RFID SYSTEMS
First Claim
1. An RFID communications network, the network comprising:
- a plurality of passive RFID tags;
at least one RF power supply device; and
at least one RFID reader; and
wherein a said RFID tag is configured to use a first frequency to receive power for powering said tag from said RF power supply device and to use a second, different frequency to communicate with said RFID reader; and
wherein said plurality of RFID tags are configured to use the same said first frequency to receive said power, and one or both of different said second frequencies and different communication times to communicate with said RFID reader, a said second frequency being different to said first frequency.
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Accused Products
Abstract
We describe an RFID communications network comprising: a plurality of passive RFID tags; at least one RF power supply device; and at least one RFID reader; and wherein a said RFID tag is configured to use a first frequency to receive power for powering said tag from said RF power supply device and to use a second, different frequency to communicate with said RFID reader; and wherein said plurality of RFID tags are configured to use the same said first frequency to receive said power, and all use different second frequencies to communicate with said RFID reader. The tags may be used to generate probability data, the probability data for a said identified tag being dependent upon a probability of the tag belonging to a collection the contents of which are to be verified; contents of the collection may then be verified against a schedule using processed verification data.
52 Citations
38 Claims
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1. An RFID communications network, the network comprising:
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a plurality of passive RFID tags; at least one RF power supply device; and at least one RFID reader; and wherein a said RFID tag is configured to use a first frequency to receive power for powering said tag from said RF power supply device and to use a second, different frequency to communicate with said RFID reader; and wherein said plurality of RFID tags are configured to use the same said first frequency to receive said power, and one or both of different said second frequencies and different communication times to communicate with said RFID reader, a said second frequency being different to said first frequency. - View Dependent Claims (2, 4, 6, 8, 10, 11)
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3. (canceled)
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5. (canceled)
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7. (canceled)
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9. (canceled)
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12. (canceled)
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13. (canceled)
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15. (canceled)
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16. A method of determining a location of an RFID tagged product using a mobile RFID reader in an environment comprising a plurality of RFID tags and in which said RFID reader during a tag read event may detect signals from a plurality of different RFID tags, the method comprising:
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providing a plurality of RFID location tags; locating said tagged products in proximity to said RFID location tags; and reading an RFID tag of a said product and at least one said RFID location tag to determine a potential location of said product. - View Dependent Claims (17, 19, 20, 22, 23, 24, 25, 27, 28, 31, 33, 34, 36)
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18. (canceled)
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21. (canceled)
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26. (canceled)
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29. (canceled)
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32. (canceled)
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35. (canceled)
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38. (canceled)
Specification