ELECTROMAGNETIC ANTENNAS SYSTEM AND METHOD OF USE

Abstract: a system of electromagnetic antennas including antennas constructed on the surface sections of a steel cylinder and made of electric antenna wires around magnetically highly permeable magnetic cores. the permeability of magnetic material is controlled by a separate electric wire winding system on the magnetic core. an antenna is turned off by a current in the windings used to saturate the magnetic core in the antenna. a saturated magnetic core has an effective relative permeability of one for electromagnetic field. zero current in the windings of an antenna restores the high permeability of the magnetic core and activates the antenna. for a pair of antennas close by with possible mutual coupling, an on-off sequence is used so that one antenna is active and the other is off. mutual coupling between the pair of antennas is eliminated. air-hanging calibration is unneeded on tools utilizing disclosed antenna systems.

Inventor(s): Jian-Qun Wu, Pedro Segura, Larry Thompson

CPC Classification: E21B47/13 (by electromagnetic energy, e.g. radio frequency)

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