Patent ID: 8018290

Claim:
An oscillator, comprising: an active element configured to oscillate at a designated oscillation frequency to generate a signal of the oscillation frequency and to generate a signal of a 2N-fold frequency of the oscillation frequency; an inductor connected between an emitter terminal of the active element and a ground; a first open-ended stub connected to a collector terminal of the active element and having a line length equal to a quarter of the wavelength of the signal of the 2N-fold frequency of the oscillation frequency; a first output terminal provided at a connecting point between the collector terminal of the active element and the first open-ended stub, to output the signal of the oscillation frequency generated by the active element; a second open-ended stub connected to a base terminal of the active element and having a line length longer than a quarter of the wavelength of the signal of the oscillation frequency; and a second output terminal provided at a position separated from an end of the second open-ended stub by a distance equal to a quarter of the wavelength of the signal of the oscillation frequency, to output the signal of the 2N-fold frequency of the oscillation frequency generated by the active element.