A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetit...A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetitive charging module,a Tesla transformer and a sharpening switch.With its voltage lower than 1 kV,the primary repetitive charging circuit comprises two fast thyristors as its low-voltage switches.The spiral Tesla transformer acts as the main step-up component,and its peak transformation ratio is designed to be more than 100.A self-breakdown spark switch,i.e.the sharpening switch,is used to sharpen the output of the transformer and to generate nanosecond pulses.The HRNPG prototype is capable of generating pulses of 100 kV in peak with rise time 30 ns and the maximum repetition rate of 500 Hz on a 6 k load.Experimental results show,without any magnetic core,the developed Tesla transformer prototype can easily output high voltage while keeping itself small in size and light in weight,which is of significance for the compactness and portability of the pulse generator.The N2-insulated spark switch operated well at voltage close to 100 kV and the repetition rate within several hundreds of hertz.展开更多
Synthesis of ultra-wideband （UWB） linear frequency modulation radar signals is a very important technology for microwave imaging, target identification and detection of low radar-cross-section （RCS） targets. A new...Synthesis of ultra-wideband （UWB） linear frequency modulation radar signals is a very important technology for microwave imaging, target identification and detection of low radar-cross-section （RCS） targets. A new method of UWB radar signals generation with two-channel signal generator is presented. The realization structure is given; the principle and errors of signal synthesis are analyzed. At the same time, an automatic .adjustment measure of signal phase is proposed because of phase discontinuity of waveform in this method. The simulation experiment and analysis results indicate that radar signals with large instantaneous bandwidth can be generated by means of this method on the condition that the high-speed digital devices are limited.展开更多
A monopole and a dual-polar ten-stage miniature Marx generators with avalanche transistors are designed and developed for experiments of electromagnetic pulses.These avalanche transistors,which exceed traditional gas-...A monopole and a dual-polar ten-stage miniature Marx generators with avalanche transistors are designed and developed for experiments of electromagnetic pulses.These avalanche transistors,which exceed traditional gas-gap switches in stability,size and repetition rate,are used as the high-speed switches in the Marx circuit.The influences of charging resistors,capacitances and load impedances on pulse width,repetition rate of output pulses are analyzed.The monopole Marx circuit has a size of 74 mm×32 mm,and its output voltage is1.8 kV when the charging voltage is 280 V.The dual-polar Marx circuit,which is 98 mm×32 mm,can generate either positive or negative polarity pulses synchronously with an output voltage of±1.6 kV,and a repetition rate of 10 kHz.The feasibility of the presented dual-polar Marx generator is proved by further tests.展开更多
基金Project supported by National Natural Science Foundation of China （51107049）.
文摘A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetitive charging module,a Tesla transformer and a sharpening switch.With its voltage lower than 1 kV,the primary repetitive charging circuit comprises two fast thyristors as its low-voltage switches.The spiral Tesla transformer acts as the main step-up component,and its peak transformation ratio is designed to be more than 100.A self-breakdown spark switch,i.e.the sharpening switch,is used to sharpen the output of the transformer and to generate nanosecond pulses.The HRNPG prototype is capable of generating pulses of 100 kV in peak with rise time 30 ns and the maximum repetition rate of 500 Hz on a 6 k load.Experimental results show,without any magnetic core,the developed Tesla transformer prototype can easily output high voltage while keeping itself small in size and light in weight,which is of significance for the compactness and portability of the pulse generator.The N2-insulated spark switch operated well at voltage close to 100 kV and the repetition rate within several hundreds of hertz.
文摘Synthesis of ultra-wideband （UWB） linear frequency modulation radar signals is a very important technology for microwave imaging, target identification and detection of low radar-cross-section （RCS） targets. A new method of UWB radar signals generation with two-channel signal generator is presented. The realization structure is given; the principle and errors of signal synthesis are analyzed. At the same time, an automatic .adjustment measure of signal phase is proposed because of phase discontinuity of waveform in this method. The simulation experiment and analysis results indicate that radar signals with large instantaneous bandwidth can be generated by means of this method on the condition that the high-speed digital devices are limited.
基金Project supported by National Natural Science Foundation of China （50977091 ）.
文摘A monopole and a dual-polar ten-stage miniature Marx generators with avalanche transistors are designed and developed for experiments of electromagnetic pulses.These avalanche transistors,which exceed traditional gas-gap switches in stability,size and repetition rate,are used as the high-speed switches in the Marx circuit.The influences of charging resistors,capacitances and load impedances on pulse width,repetition rate of output pulses are analyzed.The monopole Marx circuit has a size of 74 mm×32 mm,and its output voltage is1.8 kV when the charging voltage is 280 V.The dual-polar Marx circuit,which is 98 mm×32 mm,can generate either positive or negative polarity pulses synchronously with an output voltage of±1.6 kV,and a repetition rate of 10 kHz.The feasibility of the presented dual-polar Marx generator is proved by further tests.
