Wang Yuwei, Chen Dongqun, Zhang Jiande, Cao Shengguang, Li Da, Liu Chebo
College of Photoelectrical Science and Engineering, National University of Defense Technology, Hunan 410073, People's Republic of China.
Rev Sci Instrum. 2013 Sep;84(9):094705. doi: 10.1063/1.4820822.
To generate a relative high frequency mesoband microwave, a compact coaxially fed transmission line switched oscillator with high voltage capability is investigated. The characteristic impedance and voltage capability of the low impedance transmission line (LITL) have been analyzed. It is shown that the working voltage of the oscillator can reach up to 200 kV when it is filled by pressurized nitrogen and charged by a nanosecond driving source. By utilizing a commercial electromagnetic simulation code, the transient performance of the switched oscillator with a lumped resistance load is simulated. It is illustrated that the center frequency of the output signal reaches up to ~0.6 GHz when the spark gap practically closes with a single channel. Besides, the influence of the closing mode and rapidity of the spark gap, the permittivity of the insulator at the output end of the LITL, and the load impedance on the transient performance of the designed oscillator has been analyzed in quantification. Finally, the good transient performance of the switched oscillator has been preliminarily proved by the experiment.
为了产生相对高频的中带微波，研究了一种具有高电压能力的紧凑型同轴馈电传输线开关振荡器。分析了低阻抗传输线（LITL）的特性阻抗和电压能力。结果表明，当用加压氮气填充并用纳秒驱动源充电时，振荡器的工作电压可达200 kV。利用商业电磁仿真代码，模拟了具有集总电阻负载的开关振荡器的瞬态性能。结果表明，当火花隙实际以单通道闭合时，输出信号的中心频率可达~0.6 GHz。此外，还定量分析了火花隙的闭合模式和速度、LITL输出端绝缘子的介电常数以及负载阻抗对所设计振荡器瞬态性能的影响。最后，通过实验初步证明了开关振荡器具有良好的瞬态性能。
