Tagging system having resonant frequency shift compensation
First Claim
1. A RF tagging system comprising:
- a tag having thereon a plurality of reference resonant circuits and a plurality of data resonant circuits, each of said data resonant circuits being resonant at a different actual resonant frequency corresponding to an undisturbed resonant frequency selected from a predetermined plurality of known resonant frequencies and each said reference resonant circuit being resonant at an actual different resonant frequency corresponding to a predetermined known undisturbed different resonant frequency;
determining means for determining the actual resonant frequencies of each said reference resonant circuit; and
compensating means for determining for each said reference resonant circuit the frequency difference between its actual resonant frequency and its corresponding predetermined known undisturbed resonant frequency and responsive thereto providing a compensation factor for the resonant frequency of each said data resonant circuit,said determining means determining the actual resonant frequency of each said data resonant circuit, andsaid compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant circuits for determining the undisturbed resonant frequencies of said data resonant circuits.
5 Assignments
0 Petitions
Accused Products
Abstract
A tagging system (20) compensates for both resonant frequency spatial dependent shifts and resonant frequency dependent shifts for detecting data resonant circuits (DC1-DC6) on an RF tag 10 which is carried by a tagged object (34). The system includes at least one transmitter (26) and at least one receiver (28) for determining the actual resonant frequencies of reference resonant circuits (SC1-SC5, FC1-FC4) on the tag 10. A microprocessor controller (22), in response to the frequency difference between the undisturbed resonant frequencies of the reference resonant circuits and the actual resonant frequencies of the reference resonant circuits, provides compensating factors to compensate for the spatial and frequency effects of the resonant frequencies of the resonant circuits on the tag (10). The transmitter and receiver determine the actual resonant frequency of each data resonant circuit (DC1-DC6) on the tag (10). The microprocessor controller (22) then determines the undisturbed resonant frequencies of the data resonant circuits on tag (10) from the actual resonant frequencies of the data resonant circuits and the compensation factors.
18 Citations
38 Claims
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1. A RF tagging system comprising:
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a tag having thereon a plurality of reference resonant circuits and a plurality of data resonant circuits, each of said data resonant circuits being resonant at a different actual resonant frequency corresponding to an undisturbed resonant frequency selected from a predetermined plurality of known resonant frequencies and each said reference resonant circuit being resonant at an actual different resonant frequency corresponding to a predetermined known undisturbed different resonant frequency; determining means for determining the actual resonant frequencies of each said reference resonant circuit; and compensating means for determining for each said reference resonant circuit the frequency difference between its actual resonant frequency and its corresponding predetermined known undisturbed resonant frequency and responsive thereto providing a compensation factor for the resonant frequency of each said data resonant circuit, said determining means determining the actual resonant frequency of each said data resonant circuit, and said compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant circuits for determining the undisturbed resonant frequencies of said data resonant circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A RF tagging system comprising:
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a tag having thereon a plurality of first reference resonant circuits, a plurality of second reference resonant circuits, and a plurality of data resonant circuits, each said data resonant circuit being resonant at a different actual resonant frequency corresponding to an undisturbed resonant frequency selected from a predetermined plurality of known resonant frequencies and being located at a predetermined known location on said tag, each said first reference resonant circuit being resonant at an actual different resonant frequency corresponding to a predetermined known undisturbed different resonant frequency and being located at a predetermined known location on said tag, and each said second reference resonant circuit being resonant at an actual different resonant frequency corresponding to a predetermined known undisturbed different resonant frequency and being located at a predetermined known location on said tag; determining means for determining the actual resonant frequency of each said reference resonant circuits; compensating means for determining, for each said first reference resonant circuit the frequency difference between its actual resonant frequency and its corresponding predetermined known undisturbed resonant frequency, for determining, for each said second reference resonant circuit the frequency difference between its actual resonant frequency and its corresponding predetermined known undisturbed resonant frequency, and being responsive to said determined frequency differences for providing a compensation factor for the resonant frequency of each said data resonant circuit; said determining means determining the actual resonant frequency of each said data resonant circuit, and said compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant circuits for determining the undisturbed resonant frequencies of said data resonant circuits. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A RF tagging system comprising:
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a tag having thereon a plurality of reference resonant means and a plurality of data resonant means, each of said data resonant means being resonant at a different actual resonant frequency corresponding to an undisturbed resonant frequency selected from a predetermined plurality of known resonant frequencies and each said reference resonant means being resonant at an actual different resonant frequency corresponding to a predetermined known undisturbed different resonant frequency; determining means for determining the actual resonant frequencies of each said reference resonant means; and compensating means for determining for each said reference resonant means the frequency difference between its actual resonant frequency and its corresponding predetermined known undisturbed resonant frequency and responsive thereto providing a compensation factor for the resonant frequency of each said data resonant means, said determining means determining the actual resonant frequency of each said data resonant means, and said compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant means for determining the undisturbed resonant frequencies of said data resonant means.
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35. A tagging system comprising:
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a tag having thereon at least one reference resonant means and at least one data resonant means, each of said data resonant means being resonant at at least a different actual resonant frequency corresponding to an a designed resonant frequency selected from a predetermined plurality of known resonant frequencies and each said reference resonant means being resonant at at least an actual different resonant frequency corresponding to a predetermined known designed different resonant frequency; determining means for determining the actual resonant frequencies of each said reference resonant means; and compensating means for determining for each said reference resonant means the frequency difference between its actual resonant frequency and its corresponding predetermined known designed resonant frequency and responsive thereto providing a compensation factor for the resonant frequency of each said data resonant means, said determining means determining the actual resonant frequency of each said data resonant means, and said compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant means for determining the designed resonant frequencies of said data resonant means. - View Dependent Claims (36)
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37. A tagging system comprising:
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a tag having thereon a plurality of reference resonant modes and a plurality of data resonant modes, each of said data resonant modes being resonant at a different actual resonant frequency corresponding to an undisturbed resonant frequency selected from a predetermined plurality of known resonant frequencies and each said reference resonant modes being resonant at an actual different resonant frequency corresponding to a predetermined known undisturbed different resonant frequency; determining means for determining the actual resonant frequencies of each said reference resonant modes; and compensating means for determining for each said reference resonant modes the frequency difference between its actual resonant frequency and its corresponding predetermined known undisturbed resonant frequency and responsive thereto providing a compensation factor for the resonant frequency of each said data resonant modes, said determining means determining the actual resonant frequency of each said data resonant modes, and said compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant modes for determining the undisturbed resonant frequencies of said data resonant modes.
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38. A RF tagging system comprising:
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a tag having thereon a plurality of reference resonant modes and a plurality of data resonant modes, each of said data resonant modes being resonant at a different actual resonant frequency corresponding to an a designed resonant frequency selected from a predetermined plurality of known resonant frequencies and each said reference resonant modes being resonant at an actual different resonant frequency corresponding to a predetermined known designed different resonant frequency; determining means for determining the actual resonant frequencies of each said reference resonant modes; and compensating means for determining for each said reference resonant modes the frequency difference between its actual resonant frequency and its corresponding predetermined known designed resonant frequency and responsive thereto providing a compensation factor for the resonant frequency of each said data resonant modes, said determining means determining the actual resonant frequency of each said data resonant modes, and said compensating means being responsive to said compensation factors and the actual resonant frequencies of said data resonant modes for determining the designed resonant frequencies of said data resonant modes.
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Specification