Research Of Simulation On The Interaction Between The Human Head Model And Dual-Frequency PIFA Antenna

The simulations are important in the electromagnetic dose field. It is also practical,because more and more people are concerning about the effects of the electromagneticradiation from the mobile phone on the health of the human beings.According to the real operating case, this paper will investigate thoroughly tomodeling of cellular phone and human body system, on this foundation, and process aseries of numerical simulation task. The main contents are displayed bellow as:First, this paper introduces the latest development of bio-electromagnetism, anddiscusses the biology thermal, non-thermal of the electromagnetic field and its biologymechanics. The application of some numerical computation technologies such as FDTDin the research of electromagnetic field is particular expanded.Next, the design of a novel single-feed dual-band planar inverted-F antenna (PIFA)is presented. This antenna operating at 900MHz and 1800MHz bands is suitable forGSM 900/1800 systems. The impedance bandwidths for -10dB return loss bands aregreater than 10%.Then, by Photoshop dealing with Magnetic Resonance Image and by the person'smodel analysis, the heterogeneous electromagnetic model of people's head aboutdifferentiations ratio of 0.3cm is set up.Last, by using the algorithm of FDTD, and the electromagnetic model of mobiletelephone and people's electromagnetic model, the distribution of SAR of people's headin near field intensity in the dual-band antenna of mobile telephone which is exposed inthe SAR peak value and average value is calculated. Compared with the Chinese andinternational criterions, the results have been analyzed. A comparison to verticaloperation case is also analyzed. The results show that the electromagnetic radiation canbe decreased under tilted condition.Simulation results show that the distribution of absorption dosage ofelectromagnetic radiation to human body is of very asymmetry. It was also found thatthe highest SAR areas were the body surface near the antenna. It is concluded that theantenna feed point draw nearer, SAR values higher.