A microstrip L-band bipolar dielectric resonator stabilized oscillator (DRO) devised in a moderate size (2 ft x 5 in x 3.6 in), low-cost, reproducible circuit. Embedment of back to back varactors in the DRO provide voltage tuning for phase lock application without compromise of noise performance. Extremely low phase noise with a low 1/f noise corner is achieved and the DRO is essentially constant in frequency and output power over ...