They both have separate feeds. The folks doing OSCAR feed the two antennas with splitters and phasing lines to feed the same signal to both antennas. To achieve the phase shift some use the antennas in the same plane and feed them out of phase with phasing lines. Another approach is to feed them in phase but shift one antenna forward or back. Either way produces circular polarization. But the key part of the OSCAR operation is the same signal goes to both antennas.
Obviously with the MIMO stuff it's independent signals to each antenna. Greg On Nov 4, 2011, at 10:45 AM, Fred Goldstein wrote: > No. The OSCAR circular-polarized antennas had a feed split between the V and > H antennas, which each had a driven element. The MIMO ones have independent > feeds.
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