John,
     
     As Chairman of the committee responsible for this document, I feel a 
     certain "ownership" to this problem. At our last meeting in Naples, 
     the committee members identified various formulae with either printing 
     errors (subscript or superscript) or outright errors. It's difficult 
     to trace how the outright errors occur, especially after the fact.
     
     Now that you know all this, I've taken to looking through some 
     references here and none have "embedded microstrip". I can find only 
     microstrip or stripline or generic notations. 
     
     If you'd like copies of what I have, please email me individually or 
     call. In the meantime, I'll keep looking!
     
     Happy Holidays to all the `Net community!!!
     
     Regards,
     
     Tom
     
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     Tom Bresnan                        
     Product Engineering Manager        714.951.3388 
     MULTEK                             714.951.8794 FAX
     16 Hammond                         [log in to unmask] 
     Irvine, CA 92718 USA               http://www.multek.com
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______________________________ Reply Separator _________________________________
Subject: DES:  Embedded Microstrip IPC-D-317A
Author:  [log in to unmask] at INTERNET_GATEWAY 
Date:    12/18/96 10:05 AM
     
     
     
     REF IPC-D-317A:
     
     In section 5.5.2.1, there appears to be an error in the theoretical 
     calculated capacitance.
     
     If I use nominal values for equation (5.35):
     
     DK = 4.5
     H = 0.020
     T = 0.0012
     
     I try to take a ln of a negative number.
     
     Can someone enlighten me as to what the correct equation should be?
     
     TIA,
     
     John R. Kretsch, P.E.
     Sr. Engineer, Design Assurance
     ADC Broadband Communications
     [log in to unmask]
     
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