433M/2.4G ISM RF signal coupling on PCB board?
You can use coaxial cables, along with attenuators, power combiner/splitters and directional couplers.
You can do it on a PCB, but the solution will be quite big and signals from different transceivers will couple to each other, unless you have a strict RX/TX scheduling.
A better solution would be optical transceivers + fiber, even for short runs inside an instrument.