High broadband and high resistance state voltage divider based on coaxial transmission lines

With the development of pulse power technology, pulse power output gradually to high voltage, short pulse width direction, but in practice there is no suitable measurement means to measure such a short pulse high-voltage signals, there are problems mainly in the measurement of the bandwidth and the limitations of the voltage division ratio. In this regard, based on the coaxial voltage divider principle, the paper proposes a high-resistance coaxial voltage divider structure, analyzes and compares the principle of the voltage divider circuit in the 50-ohm matching and high-resistance mode of operation, and through the optimization of the internal structure of the coaxial and the modification of the transmission line so as to achieve the measurement of the pulse type of the rising front of the voltage level of 10 kV and ps level; the finite element model of the coaxial voltage divider is established by using the Ansys software and the parameters of the divider are calculated accurately. A finite element model of the coaxial voltage divider is developed using Ansys software, and the parameters of the divider are calculated accurately. The voltage divider overcomes the problems of low dividing ratio and 50 ohm load matching of general coaxial structure voltage divider, etc. According to the electromagnetic simulation analysis and experimental verification, it is confirmed that the divider can measure the pulse signal with 800 ps of rising front, pulse width of 5 ns, voltage level of 10 kV, and the calibrated bandwidth of 1 GHz and dividing ratio of 1100.