Generalized transmission-line model for estimation of cellular handset power absorption in biological tissues

Evaluation of cellular handset power absorption in biological tissues has recently received due public attention. Generally, the solution of even simple cellular phone-human head configurations, involves massive and time consuming excitation of numerical algorithms. Furthermore, an explicit dependence of numerical solution on the physical parameters as well as on the configuration geometry is usually difficult to achieve. Herein, we focus on a generalized one-dimensional transmission-line model, which is capable of establishing tight bounds and estimates on the actual power absorption and radiation for many realistic configurations. The solution is given by explicit closed-form expressions, which depend continuously on the physical and geometrical parameters of the problem and, thus, can be readily physically interpreted. The potential promise of our simplified model is numerically verified via alternative finite-difference time-domain and moment method data for cellular handsets closely coupled to human head.