[AMPS] Capacitors & Resonance

[G0MJW]

> Mike, please explain a capacitor resonating in terms of its intrinsic
> inductance and capacitance at a frequency, but with shocking dielectric
> properties, with reference to your statement "it will look like a short
> circuit and be a very effective RF bypass."
> Surely, even though the cap is resonant, it will blow the lid off due to
> dielectric heating?

It will indeed. It does need to have an appropriate dielectric.

>
> >
> > It might seem that a 30pF 10kV doorknob capacitor resonant at 200 MHz
would
> > be a good anode bypass capacitor at 150MHz, only 10 ohms reactance at a
> > point with several kohms impedence.
>
> Passing 1 kW through this reactance sounds like a lot of I^2.R heat,
> which the capacitor has to dissipate?

Why ? I think these capacitors have a very low loss factor?




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