Abstract: Device for transmitting/receiving frequency modulated type radar waves that includes: a circuit for generating radar waves which includes a voltage-controlled oscillator coupled to a circulator which is itself connected to a transmit/receive antenna; a detection circuit including a first mixer which is fed by the circulator and the voltage-controlled oscillator, wherein voltage-controlled oscillator incluing an input for injecting a signal generated by an additional circuit, the additional circuit having its input fed by the output signal of voltage-controlled oscillator and including a second mixer which is fed by two signals generated on the basis of the output signal of voltage-controlled oscillator.