission lines 62 and 63 are arranged in accordance with this shape. That is, the first leaky transmission path 62 is arranged in one L-shaped part of the room, its start end is connected to the radio base station 73, and its end is connected to the terminator 74. Also, the second leaky transmission line 63 is arranged in the other L-shaped part of the room, its start end is connected to the radio base station 75, and its end is connected to the terminator 76.

また、図１７に示すように、隣接する小会議室やテナントが多数存在する場合には、各部屋の周囲の壁、天井、床、ドア、窓等を導電性の建材で構成してそれぞれ無線セキュリティルーム５４，５５，５６を構築する。そして、部屋毎に漏洩伝送路６４，６５，６６を配置し、各漏洩伝送路６４，６５，６６の始端を無線基地局７７，７８，７９にそれぞれ接続し、終端を終端器８０，８１，８２にそれぞれ接続する。
このように、無線セキュリティルームの形状に合わせて漏洩伝送路を配置すればよい。 As shown in FIG. 17, when there are a large number of adjacent small conference rooms and tenants, the walls, ceilings, floors, doors, windows, etc. around each room are composed of conductive building materials, and each is wireless. Security rooms 54, 55 and 56 are constructed. Leakage transmission paths 64, 65, 66 are arranged for each room, the start ends of the respective leaky transmission paths 64, 65, 66 are connected to the radio base stations 77, 78, 79, respectively, and the terminations are terminated by the terminators 80, 81, 82, respectively.
In this manner, the leaky transmission path may be arranged in accordance with the shape of the wireless security room.

本発明の実施の形態に係る無線セキュリティルームの構成を示す側面から見た断面図。Sectional drawing seen from the side which shows the structure of the wireless security room which concerns on embodiment of this invention. 同実施の形態に係る無線セキュリティルームの構成を示す上面から見た断面図。Sectional drawing seen from the upper surface which shows the structure of the wireless security room which concerns on the embodiment. 同実施の形態において通信実験に使用した無線セキュリティルームの構成を示す上面から見た断面図。Sectional drawing seen from the upper surface which shows the structure of the wireless security room used for the communication experiment in the embodiment. 図３の無線セキュリティルームを矢印Ａ方向から見た断面図。Sectional drawing which looked at the wireless security room of FIG. 3 from the arrow A direction. 図３の無線セキュリティルームにおいて漏洩伝送路をアンテナに使用して通信を行った場合の部屋の内と外と間の無線リンク確立状態を示す図で、(a)はアップロードの場合を示す図、(b)はダウンロードの場合を示す図。FIG. 4 is a diagram showing a wireless link establishment state between inside and outside of a room when communication is performed using a leaky transmission path as an antenna in the wireless security room of FIG. 3, (a) is a diagram showing a case of upload; (b) is a diagram showing a case of downloading. 導電性の建材を全く使用しない下地だけの部屋において漏洩伝送路をアンテナに使用して通信を行った場合の部屋の内と外と間の無線リンク確立状態を示す図で、(a)はアップロードの場合を示す図、(b)はダウンロードの場合を示す図。The figure shows the wireless link establishment state between the inside and outside of the room when communicating using the leaky transmission path as an antenna in a ground-only room that does not use conductive building materials at all, (a) is an upload The figure which shows the case of (b), The figure which shows the case of download. 無線セキュリティルームにおいてシールド性能を測定したときの測定点を示す図。The figure which shows the measurement point when shielding performance is measured in a wireless security room. 図７の各測定点において測定した、周波数１〜８ＧＨzに対するシールド値の変化を示すグラフ。The graph which shows the change of the shield value with respect to the frequency of 1-8 GHz measured in each measurement point of FIG. シールドを施さない部屋において通常のホイップアンテナを使用した場合の無線リンク速度の分布を示す図。The figure which shows distribution of the radio link speed at the time of using a normal whip antenna in the room which does not give a shield. 部屋全体に２５ｄＢのシールドを施した部屋において通常のホイップアンテナを使用した場合の無線リンク速度の分布を示す図。The figure which shows distribution of the radio link speed at the time of using a normal whip antenna in the room which gave the shield of 25 dB to the whole room. シールドを施さない部屋において漏洩同軸ケーブルのアンテナを使用した場合の無線リンク速度の分布を示す図。The figure which shows distribution of the radio link speed at the time of using the antenna of a leaky coaxial cable in the room which does not give a shield. 部屋全体に２５ｄＢのシールドを施した部屋において漏洩同軸ケーブルのアンテナを使用した場合の無線リンク速度の分布を示す図。The figure which shows distribution of the radio link speed at the time of using the antenna of a leaky coaxial cable in the room which gave the shield of 25 dB to the whole room. 無線セキュリティルームの他の構成例を示す側面から見た断面図。Sectional drawing seen from the side which shows the other structural example of a wireless security room. 無線セキュリティルーム内において机の上に漏洩伝送路を配置するときの他の例を示す図。The figure which shows the other example when arrange | positioning a leaky transmission path on a desk in a wireless security room. 無線セキュリティルームの他の形状例とその形状に応じた漏洩伝送路の配置例を示す断面図。Sectional drawing which shows the other example of a shape of a wireless security room, and the example of arrangement | positioning of the leakage transmission path according to the shape. 無線セキュリティルームの他の形状例とその形状に応じた漏洩伝送路の配置例を示す断面図。Sectional drawing which shows the other example of a shape of a wireless security room, and the example of arrangement | positioning of the leakage transmission path according to the shape. 無線セキュリティルームの他の形状例とその形状に応じた漏洩伝送路の配置例を示す断面図。Sectional drawing which shows the other example of a shape of a wireless security room, and the example of arrangement | positioning of the leakage transmission path according to the shape.

