基于脉冲形成线充电的脉冲压缩技术

利用脉冲压缩技术,将具有一定初始电压的高阻抗长脉冲形成线对低阻抗短脉冲形成线充电到一定值时,其输出开关导通,在其后的传输线上可以产生高功率短脉冲。给出了脉冲压缩理论分析;前级脉冲驱动源采用GW级纳秒脉冲形成线,其特性阻抗为40Ω、电长度为3.9ns,输出脉冲宽度约8ns;研制了与前级脉冲驱动源匹配的脉冲压缩装置和变阻抗传输线,考虑到脉冲压缩装置低阻抗形成线绝缘击穿和开关导通限制,选取脉压装置形成线特性阻抗6.5Ω、电长度0.5ns。利用GW级纳秒脉冲驱动源开展了脉冲压缩实验,得到了输出功率增益达4倍左右的脉宽1.5ns高功率短脉冲,输出脉冲功率增益与理论值基本相符。

Pulse compression based on pulse forming line charging techonlogy

A high power short pulse can be generated by using pulse compression technology. The high impedance pulse forming line is initially charged, when its switch is closed, the energy flows to the lower impedance pulse forming line, as the voltage builds on the lower impedance pulse forming line, the output switch closes and the high power short pulse is generated and delivered to the output transmission line section. The principle analysis of pulse compression is presented. A GW level ns pulse driver is used as the high impedance pulse forming line with a characteristic impedance of 40 , an electrical length of 3.9 ns and an output pulse width of about 8 ns. The pulse compression device and impedance tapered line are developed, considering breakdown restrictions of lower impedance pulse forming line insulation and the output switch, the characteristic impedance and electrical length of pulse compression device are chosen as 6.5 and 0.5 ns respectively. By using the GW level nanosecond pulse driver, a pulse compression experiment is carried out. The experimental results show the pulse compression device output high power short pulse width is of 1.5 ns, and the power increase ratio is about 4, the experimental results are in good agreement with that from theoretical design.