# Frequency and Wavelength Calculation

## Frequency Wavelength Calculator

Frequency (f): | MHz |

Frequency Wavelength: | m |

Electromagnetic (EM) waves travel through space (a vacuum or free space) at the speed of light at approx. 2.99792 x 10^8 m/s. The speed of light is often rounded up for ease of calculation to 3.00 x 10^8 m/s.

The wavelength of an electromagnetic wave decreases with frequency.

- 100Hz has a wavelength of 3000km
- 1kHz has a wavelength of 300km
- 1MHz has a wavelength of 300m
- 1GHz has a wavelength of 300mm
- 1THz has a wavelength of just 0.300mm or 300um

## Wavelength Formula

The formula for calculating the wavelength lambda **λ** ( in meters) with the frequency **f** (in hertz) and the velocity **v** of the speed of light (in meters per second):

λ = v / f

λ = 2.99792 x 10^8 / f

## Example Wavelength Calculation

3.00x 10^8/100MHz = 3m

*Now as you can see that if you want to receive an RF signal at 100MHz you would need quite a large antenna (3m) so we can use a 1/2 or 1/4 wavelengths of the calculated value on a dipole antenna.*

## VSAT Frequency Bands Wavelength

**C band**uplink ( ≈ 6Hz) has a wavelength of about 50mm and the C band downlink for satellite ( ≈ 4GHz) is about 75mm.**Ku band**uplink ( ≈ 14GHz ) has a wavelength of about 21.5mm and the downlink ( ≈ 11GHz) of about 27.3mm.

Tag:calculator, frequency, rf, wavelength