Electrostatic field management and electrodynamic modeling of switched quarter-wave oscillators

Armanious, M.; Tyo, J. Scott; Skipper, Michael C.; Abdalla, Michael D.; Prather, W.D.; Gruen, G.

doi:10.1109/tdei.2011.5976095

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…This is most problematic in the bend region where the radial transmission line meets the coaxial storage section. We have developed an iterative, semi-automated design philosophy that allows us to control the field enhancement in this section and achieve a desired profile [4]. Figure 3 shows how this proceeds.…”

Section: Static Field Managementmentioning

confidence: 99%

“…We use a series of different models, including a simple Spice model and two more complicated Maxwell's equations solvers [4]. As shown in Fig.…”

Section: Dynamic Modelingmentioning

confidence: 99%

“…These distributed elements are then modeled as lumped elements and are input into a Spice model of the overall system. If a more detailed electromagnetic model is required, we use either a 2-D FEM code programmed using the Matlab PDE Toolbox [4,5] or a 3-D Finite Volume Time Domain code in CST Microwave Studio. Schematics of the computational domains for each of these models is shown in Figure 5.…”

Section: Dynamic Modelingmentioning

confidence: 99%

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Generation and radiation of high-power mesoband waveforms using quarter-wave switched oscillators

Armanious

Tyo

Skipper³

et al. 2011

2011 XXXth URSI General Assembly and Scientific Symposium

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In the late 1990s and early 2000s, Carl Baum proposed the idea of generating moderate bandwidth electromagnetic waveforms using quarter-wave switched oscillators. After his initial conceptual proposition, it took several years to realize these systems, and many lessons were learned along the way. This article captures the details of the modeling and design methodologies that we have developed over the years in order to obtain oscillators with specific characteristics. The design methodology consists of a delicate balance among the pulsed power, electrodynamic, and mechanical considerations, each of which often work against each other in practice.

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Section: Static Field Managementmentioning

confidence: 99%

“…We use a series of different models, including a simple Spice model and two more complicated Maxwell's equations solvers [4]. As shown in Fig.…”

Section: Dynamic Modelingmentioning

confidence: 99%

Section: Dynamic Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Generation and radiation of high-power mesoband waveforms using quarter-wave switched oscillators

Armanious

Tyo

Skipper³

et al. 2011

2011 XXXth URSI General Assembly and Scientific Symposium

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show abstract

“…The SWO is a quarter-wave oscillator based on a transmission line with a low characteristic impedance [21]. It has an ultrafast self-breakdown switch and a high-impedance load connected to each end of the transmission line [27]. After it is charged up to the breakdown voltage, the self-breakdown switch closes, and then a damped sinusoidal wave is transmitted to the load.…”

Section: Introductionmentioning

confidence: 99%

“…However, as decreases, the distance between two electrodes of the transmission line becomes smaller. This degrades the insulation capacity of the SWO and lowers the breakdown voltage [26], [27]. Moreover, decreased makes | | even smaller because there is substantial source impedance at the closed switch.…”

Section: Introductionmentioning

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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A New Set of Electrodes for Coaxial, Quarter Wave, and Switched Oscillators

Vega

Rachidi

Giri

et al. 2013

Ultra-Wideband, Short-Pulse Electromagnetics 10

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Electrostatic field management and electrodynamic modeling of switched quarter-wave oscillators

Cited by 17 publications

References 13 publications

Generation and radiation of high-power mesoband waveforms using quarter-wave switched oscillators

Generation and radiation of high-power mesoband waveforms using quarter-wave switched oscillators

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

A New Set of Electrodes for Coaxial, Quarter Wave, and Switched Oscillators

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