System and method for varying response amplitude of radio transponders
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United States of America Patent
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Sep 7, 2010
Grant Date -
Oct 2, 2008
app pub date -
Nov 21, 2006
filing date -
Nov 21, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method are provided for modifying the effective reading range of an radio frequency identification tag. The tag, a chip based tag, includes an antenna and a chip in communication with the antenna. The chip includes circuitry including field effect transistors that can modify the effective reading range of the tag by modifying characteristics of the tag including the modulation depth of the backscatter signal, the impedance characteristics of the tag front end electronics, the power consumption characteristics and the threshold power-on voltage of the tag. These characteristics are change either temporarily or permanently in response to commands communicated to the tag from a radio frequency identification reader.
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