applications typically require laminates with specialized electrical, thermal, mechanical, or other performance characteristics that exceed those of traditional standard FR-4 materials
when PCB material selection was simple? For run of the mill applications choose "vanilla" flavored FR4 and for high speed applications, perhaps either a ceramic loaded core or PTFE based substrate.
The features of high frequency PCB as following:
1. DK should be small and stable enough, usually the smaller the better, high DK may lead to signal transmission delay.
2. DF should be small, which mainly affect quality of signal transmission, the smaller DF could make smaller signal wastage accordingly.
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