摘要
针对辐射式核电磁脉冲模拟器采用TEM喇叭天线作为辐射天线时低频辐射能力有限的问题,对板型和线型两种基本形式的TEM喇叭天线进行了分析。在采用线型TEM喇叭天线以减轻模拟器重量的基础上,在天线末端采用螺旋线结构,并增加屏蔽板回路,构造了一种新型TEM喇叭天线。结果表明:与普通线型TEM喇叭天线相比,该新型天线较大地提高了低频辐射性能,可使近场波形脉宽提高7ns左右,峰值场强提高了1kV/m左右;通过增大螺旋线半径和提高螺旋线密度可以提高峰值场强,增加近场波形脉宽;通过屏蔽板回路可以降低反射波纹的波峰从而改善近场波形。
For the problem that TEM horn antenna used in the radiating wave nuclear electromagnetic pulse （NEMP） simulator has limited ability of low frequency radiating,two basic types of TEM horn antennas （composed of plates and wires respectively） are analyzed.Based on TEM horn antenna composed of wires that can make simulator lighter,a new type of TEM horn antenna is designed by using the structure of helixes end and attaching the shielded plates circuit to antenna.Results show that compared with the common type of the TEM horn antenna composed of wires,this new type of antenna has improved the ability of low frequency radiating greatly.The pulse width of near field waveform is longer by almost seven nanoseconds,and the peak value of pulse is larger by almost one kilovolt per meter.Increasing the radius of helixes and decreasing the pitch of helixes can further enhance both pulse width and peak value of the field strength.Meanwhile,attaching the shielded plates circuit to antenna can further lower down the wave crest generated by reflected signals,which makes the near field waveforms much better.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第1期242-247,共6页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(51177174)
总装备部试验技术合作项目
关键词
核电磁脉冲
辐射波核电磁脉冲模拟器
TEM喇叭天线
螺旋线
双指数脉冲
nuclear electromagnetic pulse
radiating-wave nuclear electromagnetic pulse simulator
TEM horn antenna
helixes
double exponential pulse
