In vivo dielectric properties of human skin from 50 MHz to 2.0 GHz

The authors report in vivo complex permittivity measurements of human skin using the open-ended coaxial line sensor technique. The results indicate that considerable differences exist between the skin complex permittivities obtained from different regions of the body. The in vivo dielectric properties of skin are found to depend for reproducibility upon the pressure and length of time of sensor application. Variations between individuals could also be significant. The potential biomedical uses of this technique are briefly discussed.