Choosing PCB boards must strike a balance between meeting design requirements and mass production and cost. Design requirements include both electrical and institutional components. This material problem is often more important when designing very high speed PCB boards (greater than GHz). For example, the commonly used FR-4 material, the dielectric loss at several GHz frequencies can have a large impact on signal attenuation and may not be useful. As far as electrical is concerned, it is important to note whether the dielectric constant and the dielectric loss are combined at the designed frequency. If you still have problem, suggest you can ask material information for PCB fab. Most of PCB fab have their standard stack up and material information. ALLPCB.com, 4pcb.com, elecrow, etc.
