RE: [SI-LIST] : RF boards

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From: Knighten, Jim L (JK100005@exchange.SanDiegoCA.NCR.COM)
Date: Fri Apr 28 2000 - 11:02:22 PDT


Sean,

As frequencies get high, the loss (loss tangent) in the board material
becomes significant. This is a separate parameter from Dk. So, at high
frequencies, signals will incur copper losses on signal traces and
dielectric losses in the board material. Dielectric losses can be
comparable to copper losses, or even higher if loss tangent is high.

Jim
________________________________________________________
Dr. Jim Knighten e-mail: jim.knighten@ncr.com
<jim.knighten@ncr.com>
Technical Consultant - Design
NCR
17095 Via del Campo
San Diego, CA 92127 http://www.ncr.com <http://www.ncr.com>
Tel: 858-485-2537
Fax: 858-485-3788

                -----Original Message-----
                From: Sean Murray [mailto:seandm@mmspec.com]
                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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