Design of a damped sinusoidal oscillator system

Lee, J. M.; Kwon, Hae-Ok; Hwang, S. M.; Ahn, Jinsook

doi:10.1109/ppc.2011.6191456

Cited by 5 publications

(6 citation statements)

References 1 publication

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“…Indeed, when the oscillator is switched, the circuit is equivalent to a damped oscillator (high impedance of the transformer at its input and low impedance of the switch at its output) from which its energy is radiated by the helical antenna. Due to the presence of two quite different sections, the design and the realization of this line oscillator is very accurate [15]. Design must be simplified if we can propose only a coaxial line oscillator with polyamide 6 dielectric (PA6).…”

Section: Coaxial Damped Oscillator Designmentioning

confidence: 99%

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Feed Signal Influence and Potential Performances of a Compact Radiation Source Based on a Helical Antenna

Pécastaing¹,

Rivaletto²,

Ferron³

et al. 2015

JEMAA

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In the class of emerging high power electromagnetic sources, a complete pulsed power source, named MOUNA (French acronym of "Module Oscillant Utilisant une Nouvelle Architecture") has been developed. This device must transmit waveforms with a wide frequency band and a high figure-of-merit. To improve the overall performance of the MOUNA system while maintaining its compact size, two approaches are being explored in the paper: the replacement of the dipole antenna by a helical antenna and its feeding signal influence. Helical antenna is cylindrical shape and relatively compact. It offers relatively good gain factor and directivity. The waveform delivered to the antenna is directly related to the amplitude of the radiated electric field. Therefore, different waveforms (step pulse, Gaussian pulse, bipolar pulse and damped sinusoid) are compared to point out the feed signal influence on the radiated electric field. Switch oscillators appear to be considered as interesting resonant sources for driving an antenna. The novel radiating source consists of a primary power source, a resonant transformer, a coaxial transmission line damped oscillator (also termed as coaxial resonator), and a helical antenna. This high voltage pulsed source is very compact (volume of only 2500 cc without the antenna). Our study aims at designing the antenna (number of turns, size…) and a coaxial damped oscillator directly implemented at the output of the transformer. A CST-based simulation is proposed to predict the performances of this wideband source.

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Section: Coaxial Damped Oscillator Designmentioning

confidence: 99%

“…Some sources already exist and use a Marx generator associated to a helical antenna [13]- [15]. Only one associates a 30 kV pulse transformer, a damped oscillator and a helical antenna [13].…”

Section: Introductionmentioning

confidence: 99%

Feed Signal Influence and Potential Performances of a Compact Radiation Source Based on a Helical Antenna

Pécastaing¹,

Rivaletto²,

Ferron³

et al. 2015

JEMAA

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“…Many papers [12,[15][16][17] describe the principle and realization of a low impedance line damped oscillator to feed a high impedance antenna. In most cases, the quarter wave line is composed of a radial section followed by a coaxial section.…”

Section: Coaxial Damped Oscillator Designmentioning

confidence: 99%

“…The arrangement of the new helical antenna radiating system is presented on Figure 2. Some sources already exist and use a Marx generator associated to a helical antenna [13][14][15]. Only one associates a 30kV pulse transformer, a damped oscillator and a helical antenna [13].…”

Section: Introductionmentioning

confidence: 99%

“…Our novel radiating source combined a 600kV pulse transformer, a coaxial switched oscillator and a helical antenna in a weak volume for the pulse generator of about 25 liters. Principle and/or realization of switched oscillators are described in many papers [12,[15][16][17] where the line has a radial section and a coaxial section due to the use of only one switch. Our oscillator is only composed of a coaxial section switched by the multichannel annular gas switch.…”

Section: Introductionmentioning

confidence: 99%

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A 600kV resonant pulse transformer combined to a helical antenna

Pécastaing¹,

Rivaletto²,

Ferron³

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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A complete pulsed power source, named MOUNA, is composed of a set of batteries, a DC/DC converter to charge four capacitors, four synchronized spark gap switches, a resonant transformer generating 600kV/265ns pulses, an oil peaking switch and a dipole antenna. This device must transmit waveforms with a wide frequency band and a high figure-of-merit.However, to radiate very high electric fields, the low gain of the dipole antenna is detrimental. The use of a directional antenna may improve performance really significantly focusing the radiation in a preferred direction. The main characteristics of the axial helical antenna (compactness, high gain on the axis, wideband spectrum and high impedance) make it an excellent candidate.In this paper, the first results concerning the design of the antenna (number of turns, size…), of a switch oscillator directly implemented at the output of the transformer are presented. The design of the novel radiating source composed of the MOUNA pulsed power source, the switch oscillator and the helical antenna is also described. The pulsed source and the oscillator contains in a volume of only 25 litres. Finally a CSTbased simulation is proposed to predict the performances of this wideband source.

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Investigation of a compact coaxially fed switched oscillator

Wang

Chen

Zhang

et al. 2013

Review of Scientific Instruments

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To generate a relative high frequency mesoband microwave, a compact coaxially fed transmission line switched oscillator with high voltage capability is investigated. The characteristic impedance and voltage capability of the low impedance transmission line (LITL) have been analyzed. It is shown that the working voltage of the oscillator can reach up to 200 kV when it is filled by pressurized nitrogen and charged by a nanosecond driving source. By utilizing a commercial electromagnetic simulation code, the transient performance of the switched oscillator with a lumped resistance load is simulated. It is illustrated that the center frequency of the output signal reaches up to ~0.6 GHz when the spark gap practically closes with a single channel. Besides, the influence of the closing mode and rapidity of the spark gap, the permittivity of the insulator at the output end of the LITL, and the load impedance on the transient performance of the designed oscillator has been analyzed in quantification. Finally, the good transient performance of the switched oscillator has been preliminarily proved by the experiment.

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Design of a damped sinusoidal oscillator system

Cited by 5 publications

References 1 publication

Feed Signal Influence and Potential Performances of a Compact Radiation Source Based on a Helical Antenna

Feed Signal Influence and Potential Performances of a Compact Radiation Source Based on a Helical Antenna

A 600kV resonant pulse transformer combined to a helical antenna

Investigation of a compact coaxially fed switched oscillator

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