- #1
CraigH
- 222
- 1
Homework Statement
Draw the equivalent circuit for a lumped capacitance with dielectric losses that would be appropriate at RF frequencies.
Homework Equations
Possibly
Xc=-j/ωC
The Attempt at a Solution
I do not really know what the question is asking. I know that a lumped capacitance is a capacitor with no parasitic elements, ie, no electrical resistance or inductance. It is just a pure capacitance.
As for dielectric losses, I guess this means that not all of the energy "used" by the capacitance is stored in the electric field created by it, some of this energy is lost due to ohmic heating caused by the electrons "leaking" through the dielectric (which has a resistance). I'm not sure if this is correct though.
My best guess for the answer to the question will be to draw a capacitor in parallel with a resistor.
The problem is that I feel that this contradicts the "lumped capacitance" part of the question. I also don't know why it was mentioned that this capacitor will be operated at RF frequencies. This question is from a revision sheet, so the actual answer doesn't matter as long as I know exactly what the question means, and I know how would answer similar types of questions in the exam, which is why I think the statement about it being at RF frequencies is important.
Please help!
Thank you