About Battery-Free RFID Wireless Sensors

Low-frequency technology is ideal for reading through liquids or solid materials – including composites such as carbon fiber.

RFID Wireless Temperature Sensor Transmitting through Carbon Fiber Demo Video

No batteries means low maintenance and long life, bringing sensor technology to previously impossible applications.
(-58°F to 340°F) Ideal for harsh environments.
Use for a MEMS pressure sensor (or other capacitive output sensor) to easily monitor multiple data.
Short read ranges can be useful in certain applications. Panel readers extend read ranges to a few feet.
Senors installed in tire valves track tire pressure and temperature.
Sensor operates with magnetically coupled antennas, which can be very small.
Operates at a low frequency of 134 KHz which can transmit through many difficult materials, including composites such as carbon fiber.

 Examples of  Low Frequency (LF) Passive RFID Wireless Sensors

Embedded Carbon Fiber Sensor (Temperature, Vacuum, Pressure)

LF RFID Passive Wireless sensor transmits through compostie material

LF RFID sensors can be so small that they can fit in the honeycomb cells of a composite structure. Since they are battery-free, they can operate for decades. The low-frequency magnetic waves travel right through the carbon fiber so the embedded sensor can be read. Watch our Demo Video & Learn More.

Rugged Battery-Free Tire Pressure and Temperature Monitoring System (TPMS)


Phase IV designed the LF RFID sensor ASIC with Crane Aerospace for use in the extremely harsh environment of aircraft wheels. See more information on the Aerospace Solutions & Demos page.

Featured in  RFID Journal.

Wireless Temperature Monitoring in Food Processing

Ideal for monitoring the internal temperature of small objects. The small mass of the sensor has minimal effect on the heating of the object being monitored.

As featured in Food Engineering journal, “The Fantastic Voyage of a Temperature Probe” , featuring a partnership between Phase IV and Campbell’s Soup.

More details on our data sheet.

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