Investigation of distribution of electromagnetic fields inner biological objects

Attention to the study to determine the degree of influence of electromagnetic effects on the user is increased by the expansion of the functionality of mobile communications and a significant increase in the time of their subscribers use throughout the day. Creating adequate electrodynamic model of biological tissue to study the influence of electromagnetic waves due to the necessity of solving the problem of the excitation of the electromagnetic wave in a dramatically changing parameters (skin, muscle, bone, fat tissue). This characteristic inhomogeneity are comparable to the wavelength or smaller than it, which is why the use of the approximate number of asymptotic methods for solving the corresponding model problems is practically impossible. A rigorous method for computing field inside a person can be done only on the basis of three-dimensional modeling of a biological medium with arbitrary parameters of the permittivity and conductivity, which lies at the limits of the most modern computer technology. Studies conducted for electrodynamic simplified models of biological tissue, in particular, the model is represented as a multilayer medium with flat layers, and a multilayer of a sphere or ellipsoid. For a description of the head model are more preferred model constructed on the basis of multilayer spheres or ellipsoids, which are located within the volume of a more complex configuration, which describes the brain. Modeling using the scope is particularly advantageous and widely used, allowing to perform a primary SAR estimation by the example of the multi-layer sphere. Research work carried out using a three-layer model of the human head in the form of an ellipsoid of revolution with a truncated ellipsoid inside to describe the human brain and two cell phone models with a microstrip antenna and a spiral antenna. Distribution Calculations of electromagnetic fields and SAR performed in FEKO program. These results suggest that the spatial peak SAR averaged over 10g/cm
³
model of the human body are obtained below the threshold recommended by international standards. Increasing the distance between the mobile device and the head can be significantly reduced SAR levels. In this case, however, there is no change in position of the region where the peak SAR values are reached.