AlliedSignal Laminate Systems in the US has discontinued ED130
laminates, but ED130 thin laminates and prepregs are still manufactured
in Europe and Taiwan.


Manfred Huschka
AlliedSignal Laminate Systems Europe
 ----------
Von: [log in to unmask]
An: [log in to unmask]
Betreff: Re: AW: Dielectric Constant-1 -4 gigaHz
Datum: Donnerstag, 5. Dezember 1996 17:10

Microsoft Mail v3.0 (MAPI 1.0 Transport) IPM.Microsoft Mail.Note
From: [log in to unmask]
To:  [log in to unmask]
Subject:  Re: AW: Dielectric Constant-1 -4 gigaHz
Date: 1996-12-05 17:10
Priority: 3
Message ID: C4107F6DE34ED011B4CF00805FD4C991

 -----------------------------------------------------------------------
----- --

     careful of ED-130 this material is no longer being made by Allied
     Signal and is getting tuffer and tuffer to get.  We have found that
     FR404 gives us a very similar DK to ED130.  The stack up of the
layer
     is very important because a change in the stack up can change your
DK.


______________________________ Reply Separator
_________________________________
Subject: AW: Dielectric Constant-1 -4 gigaHz
Author:  [log in to unmask] at _internetcc
Date:    12/5/96 12:57 PM


The dielectric constant of 0.71 mm epoxy/glass laminate is 4.8 at 1 Mhz,
4.6 at 1 GHz and 4.57 at 8.5 GHz. Due to the nature of the base
material, a composition of E-glass (DK of 6.6 at 1 MHz) and epoxy resin
(DK of 3.6 - 3.7 at 1 MHz), and a retained resin content of the laminate
of approx. 40 %, the value will not change even when using a different
laminate from another supplier. We have measured DK values for

 ED130 (difunctional epoxy, min Tg 130 Deg C)
 FR404 (multifunctional epoxy, min Tg 150 Deg C)

and found no difference within normal measuring tolerances.

Comparing the behaviour of FR4 to that of BT-Epoxy (e.g. G200) it has to
be noted that the slope of DK drop at higher frequencies is not as steep
with BT-Epoxy.


Regards

Manfred Huschka
AlliedSignal Laminate Systems Europe

 ----------
Von: [log in to unmask]
An: [log in to unmask]
Betreff: Dielectric Constant-1 -4 gigaHz
Datum: Donnerstag, 5. Dezember 1996 00:49

Microsoft Mail v3.0 (MAPI 1.0 Transport) IPM.Microsoft Mail.Note
From: [log in to unmask]
To:  [log in to unmask]
Subject:  Dielectric Constant-1 -4 gigaHz
Date: 1996-12-05 00:49
Priority: 3
Message ID: B99511B7194ED011B4CF00805FD4C991

 -----------------------------------------------------------------------
 ----- --

hi,

one of my customers have built a 4 layers board as follows:



                  ____________________________18 MIC COOPER  (1/2 oz)

                   ========================
                   ========================   3 X 7628
                   ========================
                   ---------vcc-------35 mic cooper  (1 oz)

                      0.711mm   CORE
                   ----------gnd-------35 mic cooper
                          SAME AS ABOVE

with multifunctional resin type materials, it's tg is 140 c.

the end-user of this board have not specified any controlled impedance
tracks , BUT some signals do carry 0.7 giga to up to 4 giga !!!

could someone advise what is the dk of the epoxy at those rates,

should other materials be used then std. epoxy resins  (fr4 -gfn)


any comment would be appreciated.



Yisrael Leshman
Octava Marketing
zichron-yaakov
ISRAEL
[log in to unmask]

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