Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1987-06-10
1989-12-26
Picard, Leo P.
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
343879, 34082572, H05K 900
Patent
active
048899585
ABSTRACT:
A building with an electromagnetic shield structure for individual floors uses an electromagnetic shielding material in a body of the building and in openings such as windows and doorways, and the external wall surface of the building is covered with an electromagnetic shielding layer. An electromagnetically shielded space within the building is divided into individual floors by floor partitions using an electromagnetic shielding material. Wireless communication utilizing electric waves is carried out within the building, with the same frequency band or any desired frequency band being allotted to each floor. With the above arrangement, sets of communications equipment using the same frequency band on one floor can communicate with one another without interfering with sets on another floor, even though the sets of equipment on the other floors use the same frequency band. Accordingly, by installing sets of communications equipment of a fixed frequency band irrespective of the number of floors in the building, information can be communicated freely within the building.
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patent: 4613530 (1986-09-01), Hood et al.
patent: 4639914 (1987-01-01), Winters
patent: 4672658 (1987-06-01), Kavehrad
patent: 4755630 (1988-07-01), Smith et al.
Pahlaran, "Wireless Communications for Office Information Networks", IEEE Communication Magazine, June 1985, vol. 23, No. 6, pp. 19-27.
Brown, "Radiax.TM., A New Slotted Cable for Short Range Radio Communication"; IEEE Int. Conference on Communications, Seattle, Wash. U.S.A., 11-13 June 1973, pp. 52-121.
Ishikawa Toshiuyki
Nagata Koji
Nakamura Masatake
Takahashi Takeshi
Yabana Yoshiji
Picard Leo P.
Shimizu Construction Co. Ltd.
Tone David A.
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