Patent ID: 6590542
Filing Date: 2003-07-08
Classification: H01Q

Abstract:
A double loop antenna driven by a transceiver for generating magnetic fields extending from the antenna for coupling power to a loop antenna of a tag, the double antenna loop comprising,an outer loop which may be square lying in a plane having a top leg, a bottom leg, a right leg and a left leg, and a center leg connected between the top leg and the bottom leg forming a first loop and a second loop, the first loop comprising the left leg, the center leg, a left half of the top leg, and a left half of the bottom leg, the second loop comprising the right leg, the center leg, a right half of the top leg and a right half of the bottom leg, the center leg connected to the transceiver for generating currents through first and second loops for generating transverse and aligned magnetic fields with the tag loop coupling to the transverse and aligned magnetic fields for receiving power from the transceiver.