Method and system for determining the distance between an RFID reader and an RFID tag using phase
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United States of America Patent
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Issued Date -
Jun 19, 2008
app pub date -
Dec 18, 2006
filing date -
Dec 18, 2006
priority date (Note) -
Abandoned
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Abstract
Embodiments of the present invention include a method of determining a distance between an RFID reader and an RFID tag comprising transmitting two or more signals having two or more corresponding frequencies from said reader and measuring a phase difference between backscattered signals from said tag. A distance between the tag and reader may be determined using the measured phase difference. In one embodiment, multiple frequency pairs may be used and an average distance may be generated.
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