介质中的电磁能量损耗及其应用

利用麦克斯韦方程组导出了在简谐交变外场中,电磁能量损耗的功率密度表达式,该损耗功率密度由介质的相对介电常数的虚部、磁导率的虚部、外场频率和外场的强度决定.并根据电磁能量损耗分析了微波加热原理,得到了微波场中的热能平衡方程.不仅有助于提高人们对电磁场与物质相互作用的认识,且对相关的理论研究和技术应用有一定的指导意义.

Electromagnetic energy loss in medium and its application

The power density of electrom agnetic energy loss is deduced from the Maxwell’s equations,which is dominated by the factors as the imaginary component of relative dielectric constant,of magnetic permeability,external field frequency and the square of field strengt h.Based on the electromagnetic energy loss,we analyze the principles of micr o wave heating,and present the thermal energy balance equation in microwave fie ld.This work contributes to improve the understanding of interactions between t he electromagnetic field and material,and has some directive meanings to the r elative theory research and technological applications.