Device for rotating the polarization of an electromagnetic wave at the exit from a waveguide, and a corresponding system

A device for rotating through a predefined angle the polarization of a polarized electro-magnetic wave propagating in a first waveguide, said device being characterized in that it comprises a second waveguide having a lateral port, said polarized electro-magnetic wave propagates between a port of said first waveguide and said lateral port of said second waveguide via a coupling orifice that is smaller than the cross-section of said first waveguide and whose geometry is adapted to provide electro-magnetic coupling between said first waveguide and said second waveguide, and the other port of said second waveguide is on a face perpendicular to said lateral port,

• wherein said first waveguide is a rectangular waveguide type microwave filter including a plurality of successive cavities and said coupling orifice opens directly into an end cavity of said first waveguide.

A device for rotating through a predefined angle the polarization of a polarized electro-magnetic wave propagating in a first waveguide, said device being characterized in that it comprises a second waveguide having a lateral port, said polarized electro-magnetic wave propagates between a port of said first waveguide and said lateral port of said second waveguide via a coupling orifice that is smaller than the cross-section of said first waveguide and whose geometry is adapted to provide electro-magnetic coupling between said first waveguide and said second waveguide, and the other port of said second waveguide is on a face perpendicular to said lateral port,

• wherein said second waveguide is also a rectangular waveguide type microwave filter including a plurality of successive cavities and said coupling orifice opens directly into an end cavity of said second waveguide.