RE: [SI-LIST] : RF boards

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From: Ron Miller (rmiller@Brocade.COM)
Date: Fri Apr 28 2000 - 13:12:21 PDT


The dielectric loss tangent dominates high frequency losses
at frequencys above 1 Ghz. Since most digital signals these
days have edge rates which generate components much higher
than 1 Ghz, the edges are distorted if you have lossy material.

Roln MIller

> -----Original Message-----
> From: Sean Murray
> Sent: Friday, April 28, 2000 10:31 AM
> To: si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : RF boards
> Importance: High
>
> Ron,
> I do not see much of a difference between the nelco 4000 and
> Getek. Is there some variable that I'm missing that plays a big part in
> the performance at the RF levels other than the DK?
>
>
>
> > -----Original Message-----
> > From: Ron Miller [mailto:rmiller@Brocade.COM]
> > Sent: Friday, April 28, 2000 10:02 AM
> > To: 'si-list@silab.eng.sun.com'
> > Subject: RE: [SI-LIST] : RF boards
> >
> >
> > Hi Sean
> >
> > I have done some work substituting Arlon 350(teflon with
> > ceramic loading)
> > for FR4 and have
> > been able to double the bandwidth of previous generations.
> > Going from FR4
> > to Getek will
> > not get you much, but if you go to Nelco 4000-13SI, you can
> > expect a big
> > improvement in
> > the frequency dependent losses.
> >
> > Good luck
> > Ron Miller
> >
> >
> > > -----Original Message-----
> > > From: Sean Murray
> > > Sent: Friday, April 28, 2000 7:58 AM
> > > To: 'si-list@silab.eng.sun.com'
> > > Subject: [SI-LIST] : RF boards
> > > Importance: High
> > >
> > > Anyone have any feelings on what subtle differences when
> > fabricating a
> > > board can do to an RF board. Such as going from FR-4 to
> > Getek; 50/200
> > > gold/nickle vs. 30/100 gold/nickle. Is there any books out
> > there that
> > > deal with strictly the layout of RF boards??
> > >
> > > Regards,
> > > Sean Murray
> > > Sales Manager
> > >
> > > M&M Specialties Inc.
> > > 1236 W. Southern Ave. #106
> > > Tempe, AZ. 85282-4518
> > > Phone: (480) 858-0393 x105
> > > Cell: (602) 684-7859
> > > Fax: (480) 858-1882
> > > Email: seandm@mmspec.com
> > > WWW.mmspec.com
> > >
> > >
> > >
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