Rogers RO4350B or RO4450 is the normal raw materials for high frequency PCB ( Rogers PCB )
Basically, Rogers Corporation is the company that manufactures the laminate materials to be used in high-frequency circuit boards for high functioning gadgets. Usually, Rogers pcb finishing in immersion sliver.

Rogers PCB Ro4350B high frequency PCB
Nearly all the circuit boards are made of Flame Retardant level 4 or FR4 materials which is a glass fiber and mix of epoxy composite laminated with copper foil on one or both sides.
Rogers sells the FR-4 core with copper laminates for the PCB, most importantly for the cores to have better frequency properties.
In some cases, they are even expensive than the fiberglass but less glossy at high frequencies which makes it ordinary for the RF circuit boards.
The Rogers PCBs are quite different from the general standard PCB and the reason is they have no glass fiber in the middle and mostly are ceramic-based.
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