Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space
Patent
1987-09-28
1989-03-21
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Transmission through media other than air or free space
324333, G01S 728
Patent
active
048147680
ABSTRACT:
A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole.
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H. T. Chang et al., "Development of a Borehole Directional Antenna at VHF," Sandia Report SAND84-0254, Mar. 1984.
Blum Theodore M.
Chafin James H.
Gregory Bernarr Earl
Hightower Judson R.
Libman George H.
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