螺旋线厚度对螺旋线慢波结构高频特性的影响

摘要

Based on the helical coordinate system, using the approximate field matching method, we studied the high-frequency characteristics of thicker helical slow wave structure, obtained the dispersion equation, and analyzed the influence of the thickness of the helix slow wave on the phase velocity. The results show that the dispersion curve of the slow-wave structure becomes flat with the increase of helix thickness, and also the dispersion becomes weaker, the bandwidth broadens. The calculation results of our method agree well with the results obtained by CST simulation, which proves that the theoretical method has a higher accuracy than the Hook's model in analysis of the thicker helix.%在螺旋坐标系下采用近似场匹配法研究了厚度较厚的螺旋线慢波结构的高频特性,得到了其色散方程,并数值计算了螺旋线厚度对慢波系统的相速的影响.结果表明:随螺旋线厚度的增加,慢波结构的色散曲线变得平坦,色散变弱,带宽增加.与软件仿真结果及Hook的螺旋线模型对比表明:采用近似场匹配法的计算结果与CST仿真吻合得更好,比Hook模型具有更高的准确性,从而证明所采用理论方法的有效性.