RFID sensor using pulse processing
First Claim
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1. A radio frequency identification tag device with sensors incorporated, comprising:
- a clock generator;
a sensing pulse generator with sensing elements incorporated for generating pulses the width of which changes with sensing values;
a logic circuit for generating a serial code sequence;
a signal generator that concatenates said sensing pulse and said serial code sequence;
a radio frequency tuned circuit;
a circuit for loading and unloading said radio frequency tuned circuit;
a circuit for providing power for said radio frequency identification tag device by converting radio frequency continuous wave signals into direct current power.
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Abstract
A radio frequency identification device having sensing elements incorporated in its tags, and the sensing value determines the width of a sensing pulse in its RFID code. Through a pulse-processing unit, during communication, digital sensing values are obtained by measuring the width of the sensing pulse. Since only discrete signals exist, the tag device is insensitive to the fluctuation in its power supply voltage, which is derived from a continuous wave RF carrier.
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Citations
18 Claims
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1. A radio frequency identification tag device with sensors incorporated, comprising:
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a clock generator; a sensing pulse generator with sensing elements incorporated for generating pulses the width of which changes with sensing values; a logic circuit for generating a serial code sequence; a signal generator that concatenates said sensing pulse and said serial code sequence; a radio frequency tuned circuit; a circuit for loading and unloading said radio frequency tuned circuit; a circuit for providing power for said radio frequency identification tag device by converting radio frequency continuous wave signals into direct current power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency interrogator device, comprising
a circuit that detects RFID signals generated by a radio frequency tag device; -
a pulse processing unit for measuring the width of pulses in said RFID signals; a sensing value processing unit that calculates sensing values based on pulse width values measured by said pulse processing unit; a continuous wave generation circuit; - View Dependent Claims (12, 13, 14, 15)
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16. A system for identifying and reading a sensor value, comprising:
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a clock generator, a sensing pulse generator with sensing elements incorporated for generating pulses the width of which changes with sensing values, a logic circuit for generating a serial code sequence, a signal generator that concatenates said sensing pulse and said serial code sequence, a radio frequency tuned circuit, a circuit for loading and unloading said radio frequency tuned circuit, and a circuit for providing power for said radio frequency identification tag device by converting radio frequency continuous wave signals into direct current power; a radio frequency interrogator device having a circuit that detects RFID signals generated by a radio frequency tag device, a pulse processing unit for measuring the width of pulses in said RFID signals, a sensing value processing unit that calculates sensing values based on pulse width values measured by said pulse processing unit, and a continuous wave generation circuit; said continuous wave generated by said radio frequency interrogator device has a frequency compatible with said tuned circuit; - View Dependent Claims (17, 18)
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Specification