A device for phase-shifting a radiofrequency signal, comprising a first carrier (SF, SF', SF", SF′′′) and a second carrier (SM, SM', SM", SM"'), the first carrier (SF, SF', SF", SF′′′) and the second carrier (SM, SM', SM", SM′′′) being mounted so as to allow relative translational or rotational movement, an input port and an output port for radiofrequency signals being formed on the first carrier (SF, SF', SF", SF"'), wherein the phase-shifting device comprises: a first array of conductive pads (RP1, RP1', RP1") that are distributed over the first carrier (SF, SF', SF", SF′′′) and extend from the input port, a second array of conductive pads (RP2, RP2', RP2") that are distributed over the second carrier (SM, SM', SM", SM′′′), the first carrier (SF, SF', SF", SF′′′), the second carrier (SM, SM', SM", SM′′′), the first array of conductive pads (RP1, RP1', RP1") and the second array of conductive pads (RP2, RP2', RP2") being arranged to form a structure for guiding radiofrequency signals of variable length and having a rectangular cross section that connects the input port and the output port, the first array of conductive pads (RP1, RP1', RP1") and the second array of conductive pads (RP2, RP2', RP2") being configured such that the cross section and the length of the guide structure are modified, over at least a portion of the propagation path for the radiofrequency signals through the guide structure, as the first carrier (SF, SF', SF", SF′′′) moves relative to the second carrier (SM, SM', SM", SM′′′), characterised in that the coupling device comprises a guided portion of constant dimensions (TGE, TGE', TGE") at a first access (AC1, AC1', AC1"), a third array of conductive pads (RP3, RP3', RP3") and a fourth array of conductive pads (RP4, RP4', RP4"), and the first array of conductive pads (RP1, RP1', RP1") and the second array of conductive pads (RP2, RP2', RP2") being coupled to the guided portion of constant dimensions (TGE, TGE', TGE") at a first access (AC1, AC1', AC1"), the guided portion of constant dimensions (TGE, TGE', TGE") being coupled, at a second access (AC2, AC2', AC2"), to the third array of conductive pads (RP3, RP3', RP3") and to the fourth array of conductive pads (RP4, RP4', RP4"), the third array of conductive pads (RP3, RP3', RP3") and the fourth array of conductive pads (RP4, RP4', RP4") being arranged on the first carrier (SF, SF', SF", SF′′′) and the second carrier (SM, SM', SM", SM′′′), respectively, the guide structure being also formed by the third array of conductive pads (RP3, RP3', RP3") and by the fourth array of conductive pads (RP4, RP4', RP4") such that the cross section of the guide structure is modified, at the third array of conductive pads (RP3, RP3', RP3") and the fourth array of conductive pads (RP4, RP4', RP4"), as the first carrier (SF, SF', SF", SF′′′) moves relative to the second carrier (SM, SM', SM", SM′′′). a first array of conductive pads (RP1, RP1', RP1") that are distributed over the first carrier (SF, SF', SF", SF′′′) and extend from the input port, a second array of conductive pads (RP2, RP2', RP2") that are distributed over the second carrier (SM, SM', SM", SM′′′), the first carrier (SF, SF', SF", SF′′′), the second carrier (SM, SM', SM", SM′′′), the first array of conductive pads (RP1, RP1', RP1") and the second array of conductive pads (RP2, RP2', RP2") being arranged to form a structure for guiding radiofrequency signals of variable length and having a rectangular cross section that connects the input port and the output port, the first array of conductive pads (RP1, RP1', RP1") and the second array of conductive pads (RP2, RP2', RP2") being configured such that the cross section and the length of the guide structure are modified, over at least a portion of the propagation path for the radiofrequency signals through the guide structure, as the first carrier (SF, SF', SF", SF′′′) moves relative to the second carrier (SM, SM', SM", SM′′′), characterised in that the coupling device comprises a guided portion of constant dimensions (TGE, TGE', TGE") at a first access (AC1, AC1', AC1"), a third array of conductive pads (RP3, RP3', RP3") and a fourth array of conductive pads (RP4, RP4', RP4"), and the first array of conductive pads (RP1, RP1', RP1") and the second array of conductive pads (RP2, RP2', RP2") being coupled to the guided portion of constant dimensions (TGE, TGE', TGE") at a first access (AC1, AC1', AC1"), the guided portion of constant dimensions (TGE, TGE', TGE") being coupled, at a second access (AC2, AC2', AC2"), to the third array of conductive pads (RP3, RP3', RP3") and to the fourth array of conductive pads (RP4, RP4', RP4"), the third array of conductive pads (RP3, RP3', RP3") and the fourth array of conductive pads (RP4, RP4', RP4") being arranged on the first carrier (SF, SF', SF", SF′′′) and the second carrier (SM, SM', SM", SM′′′), respectively, the guide structure being also formed by the third array of conductive pads (RP3, RP3', RP3") and by the fourth array of conductive pads (RP4, RP4', RP4") such that the cross section of the guide structure is modified, at the third array of conductive pads (RP3, RP3', RP3") and the fourth array of conductive pads (RP4, RP4', RP4"), as the first carrier (SF, SF', SF", SF′′′) moves relative to the second carrier (SM, SM', SM", SM′′′).