Dispersion of an Electromagnetic Pulse

Aksornkitti, S.; Hsuan, H.; Lonngren, Karl E.

doi:10.1119/1.1975835

Cited by 6 publications

(3 citation statements)

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“…Maintaining its shape while crossing a dispersive medium is an exclusive characteristic of a sine wave [17]. Such waves propagate with phase velocity and experiments that measure this velocity have been described before [13]. For the sake of comparison with the group and signal velocities, we reproduce them here.…”

Section: Phase Velocitymentioning

confidence: 99%

“…This is illustrated in figure 6, which shows the square of the full width at half maximum (FWHM) for the signals seen in figure 3, as a function of the square of distance L along the cable. For a Gaussian wave packet the FWHM is approximately given by [13] (L) = 0 1 + 8 ln 2 where 0 is the FWHM at L = 0. By fitting a linear function to the data shown in figure 6, one finds 0 = (5.3 ± 0.2) ns and dvg/dω = (1.6 ± 0.1) × 10 −2 m rad −1 .…”

Section: Dispersion Relationmentioning

confidence: 99%

“…There have been proposals for experiments using coaxial transmission lines for the study of electromagnetic wave propagation. Aksornkitti et al [13] described a simple experiment that demonstrates the concept of dispersion of electromagnetic pulses. Lonngreen et al [14] suggested that pupils can be introduced to diffusion in gases using the distributed RC transmission line as a model.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic wave velocities: an experimental approach

Santos

Aguiar

2013

Eur. J. Phys.

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We describe experiments with coaxial transmission lines for the study of some of the velocities used to characterize the propagation of electromagnetic waves in a medium, namely phase, group and signal velocities. The experiments are suitable for undergraduates at advanced laboratory level. Their purpose is to acquaint the students with the fact that in a dispersive medium there are many possible definitions for the speed of light, and that the measurement of these different velocities is important for general understanding of wave propagation.

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Section: Phase Velocitymentioning

confidence: 99%

Section: Dispersion Relationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic wave velocities: an experimental approach

Santos

Aguiar

2013

Eur. J. Phys.

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Dispersion of Ion-Acoustic Waves

Joyce

1969

The Physics of Fluids

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The dispersion of ion-acoustic waves in quiescent rare-gas discharge plasmas has been investigated experimentally and theoretically. Experimentally, various grid systems were used to generate the waves which were studied using a time-of-flight technique. The experimental results show that two separate propagating phenomena appear. The slower propagating disturbance is the ion-acoustic wave, obeying the theoretically predicted dispersion behavior. The faster propagating disturbance, though superficially resembling a wave, is composed of bursts of ions produced by the driving potentials placed on the grids and would appear to be related to the “free streaming” term found by Landau. Previous theoretical models of ion-wave propagation have untilized either purely initial-value or steady-state, boundary-value calculations. A model is presented which more nearly simulates the experimental time-of-flight studies of finite packets of ion waves generated by finite sine-wave bursts.

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