High-frequency characteristics of half rectangular ring helix slow wave structure
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摘要: 针对行波管更高工作频率和更大输出功率的发展需要，提出了一种半矩形环螺旋线慢波结构。基于三维电磁仿真软件HFSS的模拟研究表明：调控慢波结构的尺寸可以获得合适的色散特性和互作用阻抗，与现有技术的半圆环螺旋线慢波结构相比较，半矩形环螺旋线慢波结构的色散变化很小，但是具有更高的互作用阻抗值。新结构具有平坦色散、高互作用阻抗、与微细加工技术相兼容以及方便与带状电子束互作用的综合优点。
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关键词:
- 半矩形环螺旋线慢波结构 /
- 微细加工技术 /
- 带状电子束 /
- 色散特性 /
- 互作用阻抗
Abstract: A novel half rectangular-ring helix slow-wave structure (SWS) is proposed for the design of wide bandwidth and high power traveling-wave tubes. The numerical calculation by 3D electromagnetic simulation software HFSS shows that proper dispersion and coupling impedance can be obtained by reasonably setting the geometrical parameters of the SWS. Meanwhile, compared with the half circular ring helix slow wave structure, slight variation in dispersion and remarkable improvement in coupling impedance have been observed in the numerical calculation of the half rectangular ring helix SWS. The half rectangular-ring helix slow-wave structure has the combined advantages of flatten dispersion, high interaction impedance, easy fabrication and convenience for interaction with sheet beam. -
图 1 半圆环螺旋线慢波结构和半矩形环螺旋线慢波结构模型图
Figure 1. Model of half circular ring helix slow wave structure and half rectangular ring helix slow-wave structure
图 2 半矩形环螺旋线厚度t对慢波结构高频特性的影响，参数（单位：mm）：b/a＝2, a＝0.10, w＝0.06, p＝0.20, c＝1.00, d＝1.00
Figure 2. Effect of helix thickness on high-frequency characteristics with parameters of (in mm) b/a＝2, a＝0.10, w＝0.06, p＝0.20, c＝1.00, d＝1.00
图 3 半矩形环螺旋线宽度w对慢波结构高频特性的影响，参数（单位：mm）: b/a＝2, a＝0.10, t＝0.01, p＝0.20, c＝1.00, d＝1.00
Figure 3. Effect of helix width w on high-frequency characteristics with parameters of (in mm) b/a＝2, a＝0.10, t＝0.01, p＝0.20, c＝1.00, d＝1.00
图 4 半矩形环螺旋线高度b对慢波结构高频特性的影响，参数（单位：mm）a＝0.10, t＝0.03, w＝0.06, p＝0.20, c＝1.00, d＝1.00
Figure 4. Effect of the height b on high-frequency characteristics with parameters of (in mm) a＝0.10, t＝0.03, w＝0.06, p＝0.20, c＝1.00, d＝1.00
图 5 慢波结构周期对系统高频特性的影响参数，（单位：mm）：a＝0.10, b/a＝2, t＝0.01, w＝0.06, c＝1.00, d＝1.00
Figure 5. Effect of the axial period on high-frequency characteristics with parameters of (in mm) a＝0.10, b/a＝2, t＝0.01, w＝0.06, c＝1.00, d＝1.00
图 6 半矩形环螺旋线宽高比对系统高频特性的影响，参数（单位：mm）4a＋4b＝1.22, t＝0.03, w＝0.06, p＝0.20, c＝1.00, d＝1.00
Figure 6. Effect of aspect ratio on high-frequency characteristics with parameters of (in mm) 4a＋4b＝1.22, t＝0.03, w＝0.06, p＝0.20, c＝1.00, d＝1.00
图 7 半矩形环螺旋线和相同结构参数的半圆环螺旋线高频特性对比
Figure 7. Comparison of high frequency characteristics between the half circular ring helix slow wave structure and the half rectangular ring helix slow wave structure
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