Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2007-05-08
2007-05-08
Anderson, Matthew (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S041100, C455S041200, C455S041300, C340S001100, C340S505000, C340S572100, C235S383000, C235S380000, C235S492000, C235S487000
Reexamination Certificate
active
10290339
ABSTRACT:
An RFID system includes a hybrid backscatter-based RFID tag protocol-compatible with existing 802.11x/Bluetooth Standards as well as RFID standards. The tag is linked to a multi-protocol Interrogator via a generated RF Continuous Wave (CW) field. The tag includes an antenna coupled to an RFID and a Bluetooth/802.11x transceiver section. A Protocol Processor services RFID and transceiver sections and is coupled to the antenna via a backscatter switch. The Interrogator can switch the tag to an RFID backscatter radiation mode where the processor switches the antenna impedance to reflect the CW signal. For transceiver operation the processor switches antenna impedance in synchronization with a frame organized bit stream. For reception, the RFID section utilizes demodulation techniques, typically Amplitude Shift Keying (ASK), and provides a wake up mode within a predetermined distance of the Interrogator. The transceiver may operate in a backscatter or regular mode as directed by an Access Point.
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Anderson Matthew
Baker & Botts LLP
Pan Yuwen
Symbol Technologies Inc.
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