A new model for transmission line modelling (TLM) method to investigate frequency-dependent bioelectromagnetic interactions

In this article, a new transmission line model is presented for frequency-dependent analysis of bioelectromagnetic interactions. For the frequency-dependent analysis, the transmission line is modelled with dependent voltage sources in PSpice, allowing the transmission line lumped parameters to be defined as functions of frequency. This approach enables frequency-dependent analysis with a single simulation. As an example, the frequency-dependent electric field distribution in a multilayer human tissue model for the frequency range of 1 GHz and 100 GHz is investigated. The multilayer tissue model consists of skin, fat, and muscle layers. A finite element method (FEM)-based analysis of the electric field distribution in the multilayer tissue model is also conducted at the resonant frequency of the model, determined in this study to be 10.44 GHz. The TLM and FEM-based results are in good accordance. Additionally, the skin depth of the multilayer tissue model is calculated. The results from both the electric field distribution analysis and the skin depth calculation confirm the accuracy of the proposed frequency-dependent transmission line model. Finally, the study examines the frequency-dependent electromagnetic energy absorption in the multilayer tissue model across the 1 GHz to 100 GHz frequency range.