Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent
1979-03-05
1981-03-31
Safourek, Benedict V.
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
370 75, H04B 7185
Patent
active
042597412
ABSTRACT:
A satellite relay system for Time Division Multiple Access (TDMA) utilizing a beam scanning technique has been found. According to the present invention a plurality of antennas each relating to the corresponding earth station have a narrow spot beam with sharp directivity. Each of the up-link bursts (a signal from an earth station to a satellite) is simply combined, and a single-channel TDMA signal is obtained. Said TDMA signal is then divided into a plurality of signals by a power divider after frequency conversion. Each of said signals is processed by a variable phase shifter, the output of which is applied to a power amplifier. A 2n-port directional coupler having n number of input terminals and n number of output terminals is provided and each of said input terminals is connected to the output of the corresponding power amplifier. Each of the output signals of the 2n-port directional coupler provides a down-link burst and is connected to the corresponding transmission antenna which has a sharp directivity covering only a single specific earth station. The 2n-port directional coupler is composed of a plurality of couplers or hybrid circuits.
REFERENCES:
patent: 3864679 (1975-02-01), Hannan et al.
patent: 3922680 (1975-11-01), Alsberg et al.
patent: 3928804 (1975-12-01), Schmidt et al.
patent: 4090199 (1978-05-01), Archer
patent: 4105973 (1978-08-01), Arnold et al.
patent: 4122453 (1978-10-01), Profera
Nippon Telegraph and Telephone Public Corp.
Safourek Benedict V.
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