Liquid modulated antenna
First Claim
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1. A device for detecting a change in conditions comprising:
- an RFID circuit, having an antenna, mounted to a substrate;
a fluid-filled cell co-located on the substrate and separate from the antenna; and
a passage for allowing the fluid inside the cell to flow from the cell onto the antenna to alter the response from the RFID circuit when the fluid flows out of the cell and onto the antenna.
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Abstract
One embodiment of a liquid-modulated antenna using an antenna of a type commonly used in the field of wireless identification which is placed within sufficient proximity of a source of liquid to allow the liquid to flow onto the antenna, thereby altering (modulating) the characteristics of the signal being transmitted from the antenna to a signal receiving unit.
7 Citations
19 Claims
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1. A device for detecting a change in conditions comprising:
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an RFID circuit, having an antenna, mounted to a substrate; a fluid-filled cell co-located on the substrate and separate from the antenna; and a passage for allowing the fluid inside the cell to flow from the cell onto the antenna to alter the response from the RFID circuit when the fluid flows out of the cell and onto the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 12)
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7. A method of forming an fluid detecting device, comprising:
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forming an RFID circuit, having an antenna, onto a substrate; co-locating a fluid-filled cell on the substrate and separate from the antenna; and forming a passage between the fluid in the cell and the antenna to alter the response from the RFID circuit when the fluid flows out of the cell and onto the antenna. - View Dependent Claims (8, 9, 10, 11)
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13. A system for detecting a change in conditions, comprising:
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an RFID circuit, having an antenna, mounted to a substrate; a fluid-filled cell co-located on the substrate and separate from the antenna; a passage for allowing the fluid inside the cell to flow from the cell onto the antenna to alter the response from the RFID circuit when the fluid flows out of the cell and onto the antenna; and a reader for interrogating the RFID circuit and determining an abnormal condition when the response from the RFID circuit antenna indicates that fluid has flown onto the antenna. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification