A CAD design of narrow band dielectric resonator voltage controlled oscillator for using in phased-lock DROs

This paper presents a novel way of designing a dielectric-resonator VCO with a great stability, high output frequency, and more important, in a cheap way using CAD. In this new way of design, a parallel half wave transmissions line is coupled with a dielectric resonator and two varactors that are used to change the frequency of oscillation. The oscillation frequency is tuned on 11 GHz with ±4 MHz tolerance. The varactor diodes play a crucial role in this circuit; the capacitance of the diodes change as the voltage changes, so this changing in capacitance results in a change in the length of the transmission line; consequently, the output frequency of the circuit alters; in this way we have an oscillator. One of the eminent applications for this configuration is phase-locked DRO. This DRVCO was implemented and tested successfully.