Electromagnetic Effects Analysis for Biological Tissues via Dispersive FCC-FDTD Method

A dispersive face-centered cubic finite-difference time-domain (FCC-FDTD) method is proposed for analyzing electromagnetic effects in biological tissues in this article, where biological tissues are dispersive media described by the Debye model. To simplify the derivation and improve accuracy, the auxiliary differential equation (ADE) technique is incorporated into the FCC-FDTD method updating formulas, and the convolutional perfect matched layer (CPML) for the dispersive FCC-FDTD method is developed. Then, the stability of the dispersive FCC-FDTD method is investigated for solving the four-term Debye dispersive model. Three numerical examples, pulse propagation in Debye medium, pulse propagation in multimedia, and the electromagnetic energy absorption of the four-layer spherical head phantom, are used to validate the performance of the dispersive FCC-FDTD method. Considering the dispersive properties of biological tissues, the proposed method is used to analyze the electromagnetic effects of the human brain under broadband radiation. The results show that there are differences in the absorption of electromagnetic energy for different biological tissues, and the electromagnetic effects of the human brain are influenced by age and gender. As a result, the proposed method can more accurately evaluate the effects that electromagnetic radiation causes on organisms and serve as a reference for their electromagnetic safety to make further targeted protection research.