Design of X-band low phase noise sapphire oscillator
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摘要: 设计了一款低相噪蓝宝石振荡器并对其进行温度控制，基于蓝宝石谐振器理论，采用有限元仿真软件完成了蓝宝石谐振器设计。蓝宝石谐振器实测中心频率为9.84 GHz，有载Q值113 000。将该蓝宝石谐振器作为选频网络与放大器、滤波器、移相器和耦合器构成低相噪蓝宝石振荡器。振荡器的输出工作频率9.84 GHz，输出功率9 dBm，偏离载波1 kHz处相位噪声为−117 dBc/Hz，偏离载波10 kHz处相位噪声为−144 dBc/Hz，偏离载波100 kHz处相位噪声为−161 dBc/Hz。该振荡器有助于提高雷达对于低慢小目标的检测能力。Abstract: The paper presents the design and temperature control of a low phase noise sapphire oscillator. Utilizing the theory of sapphire resonator, finite element simulation software is employed to accomplish the design process. The measured center frequency of the sapphire resonator is 9.84 GHz with a loaded Q value of 113000. By utilizing the sapphire resonator as a frequency selection network along with components such as amplifier, filter, phase shifter and coupler, a low-noise sapphire oscillator is constructed. The output frequency of this oscillator is 9.84 GHz with an output power of 9 dBm. It exhibits excellent performance in terms of phase noise: −117 dBc/Hz at 1 kHz deviation from the carrier, −144 dBc/Hz at 10 kHz deviation from the carrier, and −161 dBc/Hz at 100 kHz deviation from the carrier. This oscillator significantly enhances radar capabilities for the detection of low-speed and small targets.
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表 1 蓝宝石谐振器仿真结果
Table 1. Simulation results of the sapphire resonator
eigenmode frequency/GHz Q value mode1 9.791 46 202 399 mode2 9.862 38 202 418 mode3 9.917 88 30 346 mode4 9.918 09 30 378 mode5 9.946 75 19 859 mode6 9.946 80 19 860 
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