Abstract
When an ultra-wideband electromagnetic pulse penetrates into a causally dispersive dielectric, the interrelated effects of phase dispersion and attenuation alter the pulse in a fundamental way that results in the appearance of precursor fields. For a Debye-type dielectric, the dynamical field evolution is dominated by the Brillouin precursor as the propagation distance exceeds a penetration depth. Because of its nonexponential peak decay, the Brillouin precursor is of central importance in ultra-wideband electromagnetics. Of equal importance is the frequency structure of the Brillouin precursor which exhibits a complicated dependence on both the material dispersion and the input pulse characteristics. A Brillouin pulse is defined and shown to possess optimal material penetration.
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Oughstun, K.E. (2007). Dynamical Behavior of the Brillouin Precursor in Rocard-Powles-Debye Model Dielectrics. In: Sabath, F., Mokole, E.L., Schenk, U., Nitsch, D. (eds) Ultra-Wideband, Short-Pulse Electromagnetics 7. Springer, New York, NY. https://doi.org/10.1007/978-0-387-37731-5_8
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DOI: https://doi.org/10.1007/978-0-387-37731-5_8
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