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A capacitor divider with bandwidth over 10 GHz
1Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China.
The Review of Scientific Instruments
|October 10, 2025
Summary
This study investigates capacitor dividers for high-voltage pulse measurement. Decreasing sensor size improves frequency response, and a novel method accurately measures fast pulses up to 12 GHz.
Area of Science:
- Electrical Engineering
- High-Voltage Engineering
- Pulse Measurement Technology
Background:
- Capacitor dividers are crucial for high-voltage pulse diagnostics.
- Optimizing their amplitude-frequency response is essential for accurate measurements.
Purpose of the Study:
- To investigate the characteristics of disk and coaxial capacitor dividers.
- To enhance the upper-limited response frequency of these sensors.
- To develop methods for accurate high-voltage pulse measurement.
Main Methods:
- Experimental analysis of disk capacitor dividers with varying diameters.
- Experimental and circuit simulation of coaxial capacitor dividers with varying lengths.
- Development of a numerical post-processing method for low-frequency compensation.
Main Results:
- Decreasing the diameter of disk capacitor dividers improves upper-limited response frequency.
- Decreasing the length of coaxial capacitor dividers enhances upper-limited response frequency.
- A coaxial sensor achieved an upper-limited response frequency of approximately 12 GHz for 100 ps rise-time pulses.
Conclusions:
- Sensor geometry significantly impacts high-voltage pulse measurement bandwidth.
- A numerical post-processing technique enables accurate measurement of fast high-voltage pulses with capacitor dividers.
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