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Well I tried a 3 micron roughness on all surfaces of the loop and the copper loss went up by 60%. It seems pretty clear this is the root of my problem and I will probably just tweak the value until my model matches the data unless I am able to find parameters for my copper.
By the way, there...
I would never have thought that would affect me at 400MHz, but since I see a worst case of 3u roughness in the Rogers' document, and skin depth is also about 3u, it now seems very plausible. I am presently using the outer layer of an FR4 substrate (plated up to about 3mils over original 1oz...
I am making 400MHz small loops and HFSS is not predicting the same copper loss I am measuring. My hardware shows 2 to 3 times the loss that HFSS predicts. I am not solving inside the copper. It seems like the skin depth approximation should be adequate, but is there something I am not setting...
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