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: A device for sending and receiving electromagnetic waves comprises an antenna with a waveguide, a sending card and a receiving card. The sending card and the receiving card each extend essentially from the waveguide, and therefore from the antenna axis, in a plane perpendicular to this axis and between them form an angle greater than 90°.

Abstract: An RF signals amplification block receives a first RF signal (RFin), and comprises means of amplification (3, 4, 12, 15) of this first RF signal so as to deliver a second, amplified, RF signal (RF1). This signal (RF1) must be amplified by a predetermined nominal power (Pout) so as to be delivered at the output of the block.

Abstract: The invention proposes the use of a reel, for instance for a device for electromagnetic wave communication, comprising a first component movable in rotation in relation to a second component about an axis and at least one first cable fixed to the first component at at least one point. The first cable is fixed to the second component at at least one point and the first cable is wound spirally about the axis. The reel comprises at least one second cable wound spirally about the axis and separated from the first cable by a first flange perpendicular to the axis.

Abstract: The invention relates to a focusing device comprising a Luneberg lens comprising a homogeneous volume of dielectric. It is characterized in that the dielectric comprises a granular agglomerate defined by a homogeneous granule size distribution of thermoplastic granules, at least one plurality of these granules being welded together by granule boundaries in order to keep said volume consolidated. Particular application to lenses for the tracking of nongeostationary satellites, of at least one geostationary satellite, or for use in an MMDS system.

Abstract: The invention comprises a low-noise amplifier of the type comprising a transistor exhibiting a saturation phase for signals of high amplitude. According to the invention, at the output of the amplifier is arranged a load impedance referring back to this output an optimal impedance for maximizing the power at the output of the transistor and an open circuit in the reception frequency band. Thus, the entire parasitic signal is “boxed in” by the load impedance. Particular application in the field of bidirectional transmissions, especially transmission systems linking a terminal comprising the device according to the invention with at least one satellite or a terrestrial base station.

Abstract: A device for sending and receiving electromagnetic waves comprises an antenna with a waveguide, a sending card and a receiving card. The sending card and the receiving card each extend essentially from the waveguide, and therefore from the antenna axis, in a plane perpendicular to this axis and between them form an angle greater than 90°.

Abstract: The invention aims to minimize the analogue/digital converter over-dimensioning within the framework of reception of signals originating from a satellite and exhibiting power levels which can vary over time. The invention proposes a technique of automatic gain control which handles the setting of the noise level associated with the amplified signal. The automatic gain control is achieved by neutralizing the signal received by the antenna, and by adjusting the gain during the neutralization of the signal received until a predetermined noise level is obtained at the end of the reception facility. The invention also pertains to a device comprising the means for implementing the method.

Abstract: The invention relates to a device for emitting and/or receiving electromagnetic waves comprising a lens bringing a plurality of directions defined by the radiation space of the lens into correspondence with a plurality of focusing points defining a focusing surface of the lens, the lens comprising a shaped volume of dielectric material. According to the invention, the dielectric material comprises a granular agglomerate defined by a homogeneous or quasi-homogeneous distribution of granules of the same type and of small size with respect to the wavelength (&lgr;R, &lgr;T) of the electromagnetic waves to be received and/or emitted by the said device, the said granules being held under pressure in the said volume by holding means shaped according to the said volume. The invention also relates to a communications terminal comprising a device according to the invention.

Abstract: The invention relates to a system of antennas for tracking nonsynchronous satellites (21, 22) along predefined trajectories. It is characterized in that the said system includes at least first (11) and second (12) transmitter/receiver elements moving in the vicinity of the focusing surface of the system (1) along a line of focal points, the first element (11) actively tracking a first satellite (21) and the second element (12) standing by to actively track a second satellite (22). Particular application to the tracking of nonsynchronous satellites, in particular low- and mid-orbit satellites, and of geostationary satellites.

Abstract: The present invention relates to a source-antenna for transmitting/receiving electromagnetic waves comprising an array of n radiating elements (113, 114) operating in a first frequency band, means (20) with longitudinal radiation operating in a second frequency band, the array and the means with longitudinal radiation having a substantially common phase centre, the n radiating elements being arranged symmetrically about the longitudinal-radiation means, and each element (113, 114) of the array consisting of a radiating element of the travelling wave type.

Abstract: The invention provides a simple solution for a broadband transmitter/receiver for which the working bandwidth is split into at least two non-contiguous sub-bands. The invention uses a filtering means 50 which comprises at least two band-pass filters 51 and 52 provided with switching means 53 and 54. The use of two switched filters 51 and 52 makes it possible to use a single synthesizer 6 to scan two sub-bands of the working bandwidth. The frequency synthesizer 6 operates for one sub-band in supradyne mode and for the other sub-band in infradyne mode. In a variant, the invention uses a third filter and divides the bandwidth into three sub-bands.

Abstract: The invention relates to a device for transmission and/or reception of signals. It comprises a first waveguide (9) for the reception/transmission of signals and a second waveguide (23) for the transmission of a signal originating from an oscillator of the reception board, for example, to the transmission board. Particular application to the field of broadcasting signals exchanged between a station and a dwelling, in the scope of the MMDS, LMDS or MVDS, or between a satellite and a dwelling, in the scope of a satellite telecommunications system.

Abstract: The invention relates to a device for emitting and/or receiving electromagnetic waves comprising a lens bringing a plurality of directions defined by the radiation space of the lens into correspondence with a plurality of focusing points defining a focusing surface of the lens, the lens comprising a shaped volume of dielectric material.

Abstract: A device includes a waveguide for the transmission/reception of microwave signals. The waveguide is coupled to a microstrip reception circuit as well as to a microstrip transmission circuit. The waveguide includes a filter arrangement which attenuates the microwave signals transmitted from the transmission circuit in order to prevent undesirable interference to the reception circuit.