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26 The PCB Design Magazine • February 2014 PCB AND PACkAGING DESIGN UP To 50 GHz continues feature Figure 6: Measured (red and blue curves) and computed (green curves) gMS insertion loss (left plot) and group delay (right plot) for 6-inch stripline segments (Dk=3.8 (3.8% increase), lT=0.0117 (no change), Wideband Debye model, modified hammerstadt model with SR=0.32 um, RF=3.3 for copper roughness). Figure 7: gMS insertion loss (left plot) and group delay (right plot) for 6 inch differential strip segments computed with roughness losses included into dielectric model (blue curves with *) and with separated conductor roughness model (red curves with x).