Concurrent multiband transceiver

An RF front-end adapted to perform either in a receiving mode or in a transmitting mode and adapted to receive or transmit signals located in at least two separated frequency bands, respectively comprising an input and an output and further comprising

• an input and an output;
• an input matching circuit comprising a first input coupled to the input,
• an output matching circuit coupled to the output;
• the input matching circuit being coupled to the output matching circuit via respective first amplifier and second amplifier;
• a phase shifter coupled either to the input of the RF front-end in a transmitting mode, or to the output of the RF front-end in a receiving mode;
• wherein the phase shifter provides at its output an odd multiple of 180° phase shift of a signal situated in a first frequency band applied to its input and
• wherein the phase shifter provides at its output an even multiple of 180° phase shift of a signal situated in a second frequency band applied to its input.