Can anyone please suggest why do we need to put the extra padding around the simulation region? Is it only for calculating field values at those points outside the bounding box of my objects?
I am simulating an antenna. If I only need the reflection coefficient, then is it necessary to have an extended padding? Can I put a very small padding, e.g. 1mm, which is much smaller than the default lambda/8 padding size for broadband setup? Will it be an issue if the grid contains the antenna only, i.e. such a small padding around the antenna?