By K. Agi, M. Mojahedi, K. J. Malloy (auth.), Carl E. Baum, Lawrence Carin, Alexander P. Stone (eds.)
The first foreign meetings on Ultra-Wideband (UWB), Short-Pulse (SP) Electromagnetics have been held at Polytechnic college, Brooklyn, long island in 1992 and 1994. Their function used to be to target complex applied sciences for producing, radiating, and detecting UWB,SP signs, on mathematical tools, their propagation and scattering, and on present in addition to strength destiny purposes. The good fortune of those meetings ended in the desirability of scheduling a 3rd convention. Impetus used to be supplied through the electromagnetics group and discussions led by means of Carl Baum and Larry Carin ended in the advice that the UWB meetings be moved round, say to executive laboratories similar to Phillips Laboratory. for this reason the choice used to be made by means of the everlasting HPEM Committee to extend AMEREM '96 to incorporate the 3rd Ultra-Wide Band, Short-Pulse (UWB,SP three) with the 3rd Unexploded Ordnance Detec tion and variety Remediation convention (UXO) and the HPEMINEM convention in Albuquerque, New Mexico in the course of the interval might 27-31, 1996. making plans is now underway for EUROEM '98 in June, 1998 in Tel Aviv, Israel. Joseph Shiloh is the convention chairman. A fourth UWB,SP assembly is deliberate as part of this convention and Ehud Heyman will coordinate this a part of the assembly. The papers which seem during this quantity, the 3rd within the UWB,SP sequence, replace topic parts from the sooner UWB,SP meetings. those themes contain pulse iteration and detection, antennas, pulse propagation, scattering thought, sign processing, broadband digital structures, and buried targets.
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G. Baca, H. J. Hjalmarson, T. A. Plut, and C. H. Sifford for their help. This work was supported by the United States Department of Energy under contract DE-AC04-94AL85000. REFERENCES 1. G. M. Loubriel, M. W. O'Malley, and F. J. Zutavern, "Toward Pulsed Power Uses for Photoconductive Semiconductor Switches: Closing Switches," Proc. 6th IEEE Pulsed Power Conference, P. J. Turchi and B. H. , Arlington, VA, 1987, p. 145. 2. G. M. Loubriel, F. J. Zutavern, M. W. O'Malley, and W. D. Helgeson, "High Gain GaAs Photoconductive Semiconductor Switches for Impulse Sources," Proc.
If the switch rise time is slower than the one way transit time of the Blumlein. the fall time in the charging voltage should correspond to about twice the risetime of the switch (assuming the rise and fall times are equal). This was confirmed by replacing the GaAs switch with a highly resistive Si switch incapable of fast avalanche. Figure 4(b) shows a charging voltage for this case where switch closure is seen. The fall time was about 40 ns which corresponded approximately to twice the risetime of our laser pulse.
Antenna transfer function (left) and the cross section of a flat metal plate with dimensions of 10m by 10m. An existing antenna which may be used for this work is a large TEM hom with flared aperture plates and a high-voltage inline coaxial 'zipper' balun (the 'adapter' in reference 5) as the input section. It has a transfer function whose magnitude is shown in figure 6. This was developed by measuring two time domain waveforms. One was a bipolar (monocycle) voltage pulse created by a custom pulse generator with a +/- 100 V amplitude, and primary spectral content from 50 to 400 MHz.