Abstract
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.
Highlights
High power microwave (HPM) sources have been developed over the past few decades for many applications, including defense for disrupting electronically-controlled system, medical for cell manipulation, and biological for food and water purification [1]
The electromagnetic pulse 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 600 kV/265 ns pulses, an oil peaking switch and a dipole antenna
To keep MOUNA dimensions, the helical antenna diameter must be around 22 cm, in free-space the wavelength of the radiating field must be around 69 cm and its frequency around 434 MHz
Summary
High power microwave (HPM) sources have been developed over the past few decades for many applications, including defense for disrupting electronically-controlled system, medical for cell manipulation, and biological for food and water purification [1]. Intentional electromagnetic interference describes a wide range of technologies that are designed to disrupt the performance of electronic systems by introduction of spurious signals in different frequency ranges These systems must typically be high power, since it is generally desired to have as large an effect possible at as long distances possible [8]. The electromagnetic pulse 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 600 kV/265 ns pulses, an oil peaking switch and a dipole antenna This source is compact, with dimensions less than 1 m in length and 22 cm in diameter. Posed of the MOUNA pulsed power source, the switch oscillator and the helical antenna is described and the predicted overall performances of the electrical characteristics are detailed
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