Numerical Simulation Of Electromagnetic Radiation From Handset Antenna

Today the people unprecedented concerned about their health and environmental problem. In the past decades, the digital cellular telecommunication has rapidly been popularized, at the same time it is widely debated whether the electromagnetic wave emitted by the electronic equipment will hurt the human’s health. Because the antenna of a mobile handset is so near to a human head, that is situated around the field of the induction and the radiation, its radiation of the microwave might be strong enough to make some potential hazards on the head. There is an urgent requirement to have a impartial and actual evaluation of the dosage of the electromagnetic radiation. At the other hand, the FDTD-Method has the excellent performance when it is applied to predict the near-filed distribution with the complicate boundary. At this sense, the author tries to examine the SAR distribution in the human body with the FDTD method.The electromagnetic models of cellular phone and layered human head are established, the SAR distribution in human head illuminated by a monopole antenna and radiation of planar inverted-F antenna (PIFA) of handset at900MHz is calculated by the FDTD method. This thesis mainly discusses the SAR distribution in human head according to different distances between cellular phone and human head under different circumstances like using cellular phone with a pair of metal-frame glasses or next to a metal wall. The obtained results are analyzed and contrasted with the electromagnetic safety standard.The calculated results show that the distribution of the SAR in human body is of very asymmetry, the closer the mobile phone is to human head, the higher the value of SAR is. What’s more, the value of SAR in human head will increase when the person is wearing a pair of metal-frame glasses or calling next to a metal wall.