Abstract: A method for suppressing interference signals generated between satellite access stations of a multi-spot communication system is implemented by a distributed on-board and ground subsystem which comprises, on board a multi-spot communication payload, one or more opposition matrices, switches of an input switch assembly connected to the output of the reception sources of the reception antenna, and switches of an output selection ring connected upstream of the transmission sources of the transmission antenna, and, on the ground, a satellite access station GWt having a communication spectrum monitoring system CSM and a computer. The suppression method comprises a set of steps for testing the satellite accesses of the different stations GW, enabling each opposition matrix to be set selectively. The multi-spot space communication system incorporating the subsystem for suppressing the interference signals is described.

Abstract: A method for suppressing interference signals generated between satellite access stations of a multi-spot communication system is implemented by a distributed on-board and ground subsystem which comprises, on board a multi-spot communication payload, one or more opposition matrices, switches of an input switch assembly connected to the output of the reception sources of the reception antenna, and switches of an output selection ring connected upstream of the transmission sources of the transmission antenna, and, on the ground, a satellite access station GWt having a communication spectrum monitoring system CSM and a computer. The suppression method comprises a set of steps for testing the satellite accesses of the different stations GW, enabling each opposition matrix to be set selectively. The multi-spot space communication system incorporating the subsystem for suppressing the interference signals is described.

Abstract: A method for calibrating a radiofrequency multichannel subsystem of a telecommunications payload includes a step of generating and injecting a calibration signal at one or more input access channel injection points; a step of tapping off the injected and propagated calibration signal at tapping-off points of an access channel at output; and then a step of estimating the amplitude and/or phase differences between the internal channels of the multichannel subsystem on the basis of the calibration signal injected at input, serving as a reference, and of the extracted calibration signal or signals; and then a step of correcting the amplitude and/or phase differences by way of correction means. The injected calibration signal is a chirp signal, formed of a chirp or of a sequence of at least two identical chirps. A calibration system implements the calibration method.

Abstract: A method for calibrating a radiofrequency multichannel subsystem of a telecommunications payload includes a step of generating and injecting a calibration signal at one or more input access channel injection points; a step of tapping off the injected and propagated calibration signal at tapping-off points of an access channel at output; and then a step of estimating the amplitude and/or phase differences between the internal channels of the multichannel subsystem on the basis of the calibration signal injected at input, serving as a reference, and of the extracted calibration signal or signals; and then a step of correcting the amplitude and/or phase differences by way of correction means. The injected calibration signal is a chirp signal, formed of a chirp or of a sequence of at least two identical chirps. A calibration system implements the calibration method.

Abstract: An envelope (100) detector for detecting a modulation envelope of a modulated signal. The envelope detector includes a sensor (102). The sensor has a sensor input (1021), for sensing a signal forming a measure for the amount of electrical power presented at the sensor input (1021). The sensor input (1021) is electrically conducting connectable to an electrical path (14), along which electrical path (14) the modulated signal is transmitted. The detector (100) includes a filter (103) for removing from the sensed signal a part contributed to non-envelope signal components in the modulated signal; and a detector output (104) connected to the filter (103) for outputting an envelope signal.

Abstract: A radio frequency device comprises a radio frequency (RF) power amplifier (PA) operably coupled to a protection circuit for minimising voltage standing wave ratio effects, wherein the protection circuit comprises a current limiter indexed to a power supplied to the RF PA. In this manner, the protection circuit combines detection of both current and voltage increase in order to provide a direct feedback on the final RF PA stage via a bias control.

Abstract: A radio frequency device comprises a radio frequency (RF) power amplifier (PA) operably coupled to a protection circuit for minimising voltage standing wave ratio effects, wherein the protection circuit comprises a current limiter indexed to a power supplied to the RF PA. In this manner, the protection circuit combines detection of both current and voltage increase in order to provide a direct feedback on the final RF PA stage via a bias control.

Abstract: The invention proposes an H-plane filter with inductive irises which exhibits a quasi-elliptic response while retaining the same compactness as a filter having a Chebyshev response. The invention furthermore makes it possible to use a large number of transmission zeros. For this purpose, there is proposed a waveguide filter comprising at least one cavity delimited by at least two inductive irises. The filter furthermore comprises at least one floating insert 1 placed in one of the inductive irises. The invention is also a process for manufacturing the waveguide filter incorporating at least one insert.

Abstract: The invention proposes an H-plane filter with inductive irises which exhibits a quasi-elliptic response while retaining the same compactness as a filter having a Chebyshev response. The invention furthermore makes it possible to use a large number of transmission zeros. For this purpose, there is proposed a waveguide filter comprising at least one cavity 4-delimited by at least two inductive irises. The filter furthermore comprises at least one floating insert 1 placed in one of the inductive irises. The invention is also a process for manufacturing the waveguide filter incorporating at least one insert.