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EP0342858A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

System for re-emitting electromagnetic waves received from outside within an electromagnetic shielded space

Assignee: Shimizu Construction Co Ltd
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Filing: 1989-05-10
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Granted: —
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Expires: 2009-05-10
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Abstract

Abstract A system for re-emitting electromagnetic waves within an electromagnetically shielded space (1) and for performing communication between the inside and the outside of the shielded space in a particular frequency band, has a receiver (2,3) for an outside electromagnetic wave, and a transmitter (4,5) for amplifying and thereafter re-emitting the amplified signal within the electromagnetically shielded space (1). A paging system or a mobile radio telephone system using electromagnetic waves can be thereby utilized even in an electromagnetically shielded space (1) where the level of received waves would otherwise be insufficient.

Inventors

  • 👤 Toshiyuki C/O Chimizu Constr. Co. Ltd. Ishikawa
  • 👤 Yoshiji C/O Shimizu Constr. Co. Ltd. Yabana
  • 👤 Takeshi C/0 Shimizu Constr. Co. Ltd. Takahashi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 19:55
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/15507

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 68 words
A system for re-emitting within an electromagneti­cally shielded space (1,11) an extraneous wave in a particular frequency band to perform communication between the inside and the outside of said shielded space, said system comprising: receiving means (2,3) for receiving a signal having a frequency in a particular frequency band from an extraneous electric wave; and transmitting means (4,5) for re-emitting the received signal within said electromagnetically shielded space.
Claim 2
Independent Claim 68 words
A system for re-emitting within an electromagneti­cally shielded space (1,11) an extraneous wave in a particular frequency band to perform communication between the inside and the outside of said shielded space, said system comprising: receiving means (2,3) for receiving a signal having a frequency in a particular frequency band from an extraneous electric wave; and transmitting means (4,5) for re-emitting the received signal within said electromagnetically shielded space.
Claim 3
Dependent Claim 32 words
A system for re-emitting an extraneous wave within an electromagnetically shielded space according to Claim 1, wherein an antenna (2) of said receiving means is disposed outside said electromagnetically shielded space (1).
Claim 4
Dependent Claim 38 words
A system for re-emitting an extraneous wave within an electromagnetically shielded space according to Claim 1, wherein an antenna (2) of said receiving means is disposed by the side of a wall of said electromagneti­cally shielded space (11).
Claim 5
Independent Claim 24 words
A system according to any one of Claims 1-3 wherein said transmitting means (4,5) incorporates means (4) for amplifying the received signal before transmission.

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