A Harmonic Synchronized Oscillator using Gunn Diodes Embedded on Slot Line Resonators

This paper represents a novel second harmonic power combining oscillator using mutually synchronized Gunn diodes embedded on slot line resonators. A both-sided MIC technology is adopted in the oscillator. The oscillator consists of Gunn diodes, slot line resonators and microstrip lines. By embedding Gunn diodes on slot line resonators, desired harmonic RF signal can be generated very easily. The microstrip lines are used for the power combining output circuit. This oscillator has practical advantages such as easy circuit design, simple circuit configuration and miniaturization of the circuit size. The second harmonic oscillator is designed and fabricated in K-Band. The output power is +5.75dBm at the design frequency of 19.0 GHz with the phase noise of -111.7 dBc/Hz at the offset frequency of 1MHz. Excellent suppression of the undesired fundamental frequency signal of -39dBc is achieved.