Patent ID: 8471563

Claim:
An electromagnetic antenna including an antenna wire and an array of magnetic dipole antenna elements disposed within antenna housing wherein said dipole elements are configured to direct a magnetic field to one side of said antenna housing while essentially canceling said magnetic field on the opposite side of said antenna housing, said antenna further comprising: a first and a second set of grooved antenna elements wherein said first and said second sets of grooved antenna elements are axially spaced along said antenna housing, grooves comprising each said set of grooved antenna elements are essentially parallel to the major axis of said antenna housing, and said antenna wire perpendicularly traverses said grooves perpendicular to said major axis; and a first and a second set of hole antenna elements disposed axially in said antenna housing between said first and second sets of grooved antenna elements, wherein said first and said second sets of said hole antenna elements are azimuthally spaced around the periphery of said antenna housing, and holes comprising each said set of hole antenna elements are essentially perpendicular to said major axis of said antenna housing.