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Re: [Amps] mounting (UHF) RF powermodules

Subject: Re: [Amps] mounting (UHF) RF powermodules
From: Steve Thompson <>
Date: Mon, 24 Mar 2008 08:23:23 +0000
List-post: <">>
> Carel , If this module is a ceramic substrate or even a soft substarte with
> smll ceramic carriers , on a copper slab or some other sort of slab of
> powdered metal -....

The substrate in these is alumina, so it's important to follow 
Hank's comments. Expanding on those, any heatsink you buy will not 
be flat enough without machining, ideally with a large diameter 
'fly' cutter. You are also looking for a good surface finish with 
machining ridges barely detectable with a fingernail. As well as 
flat (50um or .001" over the module area) clean is important. No 
swarf, grit, hairs or solder splashes under the module.

Skimming the heatsink will also give you a bare metal surface for 
good rf contact between the flange and the metalwork. The common 
black finish is an insulator.

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