Inverted Frequency-Coded Chipless RFID Tag Design Methodology Based on Parameter Optimization

Frequency-coded chipless radio frequency identification (RFID) tag design frequently suffers from the mutual coupling effect among resonant components, which causes the frequency shifting phenomenon. It is very difficult to thoroughly resolve this problem because of design requirements, such as high capacity and limited space on a single tag. In this letter, a novel design method based on particle swarm optimization (PSO) in combination with empirical Taguchi method (TM) is proposed. With this methodology, the optimal design parameters are automatically searched and fitted to comply with the resonance requirements at the given encoding frequencies. The proposed method was demonstrated with the design process of an I-shaped slot tag structure.