On 8/20/19 4:16 PM, Wes wrote:
I agree. Also when going to gold, most (all) commercial plating shops
will put down a nickle barrier on the base metal then plate with gold.
If the gold is too thin and the skin depth too deep, your gold surface
is RF wise, actually nickle.
I once designed a test station for X-band IMPATT diodes and we built the
prototype 1/4-height waveguide oscillator in-house and did our own
plating in the model shop. Since we were going to calibrate and supply
a number of these to our IMPATT vendors, we had the design replicated
and sent the plating job to an outside vendor. If you simply specify
minimum total plating thickness, you get lots of nickle and a flash of
gold. It took lots of hours to figure out why we weren't getting any
power output.
there's an excellent description of this on microwaves101.com in the
multitude of pages on skin effect.
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