I know the basic design requirements for pcb trace antenna, no ground place below or above the traces, impedance matching etc. But the design layout recommendations for pcb antenna doesn't seems to answer my question.
My circuit is very small and I also have multiple PCB stacked one above the other (similar to the iphone X motherboard).
My question is what is the safe distance from the trace pcb antenna to other vertical grounds? i.e. imagine i have 3 pcb 1.6mm stacked one above the other with the top being the antenna. Can I have a GND place on the bottom pcb, between 3.2 and 4.8mm below the trace antenna?
Edit: Found this SMD antenna that they say that doesn't require GND clearance: 2.4 GHz SMD On-Ground Antenna