Surface acoustic wave sensor and package
First Claim
1. A wireless and batteryless pressure sensor apparatus, comprising:
- a SAW sensor having at least one SAW die with at least one SAW resonator for measuring applied pressure and/or temperature due to change in a resonant frequency of the at least one SAW resonator;
an antenna connected to said SAW sensor such that said antenna is configured to communicate wirelessly with a remote interrogator unit, said antenna configured to receive an interrogating radio frequency (RF) signal, and to transmit an RF response from the SAW sensor back to the remote interrogator unit, the RF response including at least a measure related to the resonant frequency of the at least one SAW resonator representing at least one of pressure and temperature; and
a sensor package including a base for mounting and containing said SAW sensor and said antenna;
wherein said SAW sensor is designed in a stainless steel button package having a sensor diaphragm, and along with said sensor package, comprises a shape that is adaptable for measuring at least one of pressure and temperature.
1 Assignment
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Accused Products
Abstract
The SAW sensor in a stainless steel button package having a diaphragm and mounted on a threaded port. Package can hermetically seal a sensor and RFID-antenna assemblies from media. Sensor diaphragm is exposable to media. Sensor and RFID antennas communicate electrically with SAW sensor and RFID device, respectively, for sensor measurements and identification. Antennas receive RF interrogation signal from a nearby interrogator/transceiver and send reflected RF signals back to the interrogator unit containing sensor measurement and sensor ID. TRF signal excites a SAW resonator inside the sensor and causes the SAW to resonate wherein resonant frequency changes with pressure and temperature applied to the sensor. Antennas could be printed circuit board antennas, helical antennas, loop antennas, any other commercially available off-the-shelf antennas or a combination of these.
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Citations
16 Claims
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1. A wireless and batteryless pressure sensor apparatus, comprising:
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a SAW sensor having at least one SAW die with at least one SAW resonator for measuring applied pressure and/or temperature due to change in a resonant frequency of the at least one SAW resonator; an antenna connected to said SAW sensor such that said antenna is configured to communicate wirelessly with a remote interrogator unit, said antenna configured to receive an interrogating radio frequency (RF) signal, and to transmit an RF response from the SAW sensor back to the remote interrogator unit, the RF response including at least a measure related to the resonant frequency of the at least one SAW resonator representing at least one of pressure and temperature; and a sensor package including a base for mounting and containing said SAW sensor and said antenna; wherein said SAW sensor is designed in a stainless steel button package having a sensor diaphragm, and along with said sensor package, comprises a shape that is adaptable for measuring at least one of pressure and temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless and batteryless sensing apparatus, comprising:
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a printed circuit board; a SAW sensor package mounted or formed on said printed circuit board for receiving an interrogating radio frequency (RF) signal from a remote interrogator unit and for transmitting a SAW sensor RF response back to the remote interrogator unit, wherein the RF response includes a measure related to at least one resonant frequency for use in determining pressure and/or temperature; an RFID device mounted or formed on said printed circuit board with said SAW sensor package; at least one antenna in communication with said SAW sensor package and/or said RFID device such that said at least one antenna communicates electrically with said SAW sensor package and/or said RFID device and permits wireless and batteryless interrogation of said SAW sensor package and/or said RFID device by the remote interrogator unit; a package base for mounting said printed circuit board, the SAW Sensor package, and the RFID device; and a package cover, wherein the package cover and package base together define a cavity for housing said SAW sensor package, printed circuit board and said RFID device. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification