According to FMCCOMMS5 EVB, the LO traces are on layer 1 and layer 3. However, the trace width on layer 1 and layer 3 appear to be the same, about 15 mil wide (which is 50 ohm trace on layer 1). But the 50 ohm trace on layer 3 should be about 3-5 mil wide only.
Does this mean the LO trace does not need to be 50 ohm? Or it should be 50 ohm all the way but the EVB designer overlooked this issue?