Well, sorta… basically it’s reshaping the magnetic field a bit and making it go where we want it. The larger size of the NTAG216 antenna is causing the field to reshape around it, forcing flux lines through the center at a much greater density (if you can think of it that way) than without the larger antenna being there.
If you had an NFC nail (flat plane spiral antenna) inside your hand, and you placed a larger antenna around it from an Bullseye tag (cut out the metal foil NFC logo from the center first), then you would see the same effect.
