波导-同轴线的脊型转换器设计与测试

张辉; 慕振成; 荣林艳; 王博; 万马良; 谢哲新; 周文中; 李松; 刘美飞

doi:10.11884/HPLPB202133.210105

波导-同轴线的脊型转换器设计与测试

doi: 10.11884/HPLPB202133.210105

张辉^{1, 2,},
慕振成^{1, 2},
荣林艳^{1, 2},
王博^{1, 2},
万马良^{1, 2},
谢哲新^{1, 2},
周文中^{1, 2},
李松^{1, 2},
刘美飞^{1, 2}

1.
中国科学院高能物理研究所，北京 100049
2.
散裂中子源科学中心，广东东莞 523803

详细信息

作者简介:
张　辉，zhanghui@ihep.ac.cn

中图分类号: TN015
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-22
- 修回日期: 2021-03-26
- 网络出版日期: 2021-09-14
- 刊出日期: 2021-10-15

Design and test of device for transition from ridge waveguide to coaxial line

Zhang Hui^{1, 2
,},
Mu Zhencheng^{1, 2},
Rong Linyan^{1, 2},
Wang Bo^{1, 2},
Wan Maliang^{1, 2},
Xie Zhexin^{1, 2},
Zhou Wenzhong^{1, 2},
Li Song^{1, 2},
Liu Meifei^{1, 2}

1.
Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
2.
Spallation Neutron Source Science Center (SNSSC), Dongguan 523803, China

摘要

摘要: 射频测量系统中经常会用到波导-同轴线转换器，主要是利用其将射频器件的波导端口转换成能够直接接入测量仪器的50 Ω同轴线。本文设计的648 MHz/WR1500波导同轴转换器主要用于CSNS升级工程（CSNS-II）超导直线射频器件的测量。利用切比雪夫脊型阶梯阻抗变换和探针耦合的方式实现波导到同轴线的转换。对脊加载波导和不连续同轴线分别进行了分析，得到最优尺寸。为了提高测量精度，设计的波导-同轴线转换器具有低插入损耗、低驻波比和宽带宽等特性。最后对生产的转换器进行了测试，测试结果与仿真结果相近，能够满足作为测量器件的使用要求。
- 散裂中子源 /
- 脊波导 /
- 同轴线 /
- 转换器 /
- 不连续
Abstract: Waveguide to coaxial line transtion is often used in RF measurement systems. To measure the network parameters of these RF devices with a vector network analyzer and other instruments, the transtion is indispensable to convert the waveguide ports of the RF devices to 50 Ω coaxial line which can directly access the network analyzer. The 648 MHz/WR1500 transformer designed in this paper is mainly used for the measurement of the superconducting linac RF devices at the China Spallation Neutron Source (CSNS) upgrading phase (CSNS-II). In this paper Chebyshev ridge ladder impedance transformation and probe coupling are adopted to complete waveguide to coaxial line transition. The ridge loaded waveguide and discontinuous coaxial line are analyzed respectively, and the optimal size is obtained. The designed transformer has the characteristics of low insertion loss, low VSWR and wide bandwidth to achieve high measurement accuracy. At last, the transition device is tested, and the test results are close to the simulation results, which can meet the requirements of being a measuring device.
- China Spallation Neutron Source /
- ridge waveguide /
- coaxial line /
- transtion /
- discontinuity

HTML全文

图 1 脊波导-同轴线转换器示意图

Figure 1. Schematic diagram of ridge waveguide to coaxial transition

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图 2 脊厚度对回波损耗的影响

Figure 2. Influence of thickness on return loss

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图 3 脊的位置对回波损耗的影响

Figure 3. Influence of location on return loss

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图 4 不连续性同轴线及其等效电路

Figure 4. Discontinuous coaxial line and its equivalent circuit

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图 5 不连续电容C_d曲线（α=a/b）

Figure 5. Discontinuous capacitance C_d curve

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图 6 不同间隙半径比a/b情况下的回波损耗

Figure 6. Return loss with different a/b

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图 7 探针半径对回波损耗的影响

Figure 7. Influence of radius on return loss

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图 8 探针长度对回波损耗的影响

Figure 8. Influence of length on return loss

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图 9 脊波导和同轴线的电场分布

Figure 9. Distribution of electric field in ridge waveguide and coaxial line

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图 10 S参数仿真曲线

Figure 10. S parameters simulation curve

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图 11 （a）转换器纵向切面图，（b）聚四氟乙烯加工图，（c）内导体及探针加工图

Figure 11. (a) Cross section of transition，(b) teflon machining dimension and (c) inner conductor and probe machining dimension

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图 12 （a）转换器侧视图及探针，（b）转换器正视图及脊

Figure 12. (a) Side view of transition and probe，(b) front view of transition and ridge

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图 13 实际产品测试曲线

Figure 13. Product test curves

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