As a rule-of-thumb, the FDTD cell size cannot be bigger than 0.1 of the wavelength at the limit frequency, in other words, the cell size should be set to assure at least 10 cells per wavelength. It should be remembered that the FDTD method applied with particular meshing is accurate up to particular frequency limit. In case of using PML ABC its thickness should be taken into account when placing the NTF surface. The distance between the NTF surface and absorbing boundary must be at least 3 cells. In case of dipoles radiating in free space, bigger distance can be required. NTF surface should be usually placed as close the object as possible provided that there is at least 3 cells distance. The reference plane of transmission line ports should be placed at the distance of at least of 4 – 5 cells from the port towards the circuit to assure accurate S‑parameters extraction. Those remarks are grouped below by subject: This subsection gathers some rules of thumb and useful hints for FDTD simulation in QuickWave. 10.1Rules of thumb and hints for FDTD simulation in QuickWaveġ0.1 Rules of thumb and hints for FDTD simulation in QuickWave
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