To achieve stable oscillation, Zin + ZL=0 is the only necessary and sufficient condition to be satisfied by the microwave oscillator.

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For stable oscillation in a microwave oscillator, the Barkhausen criterion must be satisfied, which states that the loop gain must be equal to one (in magnitude) and the phase shift around the loop must be a multiple of 2π. The condition Zin + ZL = 0 (where Zin is the input impedance and ZL is the load impedance) is related to impedance matching for maximum power transfer, not directly to the conditions for stable oscillation.

To Achieve Stable Oscillation, Zin + ZL=0 Is the Only