[SI-LIST] Re: R: Relationship between loss tangent and dielectric constant's frequency dependence
- From: <colin_warwick@xxxxxxxxxxx>
- To: <gianguida@xxxxxxxx>, <neoflash2008@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 31 Mar 2010 10:03:47 -0600
Hi Giancarlo,
Yes, it's called the Kramers-Kronig relationship and it's related to the fact
that real materials have a causal response to EM stimulation.
I wrote a white paper on it here:
http://cp.literature.agilent.com/litweb/pdf/5990-5266EN.pdf
The wikipedia article is here:
http://en.wikipedia.org/wiki/Kramers%E2%80%93Kronig_relation
hth
-- Colin Warwick
Signal Integrity Product Marketing Manager, Agilent EEsof EDA
Please check out my blog http://signal-integrity.tm.agilent.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of gianguida@xxxxxxxx
Sent: Wednesday, March 31, 2010 5:46 AM
To: Neo; List Si
Subject: [SI-LIST] R: Relationship between loss tangent and dielectric
constant's frequency dependence
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charset="iso-8859-1"
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Hi,
the real and immaginary part of the permittivity are related each other =
trough the Hilbert trasformation
I have atatched a picture with the relation
=20
Unlucky my text book is in italian but I think that you will be able to =
find such relation also in other textbook
=20
Hope this helps
=20
Giancarlo
=20
________________________________
Da: si-list-bounce@xxxxxxxxxxxxx per conto di Neo
Inviato: mer 31/03/2010 4.23
A: List Si
Oggetto: [SI-LIST] Relationship between loss tangent and dielectric =
constant's frequency dependence
Hi,
This email's title is a bit long but it is exactly a question annoying =
me.=20
I'm trying to find out whether there is a proven relationship between a =
dielectric material's real part and imaginary part. Imaginary part is =
dielectric loss tangent. And real part is the dielectric constant.=20
For a material like FR4 or Rogers, their dielectric constants all change =
over frequency. And their loss tangents are also different.=20
Is there any inner relationship between the value of loss tangent and =
how the dielectric constant (real part) changes over frequency?
Thanks,Neo
=20
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