Method and apparatus for sensing environment using a wireless passive sensor
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United States of America Patent
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Oct 10, 2017
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app pub date -
Apr 18, 2014
filing date -
Nov 18, 2006
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Abstract
A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized. In another embodiment, the quantized field strength is used to sense changes to the environment to which the RFID tag is exposed. In yet another embodiment, dynamic variations of the quantized impedance of the tank circuit are used to sense changes in the environment. Several alternate antennas are specially adapted to facilitate sensing of environmental conditions using the RFID tag.
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