Borehole located directional antennae means for electromagnetic sensing systems

摘要

A directional antenna for an electromagnetic sensing system comprises a generally cylindrical tube of electrically-conductive material a portion of the tube being cut away to define a transversally-facing window. The non-cut away portion of the tube provides a backing shield for a pair of antenna elements mounted on a generally 'V'-shaped support. A cover of dielectric material is arranged over the antenna elements.