Low phase noise push-push microstrip oscillator with third harmonic output on basis of SIW resonator

Abstract

The results of the low phase noise microstrip oscillator design with 11.4 GHz output are presented in the paper. The oscillator is stabilized by the SIW resonator and performed in the push-push circuit. In contrast to traditional even harmonics output, the third harmonic output is used. This made it possible to suppress even harmonics in the oscillator branches, which contributed to the phase noise reduction. Phase noise of the designed oscillator is measured to be no more than -98 dBc/Hz, -115 dBc/Hz, and -132 dBc/Hz at 10 kHz, 100 kHz, 1 MHz offsets from carrier, respectively.