Telecommunications – Transmitter and receiver at separate stations – Earth or water medium
Patent
1979-07-23
1982-12-07
Chin, Tommy P.
Telecommunications
Transmitter and receiver at separate stations
Earth or water medium
34087017, 250265, H04B 1202, H01V 140
Patent
active
043631371
ABSTRACT:
A data communication system has a transmitting antenna (18,19), a source (34) of data to be transmitted, a carrier source (45), and a modulator (41,42,43) located at a first point. The transmitting antenna includes an inductive winding (17) having an electrical length significantly smaller than the wavelength of the carrier. The carrier modulated with the data is applied to the transmitting antenna to generate a magnetic induction field about the first point. A receiving antenna (53,54) is located at a second point remote from the first point. The receiving antenna includes an inductive winding (53) having an electrical length significantly smaller than the wavelength of the carrier. The windings of the transmitting and receiving antennas enclose mutually exclusive regions and are uncoupled magnetically except for the medium between the first and second points. A portion of the field generated by the transmitting antenna is intercepted by the receiving antenna to produce a signal that is demodulated (51) and stored (52).
REFERENCES:
patent: 2647991 (1953-08-01), Tatel
patent: 2840694 (1958-06-01), Morgan
patent: 2931897 (1960-04-01), Tuve
patent: 3008666 (1961-11-01), Kuck
patent: 3541450 (1970-11-01), Paine
patent: 3651405 (1972-03-01), Whitney
patent: 3900878 (1975-08-01), Tsao
patent: 3967201 (1976-06-01), Rorden
patent: 4087781 (1978-05-01), Grossi et al.
patent: 4199026 (1980-04-01), McCollum
Chin Tommy P.
Occidental Research Corporation
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