> > Flat copper conductors present a lower inductance path than round
> ones!
>
> Can you give me a reference for that? I've been looking for years,
> and find no data on conductor shape vs inductance.
>
I can Tom. Its a pretty well known fact in the industry that
ribbon conductors have lower inductance than round wires of the same
cross sectional area. In fact, the inductance of a ribbon of a given
width is roughly equivalent to the inductance of a round wire with
diameter equal to that width. In other words a 1" wide ribbon conductor
would have about the same inductance as a 1" diameter wire!
The equations are:
L=200*len*(ln(4*len/d)-0.75) for round wire
and
L=200*len*(ln(2*len/(a+b)+0.5) for ribbon
where:
L = inductance
len = length of wire
d = diameter of wire
a = width of ribbon
b = thickness of ribbon
The reference can be derived from data in Magraw Hill
Electronics Engineers' Handbook.
regards,
Dave
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