新型自由矩形螺旋线慢波结构高频特性
High-frequency characteristics of free rectangular helical slow-wave structure
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摘要: 在Sheath模型下,采用严格的场匹配法,结合积分形式的边界条件，推导了自由矩形螺旋线的色散方程和耦合阻抗表达式，并与近似理论进行对比。结果表明:与近似理论相比, 严禁场匹配法具有更高的准确性,且采用场匹配法的数值计算结果与3维商业电磁仿真软件结果吻合得很好。从而证明了所采用理论方法的有效性。同时分析了矩形螺旋线横截面尺寸、螺距、螺旋角、纵横比对色散特性和耦合阻抗的影响，结果表明：只有当矩形螺旋线横截面纵横比大于4时，才可忽略横截面的宽度对高频特性的影响，通过调节结构的参数可以改善色散和提高耦合阻抗。Abstract: Based on sheath model, high-frequency characteristics including dispersion properties and coupling impedance of rectangular helix structure are derived by using field-matching method combining with integral boundary conditions. The numerical results, which are generally based on approximation approach, agree well with the results obtained by three-dimensional electromagnetic simulation software. Only when the aspect ratio of rectangular cross-section is larger than 4, the influence of the section width on the high-frequency characteristics can be neglected. Moreover, changing the pitch and dimensions of rectangular cross-section can improve the dispersion characteristics and the coupling impedance.
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