LC resonant frequency calculator
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LC tank values
Resonant frequency
Resonant frequency (f)
f = 1 / (2π√(LC))
Inductor reactance (Xl)
Xl = 2πfL
Capacitor reactance (Xc)
Xc = 1 / (2πfC)
At resonance the two reactances are equal (here 100 Ω) — a quick sanity check on the result.
About the model
A capacitor and inductor wired in parallel or series form a resonant tank. At the resonant frequency the inductive and capacitive reactances cancel (Xl = Xc), so the tank either passes or blocks that frequency: series resonance is a low impedance, parallel resonance a high one. The frequency is set entirely by f = 1/(2π√(LC)).
Real parts add losses — the coil's series resistance and the capacitor's ESR damp the resonance and shift it slightly. For the parts themselves: RF inductors and capacitors in our catalog carry the ratings you need.
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