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Ixiasoft
1.4.1. PCB Material Selection
- Select the material with the lower loss tangent to reduce signal attenuation from dielectric losses.
- Always choose lower Ɛr with a flat frequency response for best signal performance and to reduce signal dispersion that adds phase jitter.
- Always choose more densely woven fiberglass style for the core and prepreg material surrounding the high speed signal layers for more uniform Ɛr that minimizes impedance and signal velocity variations.
- Choose sparsely dense fiberglass styles for power layers and slower general purpose signal layers to reduce PCB cost.
- Use wider traces and choose rolled copper foils over traditional electrodeposited (ED) copper foils in the PCB construction to mitigate conductor loss.
- Certain simulation tools may not include loss effects from surface roughness. In these cases, the correction factor (KSR) must be added to get realistic prediction of the actual loss.