Analysis Of Mobile Phone Radiation In The Electromagnetic Field And Improvement Of The Antenna

Due to the rapid intensification in the use of mobile phones, there has been a recent increase in public concern regarding the exposure of humans to radio frequency electromagnetic radiation.Along with that the investigation about the radiation of phone has become predominance. The antenna is very closely to our hands when we use handsets, so the electromagnetic radiation has inevitable potential hazard to human. Therefore, the electromagnetic radiation of the handset antenna and its shielding are the important themes of the research.At present, the specific absorption rate is the recognized values of human body measurement of electromagnetic radiation, but it is not unity. The aim of this paper is to provide supports for the unity of the standard.In this research, Two models for mobile phone a monopole and a Planar Inverter-F antenna and a simple model for head were considered. For analysis the Specific Absorption Rate the Finite Difference Time Domain method is employed to verify simulation results. The investigation shows the SAR distribution that for 900MHz and 1800MHz at 1cm,2cm,3cm distance.Comparing the SAR in two antennas, we can found that the SAR of the Planar Inverter-F antenna is smaller. In this paper, adding shielding for PIFA at 900MHz in 1cm, in this case analysis the distribution of Specific Absorption Rate.Comparing the value and the distribution of SAR in this paper, we can conclude:(1)At the same temperature, the radiation of PIFA is much smaller than that comes from monopole antenna. For example: When the distance is 1cm from the antenna to the head at 900MHz,the Max 1g average SAR of PIFA is much smaller than that of monopole.(2)The radiations on the head that come from PIFA and monopole antenna have common law: With the distance increasing, the radiation reduced.(3)After using the shielding in PIFA, the value of SAR is significantly low, different materials have different ability of radiation.The results of this study should be further proved because of the limitation of time and knowledge. It is only the preliminary exploration on the electromagnetic radiation, and provides some basis for the future study.