Ultra-high frequency communication installation
US5230080A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Mar 6, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication installation for use in a site having underground galleries, for information exchanges, comprises a repeater connected to a wired distribution network. The repeater is arranged for receiving messages which arrive over the wired network at a first frequency and for retransmitting the messages over the network at a second frequency different from the first frequency. The network comprises non-radiating cable sections, radiating cable sections capable to radiate at the second frequency and to collect radiation energy at the first frequency from a portable emitter-receiver set placed nearby. The network further comprises terminal antennae for emitting at the second frequency and collecting energy at the first frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.