[SI-LIST] Re: FR4 Permittivity
- From: "Lee " <leeritchey@xxxxxxxxxxxxx>
- To: <ray.anderson@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Feb 2013 10:05:39 -0800
This also depends on the glass to resin ratio. The data below is
incomplete. Get the proper data from Isola directly. Must know both
frequency and glass to resin ratio.
-----Original Message-----
From: Ray Anderson
Sent: Thursday, February 21, 2013 9:17 AM
To: si-list@xxxxxxxxxxxxx
Cc: Ray Anderson
Subject: [SI-LIST] Re: FR4 Permittivity
From the Isola 370HR data sheet:
Freq. Test Method Er
100 MHz (HP4285A) 4.24
1 GHz (HP4291A) 4.17
2 GHz (Bereskin Stripline) 4.04
5 GHz (Bereskin Stripline) 3.92
10 GHz (Bereskin Stripline) 3.92
-Ray
Raymond Anderson
Senior Signal Integrity Staff Engineer
Programmable Platforms Development
Silicon Technology Group
Signal Integrity and Package Development Department
Xilinx Inc.
2100 Logic Drive
San Jose, California 95124
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Havermann, Gert
Sent: Thursday, February 21, 2013 5:16 AM
To: cyril.chastang@xxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AW: FR4 Permittivity
This isn't good data.
First of all, they only tested only once (you can tell that there is no
variation in their Test results).
Second, they don't specify the test Method they used, and there are official
test methods giving totally wrong results (the old 1MHz plate capacitor
method @ 1MHz used to be quite inaccurate).
Third, the Data is measured at 1MHz, thus these values are useless for
speeds exceeding 100MHz
I recommend to go by the Datasheet (Isola is usually very good at dk/df
testing), or test it on your own, but 2.173 is physically impossible for
glass reinforced resin as the glass altready has a much higher dk.
BR
Gert
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