Parallel Interdigital Capacitor : Physics involved in the problem.

Reply Tue 29 Apr, 2014 11:53 am
Hello world,
I have a particular problem, I need to resolve the Parallel Interdigital Capacitor Equation's, specifically I have two plates with five fingers each one, one plate is fix and the other one is movil, so How I can calculate the overlapping capacitance? (Note: Is important to consider the edge effects because the geometric characteristics are very small - micrometer order) How I can calculate the displacement capacitance?

The scheme is Similar to the patent http://www.google.com.lb/patents/US20100039193

My general idea is

CTotalOverlaping= Cideal* + Cedges** +CAdjacentFingers

*Cideal=Permitivity*AreaFinger/Distance between plates --> (Ideal Capacitance - Uniform Electric Field)

What about the fringe capacitance? What about the adjacent fingers?

But I don't know how follow, I'm really lost

Any Ideal?????


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