Abstract

In this work we model wave propagation in two-dimensional dispersive medium using FDTD (Finite Difference Time Domain) method. For a lossy, dispersive medium, it is significant to model the wave velocity and attenuation over a wide RF bandwidth with a simple and efficient model. Using a four-zeros single-pole rational function of the Z-transform variable (Z = exp(j??t)) to model conductivity with constant real dielectric constant, we generate a discretized time domain equation which matches measured values over more than two decades of frequency. The simulations show that there is a good agreement between measureed and modeled propagation constant and attenuation values. The modeled propagation and attenuation parameters are compared to measured data. Stability conditions are derived using von Neumann analysis and the zeros of the stability equation, which determine the minimum grid spacing interval, are plotted within the unit circle. Finally, the propagation of a 2-D modulated Guassian wave in the medium is modeled by FDTD formulation.

Notes

Poster presented at the 2006 Thrust R1B Effective Forward Models Conference

Keywords

2D FDTD Model, FDTD

Subject Categories

Finite differences, Imaging systems, Conductivity

Disciplines

Engineering

Publisher

Bernard M. Gordon Center for Subsurface Sensing and Imaging Systems (Gordon-CenSSIS)

Publication Date

2006

Rights Holder

Bernard M. Gordon Center for Subsurface Sensing and Imaging Systems (Gordon-CenSSIS)


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