Screen printed chipless wireless temperature sensor tag based on Barium Strontium Titanate thick film capacitor

The paper describes the development of a demonstrator for a chipless wireless temperature sensor tag operating in the ultra-wideband (UWB) spectrum. For temperature measurement, the backscattered time domain response is analyzed. Specific in this work is, that with the use of an Alumina substrate and screen printing layer deposition, the fabrication technology has been chosen to enable high temperature operation. The development of this demonstrator requires a dedicated RF tag design, particularly for the antenna, and the application of profound knowledge of the Barium Strontium Titanate (BST) material system which is the basis of the transducer. Measurements confirm the tag´s functionality, but reveal limits of the particular design as well.