There is disclosed in one example an electromagnetic wave launcher apparatus, including: an interface to an electromagnetic waveguide; a first launcher configured to launch a high-frequency electromagnetic signal onto a first cross-sectional portion of the waveguide; and a second launcher configured to launch a lower-frequency electromagnetic signal onto a second cross-sectional portion of the waveguide.

A multi-band orthomode transducer device comprises a three-dimensional housing. The three-dimensional housing encompasses at least two orthomode transducers, each orthomode transducer being assigned to three ports of which a first port relates to a first polarization, a second port relates to a second polarization and a third port relates to a combination of the first and second polarizations. Each of the orthomode transducers has a waveguide connected with the three ports. The waveguides of the orthomode transducers are located in the three-dimensional housing without intersecting each other.

An orthomode junction for separating and/or combining orthogonally-polarized radiofrequency wave signals, comprises a body which has a main cavity forming a main waveguide, which has a blind end, and auxiliary cavities forming auxiliary waveguides, which communicate laterally with the main cavity in the vicinity of the blind end thereof, and a deflection insert situated at the blind end of the main cavity and facing the auxiliary cavities, the deflection insert having different shapes on the side of the auxiliary cavities respectively.

Disclosed is a shaped horn in conjunction with a dielectric tube for enhanced aperture directivity that can achieve a near optimum efficiency. The shaped horn provides additional mode control to provide an improved off-axis cross-polarization response. The horn shape can be individually optimized for isolated horns or for horns in a feed array. The feed array environment can produce results that lead to a different optimized shape than the isolated horn. Lower off axis cross-polarization can result in improved efficiency and susceptibility to interference.

An antenna device includes a beamforming circuit (3) that forms a radio wave in a first frequency band, including two polarized waves orthogonal to each other, and outputs the radio wave in the first frequency band, a beamforming circuit (6) that receives the radio wave in the first frequency band output from the beamforming circuit (3), and outputs a the radio wave in the first frequency band, and forms a radio wave in a second frequency band, including two polarized waves orthogonal to each other, and outputs the radio wave in the second frequency band, and primary radiators (7) that emit a beam in the first frequency band in response to the radio wave in the first frequency band output from the beamforming circuit (6), and emit a beam in the second frequency band in response to the radio wave in the second frequency band output from the beamforming circuit (6).

Provided is a dual-band multimode antenna feed for a high-frequency band and a low-frequency band. The feed includes four high-frequency waveguide ports, where each high-frequency waveguide port is connected to a respective high-frequency input/output waveguide. Each high-frequency input/output waveguide includes a high-frequency waveguide aperture facing a first section for mixing electromagnetic modes in the E-plane. The first section is connected to a second section for mixing electromagnetic modes in the H-plane. The feed further includes a low-frequency waveguide port connected to a low-frequency input/output waveguide. A filter is arranged inside the first section to be transparent for plane wave modes exhibited at lower frequencies and reflecting for plane wave modes exhibited at higher frequencies.

An antenna device includes a beamforming circuit (3) that forms a radio wave in a first frequency band, including two polarized waves orthogonal to each other, and outputs the radio wave in the first frequency band, a beamforming circuit (6) that receives the radio wave in the first frequency band output from the beamforming circuit (3), and outputs a the radio wave in the first frequency band, and forms a radio wave in a second frequency band, including two polarized waves orthogonal to each other, and outputs the radio wave in the second frequency band, and primary radiators (7) that emit a beam in the first frequency band in response to the radio wave in the first frequency band output from the beamforming circuit (6), and emit a beam in the second frequency band in response to the radio wave in the second frequency band output from the beamforming circuit (6).

An excitation assembly comprises a symmetrical OMT and two splitters respectively connected to two pathways of the OMT. The OMT comprises a cross junction comprising a central waveguide parallel to an axis Z and four lateral ports oriented in two directions X, Y, the first splitter consisting of an input waveguide and of two output ports coupled to two lateral ports, oriented in the direction X, by respective connection waveguides. The first splitter is located on a lateral side of the OMT, orthogonally to the direction X, and its two output ports are formed one above the other in a lateral wall of the input waveguide, the upper output port being placed facing a first lateral port of the OMT to which it is connected by the first connection waveguide. The difference in electrical length between the two connection waveguides is equal to /2.

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.

Antenna arrays comprising planar combiner networks. An apparatus includes a first antenna component comprising a first multiplexer and a second antenna component comprising a second multiplexer. The apparatus is such that the first antenna component is located next to the second antenna component within an antenna array and the apparatus is disposed within a lattice spacing of the antenna array.