[SI-LIST] Re: what is the conductivity of a dielectric?

  • From: Greg Beck <gbeck@xxxxxxxxxxxxxxxxx>
  • To: <Patrick_Carrier@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 9 Apr 2002 13:27:22 -0700

 

I would contact some of the big laminate makers:

http://www.isolalaminatesystems.com [1]
http://www.parknelco.com/parknelco/ product.htm[2]
http://www.rogers-corp.com
http://www.ge.com/electromaterials[4]
http://www.taconic-add.com/
Greg Beck
VP Sales &Marketing
Optimum Design Associates-PCB Layout &Engineering
p 925.551.4155 x109
c 408.515.1070
www.optimumdesign.com[6]


>Transmission line gurus and people who love dielectrics--

>I am trying to figure out the conductivity of a dielectric.
>I have an equation that gives me:
>tanD = 1/(2*pi*Freq*Er*rd) where rd is the resistivity of the dielectric
>I assume that 1/rd is the conductivity of the dielectric. Is that an
>erroneous assumption?
>That gives me the equation:
>conductivity of dielectric = 2*pi*Freq*Er*tanD

>This second equation makes sense to me in that increasing your frequency
>increases the dielectric conductivity, causing more "leakage" of your
>transmitted energy. However, using this equation, that would indicate that
>the conductivity of a dielectric with Er=4 and tanD=0.02 would have a
>conductivity approaching that of copper at 100MHz. Now that does not make
>sense.

>Is there a such thing as non-frequency-dependent conductivity of a
>dielectric? How would I obtain such a number?
>Is there something else I am missing?

>Any guidance would be greatly appreciated. Thanks.
>--Pat




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   2 http://www.parknelco.com/parknelco/product.htm
   3 http://www.rogers-corp.com
   4 http://www.ge.com/electromaterials
   5 http://www.taconic-add.com/
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