隧道二极管中注入诱导猝灭产生的巨共振反射增益

中文摘要 AI 辅助

负阻微波振荡器能够同时维持自主振荡并相干散射电磁波，从而实现超越传统线性放大的有源反射。本文演示了在约2.96 GHz频率下工作的自持隧道二极管振荡器中，由同步诱导的相位局域化产生的巨共振反射增益。弱共振射频注入驱动系统从宽带自由运行状态转变为相位局域化的窄带反射载波。所产生的反射增强相对于注入信号达到83.1 dB，并伴随超过一个数量级的线宽压缩、非线性注入牵引以及15.84 kHz的同步带宽。时间分辨频谱图直接解析了注入锁定和频率牵引过程，而有噪声的Stuart-Landau模拟重现了观察到的频谱集中现象以及接近Hopf失稳时随失谐变化的增益滚降。通过宽带偏置噪声人为增加相位扩散会抑制反射增强，从而证实同步诱导的相位涨落猝灭是巨相干反射增益的根源。

英文摘要

Negative-resistance microwave oscillators can simultaneously sustain autonomous oscillations and coherently scatter electromagnetic waves, enabling active reflection beyond conventional linear amplification. Here we demonstrate giant resonant reflection gain from synchronization-induced phase localization in a self-sustained tunnel diode oscillator operating near 2.96 GHz. Weak resonant RF injection drives a transition from a broadband free running state to a phase localized narrowband reflected carrier. The resulting reflected enhancement reaches 83.1dB relative to the injected signal and is accompanied by greater than order of magnitude linewidth collapse, nonlinear injection pulling, and a synchronization bandwidth of 15.84 kHz. Time resolved spectrograms directly resolve injection locking and frequency entrainment, while noisy Stuart Landau simulations reproduce the observed spectral concentration and detuning dependent gain roll off near the Hopf instability. Artificially increasing phase diffusion with broadband bias noise suppresses the reflected enhancement, confirming synchronization-induced quenching of phase fluctuations as the origin of the giant coherent reflection gain.

发表机构

• Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）

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