soft and hard board

Please , I'd like to know the difference between the softborad and hardbord which used in microwave

Hello nafah,


The name Soft & Hard board is used based on the substrate material type...

Soft Boards or Duroid Boards
Details:
Etch back process
Nominal conductor thickness 18 μm (? oz rolled Cu)
Drilled before etching for PTH and plate up
Drilled after etching and plate up for NPTH
Cutting tool to mill

Hard Boards or Alumina Boards
Details:
Plate Up process
Nominal conductor thickness 3-5 μm
Au Laser Drilled/routed
Thin film technology
Resistors TaN or NiCr


---manju---