Requirements of antennas for satellite communication
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satellite antenna with a circular spot beam of diameter 1° , the gain is 27,000 or 44.3 dB. For a Ku-band downlink at 12 GHz, the required antenna diameter determined from either the gain or the half power beamwidth is 1.75 m. ... Thus, the required gain is 89.2 or 19.5 dB.
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