**Antenna beamwidth calculator**
Enter 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 total side to side beamwidth of the antenna main beam.
- Half the side to side beamwidth, if you are concerned to determine the
offset angle from the beam centre.
- Antenna gain. dBi means relative to an isotropic omni-directional antenna.
- The antenna gain shown in top line of the results is the on-axis gain.
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:
Maximum main beam gain calculation assumes an efficiency of 0.65
The shape of the main beam assumes parabolic illumination with level at dish edge
= -10 dB down.
Any problems or comments, please e-mail me
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 |