从理论上分析了周期性矩形刻槽对喇叭天线输出窗真空侧次级电子倍增的影响。采用动力学方法分析得到电子沿介质窗表面运动的渡越时间和碰撞能量, 验证得到一定尺寸的矩形刻槽介质窗可以有效抑制次级电子倍增效应。在此情况下, 对比了刻槽和不刻槽两种输出窗的辐射特性, 发现周期2 mm、宽度1 mm、深度1 mm的矩形刻槽对介质窗辐射特性的影响可以忽略。

The effect of periodic rectangular grooves on output window multipactor of horn antennas is analyzed theoretically. Dynamic calculation is applied to the research of the electron transit time and collision energy under groove surface. It is found that dielectric window with suitable grooves can effectively suppress the emission of secondary electrons. Using electromagnetic wave simulation software, the radiation pattern and transmission efficiency of the windows with and without the grooves have been investigated. Results show that, for the dielectric window with grooves with 2 mm in period, 1 mm in width, and 1 mm in depth, the influence of the grooves can be neglected.