Calculation of Debye parameters of single Debye relaxation equation for human skin in vivo

At microwave and millimeter-wave frequencies, the complex permittivity data can be fitted to the single Debye relaxation equation for biological materials. A simple and explicit method is used with complex permittivity data to obtain low-frequency permittivity (ε_s), and relaxation time (τ) by assuming high-frequency permittivity (ε_∞). It is found that the fitted values of Debye parameters (ε_s and τ) for the palm region of human skin in vivo are very different from those reported earlier. Also, ε_s value for the sole region of human skin in vivo is significantly lower than the palm region of human skin in vivo. This is due to lower water content in the sole region as compared with the palm region.