Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-05-08
2007-05-08
Tweel, Jr., John (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572200
Reexamination Certificate
active
10993668
ABSTRACT:
Radio Frequency Identification (RFID) readers with a directional coupler. At least one embodiment of the present invention provides an RFID reader designed to use a directional coupler to receive signals from an antenna which is connected to a radio frequency source of the reader to transmit signals. The directional coupler samples the signals received at the antenna and provides the received signal to a receiver of the RFID reader. In one example, the receiver of the RFID reader compares a portion of the signals from the radio frequency source with the received signal from the directional coupler to receive data from RF tags.
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Carrender Curtis L.
Speirs Donald F.
Alien Technology Corporation
Tweel , Jr. John
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