PCB substrate properties

[yefj]

Hello,when designing impedance from PCB shown bellow
We need lots of parameters ,permitivity permiability conductivity of the coating etc..
I cant see this data in the product bellow.
Where can i find such substrate where i can see its parameters' so i can simulate its impedance properties?
Thanks.

https://www.amazon.com/McIgIcM-copper-laminate-circuit-100x70mm/dp/B01MCVLDDZ/ref=sr_1_4?crid=3F8NM85XGA9LV&dchild=1&keywords=pcb+board&qid=1605188357&sprefix=pcb%2Caps%2C324&sr=8-4

 

[KlausST]

Hi,

it says it is FR4 with 1.6mm thickness. Now you should be able to find "standard values".

For more precise values I recommend to buy at a reliable distributor. They should be able to provide more precise values.

Klaus

 

[yefj]

Hello Klauss, could you please recommend one PCB FR4 company i could start with?
I dont know anything about good precise value distributors.

 

[FvM]

What kind of transmission line do you design on a single sided PCB? The only option is coplanar, don't think that it's what you want.

You do't however need "lots of parameters" for a basic imepdance caluclation, just substrate thickness and permittivity. Industry standard FR4 has a rather wide Er spec, about 4.2 to 4.6.

 

[yefj]

i want to design in microstripline.
so i can order the shown bellow and assume 4.2 . Ok i will try it.

https://www.amazon.com/McIgIcM-copper-laminate-circuit-100x70mm/dp/B01MCVLDDZ/ref=sr_1_4?crid=3F8NM85XGA9LV&dchild=1&keywords=pcb+board&qid=1605188357&sprefix=pcb%2Caps%2C324&sr=8-4

 

[volker@muehlhaus]

The website says this is single sided copper. For RF PCB, we usually want to have solid copper on one side (ground) and do the routing on the other side.

 

[yefj]

Hello Volker, i have found this substrate.
The problem is with the SMA connector,its suppose to fit the width of the substrate(three legs)
Where can i find SMA connector with 1.5mm distance between the legs?
also could you recommend me a substrate with more accurate parameters?
Thanks

uxcell Double-Sided Copper Clad Laminate PCB Circuit Board, FR4 180x120mm 7.09x4.72 inch, 1.5mm Thickness DIY Prototyping PCB Board, Name Board, 5pcs: Amazon.com: Industrial & Scientific

uxcell Double-Sided Copper Clad Laminate PCB Circuit Board, FR4 180x120mm 7.09x4.72 inch, 1.5mm Thickness DIY Prototyping PCB Board, Name Board, 5pcs: Amazon.com: Industrial & Scientific

www.amazon.com

 

[BigBoss]

If you want to design a precise circuit, you should use branded PCB substrate such as Rogers or Taconic etc.Otherwise substrate parameters may have discrepancy lot by lot..

 

[vfone]

On cheap substrates the relative permittivity Er could change even on the same board if you move a bit around.

1.6mm PCB SMA connectors:
**broken link removed**