Hello, i have a question about antenna on PCB, the datasheet show me Grounding of C9 capacitor MUST be isolated
from ALL ground layers except the bottom ground layer, I see the PCB example, Antenna reference layer is buttom layer, but my PCB is four layers and use the the second layer as reference layer, so do i need to connect it to the buttom layer straightly? or just need to connect to the second layer.
