Design of broad-band input coupler of W-band TE02 mode gyro-TWT
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摘要: 输入耦合器是回旋行波管的重要组成部分之一，其作用是将矩形波导TE10模式的信号，通过模式变换结构转换为回旋放大器件中的模式，输入耦合器性能的优劣直接影响了回旋管整管的带宽等性能。通过对W波段TE02模式回旋行波管的输入耦合器进行理论分析，指出影响主模传输损耗的一个因素是杂模的崛起使主模的传输系数降低，利用仿真软件进行仿真，通过优化耦合孔的尺寸，抑制杂模的产生，将损耗从3.9 dB降低到了0.8 dB。根据优化尺寸加工，实际测试，得到3.0 dB带宽7.9 GHz的输入耦合器，与设计符合较好。Abstract: In this paper, the input coupler for W-band gyro-TWT is designed to meet the needs of the signal transmission and mode conversion. The input coupler is potential device to be the essential section determining the bandwidth of the whole gyro-TWT. The theoretical analysis of the input coupler of the W-band TE02 mode gyro-TWT is carried out. It is pointed out that one factor affecting the transmission loss of the main mode is that the rise of the miscellaneous modes reduces the transmission coefficient of the main mode, and simulation is done to suppress the miscellaneous modes by optimizing the sizes of the coupling hole, reducing the loss from 3.9 dB to 0.8 dB. According to the simulation sizes processing and cold testing, the final input coupler with 3 dB bandwidth of 7.9 GHz meets the design requirements.
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Key words:
- W-band /
- gyro-TWT /
- TE02 mode /
- input coupler /
- cold test
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图 3 同轴腔TE811传播常数及谐振腔长度与半径rb的关系
Figure 3. TE811 propagation constant in coaxial guide and length vs raidus rb
图 6 耦合缝长度偏移对TE01模式S21参数的影响
Figure 6. Dependence of parameter S21 of TE01 mode on the length deviation of slot
图 7 耦合缝宽度偏移对TE01模式S21参数的影响
Figure 7. Dependence of parameter S21 of TE01 mode on the width deviation of slot
图 11 杂模对输入耦合器S21参数的影响
Figure 11. Dependence of the input coupler’s parameter S21 on the miscellaneous modes
图 13 HFSS仿真和冷测实验的S21参数对比
Figure 13. Comparison of parameter S21 between HFSS simulation and cold test
表 1 输入耦合器的初始结构
Table 1. Input coupler initial structures
(mm) coaxial cavity outer radius coaxial cavity inner radius coaxial cavity length circular waveguide coupler aperture 5.5 4.23 2.901 3.65 0.6×1.344 
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表 2 输入耦合器的优化结构
Table 2. Input coupler optimization structures
(mm) coaxial cavity outer radius coaxial cavity inner radius coaxial cavity length circular waveguide coupler aperture 5.47 4.45 2.92 3.65 0.67×1.35
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