A dual circular polarization feed antenna system for
satellite communication is described. It consists of a septum
OMT-Polarizer type, and two identical duplexers formed by a
plane T-junction and of two iris filters, along with two electric
field rotators since the vectors of the electric field in the
rectangular ports must be vertical. This 4-port system transmits
and receives radio frequency signals in double track in which
the transmission Tx is made through two ports having as a
access the standard rectangular waveguide WR42 and the
reception RX is made also through two ports having as a access
the standard rectangular waveguide WR28. To separate the two
ways with the circular common port (or rather on the level of
the antenna), as well in the transmission as in the reception, we
used double circular polarization: right hand circular
polarization (RHCP) and left hand circular polarization
(LHCP)
