Wireless subterranean signaling method

Details Wireless subterranean signaling method Wireless subterranean signaling method

1974-01-25

1976-06-29

Safourek, Benedict V.

179 82, H04B 1302

Patent

active

039672018

ABSTRACT:
A relatively low frequency wireless electromagnetic communication link is established through a subterranean lossy medium such as ground or water by launching and propagating magnetic waves of generally vertical magnetic polarization through the intervening subterranean region of earth or water between a pair of magnetic dipole antennas. A suitable subterranean dipole magnetic antenna includes an elongated electrical solenoid having a ferromagnetic core, as of ferrite or laminated iron. Relatively low frequency magnetic waves are utilized wherein the frequency is related to the conductivity of the subterranean region and distance between transmitter and receiver such that the range is less than 10 skin depths at the carrier frequency.

REFERENCES:
patent: 2653220 (1953-09-01), Bays
patent: 3333239 (1967-07-01), Silverman
patent: 3495209 (1970-02-01), Engle
Raytheon Electronic Progress: vol. 8, No. 2; Winter 1964; pp. 4-10, "Deep Rock Strata Communication", Debettencourt.

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