Jim,

 It probably would be better to solder the entire bottom of the filter case
to the plane at that frequency.  I wouldn't use Ag epoxy. If there is solder
already there from a previous attachment you would be looking at an
increasing resistance over a fairly short period of time (weeks to months).
As ENIG you will have a similar problem over a much longer period of time,
as you will get some Ni oxide growth.  If you use electroless or
electroplated Au greater than say 20u inches you could use Ag epoxy provided
that the filter also has a compatable Ag epoxy surface.

Bruce Misner
> ----------
> From:         Jim Kittel[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.
> Sent:         Thursday, October 11, 2001 11:26 AM
> To:   [log in to unmask]
> Subject:      [TN] Attaching Microwave Components
>
> Hello Tec Netters,
> We are de-buging a new circuit board containing a microwave filter
> operating
> in the 2 - 3 Ghz range.  This filter was soldered around the perimeter of
> the case to the ENIG ground plane using 63/37 eutectic.  The engineer is
> stating that electrically the filter does not appear to be adequately
> grounded to that plane.  I am wondering if there is a better way to attach
> these filters?  Would it be better to solder the entire bottom of the
> filter
> case to the plane?  Is anyone using conductive epoxy?  Liquid or sheet?  I
> would appeciate comments.
> Thanks,
> Jim Kittel
> L-3 Communications
>
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