SAR distribution and thermal elevation in a human head model due to the operation of the data telemetry link and implanted chip in a retinal prosthesis

In this work, we use the 3-D finite difference time domain method to investigate the microwave data telemetry link at two widely different frequencies and examine the power deposition in the head-eye tissues quantified as peak 1-g SARs for an estimated maximum transmitted power. A 3-D thermal analysis is also performed to determine the increase in the steady state temperature distribution in the head-eye tissues due to the operation of the implanted chip.