New types of photonic crystal double-gap resonators for miniature multi-beam short-wave microwave klystrons

Three-dimensional electrodynamics modeling of photonic crystal double-gap resonators intended for miniature multibeam klystrons has been performed. In new resonators, a solid metallic body has been substituted with a grid of metal rods of a similar shape, allowing suppression of parasitic oscillations. Such resonance systems are shown to improve the electrodynamic and weight and size parameters. The alignment conditions of these systems in terms of high-efficiency two-mode interaction with the electron flow have been studied at two frequencies simultaneously, corresponding to the main (anti-phase) and the first higher (in-phase) modes of oscillations.