ENVIRONMENTALLY SENSITIVE MULTI-FREQUENCY ANTENNA
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United States of America Patent
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Issued Date -
Apr 1, 2004
app pub date -
Aug 7, 2002
filing date -
Aug 7, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A transponder is secured to a substrate with a temperature sensitive adhesive. A pair of tabs acts as a first antenna to allow the transponder to respond to interrogation at a first frequency, and a slot in the substrate acts as a second antenna to allow the transponder to respond to interrogation at a second frequency. When the transponder is secured to the substrate with the temperature sensitive adhesive, the transponder only operates at the second frequency. The temperature sensitive adhesive melts when exposed to a temperature above a predetermined threshold, causing the transponder to decouple from the slot and operate at the first frequency. An alternate embodiment functions similarly for pressure sensing.
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