Avner,
          
          You'll have to supply more information.  It's unclear what 
          you're really after.  The Dielectric Constant of a material 
          is "constant" for the most part at the frequency of concern. 
          Depending upon alot of other factors, like the frequency 
          you're working at versus how the dielectric was tested, you 
          could get different values.  Dielectric material has a 
          mathematical "complex" side to it.  Enough!
          
          It sounds like you're working some sort of calculation for 
          microstrip, buried microstrip, or stripline constructions 
          and getting different values for dielectricity.  That by 
          itself is NOT good.
          
          More info?
          
          doug


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Subject: Controlled Impedance - Dielectric Constant
Author:  [log in to unmask] at internet-mail
Date:    5/21/96 8:15 AM


          
Subject: Controlled Impedance - Dielectric Constant
          
I like to know if anyone found that Dielectric Constant, for the same 
material (e.g. FR-4),
 might be different when used for calculation of Microstrip or for
calculation of Stripline.
          
Avner Drory