%0 Journal Article %T On Prospects of Output Power Increasing in Low-Voltage Multibeam Klystrons for Electron Accelerators %A Galdeckiy, A.V. %K multibeam klystron, metamaterial, phase velocity, annular resonator, dispersion %J Infocommunications and Radio Technologies %D 2022 %N 5 %P 7 %I Federal State Educational Institution of Higher Education Sevastopol State University