The invention refers to an RF front-end (100) adapted to receive or transmit signals located in at least two separated frequency bands (100) comprising an input and an output and further comprising a first phase shifter (5) coupled to the input of the RF front-end (100); a second phase shifter (6) coupled to the output of the RF front-end (100); the first phase shifter (1) being coupled to the second phase shifter (2) via a first amplifier (3) and second amplifier (4), respectively.