A new type of the small-sized double-gap multi-beam klystron resonator based on Greek-cross fractal geometry

The paper presents results of modeling parameters of the compact double-gap resonator for 19-beam klystron type devices with a resonant fractal structure of the Greek-cross type for “0-th”, “1-st” and “2-nd” iteration. Resonance elements made on the central electrodes of a symmetrical high-Q strip line suspended on a diamond dielectric substrate. The resonator has two fundamental modes of oscillation: in-phase and anti-phase. The main mode of the oscillations of the resonator is anti-phase. It corresponds to the X-range of frequencies used in satellite communications. The first higher oscillation mode (in-phase) corresponds to the Ku-band. The optimal parameters of the interaction process are found.