No abstract

A high-level (i.e., in terms of security) authentication method is proposed in this paper, where the chipless radio frequency identification (RFID) is extended to the chipless authentication. The proposed method is based on low cost inkjet-printed square check patterned chipless tags, whose design is explicitly optimized keeping the randomness inherent to the inkjet printing process in view. These optimized chipless tags are very difficult to duplicate, as their unique backscattered electromagnetic (EM) responses depend on the proximate coupling among the possible separated squares, which is happened naturally due to the randomness in inkjet printing. The performance of the proposed method is analyzed by a low cost impulse radio (IR) ultrawideband (UWB) chipless RFID reader as well as by the highly accurate vector network analyzer (VNA) based chipless RFID reader. The achieved probability of error is comparable to the various fingerprint evaluation campaigns found in the literature.

This work presents the designs of single-layer chipless radio frequency identification (RFID) tags based on the RF-encoding particles (REP) approach. These tags are the first realized for reading in cross-polarization resulting in a higher immunity against multipath, and thus, achieving robust readings in a practical environment. The proposed chipless tags are of credit-card size, with a frequency band of operation ranging from 3 to 6 GHz within the ultra-wideband (UWB), compliant with low-cost additive fabrication techniques, and realized with low-cost plastic and paper substrates. A study on reader-tag polarization and rotation angle is performed for the proposed designs and compared with the existing designs of two-layers. For the first time, it is presented that the low-cost single-layer tags can be read in realistic environments with only one measurement.