Radio frequency communication system utilizing radiating transmission lines
First Claim
1. A radio frequency communicating system comprising a first radiating transmission line having a proximate end and a distal end, said first transmission line including a unidirectional amplifier therein for amplifying a radio frequency signal from said proximate end to said distal end of said first transmission line, a second radiating transmission line spaced from said first transmission line having a proximate end and a distal end and substantially coextensive with said first transmission line thereby establishing a given radio frequency coupling loss between said radiating transmission lines, said second transmission line including a unidirectional amplifier therein for amplifying a radio frequency signal from said distal end to said proximate end of said second transmission line, a radio frequency transmitter coupled to at least one of said first and second transmission lines by electromagnetic wave propagation in space and a radio frequency receiver coupled to at least the other of said first and second transmission lines by electromagnetic wave propagation in space;
- said unidirectional amplifiers of said first and second transmission lines having a gain less than the coupling loss between said first and second transmission lines.
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Accused Products
Abstract
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 therein 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 the transmission lines (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.
55 Citations
25 Claims
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1. A radio frequency communicating system comprising a first radiating transmission line having a proximate end and a distal end, said first transmission line including a unidirectional amplifier therein for amplifying a radio frequency signal from said proximate end to said distal end of said first transmission line, a second radiating transmission line spaced from said first transmission line having a proximate end and a distal end and substantially coextensive with said first transmission line thereby establishing a given radio frequency coupling loss between said radiating transmission lines, said second transmission line including a unidirectional amplifier therein for amplifying a radio frequency signal from said distal end to said proximate end of said second transmission line, a radio frequency transmitter coupled to at least one of said first and second transmission lines by electromagnetic wave propagation in space and a radio frequency receiver coupled to at least the other of said first and second transmission lines by electromagnetic wave propagation in space;
- said unidirectional amplifiers of said first and second transmission lines having a gain less than the coupling loss between said first and second transmission lines.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. The method of providing for radio frequency communication in tunnels and the like having a proximate end and a distal end comprising the steps of:
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(a) extending a first radiating transmission line along said tunnel from the proximate end thereof toward the distal end thereof; (b) extending a second radiating transmission line along said tunnel from the proximate end thereof toward the distal end thereof in spaced substantially coextensive relation to said first radiating transmission line thereby establishing a given radio frequency coupling loss between said radiating transmission lines; (c) interposing a first unidirectional amplifier in said first radiating transmission line for amplifying a radio frequency signal in a given frequency range from said proximate end toward said distal end of said tunnel with a gain less than said given coupling loss; and (d) interposing a second unidirectional amplifier in said second radiating transmission line for amplifying a radio frequency signal in said given frequency range from said distal end toward said proximate end of said tunnel with a gain less than said given coupling loss. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. The method of radio frequency communication comprising the steps of:
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(a) amplifying radio frequency signals along a first radiating transmission line in a given direction; (b) amplifying radio frequency signals along a second radiating transmission line spaced from and substantially coextensive with said first radiating transmission line in the direction opposite said given direction; (c) establishing a coupling loss between said first and second radiating transmission lines; (d) limiting the amplification of said radio frequency signals along each of said first and second radiating transmission lines to a value less than said coupling loss; and (e) coupling radio frequency signals to and from said first and second radiating transmission lines by electromagnetic wave propagation in space. - View Dependent Claims (25)
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Specification