I plan putting the cap ax on the ceiling in the groundfloor - will its antenna beam downward only-ish, or symmetrically - upwards and downwards?
ie will that position work for the 1st floor as well, or will it be better to put it on the ceiling of the 1st floor if it’s beam orientation is primarily downward
It makes no sense for a device designed to be mounted on a wall/ceiling to also be able to reach behind the wall/ceiling.
Then it's obvious that some of it also reaches upstairs, but obviously that's exactly what the device want to avoid...
in my usecase it would make sense.
do you have information if my usecase is considered, or is that your personal point of view?
There will be some radiation towards the back of the unit but not much.
It's designed to send as much as possible to one end.
Add to that the ceiling itself and you can figure out yourself what will be available on the second floor.
Not much or not reliable at all.
You can search for FCC certification documents. It should have all the radiation patterns in it.
Similar with placing it on the second floor.
You may run into troubles on the first floor because of losses when passing that floor.
Ideally you have 1 AP per floor (but you could position them so they are not really on top of each other).
Specifically the cAPs have some sort of reflectors presumably to avoid sending signal up through the ceiling, see: