If you decide to use the Rogers substrate, please be advised that the
RO4003 is not fire retardant and cannot be UL approved. This limitation
may impact the UL approval of your product. Rogers does produce a
substrate that is UL approved with a slightly higher dielectric constant
of 3.48 as compared with the 3.38 of RO4003. This will result in a
slightly lower impedance, so be sure to recalculate your trace width and
dielectric spacing if you use the RO4350. If you need assistance with
the calculation of impedance for Rogers materials, visit their Web site
at:
http://www.rogers-corp.com/mwu/mwiform.htm
I highly recommend the Rogers line of substrates.

Chris Taylor
Senior PC Designer
LXE, Inc.
125 Technology Pkwy.
Norcross, GA 30092
e-mail: [log in to unmask]
Home Page: http://www.elmg.com
(770) 447-4224 X3242 Voice
(770) 447-6928 FAX


>----------
>From:  KELLY M SCHRIVER[SMTP:[log in to unmask]]
>Sent:  Thursday, January 28, 1999 4:27 PM
>To:    [log in to unmask]:
>Subject:       [DC] RF Materials
>
>Hi All -
>
>I'm working on an evaluation of a potential new design, which will end up
>with
>one small RF car in it.  The customer recommends either Taconic RF35 or
>Rodgers 4003.
>
>Would greatly appreciate and commentary regarding design peculiarities, board
>fab houses and any specialized assembly process issues for surface mount.
>
>Any and all inputs would be appreciated.
>
>Regards - Kelly
>
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