ENVIRONMENTALLY SENSITIVE MULTI-FREQUENCY ANTENNA
First Claim
1. A transponder, comprising:
- a wireless communication circuit;
at least one tab forming an antenna associated with the wireless communication circuit operative at a first frequency; and
a temperature sensitive adhesive associated with said at least one tab such that when exposed to a temperature above a predetermined threshold, the temperature sensitive adhesive melts.
1 Assignment
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Accused Products
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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Citations
28 Claims
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1. A transponder, comprising:
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a wireless communication circuit;
at least one tab forming an antenna associated with the wireless communication circuit operative at a first frequency; and
a temperature sensitive adhesive associated with said at least one tab such that when exposed to a temperature above a predetermined threshold, the temperature sensitive adhesive melts. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of wirelessly communicating information, comprising:
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adhering the transponder to a substrate delimiting a slot with a temperature sensitive adhesive;
coupling the transponder to the slot to form a slot antenna;
communicating at a first frequency using the slot antenna; and
communicating at a second frequency when the transponder has been exposed to a temperature above a predetermined threshold that causes the temperature sensitive adhesive to melt, thereby decoupling the transponder from the slot. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for determining if a transponder has been exposed to a temperature above a predetermined threshold, comprising:
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a substrate delimiting a slot;
said transponder comprising a pair of tabs coupling the transponder to said slot to form a slot antenna operative at a first frequency;
said transponder secured to said substrate by a temperature sensitive adhesive such that exposure to a temperature above the predetermined threshold melts the temperature sensitive adhesive, decoupling the transponder from the slot and causing the tabs of the transponder to act as an antenna at a second frequency. - View Dependent Claims (16, 17, 18)
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19. A transponder, comprising:
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a wireless communication circuit;
at least one tab forming an antenna associated with the wireless communication circuit operative at a first frequency; and
a resilient material associated with said at least one tab such that when exposed to a pressure below a predetermined threshold said resilient material expands. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of wirelessly communicating information, comprising:
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securing the transponder to a substrate delimiting a slot with a resilient material;
coupling the transponder to the slot to form a slot antenna;
communicating at a first frequency using the slot antenna; and
communicating at a second frequency when the transponder has been exposed to a pressure below a predetermined threshold that causes the resilient material to expand, thereby decoupling the transponder from the slot. - View Dependent Claims (26, 27, 28)
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Specification