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分析了多层圆柱形蓝宝石腔体谐振器为实现Bragg谐振模式需满足的尺寸条件。仿真并设计了单层腔体,利用teflon支撑件将蓝宝石固定在内部镀银的金属腔体内。其在9.7GHz频点实现了Bragg包含模式,Q值高于200 000。利用该谐振器作为带通滤波器构建了室温下的X波段振荡器。该振荡器还包括低噪放、滤波器和手动移相器。通过合理选择谐振器的插入损耗和调节移相器,该振荡器成功实现了稳定输出。测试结果表明,该振荡器具有低的相位噪声但易受环境温度影响。由于采用了极高Q值的蓝宝石谐振器,该振荡器可能成为目前最低相噪的X波段室温频率基准。
The dimensional conditions of multi-layer cylindrical sapphire cavity resonators for Bragg resonance mode are analyzed. The single-layer cavity was simulated and designed, and the sapphire was fixed inside the silver-plated metal cavity by teflon support. The Bragg inclusion mode is implemented at the 9.7GHz frequency with Q values higher than 200,000. Using this resonator as a band-pass filter, an X-band oscillator at room temperature was constructed. The oscillator also includes low noise amplifier, filter and manual phase shifter. By reasonably selecting the insertion loss of the resonator and adjusting the phase shifter, the oscillator successfully achieved a stable output. Test results show that the oscillator has low phase noise but is susceptible to ambient temperature. Due to its extremely high Q-value sapphire resonator, the oscillator may be the lowest phase-to-noise X-band room temperature frequency reference available today.