Chipless RFID Based on Micro-Doppler Effect

This article demonstrates how motion effect can be exploited to read moving chipless radio frequency identification (RFID) tags at larger distances compared what has been reached without taking into account the movement. According Doppler effect, due time-variant behavior of tags, tag backscattered field contains components different from those that are transmitted. These motion-induced utilized efficiently detect large distances, in a real environment composed stationary objects. A circuit-based analytical model verified by full-wave simulations is presented effectively predict quasi-stationary scatterers, with fast computation process. The developed analytic applied rotating dipole scatterers and used design including an identifier. In terms identification, good agreement observed between measurement results predicted model. Finally, range enhancement proven experimentally where readable up several meters.