System and method using frequency hopping to identify items tagged with RFID tags in an enclosed space
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
May 23, 2016
filing date -
Dec 29, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method comprises a plurality of RF antennas having beams directed to a storage space in which medical items having RFID tags are stored. Each antenna is controlled to inject energy at a different frequency in a frequency-hopping set of frequencies to activate the tags. The return signal strength is monitored and for each tag that responds, the antenna location, frequency of the injected energy, identification response, and signal strength are stored as identification data. If a tag fails to respond in new scans, the antenna at which the tag last responded receives all the frequency-hopping frequencies in an attempt to locate the tag. If new tags are found, they are compared to a list of expected new medical items.
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