Time-Variant and Non-Linear Transponders for Identification and Sensing
Nicolas Barbot · HAL (Le Centre pour la Communication Scientifique Directe) · 2023
This manuscript presents two new directions to realize the function of identification and sensing using radio frequency signals. These techniques are able to break the time invariance and/or the linearity of the transponders and can be seen as a clear opposition to the classical paradigm used in the RFID chipless technology. The first direction addresses transponders which can break the time-invariance property by modulating their backscattered field. Four principles are investigated such as load modulation, doppler modulation, polarization modulation and radiation pattern modulation. The second direction focuses non-linear transponders which can break the linearity property. Two techniques are presented based on the harmonics response and the non linear modulation of the transponders. Linear time-variant and non linear transponders offer interesting properties to realize both identification and sensing. Finally these transponders are characterized by a read range and a coding capacity which can outperform by a factor 30 the ones associated to the chipless technology.