One of the more common problems faced by designers of RF and microwave equipment who incorporate multiple PCBs is connecting the boards directly together so that the RF signals are transmitted properly between PCBs. This problem occurs because standard coaxial connectors are rigid and soldered to the PCB in fixed locations. Thus, the tolerance buildup in mounting multiple connector pairs prevents the connectors from aligning correctly for proper mating. The traditional solution to this problem is to mount the boards separately and connect them with costly and cumbersome cable assemblies to compensate for the misalignment. This method adds size, complexity and expense to the equipment and could be avoided if the PCBs could be connected directly to each other.
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