Investigation on multipactor of high-power microwave window with grooves

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.