Chipless sensors have no onboard chip, they require no active power and can be manufactured at a very low cost. The data received by the reader is purely an analog signal representing the electromagnetic response produced by the material active layer and the external stimulus (such as temperature, pressure, humidity, etc).

An RFIC/RFID tags & sensors company Tagsense offers various chipless sensor technologies including:

  • Planar LC resonators with active dielectrics (for temperature, pressure, humidity, light, pH, etc.)
  • Magneto-elastic resonators and harmonic magnetic materials (for temperature, pressure, humidity, light, pH, etc.). This family of sensors also includes an irreversible temperature sensor, which permanently changes state even if the temperature is cycled.

Source: Tagsense