Coil, capacitor, resonance
Resonant frequency from coil and capacitor, or the missing capacitance or inductance for the frequency you want.
Coil, capacitor, resonance
Enter two values and the third is worked out. It always calculates the field you haven't touched for the longest.
How the page calculates
- f = 1 / (2ฯ ยท โ(L ยท C))
- X = 2ฯ ยท f ยท L
- Characteristic impedance of the circuit = โ(L / C)
The order decides which value is calculated: the field that hasn't been touched for the longest. At resonance, coil and capacitor have the same reactance with opposite sign, so they cancel out.
Related terms
- Magnetic loop
- small, narrow-band loop antenna, often for cramped locations
- Antenna tuner
- matches the impedance, but doesn't turn a bad antenna into a good one