Patent ID: 9599741
Date: 2017-03-21
CPC Classifications: G01R,G01V,H01Q

Claim:
1. An antenna of an electromagnetic probe used in investigation of geological formations surrounding a borehole comprising a conductive base and an antenna element, the conductive base comprising an opened non-resonant cavity, the antenna element being embedded in the cavity and going right through the cavity, the antenna configured to radiate a substantially symmetrical electromagnetic field, wherein the antenna is configured to define either a substantially pure magnetic dipole when an electronic module applies a current to the antenna element such that the current increases from one extremity to the middle of the antenna element and decreases from the middle of the antenna element to the other extremity, or a substantially pure electric dipole when the electronic module applies a current to the antenna element such that the current increases from one extremity to the middle of the antenna element and continues to increase from the middle of the antenna element to the other extremity.