| 摘要 |
An antenna (3) of an electromagnetic probe used in investigation of geolo gical formations GF surrounding a borehole WBH comprises a conductive base ( 31) and an antenna element (32). The conductive base (31) comprises an opene d non-resonant cavity (33). The antenna element (32) is embedded in the cavi ty (33) and goes right through the cavity. The antenna element (32) is isola ted from the conductive base (31). The antenna element (32) is coupled to at least one electronic module via a first 34A and a second 34B port, respecti vely. The electronic module operates the antenna so as to define a simultane ously superposed pure magnetic dipole and pure electric dipole.
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