|
|
| |
Radiating Cables |
|
|
|
|
|
| |
For communications between fixed and mobile stations, radio links
are used. The ongoing development of communications increases the
demand for those communications between fixed and mobile stations at
any point, even in tunnels.
 In
tunnels however, the propagation properties of electromagnetic waves
used for mobile communication are very unsatisfactory. Transmission in
tunnels by means of antennas is often difficult, this is why a major
interest in devices such as radiating cables exists.
There is a wide variety of needs for underground radio communications, for instance:
- Mobile communication (GSM, PCN/PCS, DECT...) in building, tunnel or subway.
- Communications in underground areas, like car parks, large buildings, mine tunnels, etc.
- Retransmission of FM-Radio (88-108MHz) in road tunnels
- Relaying radio communications of emergency services in road tunnels -Relaying of radiotelephony in road tunnels
- Communications in underground railways or in railway tunnels
The development of new mobile radio systems requires new radiating
elements allowing the retransmission of the 900 MHz band with an
acceptable attenuation.
Mobile radio communications today show the following trends:
- towards higher frequencies: applications shift from 50-150 MHz to 450-900 MHz and 1800-2200 MHz.
- towards higher quality links: digital transmissions, high bit rates, ...
- towards a denser integration in urban zones and confined areas: tunnels, half-buried motor ways, underground parking lots, etc…
OVERVIEW
Radiating Catalog
4600 Kb
|
|
|
