What is the size for FR4 @ ~$2.75 for .021 core material? For a 4x6"
4layer FR4, what is the likely price? Thanks,
Yuan
On Tue, 2 Jun 1998, Mitch Morey wrote:
> Art,
>
> First, thank you so much for following this thread on Hi-Freq materials
> and giving us the suppliers information.
>
> I have been working with these issues the last couple weeks and want
> to give some input I've collected.
>
> I hear very good things about Rogers material, and have no complaints
> with using it, if necessary. But, some info has crossed my hands, and I'm
> not sure I have need for what Rogers can give me, for a cost $$.
>
> I had a couple board manufactures in here, and the rep from GE (makers
> of Getek material. The fab shops have no qualms using Getek, and the
> costs are very much in line with FR4 material processing. Maybe 15-20%
> more per lot. But, I have published data from GE concerning Getek
> material up to 12Ghz. And, they supply a spreadsheet so you can
> calculate your own stackups, with whatever frequencies you use to
> give you your impedance values. With this, I can do my 2Ghz design on
> Getek material, and quite possibly acheive +/- 2% tolerance! They also
> market an impedance "simulator" which goes WAY beyond any
> impedance "calculator" I've seen available. By simulator I mean it will
> simulator all the factors effecting your stackup, not just layer to layer! I'm
> working to purchase it ASAP. It's very impressive.
>
> Now, for costs... From what I could gather Getek material ($4.07) is not
> quite 2X as much as FR4 material (~$2.75 for .021 core material), and
> Rogers 4003 material ($9.95) is not quite 4X FR4 material. These values
> are disputable, as they will change from supplier to supplier, and from
> quantity to quantity, but those are value we currently look at.
>
> As I said, I like all these materials, for whatever application they apply to,
> but at 2Ghz (and any impedance designs, now) I'll use the Getek
> material. If it doesn't work, I'll surely go back online and bitch.
>
> Thanks again Art. :)
>
> Mitch Morey
> Sr PCB Designer
> NSI Communications
> San Diego
> (619)657-5338
>
> >>> "Arturo J. Aguayo" <[log in to unmask]> 06/02/98 07:12am
> >>>
> Frank,
>
> You are correct in that each application is different and one can use
> FR4 in some applications greater than 1 GHz. Loss is an important
> factor, but we have seen designers switch from FR4 to a high
> frequency
> material because of dielectric tolerance too. That I'm aware of, there
> is no tolerance (or at least published) in dielectric tolerance for FR4
> or many other high Tg materials, only on those designed specifically for
> RF/microwave applications. Because of that fact, some FR4 boards
> require
> much tuning to get them to work, this adds overall cost to the finished
> circuit and in some cases it is cheaper to got to a more expensive
> laminate and eliminate tuning. Each application is different and if I
> were desining a board I would give FR4 a shot also. Let's face it, if it
> works after looking at all costs then there is nothing that somebody
> like me (working for a supplier of high frequency laminates) can say to
> convince you to switch away from FR4 (but there are cases down to
> 500
> MHz, digital, where the change has happened).
>
> regards
> Art Aguayo
> [log in to unmask]
> www.rogers-corp.com/mwu/
> [log in to unmask] wrote:
>
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