毫米波折叠波导行波管的研究

采用等效电路方法和电磁场仿真软件Ansoft HFSS分析了折叠波导行波管的结构参数对其高频特性的影响,并在此基础上确定了Ka波段折叠波导行波管的尺寸.利用三维非线性粒子模拟软件MAGIC3D建立了两段式折叠波导行波管的模型,模拟研究了切断区长度和位置对折叠波导行波管的饱和输出功率及第2段电路单位长度增益的影响.最后设计了一个工作于33～36GHz的两段式折叠波导行波管,其输出功率的波动小于1dB,最大连续波输出功率达670W,对应电子效率高达7.55％.

Study on Millimeter Wave Folded Waveguide Traveling-Wave Tube

The influences of the dimensions of folded waveguide traveling-wave tube (TWT) on its high-frequency characteristics are investigated by the equivalent circuit method and simulation software, and the size of a Ka-band TWT is determined based on the investigation. A two-stage folded waveguide TWT is modeled by 3D particle in cell code MAG IC3D. The effect of a circuit sever on folded waveguide TWT's saturated output power and the gain growth rate of the second part circuit is simulated and analyzed. At the end of this paper, a two-stage folded waveguide TWT whose operating frequency band is in the 33 ~36GHz is designed. Simulations show that the amplifier produces a maximum radiation power of 670W at 35GHz, the corresponding electronic efficiency up to 7. 55%, and the fluctuation of the output power is less than 1dB.