Abstract: The microwave oscillator, including a transistor (1), e.g. a field-effect transistor, includes a first resonating circuit (2) connected to a first terminal and a second resonating circuit (3) connected to a second terminal of said transistor, each resonating circuit including a microstrip (4,6), to which is coupled a dielectric resonator 5,7, both resonators of both resonating circuits being similar and operating at the same resonating frequency, third terminal of said transistor defining a power output. The oscillator provides two outputs of lower power but with a high Q.sub.ext, and an output of higher power with a medium Q.sub.ext.