RFID sensor using pulse processing
First Claim
Patent Images
1. A radio frequency identification tag device with sensors incorporated, comprising:
- a clock generator;
a sensing pulse generator with sensing elements incorporated for generating sensing pulses, at least one of which has its pulse width changing with sensing values obtained from said sensing elements;
a logic circuit for generating a binary code sequence signal, which includes a blank code and an identification code containing information about said sensing elements;
a signal generator that generates a mixed code sequence by concatenating said sensing pulses with said binary code sequence signal through a logic operation of said blank code and said sensing pulses;
a radio frequency tuned circuit;
a circuit for loading and unloading said radio frequency tuned circuit;
a circuit for providing power to said radio frequency identification tag device by converting radio frequency continuous wave signals into direct current power.
0 Assignments
0 Petitions
Accused Products
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.
59 Citations
14 Claims
-
1. A radio frequency identification tag device with sensors incorporated, comprising:
-
a clock generator; a sensing pulse generator with sensing elements incorporated for generating sensing pulses, at least one of which has its pulse width changing with sensing values obtained from said sensing elements; a logic circuit for generating a binary code sequence signal, which includes a blank code and an identification code containing information about said sensing elements; a signal generator that generates a mixed code sequence by concatenating said sensing pulses with said binary code sequence signal through a logic operation of said blank code and said sensing pulses; a radio frequency tuned circuit; a circuit for loading and unloading said radio frequency tuned circuit; a circuit for providing power to 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. A radio frequency interrogator device, comprising:
-
a circuit that detects RFID signals, which include sensing pulses, at least one of which has its pulse width changing with sensing values obtained from sensor elements in a radio frequency tag device, and a binary ID code sequence signal generated by said radio frequency tag device, wherein said RFID signals are generated by concatenating said sensing pulses with said binary ID code sequence signal through a logic operation of a blank code and said sensing pulses, wherein said binary ID code signal includes said blank code and an identification code of said radio frequency tag device; a pulse processing unit for measuring the width of said sensing pulses in said RFID signals; a serial communication unit for obtaining digital information from said binary ID code sequence signal; a sensing value processing unit that calculates sensing values based on the pulse width measured by said pulse processing unit and the information carried by said binary ID code sequence signal; a continuous wave generation circuit. - View Dependent Claims (8, 9, 10, 11)
-
-
12. A system for identifying and reading a sensor value, comprising:
-
at least one radio frequency identification tag device having a clock generator, a sensing pulse generator with sensing elements incorporated for generating sensing pulses, at least one of which has its pulse width changing with sensing values obtained from said sensing elements, a logic circuit for generating a binary code sequence signal, which includes a blank code and an identification code containing information about said sensing elements, a signal generator that generates a mixed code sequence by concatenating said sensing pulses with said binary code sequence signal through a logic operation of said blank code and said sensing pulses, a radio frequency tuned circuit, a circuit for loading and unloading said radio frequency tuned circuit, and a circuit for providing power to 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 said mixed code sequence generated by said radio frequency tag device, a pulse processing unit for measuring the width of said sensing pulses, a serial communication unit for obtaining digital information from said binary code sequence signal, a sensing value processing unit that calculates sensing values based on the pulse width measured by said pulse processing unit and the information carried by said binary code sequence signal, 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 (13, 14)
-
Specification