Re: [SI-LIST] : lossy sprays for stripline

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From: Pat Zabinski (zabinski.patrick@mayo.edu)
Date: Fri May 05 2000 - 12:14:12 PDT


I forget who makes it, but Echosorb or some other form of
EM-absorbing material should work pretty good, although it
does have some ferrites buried within it, which will tend
to shift the frequency around a bit.

Pat

C Deibele wrote:
>
> Hi,
>
> Background:
> I have an application where I made a resonator circuit in a stripline
> configuration.
>
> The resonator circuit has a Q of about 80.
>
> I can disassemble the stripline (i.e. the top board is not laminated),
> so this means
> that I have access to my traces.
>
> I want to have a Q of about 55.
>
> I cannot add any lumped elements in my application.
>
> Question:
> Does anyone know of a lossy spray I can spray over my traces to slightly
> de-Q my
> tank circuit?? I have the ability to "tune" the Q, that is to say, I
> can disassemble my
> circuit, spray the substance, assemble, measure, and repeat as
> necessary. I think a spray
> might have an advantage in that it shouldn't change the geometry of the
> stripline significantly.
>
> Or perhaps someone knows of some other method I can do??
>
> Note that I cannot change my substrates to utilize a higher loss
> tangent.
>
> Thank you,
>
> Craig Deibele
>
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