摘要
为了研究车载天线在高空核电磁脉冲(HEMP)环境中的耦合特性,结合时域有限差分方法(FDTD)的细线算法与同轴馈源电路参数模型,计算车载超短波天线的末端响应,并分析天线长度、入射角度、不同的天线布局与馈电方式等对天线末端响应量的影响规律.结果表明当入射波与天线之间的有效反射面积增大时,末端电压量也随之增大.同时同轴馈电相较于中端馈电得到的输入端电流幅值更大,衰减速度也更快.对于斜天线而言,耦合电压的峰值随着入射电场与天线方向夹角的增大而减小,但谐振频率则始终不变.当天线长度增加时,终端电压与谐振频率都随之增加.
In order to study the coupling characteristics of vehicle antenna in high altitude nuclear electromagnetic pulse environm ent,the end response of vehicle VHF antenna is calculated by using the thin wire algorithm of finite difference time domain(FD TD)and the coaxial feed model.Based on that,the variation of antenna length and incident angle,different antenna layout and feeding mode are analyzed.The variation of the response at the end of the antenna is studied.The results show that the terminal voltage increases with the increase of the effective reflection area between the incident wave and the antenna.At the same time,the input current amplitude of coaxial feeding is larger and the attenuation speed is faster than that of mid-end feeding.For oblique antenna,the peak value of coupling voltage decreases with the increase of the angle between incident electric field and antenna direction,but the resonant frequency remains unchanged.When the length of antenna increases,the terminal voltage and resonance frequency increase accordingly.
作者
赵玮
诸雪征
毛从光
ZHAO Wei;ZHU Xue-zheng;MAO Cong-guang(Institute of NBC Defense,Beijing 102205,China;Institute of Nuclear Technology,Xi’an 710024,China)
出处
《核电子学与探测技术》
CAS
北大核心
2020年第1期87-93,共7页
Nuclear Electronics & Detection Technology
关键词
时域有限差分算法
细线算法
超短波天线
高空核电磁脉冲
响应电压
finite-difference time-domain m ethod
thin wire algorithm
VHF antenna
high altitude electromagnetic pulse
response voltage
