A Comparison of Analytical and Numerical Implanted Spherical Head Model

Despite the specific precautionary measures suggested in the media including hands-free operation of mobile phones, use of shields, limiting the duration of mobile phone usage, and choosing a mobile phone that emits a lower level of RF radiation, concerns over the possible harmful effects of non-ionizing irradiation upon implanted biological systems have been present for many years. Key issues to address are the questions of whether mobile phones have a detrimental effect on implants, and how the interaction of the handset with the body can be minimized both to alleviate public fears and to improve handset antenna performance and new implant designs. This work presents an analytical and numerical investigation of the scattering of an electromagnetic (EM) wave from a perfectly conducting implant (a cylindrical wire and a very thin cylindrical disk) of electrically small radius (of resonant length), embedded eccentrically into a dielectric spherical head model. A dyadic Green's function (DGF) for spherical vector wave functions is used. Analytical expressions for the scattered fields of an implant embedded head model is obtained. Numerical results from analytical expressions are computed for this problem and then compared with the results from the same model using the Finite-Difference Time-Domain, EMU-FDTD electromagnetic simulator.

Keywords:

• electromagnetic
• scatterer
• head model
• spheres
• circular cylinder
• implant
• dipole
• mobile phone
• dyadic Green's function