Satellite 3dB, 20, 40 and 60 dB bandwidth offset

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Hi all,
I would like to calculate the Satellite 3dB, 20, 40 and 60 dB bandwidth offset
Given the Tx/ Rx frequencies, the antenna diameter without curve
Can you help
Thanks
 

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I have a feeling that you refer to beamwidth and not bandwidth of the antenna.
However, beamwidths of parabolic antennas below -10dB are not accuarate.

Antenna beam width calculator

Input: dish diameter and frequency, output antenna beamwidth and gain
www.satsig.net
 

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