Radiofrequency device

Abstract

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.