I have a situation where I need to connect 10 flat cables (20 way, 0.625mm pitch) to special PCI-E card in my computer. They go from PCI-E card on back to drive bays in front of computer case.
Those flat cables are around 50cm length and come to PCI-E card in one group, from one direction. They look very neat, stacked one to another and taped to stick togeather. I've read that stacking flat cables largely increases EMI, maybe I should consider distancing them somehow?
I have experienced some problems with communication between nodes connected with flat cable and PCI-E card, which was realized to be EMI problem.
First, flat cables didn't have any kind of EMI protection. Then, I installed ferrite cores on both ends of the cables. That helped a bit, but there are still problems.
I have some ideas:
- Putting aluminum tape around cables and grounding it on metal case
- Separating and twisting flat cables as much as possible (tho that would look ugly and messy so I would like to avoid that)
- Distancing them with one from another with aluminum tape and foam tape
Are those good points?
What else can I do to get better EMI protection?