HF Filter Design and Computer Simulation

3.2: Capacitance

3.2 Capacitance

An electric field is created when a potential difference is applied across conductors separated by an insulator (dielectric). Energy is stored in this electric field. The stored energy is

(3)

where C is the capacitance and E is the potential difference. The capacitor attempts to retain a stored charge and maintain a constant potential difference. The terminal impedance is

(4)

The impedance is purely reactive, negative, and inversely proportional to frequency.

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