Title:
ENVIRONMENTALLY SENSITIVE MULTI-FREQUENCY ANTENNA
Document Type and Number:
WIPO Patent Application WO2004015624
Kind Code:
A3
Abstract:
A transponder is secured to a substrate (20) with a temperature sensitive adhesive (30). A pair of tabs (16, 18) acts as a first antenna to allow the transponder to respond to interrogation at a first frequency, and a slot (22) 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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Inventors:
FORSTER IAN JAMES
KING PATRICK E
KING PATRICK E
Application Number:
PCT/IB2003/003801
Publication Date:
May 21, 2004
Filing Date:
August 07, 2003
Export Citation:
Assignee:
MARCONI INTELLECTUAL PTY (US)
International Classes:
G06K19/077; (IPC1-7): G06K19/077
Domestic Patent References:
| WO2002011094A1 | 2002-02-07 |
Foreign References:
| US6350791B1 | 2002-02-26 |
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