Andy Burkhardt gave what I thought was a very clear and understandable 
     description of how stripline works.  Since I did not have the benefit 
     of exposure to what he is talking about in school, I appreciate being 
     able to grasp at least the basics in a way that makes sense, even if 
     it's only approximate.
     
     I did get lost in the estimation of the effective dielectric constant 
     for microstrip (Er'=3), which is made up of the dielectric constants 
     for air (Er=1) and FR-4 (Er=4), since the average of 1 and 4 is 2.5, 
     not 3.  Or, if you use the square roots, the square of the average of 
     the square roots of 1 and 4 is 2.25.  What am I missing?
     
     Gordon Davy

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