POLARISATION DEVICE FOR A SATELLITE TELECOMMUNICATIONS ANTENNA AND ASSOCIATED ANTENNA

The present invention relates to a polarization device (10) for a satellite telecommunications antenna (11) including at least one frequency selective layer (12) able to convert a linear polarization (E), including two components (Ex, Ey), into left circular polarization in a first transmission frequency band (Tx) and into right circular polarization in a second receiving frequency band (Rx) or vice versa, the phase shift between the two components (Ex, Ey) of the linear polarization (E) being included between −85 and −95 degrees, preferably −90 degrees in one of the frequency bands (Rx, Tx), and the phase shift between the two components (Ex, Ey) of the linear polarization (E) being included between +85 and +95 degrees, preferably +90 degrees in the other frequency band (Rx, Tx).