SATCOM tools
Antenna gain & G/T calculator.
Estimate gain, beamwidth and G/T for any antenna size and band, and compare common sizes side by side.
Reading the results
What each number means.
Antenna gain
How strongly the antenna focuses energy compared with an isotropic antenna, in dBi. Gain rises with antenna size and frequency: doubling the diameter adds about 6 dB.
G/T
The receive figure of merit: gain minus system noise temperature, in dB/K. It is the number satellite operators use to qualify a receive earth station.
Beamwidth
The angle across the main beam at half power. Narrow beams reject interference from adjacent satellites, but they need accurate pointing and a tracking-capable mount or controller at large sizes.
Need to point it? Use the satellite look angle calculator. Large antennas may also need antenna control and tracking systems.
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Sizing an antenna for your link?
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