Linear Time-Variant Chipless RFID Sensor

In this paper, we present the first chipless sensor which does not satisfy definition of a linear time-invariant system. This rotational is able to break time-invariance classically associated with technology by modulating reflected power in time domain. As result, backscatter at frequency different one used reader and function speed. A new identification scheme based on modulated backscattered tag signal also introduced allows identify tags. Coding capacity has been evaluated 11 bits probability correct detection 98%. Linear time-variant systems allow simplify architecture, read multiple tags increase range for both sensing identification. We show that proposed could be distance higher than 10 m. result outperforms classical factor 30.