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Your question seems to answer itself in some respects: '...a power transmission of 13.1dBW (20 watts)...' But an antenna doesn't really draw power, it gets fed power (energy) from a source and radiates it into space. I think the question you really are asking is: "How much power will my amplifier need to power my 20 $W_{RF}$ communications system?" ...


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https://en.wikipedia.org/wiki/Beam_waveguide_antenna The wiki article is short but I think it answers the question. Non-"beam waveguide" antennas don't allow use of different receivers simultaneously. For example DSN 70-meter dishes can't receive Ka-band, but only X-band. They would require long operation of receiver change. Also receivers and ...


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