Efficient Antenna Design of Inductive Coupled RFID-Systems With High Power Demand

In contrast to pure identification labels, passive inductive coupled RFID transponders with enhanced functionality have an increased power consumption. A non-optimized antenna design for high power transponders may lead to a poor efficiency and high magnetic field emissions. Therefore, in this work, the energy transmission of inductive coupled systems is investigated, enabling an optimized system design. The RFID system is modeled by network elements in order to optimize the energy transmission. Next to a brief review of different methods for the antenna parameter determination, a new modification of the PEEC method is derived enabling an accelerated and accurate computation of the mutual coupling of the reader and the transponder antenna.