RADIO FREQUENCY IDENTIFICATION (RFID) METHOD AND APPARATUS FOR MAXIMIZING RECEIVE CHANNEL SIGNAL-TO-NOISE RATIO BY ADJUSTING PHASE TO MINIMIZE NOISE
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United States of America Patent
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Issued Date -
Jul 16, 2009
app pub date -
Jan 8, 2009
filing date -
Jan 10, 2008
priority date (Note) -
Abandoned
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Abstract
Noise in a receive path of a radio frequency identification (RFID) reader is reduced by using a phase shifter. By reducing the noise, the signal-to-noise ratio (SNR) in the receive path of the RFID reader is improved, thereby increasing the number of RFID tags that can be read in a noisy environment over time and/or improving the capability to distinguish a return signal of the RFID tag(s) from noise. The phase shifter adds a phase shift to a reflected signal and a leakage signal, or to a local oscillation signal.
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