ToolsElectronics, cables & data
Radio frequency ↔ wavelength
Convert radio frequencies to wavelength, with half- and quarter-wave antenna lengths.
kHz
MHz
GHz
m
cm
Half-wave antenna (λ/2)
24.983cm
Quarter-wave antenna (λ/4)
12.491cm
Period
1.6667ns
Radio waves travel at the speed of light (299,792,458 m/s), not the speed of sound. Antenna lengths are free-space values; real antennas are a few percent shorter. Wireless microphones typically use UHF around 470 to 700 MHz or 2.4 GHz.
How it works
Electromagnetic waves travel about a million times faster than sound, so a 600 MHz wireless-microphone carrier has a wavelength of about 50 cm. Antenna lengths follow from the wavelength.
Formulas
- λ = c₀ / f, c₀ = 299,792,458 m/s
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