[AR] comsats and bandwidth (was Re: Future Exploration Policy...)
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Sat, 10 Feb 2018 20:42:07 -0500 (EST)
On Sat, 10 Feb 2018, Uwe Klein wrote:
Haven't really looked into what kind of beamwidth you can reasonably
achieve with a phased array antenna.
Much the same story as a non-phased-array antenna, given densely packed
elements and good control: angular beam width (in radians) is, to zeroth
order, wavelength/diameter. (To go from zeroth to first order, multiply
that by a small constant, whose exact value depends on how you define
where the beam edge is.)
though I think you'd go another way. create an array of SDR transmitters
and synthesize their input from multiple sources ( to form a multi beam,
multi content radiation pattern. )
There are phased-array systems which already do multi-beam transmission,
e.g. the "multiple access" system on the original TDRS satellites.
Henry
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- » [AR] comsats and bandwidth (was Re: Future Exploration Policy...) - Henry Spencer