Alternative implementations of small all-platform UHF RFID transponders

Analysis and practical implementations of small all-platform UHF RFID transponders are presented. Four prototypes that are combinations of two topologies of integrated impedance matching circuits and two fabrication methods are introduced. With printed circuit board (PCB) technology that is the first of the fabrication methods, prototypes with two and three metal layers are presented. Measurements of the prototypes showed good consistency with the simulation results, demonstrating the effects the different implementation methods have on the transponder performance. The results show that small but efficient transponders can be implemented with various techniques.