Bidirectional frequency mixer, radiofrequency emitter/receiver system comprising at least one such mixer

The invention claims a two-way mixer and at least comprises this utility model claims a mixer of the radio frequency transceiver system. The mixer comprises two the middle frequency fi is separated from the end port of the one which is used for receiving the other one is used for sending and the first radio frequency rf of the common interface it not only can be used for receiving and it is used for sending. It also comprises at least four mixing unit and three for removing mixing unit produced by it does not need to the frequency of the phase shifting device. The mixer to obtain the sending stage the local oscillator the frequency is restrained and the receiving stage of image phase is suppressed. The invention is especially suitable for designing microwave integrated circuit especially the frequency band millimetre.