Design of Robust Detection System for Printable Chipless RFID Tag Alphabet Letters

This work presents a novel chipless radio frequency identification (RFID) tag design method for Latin alphabets. Unlike the traditional complicated geometry tags, this new method uses a compact printable alphabet letters which additionally offers the advantage of efficient real time recognition of the transmitted data visually along with radio frequency (RF) waves. In this study, alphabet letters (a, b and c) are realized using copper etching on thin dielectric substrate (TLX-8) backed by a ground plane. The original signature of the radar cross section (RCS) frequency response reflected by letter, displays dips corresponding to the presence of individual letters. The tag has been simulated, fabricated and measured in a mono-static radar system using Vivaldi dual polarized antenna in frequency band ranging from 6 to 13 GHz. A robust detection has been reached with very good agreement between the experimental and simulated results in both co- and cross-polarizations.