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Segmentation technique with ADI-FDTD for EM propagation modeling in electrically large structure

This paper deals with the electromagnetic (EM) wave propagation modeling in complex tunnel environments. We propose a novel segmented alternating direction implicit finite difference time domain (S-ADI-FDTD) method for modeling the electromagnetic wave propagation inside an electrically large tunnel. The proposed S-ADI-FDTD method reduces the computational redundancy by dividing the problem space into segments. It also allows use of larger cells in each segment. To validate this method, we simulate the propagation in real tunnels and compare the results with the published experimental data. The comparisons reveal that the proposed S-ADI-FDTD method can predict the fields most accurately in real, large tunnels at longer ranges.