Dual mode transmitter-receiver and decoder for RF transponder tags
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United States of America Patent
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Sep 25, 2012
Grant Date -
Oct 28, 2010
app pub date -
May 10, 2010
filing date -
Nov 29, 1996
priority date (Note) -
Expired
status (Latency Note)
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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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