LC tank coupling coefficient, for capacitive coupling

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Eugen_E

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An L1C1 tank is capacitively coupled to a second L2C2 tank using a capacitor C.

What is the formula for the coupling coefficient k for capacitive coupling?

I know that if k*(SQRT(Q1*Q2))=1, the circuits are critically coupled, but I don't know the formula for k for capacitive coupling.
 

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