The primary side has a high power RF transistor mounted in a cutout in the
PCB so that the transistor can be sweat-soldered to the copper plate.
There are a few other passive components and input/output microstrips on
the primary side connecting the transistor.

The secondary side is a solid GND plane which needs to conduct through to
the 2mm copper plate. The 2mm copper is a solid plate, not plated. It is
laminated to the secondary side of the PCB after PCB fabrication using a
conductive laminate (solder?).

The copper plate serves as a GND plane, and most importantly it transfers
heat from the high power transistors to a heatsink. The PCB cutouts allow
sweat-soldering of the transistors to the copper plate. The copper plate
side of the board is then attached directly to a heatsink.

------- cutout -------  Primary Side Copper
=======        =======  RO4350B Dielectric
-------        -------  Secondary Side GND Plane
......................  Conductive Laminate (solder?)
//////////////////////  2mm Copper Plate

]]]]]]]]]]]]]]]]]]]]]]  Heatsink


Hope this clarifies the application.


Mark


On Tue, August 28, 2007 4:00 pm, George Patrick wrote:
> So...
>
> You want a .031 [1.2] substrate with .079 [2.0] of copper plating on the
> secondary side...  What is on the primary side?  Is the ~11 oz plating
> on the secondary side etched or just a solid copper surface?
>
> Methinks there has to be more to this story :)
>
> --
> George Patrick
> Tektronix, Inc.
> Central Engineering, EDS Applications Support
> P.O. Box 500, M/S 39-512
> Beaverton, OR 97077-0001
> * 503-627-5272 (voice)     * 503-627-5587 (fax)
> http://www.tektronix.com    http://www.pcb-designer.com
>
> "Off-Grid and Proud of it!"
>
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Mark
> Koitmaa
> Sent: Monday, August 27, 2007 15:41
> To: [log in to unmask]
> Subject: [DC] Lamination to Copper Plate
>
>
> Can anyone recommend a fab house that is able to laminate a 1-2mm thick
> copper plate to the seconday side of a two layer Rogers RO4350B .031"
> PCB?
>
> Thanks in advance,
> Mark Koitmaa
>
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