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.