Accession Number : AD1005441


Title :   Ultra-Wideband Electromagnetic Pulse Propagation through Causal Media


Descriptive Note : Technical Report,15 Dec 2012,14 Dec 2015


Corporate Author : RESEARCH FOUNDATION OF STATE UNIVERSITY OF NEW YORK New Paltz United States


Personal Author(s) : Cartwright,Natalie A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1005441.pdf


Report Date : 04 Mar 2016


Pagination or Media Count : 8


Abstract : When an electromagnetic pulse travels through a dispersive material each frequency of the transmitted pulse changes in both amplitude and phase, and each frequency at its own rate. As a consequence, broadband pulses propagating in dispersive material experience significant amplitude distortion and changes in pulse velocity. Asymptotic analysis of the exact integral representation of the propagated field, which utilizes the full causal dispersion relation of the dispersive material, provides acomplete far-field description of the propagated pulse. In 1975, Oughstun and Sherman utilized asymptotic methods to show that in a dielectric (nonconducting) material the low-frequency component of the propagated field, the so-called Brillouin precursor, has a peak amplitude that decays algebraically with propagation distance (as the inverse square root of propagation distance), whereas other pulse components decay exponentially.


Descriptors :   electromagnetic pulses , PROPAGATION , amplitude , synthetic aperture radar , waveforms


Distribution Statement : APPROVED FOR PUBLIC RELEASE