It’s impossible to get the capacitance of a 220mm disc below 5pF regardless of how far away the 2nd plate is. Roughly speaking, self capacitance becomes dominant when the plates are further ...

Figure 3. (a) Schematics of the parallel plate capacitor tip-sample geometry with an insulating film and conducting both tip and the substrate. Image adapted from Ref. 2. (b) Schematics of the ...

For a parallel plate capacitor (with vacuum between the plates), where A is the area of each plate and d the separation between them. 2.13 EFFECT OF DIELECTRIC ON CAPACITANCE ...