Frequency and Wavelength Calculation

Frequency Wavelength Calculator

Frequency (f): MHz

Frequency Wavelength: m

Calculating the wavelength in meters
Wavelength Calculation Formula

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.

 

 

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