单层反射模式蓝宝石腔体的9.7GHz频率基准

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。

9.7GHz oscillator based on single sapphire layer loaded cavity at reflect mode

This paper analyzes the dimension condition of multilayer cylinder sapphire-loaded-cavity resonator to meet the requirement of Bragg mode. Single layer cavity is simulated and designed. Teflon support is used to fix the sapphire in the inner-silver-plated cavity. Test shows that Bragg mode is realized at 9.7GHz and the quality value is great than 200,000. The Bragg mode is being used as band pass filter to build X band oscillator, which includes low noise amplify, filter and mechanical phase shifter. The oscillator realized stabilization by choosing proper insert loss and adjusting phase shifter. Test shows that the oscillator has low phase noise output and is vulnerable to environment temperature. For ultra high quality value sapphire resonator is being used, the oscillator has the potential to be state-of-art X band frequency standard with lowest phase noise at room temperature.