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A locked low phase noise 20GHz signal is developed for the satellite communication. The strategy of the construction is on the component availability and low cost. The signal is multiplied from a 2.5GHz locked source. The locked loop for 2.5GHz source consists of a temperature controlled crystal oscillator (TCXO), voltage controlled oscillator (VCO), high-Q coaxial resonator, frequency synthesizer IC, and active loop filter. And the 20GHz signal is obtained sequentially by quadrupler and doubler frequency multiplier due to the capability of HEMT transistor.
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