What is RF PCB?

RF stands for "radio frequency".RF PCBs is also called high frequency PCB, are one of the fastest growing sectors in PCB manufacturing. With proliferation of IoT sensors, wireless electronics, and smartphones, RF PCB is getting more and more popular.any board that operates above 100MHz to be an RF PCB.and anything above 2GHz is a Microwave PCB.

Radio frequency (RF) and microwave (MW) circuits can be found in wireless products from handheld devices for medical and industrial 

applications to advanced communications systems for base stations, radar and global positioning.

Check here:About how to select the appropriate RF PCB Material
Check here:Why used Mixed Dielectrics for some High-Frequency PCB Applications