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本文设计了220 GHz三注折叠波导慢波电路,并对其放大特性进行了分析。利用等效电路法对慢波电路结构色散特性与轴向耦合阻抗进行了计算,并通过三维高频仿真软件HFSS进行了模拟验证。利用三维电磁仿真软件CST-PS的PIC求解器对该慢波结构的三维大信号的注波互作用进行了粒子仿真,结果表明:在工作中心频率为220 GHz时,三注折叠波导慢波电路输出功率达到49.7 W,增益达到了37.05 dB,3 dB带宽为13 GHz(212~225 GHz)。最后分析了边缘电子注的注电压和注电流的减小对该结构放大性的影响。
In this paper, a 220 GHz three-note folded waveguide slow-wave circuit is designed and its amplification characteristics are analyzed. The equivalent circuit method was used to calculate the dispersion characteristics and axial coupling impedance of the slow-wave circuit. The simulation was verified by three-dimensional HFSS software. The particle simulations of the three-dimensional large-signal wave-injection interaction of the slow-wave structure are carried out by using the PIC solver of the CST-PS software. The results show that when the center frequency of the work center is 220 GHz, The output power reaches 49.7 W, the gain reaches 37.05 dB, and the 3 dB bandwidth is 13 GHz (212 to 225 GHz). Finally, the effect of the decrease of the injection voltage and the injection current of the edge electron injection on the magnification of the structure is analyzed.