瞬态电磁脉冲能量传输特性的物理实质  

Physical essence of energy transmission characteristics of transient electromagnetic pulse

作　　者：孙云卿[1] 杨宏春[1] 

机构地区：[1]电子科技大学物理电子学院,四川成都610054

出　　处：《电波科学学报》2010年第2期323-329,共7页Chinese Journal of Radio Science

摘　　要：根据矢量位方程,在均匀电流模型下,分别给出了圆形和方形单元天线轴线上电磁场分量的时域表达式以及能量密度的解析计算公式;用等腰梯形电脉冲给天线馈电,采用数值计算的方法分别绘出了圆形和方形天线轴线能量密度随距离的衰减曲线,瞬态电磁脉冲能量传输呈现"三段式"传输规律和慢衰减特性;通过对能量密度解析计算公式物理意义的讨论,给出了瞬态电磁脉冲慢衰减传输特性的物理实质解释;采用亚纳秒电子源给抛物面天线馈电,对抛物面天线轴线辐射电磁脉冲波形及能量作实验测试,实验测试结果与数值计算结果相符合。According to the vector potential equation,analysis formula of axial field component and the energy density of electromagnetic pulse radiated by disk and planar square antenna were derived separately based on the uniform current distribution model.The curves of axial energy of round and square planar radiator were mapped by the numerical results of energy density formula under the condition of isosceles trapezoid.Transient electromagnetic pulse energy transmission present ＂three-stage＂ transfer rules and slow decay characteristics.The physical essence of the slow-decaying property of transient electromagnetic pulse be offered through discussion of physical meaning of the energy density analytical formula.Experimental test of electromagnetic pulse and the energy density on the axis have been done by the parabolic antenna fed with sub-nanosecond pulse power.The experimental results well agree with the numerical ones.

关 键 词：瞬态电磁脉冲 慢衰减特性 物理实质 实验验证 

分 类 号：TN015[电子电信—物理电子学] O441.1[理学—电磁学]