You have the similar problems I just encounter while going through the formulae of those transmission line
configuration.
Three book references that I refer to give me variations in the formulae not to mention what you have just
described.
I just don't understand why such standard formulae can have variations. Anyone wish to comment?

Regards.

Larry Martin wrote:

> Hi.
>
> I recently bought a copy of IPC-D-317A.  Page 24 in section 5.5.5.1
> shows equation 5.42a) for differential stripline impedance Zo with the
> exponent "-.6B".  Could I have a definition of "B"?  Is it a ratio of
> two physical parameters?
>
> Section 5.5.4.1 (also on page 24) has "B" defined as "Height above
> reference plane", but it also has "H" defined exactly the same way.  So
> I don't know what to make of "B".
>
> Also, which reference in the Bibliography on page 69 applies to this
> issue?  I would like to acquire it and read it.
>
> Thank you very much for your help.
>
> Larry Martin
> Compaq Computer Corp.
> Colorado Springs, CO
> 719/548-6877
>
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