Transparent grid termination (TGT) for finite difference time domain (FD-TD) electromagnetic field computation in one, two, and three dimensions
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In order to solve FD-TD electromagnetic radiation and scattering problems in free space, the computational grid should be truncated at some finite distance to simulate the solution for an infinitely large grid. One way to emulate an infinite grid is to absorb outgoing waves incident onto the grid boundary such that there is no reflection back into the grid. Waves incident to the boundary must 'exit' the grid boundary without affecting the solution within the grid. Based on this idea, this thesis develops Transparent Grid Termination (TGT) in 1-D, 2-D and 3-D as an aDsorbing boundary. TGT performance is compared with a very large grid for which reflections do not return to the computational domain within the observation time window.