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Improvement of Phase Noise Characetristics of Reflective Type Push-Push Oscillator by Using Microstrip-Line Resonators

In recent years, microwave and millimeter-wave frequency bands have been widely used with the development of mobile communication. However, in such a high frequency band, there are problems that the manufacturing cost of oscillators is high and the phase noise characteristic is not enough. Among high-frequency oscillators, a Push-Push oscillator is a harmonic oscillator that can be manufactured with low cost. In this study, an improvement method of the phase noise characteristics for the Push-Push oscillator is proposed. By using microstrip-line resonators coupled with the resonator used in the oscillator, the phase noise is improved by around 4 dB at 1-MHz offset frequency.