Title :
A Robust Differential-Amplitude Codification for Chipless RFID
Author :
Costa, Filippo ; Genovesi, Simone ; Monorchio, Agostino ; Manara, Giuliano
Author_Institution :
Dept. of Inf. Eng., Univ. of Pisa, Pisa, Italy
Abstract :
A novel robust encoding mechanism for spectral-domain chipless tags is proposed. The idea is based on storing information in a passive resonator by using a differential backscattering coding. This is achieved by subtracting multi-resonant slightly frequency-shifted amplitude responses obtained along vertical and horizontal polarization. The encoding mechanism is demonstrated by using a tag formed by a periodic surface patterned on a conductor-backed substrate. The unit cells of the periodic surface are formed by three concentric square loops loaded with asymmetric stubs. The resonant peaks are shifted finely and independently from each other by simply changing the length of the stubs. The reliability of the proposed encoding mechanism is experimentally verified by prototyping some samples of the tags on low-cost FR4 boards.
Keywords :
backscatter; encoding; polarisation; radiofrequency identification; reliability; resonators; FR4 boards; asymmetric stubs; chipless RFID; concentric square loops; conductor-backed substrate; differential backscattering coding; frequency-shifted amplitude responses; horizontal polarization; passive resonator; periodic surface; robust differential-amplitude codification; robust encoding mechanism; spectral-domain chipless tags; vertical polarization; Electromagnetic wave absorption; Frequency selective surfaces; Metamaterials; RFID tags; Radiofrequency identification; Chipless RFID; electromagnetic absorbers; frequency selective surfaces (FSS); metamaterials; radio frequency identification (RFID);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2015.2496791
