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A resonator is a circuit that responds to a narrow range of frequencies. A typical resonator is a tuned circuit containing an inductor and a capacitor in series or parallel. A series connected tuned circuit has zero impedance at the resonant frequency, while a parallel tuned circuit has infinite impedance at the resonant frequency.

The resonant frequency in both cases depends on the inductance times the capacitance:

F = 1 / (2.pi.sqrt(LC))

If the inductance is in Henrys and the capacitance in Farads, the answer is in Hz.

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