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The dimensions and resolutions of a discretized domain for calculating electromagnetic fields can be restrained by the memory and computational capacity of the computer. As a result, the computational domain must utilize efficient and accurate boundary conditions in order to truncate outward waves and therefore simulate infinite radiation boundary conditions of the computational domain. One of the most useable and efficient absorbing boundary conditions that have been reported for the Finite Difference Time Domain (FDTD) is the Perfect Matched Layer (PML).
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