low phase noise x-band dielectric resonator oscillator

In this article, an x-band low phase noise dielectric resonator oscillator is investigated. for this purpose, a dielectric resonator as a frequency stabilization section at the almost center frequency of 12 ghz is designed. the active device is a packaged gaas fet (an atf-36077 phemt). firstly, the atf36077 microwave transistor has been biased. the substrate of this nonplanar oscillator is rogers rt/duroid 5880. finally, the dielectric resonator oscillator has been introduced as a series feedback structure. this presented x-band dielectric resonator oscillator, operating at nearly 12 ghz, exhibits a phase noise of -71 dbc/hz and -133 dbc/hz at 1-khz and 1-mhz frequency offset, respectively. also, the output power level of nearly 7 dbm is achieved. the second and third harmonic power levels are more than 50 db and 30 db lower than the main harmonic power level.