Variable frequency tag
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United States of America Patent
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Feb 19, 2013
Grant Date -
Jul 12, 2012
app pub date -
Mar 19, 2012
filing date -
Jul 3, 2002
priority date (Note) -
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Abstract
An antenna assembly is operative for receiving interrogating radiation at a variable frequency tag and generating a corresponding received signal, and for receiving a signature signal and radiating corresponding response radiation. A logic unit is operative for receiving the received signal and outputting the signature signal in response, the signature signal including a signature code for use in identifying the tag. A voltage controlled oscillator is operative for controlling a rate at which the signature code is output; and a power supply is operative for providing an electrical potential difference for energizing the tag. The voltage controlled oscillator is operable to output the signature code at a rate which is governed by the magnitude of the received signal.
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