System and method for detecting EAS/RFID tags using step listen
First Claim
Patent Images
1. A system for detecting a first signal from an electronic article surveillance (EAS) resonant circuit tag that is tuned to a frequency in an EAS frequency band and a second signal from a radio frequency identification (RFID) tag that is tuned to a frequency in an RFID frequency band, said system comprising:
- a transmitter for emitting said transmit signal, said transmit signal comprising a carrier signal of a frequency in said RFID frequency band and that is amplitude modulated for sending commands to the RFID tag, said transmit signal comprising modulation edges that cause said EAS tag to emit said first signal when said transmit signal impinges on said EAS resonant circuit tag;
a first receiver, tuned to a frequency in said EAS frequency band, for receiving said first signal, said first signal comprising the natural response of said EAS resonant circuit; and
a second receiver, tuned to a frequency in said RFID frequency band, for receiving said second signal.
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Abstract
A system and method for the real-time concurrent detection of 13.56 MHz RFID and 8.2 MHz EAS identification tags using a single stimulus signal.
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Citations
43 Claims
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1. A system for detecting a first signal from an electronic article surveillance (EAS) resonant circuit tag that is tuned to a frequency in an EAS frequency band and a second signal from a radio frequency identification (RFID) tag that is tuned to a frequency in an RFID frequency band, said system comprising:
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a transmitter for emitting said transmit signal, said transmit signal comprising a carrier signal of a frequency in said RFID frequency band and that is amplitude modulated for sending commands to the RFID tag, said transmit signal comprising modulation edges that cause said EAS tag to emit said first signal when said transmit signal impinges on said EAS resonant circuit tag;
a first receiver, tuned to a frequency in said EAS frequency band, for receiving said first signal, said first signal comprising the natural response of said EAS resonant circuit; and
a second receiver, tuned to a frequency in said RFID frequency band, for receiving said second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for concurrently detecting a first signal from an electronic article surveillance (EAS) resonant circuit tag that is tuned to a frequency in an EAS frequency band and a second signal from a radio frequency identification (RFID) tag that is tuned to a frequency in an RFID frequency band, said method comprising the steps of:
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(a) amplitude modulating a carrier signal having a frequency in said RFID frequency band to form said transmit signal, said transmit signal comprising modulation edges;
(b) emitting said transmit signal to impinge on said EAS resonant circuit tag and on said RFID tag;
(c) emitting said first signal by said EAS resonant circuit tag in response to said modulation edges of said transmit signal, said first signal comprising the natural response of said resonant circuit in said EAS resonant circuit tag;
(d) emitting said second signal by said RFID tag in response to said transmit signal; and
(e) detecting said first and second signals. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for concurrently detecting a first signal from an electronic article surveillance (EAS) resonant circuit tag that is tuned to a frequency in an EAS frequency band and a second signal from a radio frequency identification (RFID) tag that is tuned to a frequency in an RFID frequency band, said method comprising the steps of:
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(a) generating a transmit signal having the following characteristics;
a first oscillating signal component having a first amplitude, a second oscillating signal component having a second amplitude less than said first amplitude and wherein there is a sharp decrease between said first amplitude and said second amplitude and a third oscillating signal component having said first amplitude and wherein there is a sharp increase between said second amplitude and said first amplitude of said third oscillating signal;
(b) emitting said transmit signal to impinge on said EAS resonant circuit tag and on said RFID tag;
(c) emitting said first signal by said EAS resonant circuit tag in response to said sharp decrease of said transmit signal, said first signal comprising the natural response of said resonant circuit in said EAS resonant circuit tag;
(d) emitting said second signal by said RFID tag in response to said transmit signal; and
(e) detecting said first and second signals. - View Dependent Claims (42, 43)
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Specification