ESR,ESL for common capacitors

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Does anyone have suitable equivalent series R and L for common TC 
capacitors (as one might use in Spice, for instance)?

I ran a quick calculation using the dissipation factor for the Ceramite 
715C type (2% DF -at- 1kHz)..

If you turn C into X and calculate it as DF = R^2/(R^2+X^2) a 2000 pF cap 
has an ESR of about 11.4K (-at- 1 kHz)..

If DF stays constant with frequency, then R would be proportional to X, and 
hence 1/F (i.e. at 100 kHz, ESR would be 114 ohms).  I don't think this is 
necessarily realistic, though...

This just seems kind of high..

Maybe a series resistor isn't a good model, although, a constant series 
resistor would have increasing DF as frequency goes up, which IS somewhat 
realistic.

And, of course, what sort of model can we use for the CD "geekgroup" type caps?