High class impedance board

Layers     6L
Structure:2R+2F+2R
Thickness   1.0mm
Out Layer Copper Thickness: 1 OZ
Inner Layer Copper Thickness:1 OZ
Min hole size:0.3mm
Min Line Width/Space:  3mil
Surface finish:ENIG
Product use :Bluetooth headset
Difficulties:High quality of impedance matching