How would you calculate the capacitance of a capacitor when one plate is a plain flat metallic conductor but the other has increased surface area e.g. because it was enhanced it with activated carbon?
I think if you added the higher surface area layer to both sides of ceramic then both plates would have the same surface area and you could approximate the capacitance as if they were parallel plates right? And if you got ride of the carbon all together it would just be the parallel plate problem, but with a low capacitance because you lost most of the surface area.
So intuitively I would think the capacitance would be somewhere in between. But would it be closer to the high cap from putting the additive on both sides, or closer to the lower cap from removing it altogether, and how to calculate?
Edit: I think the carbon layer is just confusing the issue. So what if instead of increasing the surface area you just put a bunch of nano pillars on the one plate. Like this: