Study On Specific Absorption Rate Of Human Body Based On Parallel Higher Order Finite Element Method

Nowadays,mobile communication technology has developed increasingly maturity.Daily life and social work can not be inseparable from mobile phones.When the mobile phone is close to the human head,the electromagnetic radiation of the mobile phone is enhanced,which may have adverse effects on human health.Specific absorption rate(SAR)is widely adopted to evaluate the effects of electromagnetic radiation on human body.In recent years,with the development of electromagnetic numerical calculation methods,people have conducted more comprehensive and in-depth research on the simulation of the specific absorption rate of the human body models.However,most of the current research focuses on the complexity of human tissue structure in free space,and no in-depth study has been conducted on the electromagnetic environment in which human body is located.In this paper,the concept of SAR value and its safety standard are introduced firstly,then the basic principles and key technologies of the finite element method and the parallel finite element domain decomposition method are deduced and studied.In this paper,the parallel higher order finite element method is used to simulate and calculate the SAR value of the human body.In the case of ensuring the same accuracy as the commercial software HFSS and FEKO,the parallel finite element domain decomposition method is adopted to improve the computational efficiency and expand the calculation scale,which can deal with the human body SAR problem in more complex environment.In this paper,the distribution of electric field and specific absorption rate of human head model,human whole body model,and human body exposed to complex environment during the EM radiation from PIFA antenna.In the first part,the electric field and SAR distribution of a simple single-layer human head model filled with tissue equivalent fluid and a complex layered head model containing 7 different tissues are discussed.In the second part,we analyze the electric field and SAR distribution of three kinds of human whole body numerical simulation models: men,women and children,which are filled with the same tissue equivalent fluid.In the third part,we study the electric field and SAR distribution of the human body model when using the PIFA mobile phone antennas in the car and in the airplane.We discussed comprehensively the effects of multiple parameters on the variations of electric field and SAR.Such parameters include the internal tissues of the head models,the external structure of the human body model,the distance between the mobile phone antenna and the head,the placement angle,the input power,and the external environment.In general,the finite element method in this paper can accurately and efficiently simulate the SAR values of the human body.It is difficult for commercial software and traditional finite element algorithms to simulate the integrated simulation models of human-car and human-airplane with electrically large dimensions and fine structures.In this paper,we can expand the application range of the finite element method-domain decomposition method in the field of bioelectromagnetics.Our work has certain reference value for understanding the radiation effects of mobile phone antennas on human body.