Design of high sensitivity re-transmittable chipless tag temperature sensor based on alumina ceramic

An alumina ceramic based U-shaped slot nested re-transmitting chipless tag temperature sensor is proposed in this paper. The U-shaped nested slots are etched in the conductive layer of the top layer of the alumina ceramic. The dielectric constant of the alumina ceramic increases monotonically with temperature increase which leading to change in the resonance frequency of the U-shaped slot to produce the frequency shift. This sensor comes with an ID feature that allows for coded identification. The temperature sensing sensitivity achieves 0.5211 MHz/°C. This temperature sensor has the characteristics of high temperature sensitivity, small size, passive, and the ability to measure temperature wirelessly over long distances. It has certain application potential in the field of high-temperature wireless sensors.