rf pcb layout
I think you need to do a fair bit of reading on this one. Not the simplest of things to get right. General principles are low impedance ground planes with earths at a common point. Different RF processes in their own screened sections, good filtering and stable supplies. For the most part you learn from your mistakes. I suppose good RF design and layout software would help. Sorry no recommendations as I do not do enough of it to feel qualified to advise.