Abstract: For a simultaneous dual-band reception or transmission of video signals and data in a domestic environment, a terminal in a communication system is made up of a front end module connected to digital processing circuits via a circuit designed for MIMO techniques. At least two antennas linked to the terminal are broadband and dual-access, each of the accesses corresponding to a path for receiving or transmitting signals in a first or a second frequency band. The front end module comprises first switches connected to the paths for receiving or transmitting signals in the first frequency band, and second switches connected to the paths for receiving or transmitting signals in the second frequency band. It also comprises selective high-pass filters in the paths for receiving or transmitting signals in the highest frequency band.

Abstract: The invention relates to a microwave filter comprising a coaxial structure, consisting of a tubular outer conductor and an inner bar conductor. According to the invention, the inner bar conductor extends in an axial direction inside the outer tube and, together with said tube, forms a series of concentric slots in the axial direction thereby defining successive coaxial line segments with low characteristic impedance and coaxial line segments with high characteristic impedance. The aforementioned concentric slots are produced in a synthetic foam block.

Abstract: The invention relates to RF bandpass filters with pseudo-elliptic response. In a filter comprising a dielectric substrate placed in E position in a rectangular waveguide and comprising inserts on one of the surfaces of the substrate are placed conductors linked electrically to the walls of the guide, and on the other surface of the substrate opposite these conducting inserts are placed electrically floating inserts that make it possible to determine zeros in the transmission curve of the filter. This yields a filter exhibiting a response curve of pseudo-elliptic type which improves the rejection of spurious frequencies without increasing the dimensions of the filter.

Abstract: The present invention relates to a wideband antenna with omni-directional radiation comprising two conductive arms placed on a substrate one of the two arms, called second arm, is supplied by a shielded line by using the other arm, called first arm.

Abstract: The invention proposes an optimized solution of a frequency/polarization splifter that requires no adjustment after production and can be produced entirely by moulding. The polarized-wave splitter comprises various components, including a polarization splitter 1 coupled to two filters 3 and 5 via transition regions 2 and 4. The overall dimensions of the various components are such that the transfer characteristics of the splitter are better than the characteristics resulting from the sum of the characteristics of the components constituting the splitter.

Abstract: The invention proposes an upgradable product capable of covering two sub-bands. An outdoor unit comprises, on the uplink, a switchable oscillator coupled to a waveguide featuring a removable cover enabling the said waveguide to be converted into a band rejector filter.

Abstract: The module comprises an input/output access point at a first end of a waveguide with a square cross section, called a square waveguide, two access points made of waveguides with a rectangular cross section, called rectangular waveguides, placed side by side at a second end of the square waveguide and a septum positioned in the square waveguide at the end of a separation region common to the two rectangular waveguides in order to allow the production of two circular polarizations of opposite handedness each associated with a rectangular waveguide. The module is arranged so as to form a diplexer in which the septum is included and where the access points by rectangular waveguide are extended by filters, each access point being endowed with a filter provided in order to transmit a frequency band which is different. The steps of the septum are dimensioned so as to compensate for reflections.

Abstract: The invention proposes an optimized solution of a frequency/polarization splifter that requires no adjustment after production and can be produced entirely by moulding. The polarized-wave splitter comprises various components, including a polarization splitter 1 coupled to two filters 3 and 5 via transition regions 2 and 4. The overall dimensions of the various components are such that the transfer characteristics of the splitter are better than the characteristics resulting from the sum of the characteristics of the components constituting the splitter.

Abstract: The high frequency, multiple beam antenna system comprises a focusing device having a profile of revolution created by the cross section of a dielectric lens rotating about an axis located in its plane and radiating elements with form of directional-printed antennas with longitudinal radiation.

Abstract: The network antenna of the RLSA type in the form of a radial waveguide has a feed structure allowing simultaneous excitation of the antenna in two orthogonal linear polarizations. The feed structure, essentially placed to the rear of the antenna, consists of a circular waveguide placed at the centre of the radial waveguide and coupled to the latter by two circular slots for the excitation of the antenna in a first linear polarization and of a coaxial waveguide surrounding the circular waveguide and coupled to the radial waveguide by radial slots, the coaxial waveguide being excited by a ring-shaped waveguide placed coaxially on the outer periphery of the coaxial waveguide and coupled to the latter by slots distributed around the inner periphery of the ring for the excitation of the antenna in a second linear polarization orthogonal to the first linear polarization.

