RADIO-FREQUENCY IDENTIFICATION SYSTEM
First Claim
1. A radio-frequency identification system reader comprising:
- a resonant circuit comprising a plurality of coils;
a means for repeatedly driving the resonant circuit with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the resonant circuit;
a means for obtaining a tag response signal from the resonant circuit;
a means for extracting tag information from the tag response signal.
1 Assignment
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Accused Products
Abstract
The invention is a radio-frequency identification system consisting of a reader and a tag. The reader comprises a transmit/receive resonant circuit comprising one or more coils, a means for repeatedly driving the transmit/receive resonant circuit with pulses of a periodic signal, a means for obtaining a tag response signal from the transmit/receive resonant circuit, a means for extracting tag information from the tag response signal obtained from the transmit/receive resonant circuit, a receive resonant circuit comprising one or more coils, a means for obtaining a tag response signal from the receive resonant circuit, and a means for extracting tag information from the tag response signal obtained from the receive resonant circuit. The tag comprises a plurality of resonant circuits, a means for recognizing he presence of an interrogating magnetic field, and a means for embedding information to be communicated to the interrogating reader in at least one coil current.
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Citations
77 Claims
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1. A radio-frequency identification system reader comprising:
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a resonant circuit comprising a plurality of coils; a means for repeatedly driving the resonant circuit with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the resonant circuit; a means for obtaining a tag response signal from the resonant circuit; a means for extracting tag information from the tag response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio-frequency identification system reader comprising:
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a transmit/receive resonant circuit comprising one or more coils; a means for repeatedly driving the transmit/receive resonant circuit with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the resonant circuit; a means for obtaining a tag response signal from the transmit/receive resonant circuit; a means for extracting tag information from the tag response signal obtained from the transmit/receive resonant circuit; a receive resonant circuit comprising one or more coils; a means for obtaining a tag response signal from the receive resonant circuit; a means for extracting tag information from the tag response signal obtained from the receive resonant circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A radio-frequency identification system reader comprising:
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a plurality of resonant circuits, each resonant circuit comprising one or more coils connected in parallel with a capacitor; a means for repeatedly driving each of the plurality of resonant circuits with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the resonant circuit being driven; a means for obtaining one or more tag response signals from one or more of the plurality of resonant circuits; a means for extracting tag information from the one or more tag response signals. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A radio-frequency identification system reader comprising:
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a plurality of transmit/receive resonant circuits, each transmit/receive resonant circuit comprising one or more coils; a means for repeatedly driving each of the plurality of transmit/receive resonant circuits with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the transmit/receive resonant circuit being driven; a means for obtaining one or more tag response signals from one or more of the plurality of transmit/receive resonant circuits; a means for extracting tag information from the one or more tag response signals. one or more receive resonant circuits, each receive resonant circuit comprising one or more coils; a means for obtaining one or more tag response signals from one or more receive resonant circuits; a means for extracting tag information from one or more tag response signals obtained from the receive resonant circuits. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A radio-frequency identification system reader comprising:
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a transmit/receive resonant circuit comprising one or more coils; a means for repeatedly driving the transmit/receive resonant circuit with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the resonant circuit; a means for obtaining the tag response signal from the transmit/receive resonant circuit; a means for extracting tag information from the tag response signal from the transmit/receive resonant circuit; a plurality of receive resonant circuits, each receive resonant circuit comprising one or more coils; a means for obtaining one or more tag response signals from one or more receive resonant circuits; a means for extracting tag information from one or more tag response signals obtained from the receive resonant circuits. - View Dependent Claims (45, 46, 47, 48, 49)
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50. A radio-frequency identification system reader comprising:
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one or more resonant circuits, each resonant circuit comprising one or more coils, at least one coil being wound on and supported by a coil form, the coil form comprising a shape-establishing member and one or more wire-support members for maintaining the coil windings on or in the proximity of the surface of the shape-establishing member. a means for repeatedly driving at least one of the resonant circuits with pulses of a periodic signal, the fundamental frequency of the periodic signal being the resonant frequency of the resonant circuit being driven; a means for obtaining one or more tag response signals from one or more of the resonant circuits; a means for extracting tag information from the one or more tag response signals. - View Dependent Claims (51, 52)
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53. A radio-frequency identification system tag comprising:
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a plurality of resonant circuits, a resonant circuit comprising a coil and a capacitor; a means for recognizing he presence of an interrogating magnetic field utilizing signals from one or more of the resonant circuits; a means for embedding information to be communicated to the interrogating reader in at least one coil current. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77)
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Specification