Frequency & Wavelength
Enter frequency, wavelength or period and get the others, in vacuum or in a medium with its velocity factor (coax, fiber). The basis for antennas, cables and RF.
All quantities
| Quantity | Value | Formula |
|---|
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How it is computed · f, λ, T and antennas
1. In vacuum waves travel at
c = 299,792,458 m/s. In a medium the speed drops:
v = VF · c, where VF is the velocity factor
(coax ≈ 0.66–0.85; fiber ≈ 0.68 from n ≈ 1.47).
2. Frequency and wavelength are inverse:
λ = v / f and f = v / λ. The period is
T = 1 / f.
3. For antennas: λ/4 (a quarter
wave) gives the length of a monopole or a stub; λ/2 is a
dipole. Use the λ of the element's medium (with its VF).
4. Example: 2.4 GHz in vacuum →
λ = 3·10⁸ / 2.4·10⁹ ≈ 12.49 cm, T ≈ 0.417 ns and
λ/4 ≈ 3.12 cm.
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