It is not the absolute size that matters, it is the optical size (in microwave people call electric size) that matters. For dielectric materials with refractive index n, the optical size is geometrical length divided by min(lambda0/n) where lambda0 is the wavelength. For heavy lossy materials such as some metals, it is the skip depth.
FDTD is a discrete method. therefore the simulation volume has to be discretized into small "bricks", called Yee cells. The default meshing size is min(lambda0/n)/N where N is called mesh density. By default our FDTD uses N=10, which is a coarse mesh. For more accurate result, N can be larger.
In addition, the simulaiton needs to store the geometry buildings, the material property, source, monitor and boundary conditions. therefore FDTD has an option to let you check the memory requirement before running. If
the running memory requires more, then you will need to upgrade your computer to cloud or HPC.
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