Antenna beamwidth calculatorEnter the diameter of your parabolic dish in m (metres) and the operating frequency in GHz (Gigahertz) A typical VSAT is 1.2m diameter and transmits at 14  14.5 GHz The calculation results are:
The results are increasingly approximate beyond the 3 dB contour. The first null may appear at an angle off the boresight similar the the 3 dB full beamwidth. Default values: 

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Eric Johnston This calculator is copyright © 2007 Satellite Signals Ltd Original : 10 Oct 2007. Amended 9 April 2012 to include the possibility of altering the efficiency, in the range 0.6 to 0.8 Page last updated 10 Oct July 2014 