Frequency Stabilization of Power-Combining

In this paper, we report results of phase locking of grid oscillator arrays. First, a voltage-controlled grid oscillator array with a center frequency of 4.7 GHz and with a 300-MHz electric tuning range was locked to a frequency synthesizer through a phase-locked loop. Second, a 4 4 and a 6 6 grid oscillator arrays were locked by way of the injection locking. In both methods, a simple loop antenna mounted on the reflection mirror was used for taking/injecting signal from/to the array. Results show that the phase noise performance is improved significantly in the locked oscillator arrays. Index Terms—Frequency stabilization, grid oscillator, injection locking, phase-locked loop, spatial power combining, VCO.

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