Wireless sensor antenna configuration
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United States of America Patent
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May 27, 2008
Grant Date -
Jun 14, 2007
app pub date -
Dec 13, 2005
filing date -
Dec 13, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Many sensors could be used in a passive wireless mode. These include RLC, acoustic wave and magneto-elastic sensors. These types of sensors are designed to exhibit a change in fundamental frequency when exposed to environmental factors such as temperature, pressure, or chemicals. An interrogation circuit can inductively couple to the sensor and measure the change in fundamental frequency. The change can be used to measure the environmental factor. Sensor sensitivity and inductive coupling efficiency can be competing design constraints. A driver, electrically connected to the sensor and inductively coupled to the interrogation circuit, can relax the constraints. The driver, however, can introduce noise into the sensor. The sensor can be shielded using physical and geometric techniques to reduce the noise.
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