It's called Dissipation Factor. For example, Nylon, Delrin and Vinyl
are excellent insulators at 50Hz, but at 50MHz they are not.
On Jul 12, 2006, at 2:13 AM, Peter Chadwick wrote:
> Rich said:
>
> >Unlike barium-titanate dielectric (ceramic) doorknob capacitors,
> whose current carrying ability increases from 5MHz to 30MHz, mica
> dielectric caps' current carrying ability decreases above 5MHz.<
>
> Yes, but WHY? What's the mechanism that allows mica to be a
> perfectly good insulator in other application, way way up in
> frequency?
>
> 73
>
> Peter G3RZP
>
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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