Noise cancellation for RFID backscatter
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United States of America Patent
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Dec 25, 2012
Grant Date -
May 13, 2010
app pub date -
Nov 12, 2009
filing date -
Nov 13, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatuses for removing unwanted noise by a radio frequency identification (RFID) interrogator are provided. The interrogator transmits a transmitted signal while receiving a received signal. The received signal can include backscatter modulated signals from one or more RFID tags, as well as unmodulated reflections of the transmitted signal from the environment. The unmodulated reflections are undesirable and may make tag signal extraction difficult. A canceling signal is summed with the received signal to cancel or reduce the unmodulated reflections prior to tag signal extraction. In a specific embodiment, a phase shifted, amplitude adjusted reflection of the transmit signal is used by a directional coupler as the canceling signal.
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