Alien Technology Corporation

Gregory P Katterhagen

Robert A Martin

Paul Stephen Drzaic

Curt Carrender

John Michael Price

Donald F Speirs

According to several embodiments of the invention, a radio frequency identification (RFID) interrogator utilizing a circuit to remove unwanted distortion from a received signal is described. The interrogator transmits a transmitted signal continuously, while receiving a received signal from a radio frequency identification (RFID) tags. The circuit samples the transmitted signal, and removes the unwanted distortion created by the transmitted signal from the received signal.

Method and appratus for removing distortion in radio frequency signals

According to an embodiment of the invention, a patch antenna includes a patch coupled to a ground plane. The ground plane includes a first and second strip line. When the first strip line is activated, the antenna generates a signal having a first polarization, and when the second strip line is activated, the antenna generates a second polarization. The first polarization may be a horizontal polarization, and the second polarization may be a vertical polarization. The antenna may be incorporated into a radio frequency identification (RFID) interrogator, which may be used to read RFID tags attached to individual items.

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Gilroy, CA, United States of America

Gregory P Katterhagen