Power Comparison between a Mobile Phone Operated at 1.8 GHz and 900 MHz near a Metal Wall

In general, many people believes that using a mobile phone close to a metal wall is harmful and the operating at 1.8 GHz give the higher average power absorbed than those operated at 900 MHz. In the same way, the health questionnaire via the Internet archive covers these two questions. Then, the purpose of this research was to comparison average power absorbed in a realistic model of the head which were operated at two frequencies. To clarify this issue, the researchers used finite-difference time-domain (FDTD) simulation to examine a heating effect from using a mobile phone at two frequencies near a metal wall. For each operating frequency, the distance between the antenna and a metal wall was increased. Also, a high-resolution human head model which was created by MRI-Scan has been located at 1 cm next to the antenna. In all of the head models, seven tissue types were identified: skin, bone, muscle, fat, eye, brain and blood. Furthermore, the perfectly matched layer (PML) was utilized to act as an absorbing layer and was backed by perfect electric conductors. As the simulation results, the total average power absorbed in the human head will suggest that using a mobile phone which was operated at 1.8 GHz give the total average power absorbed lower than those operated at 900 MHz