Time-efficient Reading Process for Motion-modulated Chipless RFID

This paper presents a multi-carrier reading process which can significantly reduce the identification time for motion-modulated chipless tags. The performance of the proposed approach is experimentally compared with the previously presented single-carrier method in terms of identification time, SNR, and achievable read range. The measurements are done for the proposed directional-Doppler modulated chipless tag consisting of rotating high resonant loop scatterers. Using the multi-carrier reading method, the identification time is reduced by a factor of 2.5 while maintaining a read range of several meters.