Thales

Wilfried Demenitroux

Nicolas Berthou

Olivier Jardel

Stéphane Miquel

Pierre-Yves Mailloux

Lucas Mandica

Kevin Lethien

Hughes Augereau

Cédrick Saboureau

Dilan Albert

A radiofrequency device includes at least the following elements: an antenna, linked to a first transmission channel or reception channel selection device K, followed by a front-end stage whose output is linked to a second transmission channel or reception channel selection device K, a group of filters connected between the second selection device Kand a third transmission channel or reception channel selection device K, the third selection device Kis connected to a transceiver, the transceiver comprises a converter part, wherein the group of filters comprises N filters having distinct frequency bands Bin a given bandwidth B, the group of filters is linked to a manager selecting at least one of the filters Fj of the group of filters in order to attenuate a first type of disturbing signals P, in the vicinity of the centre frequency of the channel to be received, the transceiver comprises a stage comprising a variable filter, the variable filter is configured in order to eliminate a second type of disturbing signals P, the stage is connected between the group of filters and the analog-digital and digital-analog conversion set, the number N of filters of the group of filters is chosen by taking into account the operating frequency band value of the antenna, the value of a selected bandwidth Bc and a coefficient δ taking into account overlap effects.

Radiofrequency device

A device for controlling the efficiency of a scanning active antenna includes at least two transmission paths Tx, a transmission path comprising a phase control module, and a power stage at the output of which a radiating element is arranged, comprising at least: a voltage modulator located upstream of the power stage of each of the radiating elements, a control device transmitting a PWM drain voltage control signal configured so as to manage the gain of a power stage in accordance with a predefined first bias law and to control the phase applied to the drain of the power stage in accordance with a second bias law.

Device for controlling a scanning active antenna

A system for adapting the voltage of a drain of a power stage includes at least two transmission paths T, a transmission path comprising a resistive element (), a phase control module (), and a power stage () at the output of which a radiating element (E) is arranged, comprising at least: a device () for determining the value of a reflected power P, the value of an incident power Pin a power stage, and the ratio of the powers R, an analogue device () configured so as to pulse width-modulate the difference signal, a switching cell () receiving a low-power PWM signal and designed to generate a power signal PWMthat is transformed, by a low-pass filter (), into a bias signal for biasing the power stage in accordance with a predefined bias control law.

System for adapting the voltage of a drain of a power stage

Operating in a low frequency band and a high frequency band, the device includes at least a first amplification module capable of operating in the high band, the amplification of which is modulated according to a tracking of the envelope of the input signal of the device, capable of being linked at the output to an antenna adapted to the high band; a second amplification module capable of operating in the low band and of performing the envelope tracking; a switch switching the output of the second amplification module to an antenna adapted to the low band, when the amplification device is operating in the low band; to the first amplification module to control the drain voltage of the first module according to the envelope tracking, when the amplification device is operating in the high band.

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Cholet, France

Wilfried Demenitroux