Abstract: The invention proposes a primary feed providing an asymmetrical illumination compatible with an elliptical reflector and having a small space requirement. The invention uses a short rod to modify the radiation of an open waveguide section. The invention is an antenna comprising a radiating feed made up of a waveguide, one end of the waveguide forming a radiating aperture. The end forming the radiating aperture is fitted with a rod made of dielectric material, said rod being partly inserted in the waveguide. The rod is extended outside the waveguide over a length less than twice the guided wavelength and the section of the rod develops outside the waveguide differently in each of the planes.

Abstract: The invention relates to a microwave filter comprising a coaxial structure, consisting of a tubular outer conductor and an inner bar conductor. According to the invention, the inner bar conductor extends in an axial direction inside the outer tube and, together with said tube, forms a series of concentric slots in the axial direction thereby defining successive coaxial line segments with low characteristic impedance and coaxial line segments with high characteristic impedance. The aforementioned concentric slots are produced in a synthetic foam block.

Abstract: A floating microwave filter in a waveguide structure comprises filtering elements sandwiched between two foam half-bars that are placed inside a waveguide. The filtering elements are metal features etched in the surface of one of the two foam half-bars and the waveguide is an internally hollowed-out block of foam having a metallized external surface.

Abstract: The invention proposes a radio wave emission block intended to modify a satellite-based reception installation into a cheaper emission/reception installation. The emission block comprises a first input/output terminal and a second input/output terminal electrically linked to the first input/output terminal by way of a band rejection filter which rejects the intermediate emission frequency band. The invention also pertains to a tranmission device comprising a reception block coupled with the emission block.

Abstract: The invention relates to RF bandpass filters with pseudo-elliptic response. In a filter comprising a dielectric substrate placed in E position in a rectangular waveguide and comprising inserts on one of the surfaces of the substrate are placed conductors linked electrically to the walls of the guide, and on the other surface of the substrate opposite these conducting inserts are placed electrically floating inserts that make it possible to determine zeros in the transmission curve of the filter. This yields a filter exhibiting a response curve of pseudo-elliptic type which improves the rejection of spurious frequencies without increasing the dimensions of the filter.

Abstract: The network antenna of the RLSA type in the form of a radial waveguide has a feed structure allowing simultaneous excitation of the antenna in two orthogonal linear polarizations. The feed structure, essentially placed to the rear of the antenna, consists of a circular waveguide placed at the centre of the radial waveguide and coupled to the latter by two circular slots for the excitation of the antenna in a first linear polarization and of a coaxial waveguide surrounding the circular waveguide and coupled to the radial waveguide by radial slots, the coaxial waveguide being excited by a ring-shaped waveguide placed coaxially on the outer periphery of the coaxial waveguide and coupled to the latter by slots distributed around the inner periphery of the ring for the excitation of the antenna in a second linear polarization orthogonal to the first linear polarization.

Abstract: The present invention relates to a method for producing an antenna comprising a conductive wire, formed by a wire, made of a conductive material, whose path has a helical shape. In accordance with the invention, such a method is characterised in that a print is formed in relief on one side of an element of an electrically insulating material such that the helical shape is generated by depositing the conductive material in this print.

Abstract: The high frequency, multiple beam antenna system comprises a focusing device having a profile of revolution created by the cross section of a dielectric lens rotating about an axis located in its plane and radiating elements with form of directional-printed antennas with longitudinal radiation.

Abstract: The invention relates to a source antenna constituted by a radiating aperture comprising at least one insert made of a dielectric material mounted floating inside the aperture.

Abstract: The module comprises an input/output access point at a first end of a waveguide with a square cross section, called a square waveguide, two access points made of waveguides with a rectangular cross section, called rectangular waveguides, placed side by side at a second end of the square waveguide and a septum positioned in the square waveguide at the end of a separation region common to the two rectangular waveguides in order to allow the production of two circular polarizations of opposite handedness each associated with a rectangular waveguide. The module is arranged so as to form a diplexer in which the septum is included and where the access points by rectangular waveguide are extended by filters, each access point being endowed with a filter provided in order to transmit a frequency band which is different. The steps of the septum are dimensioned so as to compensate for reflections.