Fig. 4. Formulas related to capacitive coupling. (A) Impedance of a capacitor equation. Zc, impedance of a capacitor; f, frequency of the signal; C, capacitance of the capacitor. (B) Coaxial cylindrical capacitor and its capacitive coupling formula. C, capacitance; a, radius of the inner cylinder; b, radius of the outer cylinder; L, length of the cylinder; k, dielectric constant; ε0, permittivity of vacuum.
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