Analysis of power absorption by human tissue in deeply implantable medical sensor transponders

The use of sensor transponder systems in medicine opens valuable possibilities in therapy and diagnostics. This chapter is about physical effects by the use of sensor transponder technology for medicine applications, especially for deeply implanted passive powered sensor transponders. This chapter will inform about present and future applications. The influence of human body on the energy transmission in a sensor transponder system is shown. The dielectrical properties of human tissue are discussed. A way how to estimate losses in an analytical way and with the use of a 3D FTDT method is presented. Finally, a design example of an energy transmission for a sensor transponder is shown with a calculation of the optimal frequency and experimental results.