Colin,
microwave cap manufacturing/designing/using is sometimes an uncertain world, I'd say. Varian specialist like you ought to know more than most of us. So, I guess you have some of the tricky things under focus already: hotspots, metal spiking, edge leakage, cooling, impurity caused losses, humidity sensitivity, etc.
Organic RF/HV caps, that's odd. What do you do when your organic cap sucks moisture from the surrounging? Most such caps are ceramic...well, well, you know all that...
Tips: when we had some serious cap problems, we contacted John Maxwell off line.
There is an interesting discussion page about life of organic dielectric:
http://www.altair.org/projects/hawgcapemail.htm
and for those who really want to dig about dielectrics:
http://infmweb.fi.infn.it/docs/pacs/spec80.html
You'll certainly do well with all those advices you've got from TN, especially if your cap is not a power cap..and the ceramics are too expensive?
Ingemar
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Colin Weber
Sent: den 23 augusti 2004 00:53
To: [log in to unmask]
Subject: Re: [TN] Search for HF Laminate Material
Hi Phil,
I tried that link at the time and it didn't work so I trashed it. Maybe
there was
a problem with our Intranet at the time. Do you still have that link?
Tim and Ingemar,
We are not using embedded/buried capacitors. The capacitance we wish to
achieve is
on external layers using copper pads. We succeed with the rogers non-UL
material.
Now we need to replicate the results with a UL material. We are looking to
create
a capacitance of 0.25pF and these are used in sampling 3.5kV of RF. We do not
know precisely what didn't work with the UL Rogers material and why the non-UL
did work. At this stage we are just trying different materials and looking
at end results for our application, of which I am unable to describe in detail.
Colin
At 01:44 AM 8/21/2004, you wrote:
>hi,
>
>a couple days ago a url was provided that presented a very extensive table of
>properties for several vendors laminate products. did you check there?
>
>phil
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