翼片加载螺旋带慢波结构的损耗特性
Loss characteristics of the vaneloaded helical slowwave structures
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摘要: 因为金属不可能具有理想的导电性能，慢波系统的损耗总是存在的，因此衰减常数是衡量一个慢波系统优劣的重要参数之一。考虑螺旋带径向厚度，对介质进行分层，取不同的径向相位常数对翼片加载螺旋线慢波结构建立了螺旋带模型，详细推导了衰减常数表达式。计算结果表明，考虑螺旋带径向厚度将提高衰减常数的计算值，螺旋线本身的损耗占整个系统损耗的大部分。Abstract: In this paper, with the consideration of the radial thickness of the helix, the tape helix model is suggested for the vaneloaded helical slowwave structures. By taking the sicretesupports bars into some continuous dielectric tube regions, the expressions of attenuation constant are obtained. The effect on loss of the envelope, the vane and the helix material conductivity are all taken into account. This model can increase the calculated value of the attenuation constant. The results indicate that the loss of the helix occupies most of the whole loss.
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Key words:
- tape helix /
- slowwave structure /
- twt /
- loss characteristics
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