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An interesting phenomenon in the finite difference time domain simulation of a Gaussian pulse propagation in a waveguide
Author(s) -
Dou W. B.,
Yung Edward K. N.
Publication year - 2001
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2000rs002354
Subject(s) - finite difference time domain method , poynting vector , cutoff frequency , waveguide , cutoff , pulse (music) , physics , gaussian , time domain , optics , computational physics , electromagnetic pulse , mathematics , mathematical analysis , computer science , quantum mechanics , detector , magnetic field , computer vision
In this paper, an interesting phenomenon is revealed in the finite difference time domain (FDTD) simulation of a Gaussian pulse propagation in a rectangular waveguide. It is found that when a Gaussian pulse is used in a rectangular waveguide, an electric field peak will occur at the cutoff frequency of the dominant mode of the waveguide even when the FDTD simulation is implemented in the absence of nonlinear material. It appears that the spectrum power at the zero frequency of the Gaussian pulse is transformed into the spectrum power at the cutoff frequency of the dominant mode. The cause is investigated, and an explanation based on the Poynting theorem is presented.