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This paper describes the design of very low noise, tunable, Ku band Dielectric Resonator Oscillators (DROs) presenting phase noise performance of -100 dBc/Hz at 1 kHz offset and -130 dBc/Hz at 10 kHz offset. SiGe based transistors are used for the oscillator sustaining amplifiers which offer circulating power 10 dBm and gain of 4 dB per stage as well as low flicker noise corner between 10 kHz and 40 kHz. The resonator has unloaded Q around 15,000 at operating frequency and is then optimized and coupled to the amplifiers for minimum phase noise where QL/Q0=1/2 hence S21=-6 dB. In order to incorporate tuning, phase shifter is also investigated. The phase noise measurement system is presented using two DROs beating at the same frequency.