多次反射对垂直磁偶极子的场强影响  

Contribution of Multiple Reflections Waves to Vertical Magnetic Dipole

作　　者：张立琛[1] 王英民[1] 郭拓[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第5期944-948,953,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目资助(批准号:61401362)

摘　　要：如何快速准确地计算分层导电媒质中环天线产生的电磁场一直受到人们的重视.文中利用镜像法,在空气-海水-海床三层模型下,在电磁场惟一性原理的基础上,通过矢量电位方法推导了垂直磁偶极子在海水中产生的极低频电磁波的解析表达式.通过该方法推导出的电磁波表达式各个分量有明确的物理意义,且推导过程更加简单.仿真结果表明,海面和海底之间的多次反射波对总场场强的贡献很小,可忽略不计;对总场场强起主要作用的传播路径为:从场源发出以最小距离到达最近分界面经一次反射直接到达接收点.Great attention is paid to calculating conveniently the electromagnetic field due to a loop an‐tenna buried in stratified media .In the three layers model of air‐sea water‐seafloor ,the analytical ex‐pressions of extremely low frequency electromagnetic wave produced by a vertical magnetic dipole source located in seawater have been derived in the space of seawater by using the mirror image theory according to the uniqueness theorem of electromagnetic field .The physical meaning is more apparent , and the derived formula is more convenient through this method .The simulation results show that surface wave plays a main role on the electromagnetic field intensity of far‐field ,the contributions of multiple reflections waves can be ignored ,The propagation path played a major role for the total in‐tensity is that the wave which is emitted from source reachs to the nearest interface at s minimum dis‐tance ,then directly reachs to the receiving point through a reflection .

关 键 词：镜像法 三层模型 垂直磁偶极子 极低频 多次反射波 

分 类 号：O451[理学—无线电物理]