The ground layer is very important in RF PCB design, as the ground plane makes up half of the antenna. Antenova recommends considering the following to ensure grounding techniques for optimum RF performance:
· The return path in the RF signal is in the ground plane. It should be uninterrupted and as wide as possible.
· Completely dedicate a layer for ground.
· Ground any unused areas in the top and bottom layers. Connect them with as many vias as you can (while keeping the distance between vias not more than one-twentieth of the wavelength).
· Make sure that the ground plane beneath the RF trace is wide so it behaves like a microstrip and does not have any signal leakages.