System for item and orientation identification
First Claim
1. A method for determining an identity of a responder, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the method comprising:
- providing a first grid antenna having a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
for a multiplicity of cells of the first grid, detecting a first signal from the reference resonant circuit;
determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
for cells of the set, detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset;
associating a respective cell of the set to each respective second signal; and
determining the identity of the responder in accordance with positional relationships among the associated cells.
3 Assignments
0 Petitions
Accused Products
Abstract
A system includes an identification circuit, a grid antenna, a receiver, and a processor. The identification circuit includes resonant circuits formed on a substrate within a perimeter. Identification may be based on a quantity or physical arrangement of detected resonant circuits within the perimeter. One resonant circuit provides a reference signal. Any resonant circuit may be tuned in accordance with the reference signal by the addition or subtraction of reactance formed on the substrate. A capacitance of a first group of capacitors located outside a turn of an inductor is roughly equal to a capacitance of a second group of capacitors located inside the turn. Any resonant circuit may also be tuned by affixing a resonance modifying element, for example a sticker, to the identification circuit. The grid antenna provides antenna field patterns, one for each cell location. The receiver communicates with the identification circuit via the grid antenna. The processor controls the receiver according to a method including: (a) detecting a first signal at a first grid location; (b) determining an offset as a difference between a frequency of the first signal and a predetermined frequency; (c) detecting a second signal at a second grid location; (d) determining an identification in accordance with the first and second locations, the second signal, the offset determined in step (b), and any offset accomplished by a sticker; and (e) determining an orientation in accordance with the first and second grid locations.
109 Citations
49 Claims
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1. A method for determining an identity of a responder, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the method comprising:
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providing a first grid antenna having a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
for a multiplicity of cells of the first grid, detecting a first signal from the reference resonant circuit;
determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
for cells of the set, detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset;
associating a respective cell of the set to each respective second signal; and
determining the identity of the responder in accordance with positional relationships among the associated cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for determining an identity of a responder, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the method comprising:
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providing a first grid antenna having a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
for a multiplicity of cells of the first grid, detecting a first signal from the reference resonant circuit;
determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
for cells of the set, detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset; and
determining the identity of the responder in accordance with a frequency of each respective second signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for determining whether a responder is misoriented in a detection field, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the method comprising:
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providing a first grid antenna having a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
for a multiplicity of cells of the first grid, detecting a signal from the reference resonant circuit in;
determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
for cells of the set, detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset;
associating at least one respective cell of the set to each respective second signal; and
determining that the responder is misoriented when a second signal is associated with more than one cell. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A system for determining an identity of a responder, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the system comprising:
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means for providing a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
means for detecting, from at least one cell of a multiplicity of cells of the first grid, a first signal from the reference resonant circuit;
means for determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
means for determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
means for detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset;
means for associating a respective cell of the set to each respective second signal; and
means for determining the identity of the responder in accordance with positional relationships among the associated cells.
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48. A system for determining an identity of a responder, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the system comprising:
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means for providing a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
means for detecting, from at least one cell of the multiplicity of cells of the first grid, a first signal from the reference resonant circuit;
means for determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
means for determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
means for detecting in accordance with the offset and for each resonant circuit of the plurality a respective second signal at a respective cell of the set; and
means for determining the identity of the responder in accordance with a frequency of each respective second signal.
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49. A system for determining whether a responder is misoriented in a detection field, the responder comprising a plurality of resonant circuits and a reference resonant circuit all arranged within a perimeter, the system comprising:
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means for providing a plurality of antenna field patterns located with respect to a first grid having a plurality of cells;
means for detecting, from at least one cell of the multiplicity of cells of the first grid, a first signal from the reference resonant circuit;
means for determining a set of cells of the plurality, each cell of the set being within a super-perimeter enclosing a selected cell of the multiplicity;
means for determining an offset in accordance with a difference between a frequency of the first signal and a predetermined frequency;
means for detecting a respective second signal from each resonant circuit of the plurality in accordance with the offset;
means for associating at least one cell of the set to each respective second signal; and
means for determining that the responder is misoriented when a second signal is associated with more than one cell.
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Specification