符号の説明Explanation of symbols

１０…無線セキュリティルーム、１１…壁、１２…天井、１３…床、１５…無線基地局、１６…漏洩伝送路、１８…無線通信端末。   DESCRIPTION OF SYMBOLS 10 ... Wireless security room, 11 ... Wall, 12 ... Ceiling, 13 ... Floor, 15 ... Wireless base station, 16 ... Leakage transmission path, 18 ... Wireless communication terminal.

Claims (4)

無線基地局のアンテナを構成する漏洩伝送路を敷設する部屋であって、前記部屋は、壁、天井、床、ドア、窓等の各部位の１又は複数箇所に導電性の建材を使用し、局所的なシールド性能が１５ｄＢ以上で、かつ、全体における各部位のシールド性能の平均が２５ｄＢ以上に設定したことを特徴とする無線セキュリティルーム。   A room laying a leaky transmission path constituting an antenna of a radio base station, wherein the room uses a conductive building material in one or a plurality of parts such as a wall, a ceiling, a floor, a door, and a window, A wireless security room characterized in that the local shielding performance is 15 dB or more, and the average shielding performance of each part in the whole is set to 25 dB or more. 導電性の建材として、壁及び天井には防湿対策用プラスタボードを使用し、床には導電性ＯＡフロアパネルを使用し、ドアにはスチールドアを使用し、窓にはウィンドウフィルム付きガラスを使用したことを特徴とする請求項１記載の無線セキュリティルーム。   As conductive building materials, plasterboards for moisture prevention are used for walls and ceilings, conductive OA floor panels are used for floors, steel doors are used for doors, and glass with window film is used for windows. The wireless security room according to claim 1, wherein: 部屋に台を配置し、この台に漏洩伝送路を配置したことを特徴とする請求項１又は２記載の無線セキュリティルーム。   3. The wireless security room according to claim 1, wherein a stand is arranged in the room, and a leaky transmission path is arranged on the stand. 無線基地局のアンテナを構成する漏洩伝送路を敷設する部屋であって、前記部屋は、壁、天井、床、ドア、窓等の各部位の１又は複数箇所に導電性の建材を使用し、局所的なシールド性能が１５ｄＢ以上で、かつ、全体における各部位のシールド性能の平均が２５ｄＢ以上に設定した無線セキュリティルームと、前記漏洩伝送路に供給する送信電力を調整する送信電力調整手段を備えた無線セキュリティシステム。   A room laying a leaky transmission path constituting an antenna of a radio base station, wherein the room uses a conductive building material in one or a plurality of parts such as a wall, a ceiling, a floor, a door, and a window, A wireless security room having a local shielding performance of 15 dB or more and an average shielding performance of each part in the whole being set to 25 dB or more, and transmission power adjusting means for adjusting transmission power supplied to the leaky transmission path are provided. Wireless security system.
JP2005328717A 2005-11-14 2005-11-14 Radio security room and radio security system Pending JP2007134642A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010035122A (en) * 2008-02-29 2010-02-12 Itoki Corp Table
JP2011244194A (en) * 2010-05-18 2011-12-01 Fujikura Ltd Communication system
JP2013031001A (en) * 2011-07-28 2013-02-07 Toshiba Tec Corp Wireless communication system
EP3758243A4 (en) * 2018-02-27 2021-04-07 Mitsubishi Heavy Industries, Ltd. Wireless communication system and flying object

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63128795A (en) * 1986-11-19 1988-06-01 清水建設株式会社 Method of shielding joint part of electromagnetic shielded building struction
JPH05175680A (en) * 1991-12-20 1993-07-13 Asahi Glass Co Ltd Electromagnetic-wave shielding window
JPH0983179A (en) * 1995-09-14 1997-03-28 Shimizu Corp Electromagnetic shielding floor
JPH09148821A (en) * 1995-09-18 1997-06-06 Canon Inc Communication equipment for radio lan
JPH09184374A (en) * 1996-01-08 1997-07-15 Nippon Paint Co Ltd Building with radio communication
JPH1065668A (en) * 1996-08-20 1998-03-06 Nec Corp Radio lan system
JP2004080755A (en) * 2002-07-22 2004-03-11 Ricoh Co Ltd Method for connecting electronic device to network, wireless electronic device and control device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63128795A (en) * 1986-11-19 1988-06-01 清水建設株式会社 Method of shielding joint part of electromagnetic shielded building struction
JPH05175680A (en) * 1991-12-20 1993-07-13 Asahi Glass Co Ltd Electromagnetic-wave shielding window
JPH0983179A (en) * 1995-09-14 1997-03-28 Shimizu Corp Electromagnetic shielding floor
JPH09148821A (en) * 1995-09-18 1997-06-06 Canon Inc Communication equipment for radio lan
JPH09184374A (en) * 1996-01-08 1997-07-15 Nippon Paint Co Ltd Building with radio communication
JPH1065668A (en) * 1996-08-20 1998-03-06 Nec Corp Radio lan system
JP2004080755A (en) * 2002-07-22 2004-03-11 Ricoh Co Ltd Method for connecting electronic device to network, wireless electronic device and control device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010035122A (en) * 2008-02-29 2010-02-12 Itoki Corp Table
JP2011244194A (en) * 2010-05-18 2011-12-01 Fujikura Ltd Communication system
JP2013031001A (en) * 2011-07-28 2013-02-07 Toshiba Tec Corp Wireless communication system
EP3758243A4 (en) * 2018-02-27 2021-04-07 Mitsubishi Heavy Industries, Ltd. Wireless communication system and flying object
US11943006B2 (en) 2018-02-27 2024-03-26 Mitsubishi Heavy Industries, Ltd. Wireless communication system using a leaky transmission line for direct two-way communication and usable in a flying object

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