HFSS软件边界条件和网格剖分技术适用领域

Application of HFSS software in boundary conditions and meshing technology

为了研究以天线作为射频辐射源的生物电磁学问题,运用基于有限元法的三维高频结构仿真软件(HFSS)仿真手机天线对人头组织辐射模型和地铁司机职业电磁暴露模型,分析电小尺寸模型和电大尺寸模型中辐射边界条件和完美匹配层的设置对仿真结果的影响。通过对比已有文献中时域有限差分法对该模型的仿真结果,验证采用厚度为λ/2的完美匹配层作为边界条件的可靠性;结合仿真结果的精确度、网格剖分数和计算速度,说明天线近场辐射问题中电小尺寸模型应该选择二阶基函数进行网格剖分,电大尺寸模型应该选择混合阶基函数。

Aiming at studying the bioelectromagnetism problem of using antenna as a radio frequency radiation source,by using 3-dimensional electromagnetic simulation software(High Frequency Structure Simulator,HFSS)based on Finite Element Method(FEM),the model of influence on human head exposuring to the radiation caused by the mobile antenna,and cab's driver occupational electromagnetic exposure model of subway are simulated.The influence of the settings of radiation boundary condition and Perfect Matching Layers(PML)on the accuracy of the simulation results in electric small size model and electric large size model is analyzed.Comparing with existed literature's simulation results of time domain finite difference method,the reliability of perfect matching layers with thickness ofλ/2 as the boundary condition is verified.Combining the accuracy of the simulation results,the number of grid segmentation and the speed of calculation,it is indicated that the antenna near-field radiation problem of electric small size model should choose the second-order basis function for grid mesh,and electric large size model should choose the mixed basis function for grid mesh.