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Microstrip Surface Roughness

Question asked by LI04124 on Oct 6, 2008
Hello everybody,

the MSUB substrate uses Hammerstad's formula to calculate the increase of metalization losses due to surface roughness.

If I understood right, also very rough surfaces can increase metal losses only by factor 2. Is that right?
What's the scope for the roughness parameter?

In my application I can have roughness values that are several times bigger than skin depth and up to approx. one quarter of the metal thickness.

Does anybody have more experiences with this topic?

All help will be much appreciated!!!

Best regards,