RF systems and methods for tracking and singulating tagged items
First Claim
Patent Images
1. A method for identifying an approximate location of a radio frequency tag, the method comprising:
- scanning zones of an area in an active mode as a first power level for identifying the zone in which the tag is located;
scanning portions of the zones in which the tag is located in a passive mode at a second power level for identifying the portion of the zone in which the tag is located.
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Abstract
A method for identifying an approximate location of a radio frequency tag includes scanning zones of an area in an active mode at a first power level for identifying the zone in which the tag is located, and scanning portions of the zone in which the tag is located in a passive mode at a second power level for identifying the portion of the zone in which the tag is located. An RFID system includes a plurality of RFID tags and an RFID interrogator in communication with the RFID tags.
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Citations
21 Claims
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1. A method for identifying an approximate location of a radio frequency tag, the method comprising:
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scanning zones of an area in an active mode as a first power level for identifying the zone in which the tag is located; scanning portions of the zones in which the tag is located in a passive mode at a second power level for identifying the portion of the zone in which the tag is located. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A Radio Frequency Identification (RFID) system, comprising:
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a plurality of RFID tags; and an RFID interrogator in communication with the RFID tags, the RFID interrogator performing at least a portion of the scanning of method 1.
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12. A method for identifying an approximate location of a radio frequency tag, the method comprising:
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scanning zones of an area in an active mode at a first power level for identifying the zone in which the tag is located; scanning sub-zones of the zone in which the tag is located in an active mode at a second power level for identifying the sub-zone in which the tag is located, the second power level being lower than the first power level; scanning portions of the sub-zone in which the tag is located in a passive mode at a third power level for identifying the portion of the zone in which the tag is located; and scanning sub-portions of the portion of the sub-zone in which the tag is located in a passive mode at a fourth level, the fourth power level being lower than the third power level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A Radio Frequency Identification (RFID) system, comprising:
- p1 a plurality of RFID tags; and
a plurality of RFID interrogators in communication with the plurality of RFID tags, at least one of the RFID interrogators scanning zones of an area in an active mode at a first power level for identifying the zone in which at least one of the RFID tags is located;scanning portions of the zone in which the tag is located in a passive mode at a second power level for identifying the portion of the zone in which the tag is located.
- p1 a plurality of RFID tags; and
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21. A system for identifying an approximate location of a radio frequency tag, the system comprising:
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an interrogator for scanning zones of an area in an active mode at a first power level for identifying the zone in which the tag is located; wherein the interrogator also scans sub-zones of the zone in which the tag is located in an active mode at a second power level for identifying the sub-zone in which the tag is located, the second power level being lower than the first power level; wherein the interrogator also scans portions of the sub-zone in which the tag is located in a passive mode at a third power level for identifying the portion of the zone in which the tag is located; and wherein the interrogator also scans sub-portions of the portion of the sub-zone in which the tag is located in a passive mode at a fourth power level, the fourth power level being lower than the third power level.
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Specification