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Design >> RF Design >> what is the thickness of each layers of 4 layer 0.062 inch?
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Message started by liletian on Aug 22^nd, 2010, 6:10pm

Title: what is the thickness of each layers of 4 layer 0.062 inch?
Post by liletian on Aug 22^nd, 2010, 6:10pm

Hi Guys
I am thinking to use advanced circuit (4pcb.com) service to make tranmission line (MLIN 50 Ohms). However, I can not find info on each layers. If anyone can give me a link or supply info on thickness of each layer, it will be greatly appreciated.
I found the following info on the website.
4-Layer PCB - 0.062" finished thickness

Layer 1 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.0115"-0.0129" thick - Dielectric Constant of 4.6
Layer 2 - Copper - 0.0014" thick (1 oz. copper weight)
Core material - 0.028" thick - Dielectric Constant of 4.7
Layer 3 - Copper - 0.0014" thick (1 oz. copper weight)
Laminate (prepreg) - 0.0115"-0.0129" thick - Dielectric Constant of 4.6
Layer 4 - Copper - 0.0014" thick (1 oz. copper weight)

Please comments how accurate it is. I added all the layer's thickness together and found it is less than 0.06 inch.
thanks

Title: Re: what is the thickness of each layers of 4 layer 0.062 inch?
Post by loose-electron on Aug 31^st, 2010, 10:42am

contact the manufacturer.....

Title: Re: what is the thickness of each layers of 4 layer 0.062 inch?
Post by rfcooltools.com on Sep 1^st, 2010, 1:22pm

liletian,

Around 50 to 60 mils is pretty common for a four layer pcb,
Remember that the inner copper layers don't add total height since the prepreg fills the space around the conductor.

http://rfcooltools.com