Patent ID: 8174385

Claim:
A radio frequency identification (RFID) reader adapted to receive an identification signal transmitted from an RFID tag for determining a tag identification code of the RFID tag based on the identification signal, the RFID reader comprising: a plurality of signal antennas, which are respectively arranged in directions that are not parallel to each other and are not co-linear with each other, each of the signal antennas having a predetermined antenna field pattern and operating with a predetermined carrier wave frequency; a wireless receiver, which is connected to the signal antennas to receive the identification signal from the RFID tag via the signal antennas; a signal conversion unit, which is connected to the wireless receiver to convert the received identification signal into a digital identification signal; a frequency generator, which generates the carrier wave frequency to the signal antennas via the wireless receiver; and a microprocessor, which is connected to the signal conversion unit and the frequency generator for controlling the frequency generator to generate the carrier wave frequency and for the determination of the tag identification code of the RFID tag based on the digital identification signal.