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JUNE 2019 I DESIGN007 MAGAZINE 47 Huray is a much more recent method but requires input from a scanning electron micro- scope (SEM) to generate the loss figures. How- ever, note that it does not saturate with rougher surfaces, which is useful, as some laminates with high performance still have rough cop- per to promote adhesion. This is changing with newer materials, and chemical processes Figure 4: Low-, medium-, and high-loss materials versus frequency. Figure 5: Hammerstad modelling of roughness losses showing saturation.

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