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A finite-difference time-domain near zone to far zone transformation [electromagnetic scattering]

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4 Author(s)
R. J. Luebbers ; Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA ; K. S. Kunz ; M. Schneider ; F. Hunsberger

An efficient time-domain near-zone-to-far-zone transformation for FDTD (finite-difference-time-domain) computations is presented. The approach is to keep a running accumulation of the far-zone time-domain vector potentials due to the tangential electric and magnetic fields on a closed surface surrounding the scatterer at each time step. At the end of the computation, these vector potentials are converted to time-domain far-zone fields. Many far-zone bistatic directions can be included efficiently during one FDTD computational run. Frequency domain results can be obtained via fast Fourier transform. Wideband results for scattering from a perfectly conducting plate were obtained from a single FDTD computation transformed to the frequency domain, and compared with moment method results. This approach is significantly more efficient than computing many FDTD results using sinusoidally varying excitation if a wide frequency band is of interest. Coupled with recent advances in computing FDTD results for frequency-dependent materials, wideband results for far-zone scattering from targets including frequency-dependent materials can be obtained efficiently

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:39 ,  Issue: 4 )