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Original Message

coil capacitance

Posted by Arbelos on April 29, 2002 at 13:48:49:
If you look at the factors of coil capacitance you see that it necessitates a potential difference between twoconductor areas, with a dielectric in between.
Adjacent windings, with their prop. low ESR an L between, therefore contribute proportionally less than farther away windings. Conventional coils lay winding beside winding and then start a new 'layer'. So potential difference between these layers is considerably higher than in a foil coil. Actually the very 'organized' winding helps to shield the dielectric from farther windings.
Therefore i suspect that foil coils have rather *less* problems with coil capacitance than conventional coils.
If there would be any problem, there would be a sharp impedance peak at a relatively low frequency. I've never seen such in any measurement.