A novel K-band push-push oscillator using slot ring resonator embedding Gunn diodes

In this paper, a novel Gunn diode push-push oscillator is proposed. Gunn diodes and a slot ring resonator are used for the oscillator. A double-sided circuit technology is adopted successfully. The oscillator consists of four Gunn diodes, a slot ring resonator and microstrip lines for the output circuit. The Gunn diodes are arranged on the slot ring resonator formed on a dielectric substrate. The microstrip lines, output circuit is formed on the reverse side. The oscillator is designed and fabricated in K-band. The measured output power of the desired second harmonic signal is +3.16 dBm at the frequency of 19.2 GHz. The measured phase noise is -108.5 dBc/Hz at 1 MHz offset frequency. The oscillator is designed easily due to the very simple structure and achieves low phase noise performance with low cost by using the advantages of Gunn diode oscillator.