Abstract: An orthomode transducer and to a satellite transmission chain includes the orthomode transducer, for transmitting a first signal and a second signal in orthogonal propagation modes. The transducer comprises: a primary waveguide with a square or rectangular cross section, two guided access means having firstly a free end via which the first signal and the second signal are respectively injected or recovered, and secondly two arms connected to the primary waveguide. Each guided access means comprises a junction configured so as to connect the free end to the two arms of the guided access means, the two arms of each guided access means being connected to the primary waveguide at two off-centred locations on one or more sides of the primary waveguide symmetrically about an axis of symmetry of the primary waveguide.

Abstract: A compact radiofrequency driver includes at least one axial port intended to be connected to a radiating antenna, at least one output intended to collect received signals and at least one input intended to transmit signals, comprising first and second septum polarizers and a frequency filter, the second polarizer being connected, via its common port, to a first rectangular port of the first polarizer and the frequency filter being connected to the second rectangular port of the first polarizer and being configured to filter a reception or transmission frequency band, these two bands being different, and wherein at least one of the polarizers is configured to convert a circularly polarized signal received on said axial port of the driver into a linearly polarized signal in a reception frequency band and in that at least a second polarizer is configured to convert a linearly polarized signal transmitted to the driver by the input into a circularly polarized signal in a transmission frequency band.

Abstract: An orthomode transducer and to a satellite transmission chain includes the orthomode transducer, for transmitting a first signal and a second signal in orthogonal propagation modes. The transducer comprises: a primary waveguide with a square or rectangular cross section, two guided access means having firstly a free end via which the first signal and the second signal are respectively injected or recovered, and secondly two arms connected to the primary waveguide. Each guided access means comprises a junction configured so as to connect the free end to the two arms of the guided access means, the two arms of each guided access means being connected to the primary waveguide at two off-centred locations on one or more sides of the primary waveguide symmetrically about an axis of symmetry of the primary waveguide.

Abstract: A compact radiofrequency driver includes at least one axial port intended to be connected to a radiating antenna, at least one output intended to collect received signals and at least one input intended to transmit signals, comprising first and second septum polarizers and a frequency filter, the second polarizer being connected, via its common port, to a first rectangular port of the first polarizer and the frequency filter being connected to the second rectangular port of the first polarizer and being configured to filter a reception or transmission frequency band, these two bands being different, and wherein at least one of the polarizers is configured to convert a circularly polarized signal received on said axial port of the driver into a linearly polarized signal in a reception frequency band and in that at least a second polarizer is configured to convert a linearly polarized signal transmitted to the driver by the input into a circularly polarized signal in a transmission frequency band.

Abstract: A radiofrequency exciter comprises a junction including an axial access intended to be connected to a horn antenna, at least four lateral accesses and at least four frequency filters that are associated with the four lateral accesses, respectively, the junction including, in series, a first coupling cavity equipped with two coupling slots that are able to sample a vertical polarization, and a second coupling cavity equipped with two coupling slots that are able to sample a horizontal polarization, the four frequency filters being connected directly to the four respective coupling slots, the first coupling cavity having a transverse cross-section having a constant vertical dimension and a horizontal dimension that decreases between the axial access and a transverse exit aperture of the first coupling cavity.

Abstract: An orthogonal-mode junction coupler and an associated polarization and frequency separator, the junction coupler comprises three opening slots, referred to as coupling slots, which are made in the casing of the coupler and pass through a plane referred to as transverse with respect to the junction coupler. Two of the three coupling slots are aligned along a first axis referred to as transverse with respect to the junction coupler, the section of the two coupling slots being of the same dimensions and of the same orientation. The two coupling slots are configured to be coupled to one of the two orthogonal linear polarizations. The third coupling slot is situated on a second axis referred to as transverse with respect to the junction coupler, the second transverse axis being substantially orthogonal with respect to the first transverse axis.

Abstract: A radiofrequency exciter comprises a junction including an axial access intended to be connected to a horn antenna, at least four lateral accesses and at least four frequency filters that are associated with the four lateral accesses, respectively, the junction including, in series, a first coupling cavity equipped with two coupling slots that are able to sample a vertical polarization, and a second coupling cavity equipped with two coupling slots that are able to sample a horizontal polarization, the four frequency filters being connected directly to the four respective coupling slots, the first coupling cavity having a transverse cross-section having a constant vertical dimension and a horizontal dimension that decreases between the axial access and a transverse exit aperture of the first coupling cavity.

Abstract: The two twin-reflector antennas comprise a common support on which they are mounted, with each twin-reflector antenna comprising a main reflector, a secondary reflector and at least one radiating source placed in front of the corresponding secondary reflector, and optical paths of beams produced by the two twin-reflector antennas crisscrossing one another.

Abstract: An orthogonal-mode junction coupler and an associated polarization and frequency separator, the junction coupler comprises three opening slots, referred to as coupling slots, which are made in the casing of the coupler and pass through a plane referred to as transverse with respect to the junction coupler. Two of the three coupling slots are aligned along a first axis referred to as transverse with respect to the junction coupler, the section of the two coupling slots being of the same dimensions and of the same orientation. The two coupling slots are configured to be coupled to one of the two orthogonal linear polarizations. The third coupling slot is situated on a second axis referred to as transverse with respect to the junction coupler, the second transverse axis being substantially orthogonal with respect to the first transverse axis.

Abstract: The two twin-reflector antennas comprise a common support on which they are mounted, with each twin-reflector antenna comprising a main reflector, a secondary reflector and at least one radiating source placed in front of the corresponding secondary reflector, and the two twin-reflector antennas criss-crossing one another on the common support.