Mixer circuit with image frequency rejection, in particular for an RF receiver with zero or low intermediate frequency

An RF receiver of zero or quasi-zero intermediate frequency, the receiver comprising an amplifier (3) connected to a receive antenna (1) via a bandpass filter (2), the signal received by the antenna being applied, after amplification, to a mixer circuit for converting the amplified input signal to baseband, said mixer circuit being connected to a local oscillator (10) and delivering two baseband signals in quadrature (phase offset of 90°), which signals are filtered and then applied to a demodulator (8), the RF receiver being characterized in that the mixer circuit comprises a mixer circuit (40) of the image frequency rejection type comprising a quadrature phase divider (30′) having an input (Fi) connected to the local oscillator (10) and two outputs respectively delivering two signals in phase quadrature which are applied respectively to two simple mixers (31′, 32′), a quadrature phase and frequency divider (33′) having a frequency division ratio and presenting two inputs respectively connected to the respective outputs of the two simple mixers (31′, 32′), and a first output delivering a first output signal (Fo) which is applied to the inputs of the two simple mixers (31′, 32′), the first output signal (Fo) being mixed with the received and amplified signal by the two simple mixers (4, 4′).