A Square Patch Capacitive Voltage Divider for Measuring High-Voltage Ultrawideband Pulses in a Coaxial Pulse Forming Line

Ryu, Jiheon; Kwon, Hae-Ok; Park, Seung Hyuk; Yim, Dong Woo

doi:10.1109/tim.2015.2510551

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…Thus, (9) describes a mesoband damped sinusoidal signal because the term exp(−2 ) in the denominator makes the output voltage resonate periodically at every odd multiple of the first resonance frequency [29], [32]. In (9), to ensure that the CVD passes the output signal at the resonance frequency, the following condition should be satisfied [33]:…”

Section: B Circuit Analysis Of the Proposed Swomentioning

confidence: 99%

High-Q Switched Oscillator With Capacitive Voltage Divider for Generating Mesoband High-Power Microwave Pulses

2021

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The switched oscillator (SWO) is a quarter-wave oscillator capable of generating mesoband high-power microwave (HPM) pulses. This paper presents a novel high-quality factor (Q) SWO with a capacitive voltage divider (CVD). Unlike conventional SWOs, the transmission line energy of the proposed SWO is gradually coupled with the output load through the CVD. Thus, the proposed SWO can produce a mesoband pulse with a much higher power spectral density within the coupling bandwidth of a target in HPM effect testing. The frequency-domain output-voltage equation of the proposed SWO was obtained through a theoretical analysis of the equivalent circuit of the SWO. Through a numerical analysis, the time-domain output waveform of the proposed SWO was demonstrated to have a high quality factor, and the circuit parameters of the equivalent circuit of the SWO were set to achieve a high quality factor. The circuit parameters selected in the numerical analysis were used in an electromagnetic simulation to determine the design parameters of the parallel-plate transmission line (PPTL)-based SWO with the CVD built on a printed circuit board. The proposed SWO was fabricated and its performance was assessed. For a breakdown voltage of 8.7 kV, the output voltage of the fabricated SWO showed a quality factor of 25, which is more than two times larger than the quality factors of conventional SWOs. Thus, the proposed SWO was demonstrated to produce high-Q mesoband HPM pulses, and it has the potential to be applied in HPM effect testing. Moreover, the proposed SWO improves operator safety by preventing the output load from being charged by a highvoltage power supply. INDEX TERMS High-power microwave, switched oscillator, capacitive voltage divider, mesoband generator.

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Section: B Circuit Analysis Of the Proposed Swomentioning

confidence: 99%

High-Q Switched Oscillator With Capacitive Voltage Divider for Generating Mesoband High-Power Microwave Pulses

2021

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“…In the laboratory setting, the oscilloscope is one of the most popular and appropriate measurement tools for impulse measurement [33][34][35]. However, it is suitable for the laboratory not the mobile platform.…”

Section: Introductionmentioning

confidence: 99%

A low sampling rate method for the monopole UWB impulse parameter monitoring using waveform transformation

Zhang¹,

Xie²,

Li³

et al. 2023

Meas. Sci. Technol.

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In ultra-wideband (UWB) impulse parameter monitoring, amplitude and pulse width measurements are crucial for detecting and classifying unknown impulse signals. Meanwhile, mass sampling data and the complexity of the current measurement technologies are the limitations of real-time and continuous monitoring. It urges to adopt a simple method that reduces the sampling rate without sacrificing accuracy. This article suggests a novel approach for the monopole UWB by analog signal preprocessing before sampling. A peak detector and integrator are utilized to retain the impulse amplitude and the area inside the impulse for a period, which is the so-called waveform transformation. A low-speed two-channel synchronous ADC samples the output signals from the peak detector and the integrator to determine the amplitude and the area. In the signal process, we demonstrate the concept that pulse width value equals the division of area and amplitude. Due to the distorted amplitude caused by the response time of the peak detector, the relationship between the distorted amplitude, the actual amplitude, and the pulse width is analyzed and examined based on the response function. Finally, the actual amplitude and pulse width are acquired and calculated by solving two equations. In terms of impulse waveform, rectangular and Gaussian waveform factors are developed and applied in the measurement. The proof-of-concept experimental results of a 0.68 V/ 18.8 ns rectangular impulse at a 10 Msps sampling rate is 0.711 V/ 17.00 ns with 4.56 %/ 9.57% relative error, tested and verified.

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“…In PEF effect tests, it is important to accurately measure the PEF waveforms delivered to the targets. A PEF waveform is measured by an instrument, such as an electric field probe [4] or a capacitive voltage divider [13], and then the measured PEF is transferred to an oscilloscope through a microwave cable. In this measurement, the microwave cable is essential for several reasons.…”

Section: Introductionmentioning

confidence: 99%

Time-Domain Pulse Waveform Correction for Pulsed Electric Field Measurement in Microwave Cable with Frequency-Dependent Loss

Jeong

Kim

Ryu

2021

J Electromagn Eng Sci

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This paper presents a method that corrects pulse waveforms distorted by the frequency-dependent loss of microwave cables in measuring pulsed electric fields (PEFs). Because the distortion resulting from the microwave cable disrupts accurate PEF measurements, the distorted pulse should be corrected for precise PEF effect testing. The proposed correction method is achieved by a transfer function that is determined by ABCD parameters calculated from the scattering parameters of the cable. A 10-m microwave cable is tested to validate the proposed method, where the input pulse is a 2-ns sine pulse of a single cycle. Here, the output pulse, scattering parameters, and cable resistance are measured. These measurement results are used to represent the transfer function in MATLAB for the proposed correction method. The test results show that the corrected pulse obtained from the transfer function has an error of 4.5% in the peak-to-peak voltage and an error of 0.8% in the bipolar pulse width compared to the reference input pulse. The errors of PEF measurement decrease dramatically by using the proposed correction method. Moreover, the correction method is validated for various pulse durations, pulse shapes, and cable types.

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A Square Patch Capacitive Voltage Divider for Measuring High-Voltage Ultrawideband Pulses in a Coaxial Pulse Forming Line

Cited by 18 publications

References 5 publications

High-Q Switched Oscillator With Capacitive Voltage Divider for Generating Mesoband High-Power Microwave Pulses

High-Q Switched Oscillator With Capacitive Voltage Divider for Generating Mesoband High-Power Microwave Pulses

A low sampling rate method for the monopole UWB impulse parameter monitoring using waveform transformation

Time-Domain Pulse Waveform Correction for Pulsed Electric Field Measurement in Microwave Cable with Frequency-Dependent Loss

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