Automatic mode detection in a dual operating mode RFID tag
First Claim
1. A radio-frequency identification (RFID) system, comprising:
- an RFID reader to transmit a modulated radio frequency (RF) signal and receive an RFID transponder-modulated RF response signal; and
an RFID transponder comprising;
a receiver configured to receive a continuous wave RF signal and said modulated RF signal; and
a logic circuit configured to detect whether said receiver is receiving said continuous wave RF signal or said modulated RF signal and to cause the RFID transponder to transmit a first response when said continuous wave RF signal is detected and a second response when said RF modulated signal is detected,wherein said logic circuit is further configured to receive an input designating either one of said continuous wave RF signal or said modulated RF signal as a dominant mode and the other one of said continuous wave RF signal or said modulated RF signal as a recessive mode.
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Accused Products
Abstract
A multi-mode, preferably dual mode, radio frequency identification (RFID) tag is adapted for automatic detection of whether a RFID reader located within communication range of the RFID tag is transmitting a continuous wave (CW) or modulated wave types of RF signal, and accordingly, mandating a response from the tag in read-only (RO) mode or read/write (R/W) mode, respectively. The tag includes means for designating one of the RO and R/W operating modes as a default mode of the tag, and for switching the tag from its default mode to its other operating mode, and vice versa, according to a rule for determining the frequency of occurrence of a selected event related to signal type of the reader. A device-implemented method of this automatic detection, and a method of fabricating the tag, are also disclosed.
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Citations
14 Claims
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1. A radio-frequency identification (RFID) system, comprising:
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an RFID reader to transmit a modulated radio frequency (RF) signal and receive an RFID transponder-modulated RF response signal; and an RFID transponder comprising; a receiver configured to receive a continuous wave RF signal and said modulated RF signal; and a logic circuit configured to detect whether said receiver is receiving said continuous wave RF signal or said modulated RF signal and to cause the RFID transponder to transmit a first response when said continuous wave RF signal is detected and a second response when said RF modulated signal is detected, wherein said logic circuit is further configured to receive an input designating either one of said continuous wave RF signal or said modulated RF signal as a dominant mode and the other one of said continuous wave RF signal or said modulated RF signal as a recessive mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio-frequency identification (RFID) system, comprising:
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an RFID reader to transmit a continuous wave RF signal and receive a modulated backscattered RF response signal; and an RFID transponder comprising; a receiver configured to receive said continuous wave RF signal and a modulated RF signal; and a logic circuit configured to detect whether said receiver is receiving said continuous wave RF signal or said modulated RF signal and to cause the RFID transponder to transmit a first response when said continuous wave signal is detected and a second response when said modulated signal is detected, wherein said logic circuit is further configured to receive an input designating either one of said continuous wave RF signal and said modulated RF signal as a dominant mode and the other one of said continuous wave RF signal and said modulated RF signal as a recessive mode. - View Dependent Claims (14)
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Specification