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,
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