Wireless transponder for a security system
First Claim
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1. An apparatus, comprising:
- a first receiver to receive a reply signal at a first frequency from a marker within an interrogation zone for an electronic article surveillance system; and
a first transmitter to connect to said receiver, said first transmitter to transmit said reply signal at a second frequency.
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Abstract
Method and apparatus for a wireless transponder for a security system are described.
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Citations
29 Claims
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1. An apparatus, comprising:
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a first receiver to receive a reply signal at a first frequency from a marker within an interrogation zone for an electronic article surveillance system; and
a first transmitter to connect to said receiver, said first transmitter to transmit said reply signal at a second frequency. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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- 2. The apparatus of claim 2, wherein said first frequency comprises a lower frequency in a range between 50 Hertz to 13 Megahertz, and said second frequency comprises a higher frequency in a range between 13.01 Megahertz to 2.45 Gigahertz.
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12. A system, comprising:
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a first transmitter to transmit an interrogation signal within an interrogation zone;
a marker to generate a reply signal in response to said interrogation signal;
a first transponder to receive said reply signal at a first frequency, and transmit said reply signal at a second frequency;
a first receiver to receive said reply signal at said second frequency, and convert said reply signal to said first frequency; and
a controller to detect said marker within said interrogation zone using said reply signal, and output a marker detect signal in accordance with said detection. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method, comprising:
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transmitting an interrogation signal in an interrogation zone;
generating a reply signal from a marker in response to said interrogation signal;
repeating said reply signal by a transponder;
receiving said reply signal from said transponder; and
determining whether said marker is within said interrogation zone in accordance with said reply signal. - View Dependent Claims (26, 27, 28, 29)
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Specification