H - Electricity – 04 – B
Patent
H - Electricity
04
B
351/23, 325/41
H04B 7/00 (2006.01) H04B 5/00 (2006.01)
Patent
CA 1183220
ABSTRACT OF THE DISCLOSURE A radio communication system for use in tunnels, mines, buildings or other shielded locations in which a pair of radiating transmission lines (30), (31) extend through such location in spaced coextensive relation to each other. Each transmission line (30), (31) has at least one unidirectional amplifier (32), (33) interposed there-in with the sense of the unidirectional amplifier (32) of one transmission line (30) being opposite to the sense of the unidirectional amplifier (33) of the other transmission line (31). Each of the amplifiers (32), (33) has a gain which is less than the coupling loss between tile transmission line (30), (31). Two or more mobile transceivers (35) in the location served by the system are coupled to the transmission lines (30), (31) by electromagnetic wave propagation in space in order to communicate directly with each other at a given radio frequency within the frequency range of the system.
385281
Meredith & Finlayson
The Government Of The United States As Represented By The United
LandOfFree
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