We use both Rogers materials, but make no caps.
You did not mention whatparameter did not work.

Anyway, compare with this one:

moisture uptake:  0.15
epsilon  1 M      3.3
ditto    1 G    4
tand                  0.02
Tg                      320 C
useful          280 C
lambda          1.9 W/mK
diel stab               100 ppm
asperity                0.1 um
 min diel layer 30 um
xy                      20 ppm
z                       100 ppm

Name: Vectran

Not equiv with R, but depends on what you look for.


got a lot about V, send you offline

Ingemar Hernefjord
Ericsson Microwave Systems


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Colin Weber
Sent: den 20 augusti 2004 06:37
To: [log in to unmask]
Subject: [TN] Search for HF Laminate Material


Hi Folks,

Does anybody know of a material which can meet or exceed the
following specifications for a Rogers RO4003C, which has UL
approval (94V-0)?

Dielectric Constant 3.38 +-0.05
Dissipation Factor tan 0.0027/0.0021
Temperature Coefficient +40 ppm/deg. C
Coefficient of Thermal Expansion x=11, Y=14, Z=46 ppm/deg. C
water absorption 0.04%

FR4 standard Processing

The application is for making capacitors out of PCB material.
The Rogers RO4350B UL material did not perform as well as the
RO4003C.



Regards,

Colin Weber

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