2nd Harmonic Power Enhancement of FET DRO with Additional Dielectric Resonator

Abstract

This paper reports that the output signal power of a series feedback FET DRO (dielectric resonator oscillator), at the second harmonic frequency, can be significantly enhanced with an additional DR (dielectric resonator) at the drain port. This enhancement has been observed by an experiment and analyzed based on reflection and feedback mechanism between two DRs. Finally we propose that there is an optimum reflection condition and location of the second DR to extract the maximum output power at the second harmonic frequency from the FET DRO