[SI-LIST] Re: Experimental calculation of loss tangent and DK
- From: "Salkow, Steven" <steven.salkow@xxxxxxxx>
- To: raseel@xxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Tue, 11 May 2004 14:15:29 -0700
The relation of the amplitudes of the decaying sine waves of a tank circuit in
decay is directly related to the Q of the circuit. If your tank's C is the PCB
and a know value of L with a know Q is available (NBS) then the mesurements
will yield the loss tangent.
You need to choose a low value of L to yield results at the frequency of
interest.
Steve Salkow
Lockheed Martin
3200 Zanker Road
San Jose, CA 95134
(408) 473-4058 (san Jose)
(408) 742-4162 (Sunnyvale)
steven.salkow@xxxxxxxx
salkow@xxxxxxxxxxxx
(925) 462-1075 Home
(925-) 487-5946 Cell
(408) 468-7271 Numeric Pager
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of raseel@xxxxxxxxxxxx
Sent: Tuesday, May 11, 2004 1:58 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Experimental calculation of loss tangent and DK
Hi everyone:
I am a student in Binghamton University. I want to find the loss tangent and DK
of a material over a wide frequency range (0-12 GHz). In order to do so my
experimental setup consisted of two 2" by 2" metal planes with the material in
between. I then found the impedance vs freqeuncy reponse on the network
analyzer. I was able to find the postition of the first resonant frequency and
the 3dB bandwidth. from this how can I accurately calculate the loss tangent
and the DK of the material. A paper suggest using the formula (f2-f1)/f0 for
calculating the loss tangent
where f0 is the first resonant frequency
f1 is the lower 3 dB frequency
f2 is the upper 3 dB frequency
Is this valid? or is there any other way of calculating the loss tangent.
Please help
Raseel
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