Ka波段回旋行波管高效率输入耦合器设计

何友辉; 胡鹏; 陈洪斌

doi:10.11884/HPLPB202335.220287

Ka波段回旋行波管高效率输入耦合器设计

doi: 10.11884/HPLPB202335.220287

何友辉^{1, 2,},
胡鹏²,
陈洪斌^2, ,

1.
中国工程物理研究院研究生院，四川绵阳 621900
2.
中国工程物理研究院应用电子学研究所，四川绵阳 621900

详细信息

作者简介:
何友辉，heyouhui20@gscaep.ac.cn

通讯作者:
陈洪斌，ch_hongbin@126.com

中图分类号: TN129
计量
- 文章访问数: 491
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- PDF下载量: 71
- 被引次数: 0
出版历程
- 收稿日期: 2022-09-09
- 修回日期: 2023-05-04
- 录用日期: 2023-04-01
- 网络出版日期: 2023-05-16
- 刊出日期: 2023-08-15

Design of Ka band gyro-TWT high purity input structure

He Youhui^{1, 2
,},
Hu Peng²,
Chen Hongbin^{2
, ,}

1.
Graduate School of China Academy of Engineering Physics, Mianyang 621900, China
2.
Institute of Applied Electronics, CAEP, Mianyang 621900, China

摘要

摘要: 为了实现Ka波段回旋行波管高纯度TE₀₁模式输入，通过在输出口添加滤波结构，对二级功分TE₀₁输入耦合器进行改进，改进后杂散模式传输效率由平均7%下降至2%。该结构主体为一个级联的两级Y型功分网络，能高效地实现矩形波导TE₁₀模式到圆波导TE₀₁模式的转换。在基于传输线理论对功分网络的传输性能理论分析的基础上，借助三维电磁仿真软件进行多次优化迭代，最终得到了一个在31 GHz附近模式转换效率大于99%的宽带TE₀₁输入耦合器, 该输入耦合器具有5 GHz的−0.1 dB插入损耗带宽，同时有效频带内的平均模式转换效率高达98.6%，模式纯度在99%以上并且回波损耗小于−15 dB。采用矢量网络分析仪对该器件进行了背靠背冷测实验，结果表明，其带内衰减约为0.5 dB，与仿真计算结果偏差较小，符合工程实际需求。
- 回旋行波管 /
- 功分网络 /
- 输入耦合结构 /
- 高纯度 /
- 滤波结构 /
- 模式转换
Abstract: To realize the high-purity TE₀₁ mode input of the Ka-band cyclotron traveling wave tube, the two-stage power divider TE₀₁ input coupler is improved by adding a filter structure at the output port, and the transmission efficiency of the spurious mode is reduced from the original average of 7% to less than 2%. The main body of the structure is a cascading two-stage Y-type power divider network, which can efficiently realize the conversion of rectangular waveguide TE₁₀ mode to circular waveguide TE₀₁ mode. Based on the theoretical analysis of transmission performance of power divider network based on transmission line theory, and with the help of 3D electromagnetic simulation software, several optimization iterations are carried out, and finally a wideband TE₀₁ input coupler with mode conversion efficiency greater than 99% near the frequency of 31 GHz is obtained, the input coupling structure has a −0.1 dB insertion loss bandwidth of 5 GHz, and the average mode conversion efficiency in the effective frequency band is as high as 98.6%, the mode purity is 99% and the return loss is less than −15 dB. Back-to-back cold test experiments were carried out on the device using vector network analyzer, and the results show that the in-band attenuation is about 0.5 dB, which deviates little from the simulation calculation result, which meets the actual engineering requirements.
- gyro-TWT /
- power distribution network /
- input coupling structure /
- broadband /
- filter structure /
- mode conversion

HTML全文

图 1 两级功分型输入耦合器结构示意图

Figure 1. Schematic diagram of two-stage power divider input coupler

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图 2 功分网络传输线模型示意图

Figure 2. Schematic of power divider travelling line

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图 3 Ka波段回旋行波管功分输入结构传输性能及其偏差分析

Figure 3. Transmission performance and deviation analysis of the Ka band gyro-TWT power divider input structure

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图 4 功分输入耦合器电场分布

Figure 4. Electric field distribution of the input coupler

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图 5 宽度参量对功分输入耦合器传输性能影响

Figure 5. Influence of width parameters on transmission performance of the power divider input coupler

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图 6 长度参量对功分输入结构传输性能影响

Figure 6. Influence of length parameters on transmission performance of the power divider input structure

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图 7 加载金属片前后输出口传输性能

Figure 7. Transmission performance comparison between grooved and ungrooved structure

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图 8 加载金属片滤波的功分输入结构

Figure 8. Power divider input structure with groove filter

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图 9 加载金属片滤波的功分输入结构传输场

Figure 9. Electric field distribution of the power divider input structure with groove filter

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图 10 金属片结构参数对TE₂₁模式传输性能影响

Figure 10. Influence of metal sheet structure parameters on transmission performance of TE₂₁ mode

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图 11 功分输入耦合器冷测实验现场

Figure 11. Back to back cold test experiment of power division input coupler

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图 12 仿真结果与冷测结果对比

Figure 12. Comparison between simulation and cold test

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表 1 功分输入结构的最终结构参数

Table 1. Final structure parameter of power divider input structure

a/mm	b/mm	R/mm	R_c/mm	W₁/mm	W₂/mm	W₃/mm	L₁/mm	L₂/mm	L₃/mm	d/mm	sheet metal size
7.112	3.556	6.41	4.57	1.78	0.90	3.0	22.9	3.00	12.1	3.556	2.24 mm×7.38 mm×0.5 mm

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表 2 功分输入结构性能对比

Table 2. Comparison of power divider input structure performance

structure	plug loss relative bandwidth/%	maximum mode conversion efficiency/%	mode purity/%
Qiao Yiming^[7]. 220 GHz TE₁₀-TE₀₁ sidewall coupled mode converter.	1.0 dB bandwidth 6.8	99.0	−
Yu C F^[8]. High-performance circular TE₀₁-mode converter.	1.0 dB bandwidth 18.2	98.5	99.0
Zhang Qiang^[10]. Circular waveguide TE₀₁ mode converter design.	0.1 dB bandwidth 6.6	99.9	−
Sun Hao^[9]. W-band cyclotron broad band low-loss input coupler design.	0.1 dB bandwidth10.5	99.8	96.8
structure of this work.	0.1 dB bandwidth 14.5	100.0	99.3

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