双指数源激励下垂直电偶极子产生的极低频近场  

Near-field propagation of ELF wave excited by double-exponential function

作　　者：许红蕾 顾婷婷[2,3] 朱勇 韦笑 李粮生 殷红成 XU Honglei;GU Tingting;ZHU Yong;WEI Xiao;LI Liangsheng;YIN Hongcheng(Science and Technology on Electromagnetic Scattering Laboratory,Beijing 100854,China;Zhejiang University,Hangzhou 310027,China;The State Key Laboratory of CAD&CG,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]电磁散射重点实验室,北京100854 [2]浙江大学,杭州310027 [3]浙江大学CAD&CG国家重点实验室,杭州310058

出　　处：《电波科学学报》2021年第1期81-86,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(62001020),国家重点研发计划课题(2020YFC2201303)。

摘　　要：针对雷电过程在地面产生的近区极低频电磁脉冲,推导出了双指数模型激励下垂直电偶极子产生的极低频电磁场的瞬态近似表达式.该方案基于Sommerfeld积分在准静态近似下求解,从频域出发,利用单位脉冲响应的近似结果与双指数模型激励源卷积计算的方法,通过傅里叶逆变换,得到了双指数源激励下的瞬态解析表达式,其可用于模拟雷电信号产生的极低频电磁脉冲在空间传播的时频响应特性.本文模型为雷电过程中近区产生的电磁干扰等问题的研究提供了一种简单且有效的估算方法.In the present study,the transient approximate formulas for ELF electromagnetic field excited by a double exponential function are derived due to a vertical electric dipole on the ground at near distances representing a lightning discharge process.The approximate solution is obtained from simplifying the Sommerfeld’s integrals with the quasi-static approximation.The computational scheme,simulating the characteristics of time-and frequency-responses for ELF wave representing the lightning pulse signals,exploits the results of an approximate unit impulse response from frequency domain and convolution of which with a double exponential exciting function,and provides with the analytical transient expression of the ELF waves from the inverse-Fourier-transformation.The study illustrates a simple but effective estimation for the lightning pulses in the near region in the application of electromagnetic compatibility systems.

关 键 词：双指数激励源 极低频近场 垂直电偶极子 平面半空间 雷电脉冲信号 

分 类 号：O441.4[理学—电磁学]