Surface acoustic wave sensor and package
First Claim
1. A wireless and batteryless pressure sensor apparatus, comprising:
- a SAW pressure sensor for sensing an applied pressure of interest, the SAW pressure sensor receiving an interrogating radio frequency (RF) signal from a remote interrogation unit via a first antenna, wherein a resonant frequency of the SAW pressure sensor changes with the applied pressure;
the first antenna provided on a printed circuit board and connected to said SAW pressure sensor;
an RFID device;
a second antenna connected to the RFID device, the second antenna also provided on a printed circuit board;
a sensor package base having an input pressure port that is in fluid communication with the SAW sensor for exposing the SAW sensor to the applied pressure of interest; and
a sensor package cover coupled to the sensor package base, the sensor package cover and the sensor package base together define a cavity that houses the SAW pressure sensor, the RFID device and the first and second antenna.
2 Assignments
0 Petitions
Accused Products
Abstract
A wireless and batteryless pressure sensor apparatus comprises of a SAW sensor and an antenna mounted on a printed circuit board. Optionally, and RFID tag in used in combination with the SAW sensor. A sensor antenna and a RFID antenna can be located on the printed circuit board such that the antennas communicate electrically with the sensor and the RFID device. The sensor can be interrogated utilizing a radio frequency, which is used to excite a SAW crystal inside the sensor. The interrogation signal causes the SAW to resonate wherein a resonant frequency changes with the pressure and temperature that is applied to the sensor. An interrogator can receive a return (echo) signal representing a change in SAW sensor properties (e.g., diaphragm change). A printed circuit board can be mounted on a stainless steel port and overpackaged with standard processes for hermetically sealing the sensor, or sensor and RFID device with at least one antenna.
40 Citations
20 Claims
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1. A wireless and batteryless pressure sensor apparatus, comprising:
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a SAW pressure sensor for sensing an applied pressure of interest, the SAW pressure sensor receiving an interrogating radio frequency (RF) signal from a remote interrogation unit via a first antenna, wherein a resonant frequency of the SAW pressure sensor changes with the applied pressure; the first antenna provided on a printed circuit board and connected to said SAW pressure sensor; an RFID device; a second antenna connected to the RFID device, the second antenna also provided on a printed circuit board; a sensor package base having an input pressure port that is in fluid communication with the SAW sensor for exposing the SAW sensor to the applied pressure of interest; and a sensor package cover coupled to the sensor package base, the sensor package cover and the sensor package base together define a cavity that houses the SAW pressure sensor, the RFID device and the first and second antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless and batteryless sensing apparatus, comprising:
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a printed circuit board; a Surface Acoustic Wave (SAW) sensor package including a SAW sensing element, said SAW sensor package mounted on said printed circuit board for receiving an interrogating radio frequency (RF) signal, wherein a resonant frequency of the SAW sensing element changes with at least one of pressure and temperature; an RFID device mounted on said printed circuit board with said SAW sensor package; at least one antenna electrically in communication with said SAW sensor element and/or said RFID device that permits wireless and batteryless interrogation by a remote transceiver; a package base for mounting said printed circuit board; and a package cover coupled to the package base, wherein the package cover and the package base together define a cavity that houses the SAW sensor package, the RFID device, the printed circuit board and the at least one antenna. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for wirelessly sensing conditions, comprising:
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providing a printed circuit board having a surface acoustic wave (SAW) sensor package including a SAW sensing element, the SAW sensor package configured for receiving an interrogating radio frequency (RF) signal wherein a resonant frequency of the SAW sensing element changes with an applied pressure and/or temperature; providing at least one antenna electrically in communication with said SAW sensor element that permits wireless and batteryless interrogation by a remote transceiver; and providing a package base for mounting said printed circuit board and a package cover, wherein the package cover and the package base together define a cavity that houses the printed circuit board including the SAW sensor package, and the at least one antenna. - View Dependent Claims (18, 19, 20)
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Specification