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Experimental Studies on a 1-kW High-Gain <inline-formula> <tex-math notation="LaTeX">$S$ </tex-math> </inline-formula>-Band Magnetron Amplifier With Output Phase Control Based on Load–Pull Characterization

2018; Institute of Electrical and Electronics Engineers; Volume: 46; Issue: 4 Linguagem: Inglês

10.1109/tps.2018.2814598

1939-9375

Zhenlong Liu, Xiaojie Chen, Meng‐Lin Yang, Kama Huang, Changjun Liu,

GaN-based semiconductor devices and materials

A high power gain magnetron amplifier with output phase control based on load-pull characterization has been developed. The equivalent resonant cavity method was first introduced to facilitate the proposed magnetron amplifier system as a basic injection model, and the system behavior was qualitatively evaluated based on Alder's equation. It is the first time that a magnetron has been locked at a 58-dB gain. The magnetron amplifier shows an enhanced power-added efficiency of 72.0%, wide output phase control range, and 18.5-MHz bandwidth at a ratio of the output to the input power of 45 dB. This is the first time a successful magnetron output phase control based on load-pull at a power gain of 45 dB has been demonstrated. The magnetron output spectra were fully synchronized with a reference signal and the phase noise of the magnetron amplifier reached -106.3 dBc/Hz at an offset of 1 kHz. An output amplitude stability of 0.01 dB (peak to peak), a phase stability of 0.5° (peak to peak), and a high-efficiency dual 1-kW magnetron amplifier coherent-power combination based on the load-pull characterization was achieved. To the best of the authors' knowledge, this is one of the highest power gains and phase noise performances ever reported for an S-band injection-locked magnetron with a power output of over 1 kW.