Good Day To All,
We recently fabricated a surface microstrip flex circuit with 50 ohm +/- 2.5 ohms (results were good). The impedance traces were not covered with solder mask or coverlay but were plated with ENIG. The next part is where I need the help. The circuit runs at 20-26 Ghz. Customer says the return losses from the S-parameters measurements are good but the insertion losses are not (quite frankly I have no idea what this means) . Could the nickel plating be causing this issue?
Thanks.
Steve Kelly
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