I am trying to calculate a two-fingered, both on the same layer, capacitor. I have run into a few papers on it but they are taking a ground plane on the other side of the PCB into consideration and they seem to be showing a meandered capacitor like this one
I know that the capacitance formula is where A = t * L; t being the thickness of the copper pour and L being the length on which the two traces juxtapose, thus forming the plates of our capacitor. Should I apply it as such (no ground plane beneath) ? Am I also right to be using these values ?
- epsilon_r = 1 for air
- t = 35 microns for 1 oz copper