Antenna Length Calculator
Calculate the physical length of dipole and quarter-wave antennas for a given frequency.
MHz
Half-Wave Dipole
34.62 cm
Full Wavelength0.6924 m
Quarter-Wave Monopole17.31 cm
Half-Wave Dipole vs Frequency
Antenna Length
Formulas
Wavelength = c / f = 299.792 / f(MHz) meters
Half-wave dipole = wavelength / 2
Quarter-wave monopole = wavelength / 4
In practice, antennas are shortened 2-5% due to end effects and conductor diameter.
Example Calculation
Design an antenna for 433 MHz ISM band.
- 01Wavelength = 299.792 / 433 = 0.6924 m
- 02Half-wave dipole = 0.6924 / 2 = 34.62 cm
- 03Quarter-wave = 0.6924 / 4 = 17.31 cm
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