Dual mode transmitter-receiver and decoder for RF...

Communications: electrical – Selective – Interrogation response

Reexamination Certificate

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Details

C340S010420, C340S010510, C340S010340, C340S010330, C340S572200, C340S572400, C340S572500

Reexamination Certificate

active

07741956

ABSTRACT:
An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature phase representations or determining phase transition edges in a phase of a received signal. The RF tag reader system predicts or follows the phase of the backscatter signal, thereby avoiding interference from nulls in the received signal waveform due to the non-stationary interrogation signal, relative movement or environmental effects. An acoustic RF-ID tag detection system detects the reradiated signal corresponding to respective transformation of a signal in the tag. Detection of either type of RF-ID tags therefore is possible, and the absence of any tag or absence of any valid tag also determined.

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