RF PCB with ro4350b+fr4

​Rogers material + FR4 high TG with blind vias PCB Stackup.
Storm Circuit can make such hybrid stackup PCB.
This is a 6 layer PCB ,Blind vias from L1-l2.

Below is the 3D image to show the control depth slot.
PCB spec:
Material:Rogers material RO4350B+FR4 (TG170)
Board thickness:1.45mm
Blind via:L1-L2
Min trace:0.1mm
Min space:0.1mm
Surface finish:Immersion Gold
​Impedance control,