[SI-LIST] Re: Relationship between loss tangent and dielectric constant's frequency dependence
- From: "Hall, Stephen H" <stephen.h.hall@xxxxxxxxx>
- To: Neo <neoflash2008@xxxxxxxxx>, List Si <si-list@xxxxxxxxxxxxx>
- Date: Thu, 1 Apr 2010 09:24:53 -0700
Neo,
This is discussed in detail in chapter 6 of the book "Advanced Signal Integrity
for High Speed Digital Designs" by Stephen Hall and Howard Heck. Page 249. It
includes the derivations, design worthy formulas and methodologies.
I hope it helps.
Steve
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Neo
Sent: Tuesday, March 30, 2010 7:24 PM
To: List Si
Subject: [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.
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.
For a material like FR4 or Rogers, their dielectric constants all change over
frequency. And their loss tangents are also different.
Is there any inner relationship between the value of loss tangent and how the
dielectric constant (real part) changes over frequency?
Thanks,Neo
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