I was able to find two old papers in the "Proceedings of the I.R.E." cited by Terman
on the subject of inductance calculation; a general formula for the inductance of a
single turn loop of (almost) any shape was proposed by Bashenoff in an article of
November, 1928 and later verified also by Kalantaroff and Worobieff in another
article in December, 1936.
A simplified version of the formula is:
L = 0.2 * p * ln((4 * S) / (d * p)) [uH] (all dimensions in meters)
where p is the perimeter of the loop, S its area and d the wire diameter. The maximum
error should be a few percent maximum for most shapes.
A comparison of this formula with the other proposed for rectangular
loops can be found at http://www.qsl.net/in3otd/rlsim.html
73, Claudio IN3OTD
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