High-sensitivity subsurface sensing system

Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space

Reexamination Certificate

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Details

C342S075000, C342S098000, C342S192000

Reexamination Certificate

active

07994963

ABSTRACT:
A target is sensed by an antenna array having a transmitter antenna and a receiver antenna, both of which are caused to be electromagnetically coupled to the target. The antenna array is rotated, and as the array rotates, a change in at least one of the coupling between the transmitter antenna and the target and the coupling between the receiver antenna and the target is detected at multiple rotational orientations of the antenna array.

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