Electrodynamic Characteristics of Promising Energy Outputs of W-band High-Power Vacuum Microwave Devices

The results of studying electrodynamic characteristics (EDC) of vacuum-tight energy outputs, intended for operation in W-band high-power electrovacuum devices (EVD) are presented. The designs of a pillbox window are considered, in which the formation of an electric field on the surface of a ceramic disk is realized by TE11, TM11 wave types of a round waveguide and the Brewster window, which is a segment of a rectangular waveguide with standard cross-section and an inclined ceramic diaphragm. In the outputs under study the use of ceramics based on oxides of aluminum, beryllium, as well as polycrystalline boron nitride and diamond was considered as a vacuum-tight dielectric diaphragm. A comparison is made of the operating frequency band and losses of the considered vacuum-tight energy output designs when using various dielectrics. On the basis of the obtained EDC, recommendations are given for the choice of ceramics for high-power microwave EVDs.