I'm trying to find the capacitive load repreented by an RC first order highpass filter.
Intuitively, I tend to believe the load will not be the C series capacitance, since the capacitor is not being charged and discharged in every cycle. It is loaded to a constant value and stays there.
I did a simple simulation with 3 different RC filters, each with different capacitances.
As expected, after different time constants, the voltages all result in the same waveform, the input square wave with DC removed
Its the same story with current: all converge to the same waveform
Per this waveforms I conclude my reasoning is correct: after transient is extinguished, the RC filters present exactly the same load, which is just resistive. So the RC filter presents 0 capacitive load in permanent state?
If this is correct, I would like a theoretical justification, which I can not make.