Patent ID: 8378908
Filing Date: 2013-02-19
Classification: G01V,H01Q

Abstract:
1. An array antenna formed on a body of a MWD/LWD tool disposed in a well, said array antenna comprising: a plurality of cross-dipole elements formed on the tool body, each of said plurality of cross-dipole elements comprising at least first and second wires crossing the surface of a high magnetic permeability material, wherein none of the wires is in electrical contact with each other or the high magnetic permeability material; wherein each of said plurality of cross-dipole elements is disposed within a slot recess in an outer surface of a wall of said tool body and; wherein the first wire traverses at least two elements to form an antenna with a magnetic dipole moment in a first direction, and the second wire traverses the same elements in a different direction to form a magnetic dipole in a second direction.