Performance study of resonant ring and rectangular flexible waveguide
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摘要: 为了解决波导传输线中硬连接问题，部分波导组件将使用软波导，但软波导的使用会带来传输线损耗的增大。为了探究其在真实工作条件下的损耗和电热情况，搭建了基于谐振环的测试平台，谐振环行波功率增益为13.4 dB，通过两个2 kW功率放大器，成功在波腹位置实现了140 kW的等效功率。根据仿真和实验结果，对矩形软波导进行了优化设计，改进其结构和材料，以更好地应对高功率输入下的热形变和应力问题。优化后的软波导电热性能表现优于国外同类型产品。Abstract: To solve the problem of hard connection in waveguide transmission line, some waveguide components will use flexible waveguide, but the use of flexible waveguide will bring about the increase of transmission line loss. Aiming to investigate its loss and electrical heating under real operating conditions, we built a test platform based on a resonant ring with a 13.4 dB power gain in the traveling wave of the resonant ring, which successfully achieves an equivalent power of 140 kW at the position of the antinode by means of two 2 kW power amplifiers. Based on the results of simulations and experiments, we optimized the design of the rectangular flexible waveguide and improved its structure and materials to better cope with the thermal deformation and stress under high power input. The optimized flexible waveguide's electrical and thermal performance is better than that of similar foreign products.
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Key words:
- flexible waveguide /
- high power /
- transmission line /
- resonant ring /
- accelerator
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图 1 基于谐振环的双端口测试平台结构示意图
Figure 1. Schematic structure of the resonant ring-based dual-port test platform
图 2 650 MHz谐振环的主要部件结构图
Figure 2. Diagram of the main components of the 650 MHz resonant ring
图 3 基于谐振环的双端口测试平台实物图
Figure 3. Physical diagram of the resonant ring-based dual-port test platform
图 6 矩形软波导结构尺寸示意图
Figure 6. Schematic dimensions of rectangular flexible waveguide structure
图 7 矩形软波导工作频带内传输系数仿真曲线
Figure 7. Simulation curves of transmission coefficients in the operating band of rectangular flexible waveguide
图 9 140 kW驻波测试时两款软波导热分布对比
Figure 9. Comparison of heat distribution of two flexible waveguides at 140 kW standing wave test
表 1 待测软波导
Table 1. Flexible waveguide under test
material manufacturing location max. temperature rise (46 kW)/℃ max. temperature rise (138 kW)/℃ copper domestic 9.7 18.5 copper domestic 8.2 17.5 aluminum domestic 6.5 16.8 aluminum foreign 4.8 11.3 
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表 2 待测器件
Table 2. Flexible waveguide under test
material manufacturing location max. temperature rise (50 kW)/℃ max. temperature rise (140 kW)/℃ copper domestic 10.7 20.2 aluminum domestic 4.3 9.4 aluminum foreign 5.3 10.7
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