基于FDTD的时变等离子体中电磁波频域特性研究  

Analysis of frequency characteristics of electromagnetic wave for time-varying plasma by using FDTD method

作　　者：杨利霞[1] 于萍萍[1] 郑召文[1] 周祥[1] 

机构地区：[1]江苏大学通信工程系,江苏镇江212013

出　　处：《系统工程与电子技术》2013年第6期1148-1154,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金面上项目(61072002);高等学校博士学科点专项科研基金(20093227120018);江苏省第八批次"六大人才高峰计划"项目资助课题

摘　　要：推导了计算一维时变磁化等离子体的时域有限差分(finite difference time domain,FDTD)的递推式,分析了一维情况下的时变等离子体中电磁波的频域特性,并通过选取算例,验证了该方法的准确性。对将等离子体频率按时间分为3个阶段的复杂情况进行了计算分析,通过改变时变磁化等离子体占空比,得出了时变磁化等离子体对电磁波有频率漂移和频谱展宽等规律。The finite difference time domain （FDTD） formulas for one-dimensional time varying plas ma are deduced. Characteristics of electromagnetic wave in the time-varying plasma of one-dimensional ca- ses are analyzed. The accuracy of the FDTD method is proven to be correct by the comparison of numeri- cal results and theoretical analysis. The complex issue that the plasma frequency is divided into three time-accordantly stages is also calculated by the modified method. By the comparison of electromagnetic wave in time-varying plasma with different duty cycles, the conclusions of frequency drift and spectral broadening are obtained.

关 键 词：时域有限差分方法 时变等离子体 频率漂移 占空比 

分 类 号：P354.4[天文地球—空间物理学]