Directional antenna system for use in a borehole incorporating a

Details Directional antenna system for use in a borehole incorporating a Directional antenna system for use in a borehole incorporating a

1984-12-17

1987-08-25

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

343832, 343873, G01V 330, H01Q 330, H01Q 302

Patent

active

046895698

ABSTRACT:
For use in logging a borehole through various formations of the earth, the preferred and illustrated embodiment of an RF transmitter system including antenna placed in the sonde is disclosed. The embodiment sets forth a pair of dipole antennas mounted in a closed chamber on a central support. The chamber is in a cylindrical housing filled with a high dielectric material. The antennas are bowtie dipoles which are fed with separately time delayed pulses (preferably having waveforms of only one cycle) so that the relative time delay between the two antenna inputs and the propagation velocity in the high dielectric medium results in reinforcing addition of the radiated wave in the forward direction and destructive cancellation in the reverse direction to provide a directional azimuthal radiation pattern. The housing is rotated at a slow rate to enable pulses to be transmitted in various directions to map the formations near the borehole.

REFERENCES:
patent: 2255520 (1941-09-01), Schuster
patent: 3286163 (1966-11-01), Holser et al.
patent: 4123759 (1978-10-01), Hines et al.
patent: 4274097 (1981-06-01), Krall et al.
Lytle et al., "Design of a Miniature Directional Antenna for Geophysical Probing from Boreholes", IEEE Transactions on Geoscience Electronics, vol. GE-16, No. 4, Oct. 1978, pp. 304-307.

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