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Two microwave oscillators at a free-running frequency of approximately 800 MHz are designed. Both were designed to have the same feedback factors; the difference lies in the output loading circuit. By using the inverted common collector (ICC) configuration, a stable negative resistance is generated. This negative resistance is then used to compensate for the loss in the feedback path. Hence, a zero resistance loaded oscillator is implemented. A comparative study with experimental support confirmed that the zero loaded oscillator has a 6 dB and 18 dBc improvement in the phase noise and second harmonic rejection, respectively.