JOLT: a highly directive, very intensive, impulse-like radiator

Baum, Carl E.; Baker, William L.; Prather, W.D.; Lehr, J.M.; O'Loughlin, J.P.; Giri, D. V.; Smith, I.; Altes, R.; Fockler, J.; McLemore, D.M.; Abdalla, Michael D.; Skipper, Michael C.

doi:10.1109/jproc.2004.829011

Cited by 116 publications

(36 citation statements)

References 9 publications

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“…Whereas the narrowband waveform threats (few to tens of gigahertz) use vacuum technology sources, the wideband and ultra wideband (UWB) waveform threats (hundreds of megahertz to a few gigahertz) are based on power switching fast technologies [1][2][3][4][5]. Faced with those wideband threats, the short duration oscillating power systems (a few oscillations) [6][7] present a great significance for the susceptibility investigation of electronic systems using unprotected wiring (Ethernet cables and/or power cords).…”

Section: Introductionmentioning

confidence: 99%

An oil peaking switch to drive a dipole antenna for wideband applications

Pecquois

Pécastaing

Rivaletto

et al. 2011

2011 IEEE International Conference on Dielectric Liquids

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When the load is an antenna, the High Pulsed Power (HPP) generators allow generating electromagnetic waves in the form of pulses for wideband or ultra wideband applications. In this case, the HPP generator is usually made up of a primary energy source loading a power-amplification system. A Marx generator or a Tesla transformer is classically used as a poweramplifier. Our structure uses an innovating very compact resonant transformer. This power amplification device is connected to a fast switch which forwards the energy from this source to the antenna. The antenna behavior is directly linked to the performances of the main element of this whole device: an oil peaking switch.The whole device is composed of a battery set, a DC/DC 300V-10kV converter which feeds four primary capacitors with a 1.2A current, four triggered spark gap switches, a resonant transformer with four primaries generating a few hundreds kV pulses, the oil peaking switch and the dipole antenna. The device must transmit waveforms with a wide frequency band. This paper presents first the preliminary studies on an oil switch used in a transmission line setup. Several oils are studied, tested and compared. First experimental tests aimed at determining the electrical breakdown field in oils and the rise-time for conditions close to our application. The switch characteristics (breakdown voltage, breakdown electric field, rise time, etc) are thus studied for various electrodes gap distances. These results and the influence of these previous parameters on the antenna performances (antenna factor, figure-of-merit, radiated field) are predicted by CST Microwave Studio and compared to measurements.

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Section: Introductionmentioning

confidence: 99%

An oil peaking switch to drive a dipole antenna for wideband applications

Pecquois

Pécastaing

Rivaletto

et al. 2011

2011 IEEE International Conference on Dielectric Liquids

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“…They can be employed as high power, broadband jammers for disrupting the critical military and civilian electronic systems [7]. Hyperband radiator used is a Half Impulse Radiating Antenna (HIRA), which is non-dispersive with a planar phase front [8].…”

Section: Hiramentioning

confidence: 99%

Experimental Studies and Analysis on Iemi Source, Field Propagation and Iemi Coupling to Power Utility System

Shyamala¹,

Kichouliya²,

Kumar³

et al. 2018

PIER C

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Abstract-Intentional Electromagnetic Interference (IEMI) is one of the applications of HighPower Electromagnetics (HPEM) for causing intentional interference in military targets such as C 4 I (Command, Control, Communication, Computer and Intelligence) targets and segments of civilian systems like critical VSAT's (Very Small Aperture Terminals), power grid and communication network, weather and air-traffic control radars etc. HPEM essentially consists of generation of intense electromagnetic waves either as High Power Microwave (HPM) or Ultra Wide Band (UWB) waves to cause electromagnetic interference. High power UWB electromagnetic waves are promising candidate for IEMI application. One such UWB source, developed for the purpose of radiating high intensity, fast rise time, short pulses, is the Half Impulse Radiating Antenna (HIRA) system, which covers a frequency range from 100 MHz to 6 GHz. In this paper, radiation characteristics of UWB source like electric field in both boresight and off-boresight, far field boundary and radiation pattern were studied. The UWB pulse dispersion through civil infrastructure and their coupling to power cables were studied computationally and validated experimentally.

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“…In Baum [2007] the focal fields are calculated for a two-TEM feedarm prolate spheroidal IRA. However, the analytical results can be simply extended to the four-arm case [Baum et al, 2004;Baretela and Tyo, 2003]. Figure 2 shows the TEM feed-arms geometry.…”

Section: Description Of Geometrymentioning

confidence: 99%

Focal waveforms for various source waveforms driving a prolate‐spheroidal impulse radiating antenna (IRA)

et al. 2008

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[1] Impulse radiating antennas (IRAs) are designed to radiate very fast pulses in a narrow beam with low dispersion and high field amplitude. For this reason they have been used in a variety of applications. IRAs have been developed for use in the transient far-field region using parabolic reflectors. However, in this paper we focus in the near field region and develop the field waveform at the second focus of a prolate-spheroidal IRA. Certain skin cancers can be killed by the application of a high-amplitude electric field pulse. This can be accomplished by either inserting electrodes near the skin cancer or by applying fast, high-electric field pulses without direct contact. We investigate a new manifestation of an IRA, in which we use a prolate spheroid as a reflector instead of a parabolic reflector and focus in the near-field region instead of the far-field region. This technique minimizes skin damage associated with inserting electrodes near the tumor. Analytical and experimental behaviors for the focal waveforms of two and four-feed arm prolate-spheroidal IRAs are explored. With appropriate choice of the driving waveform we maximize the impulse field at the second focus. The focal waveform of a prolatespheroidal IRA has been explained theoretically and verified experimentally.Citation: Altunc, S., C. E. Baum, C. G. Christodoulou, E. Schamiloglu, and C. J. Buchenauer (2008), Focal waveforms for various source waveforms driving a prolate-spheroidal impulse radiating antenna (IRA), Radio Sci., 43, RS4S13,

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JOLT: a highly directive, very intensive, impulse-like radiator

Cited by 116 publications

References 9 publications

An oil peaking switch to drive a dipole antenna for wideband applications

An oil peaking switch to drive a dipole antenna for wideband applications

Experimental Studies and Analysis on Iemi Source, Field Propagation and Iemi Coupling to Power Utility System

Focal waveforms for various source waveforms driving a prolate‐spheroidal impulse radiating antenna (IRA)

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