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4 layer RO4350B PCB with blind and ENEPIG designed by High Speed Intergated Circuits Lab. This PCB material is all Rogers 4350B 6.6mil, the stackup is as below. TOP Core RO4350B 6.6mil L2 PP RO4450F 8mil L3 Core RO4350B 6.6mil L4 Total thickness is 0.7mm The key technology is the pad size is the same as trace with only 4mil .and the PCB finish is ENEPIG ,and blind vias. Also,blind vias from L1-L2, L3-L4. min hole 0.15mm. 4mil trace /space and the pad size too at the main chip zone. Storm Circuit makes a lot of RF/High Frequency PCB with ENEPIG and Blind vias or buried vias ,from 2 layer to 12 layer RF PCB,high speed intergrated circuits .
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