Numerical estimation methodology for RFID/Active Implantable Medical Device-EMI based upon FDTD analysis

A numerical estimation methodology for RFID /Active Implantable Medical Device (AIMD) EMI based upon FDTD analysis is presented. This methodology can be applied to low-band RFID. In this paper, an example for RFID interrogator in the frequency band of 13.56 MHz (ISO/IEC 18000-3 MODE 1) is shown. It assumes that RFID interrogators operating in the low or HF frequency bands might cause EMI on the AIMDs through the interference voltage induced by the magnetic flux excited by the RFID interrogator. Calculated interference voltage was compared with the EMI characteristics obtained by in-vitro EMI experiments to validate the analysis result. The estimated EMI characteristics obtained by the experiments and the FDTD analysis agreed well.