A two-frequency compact klystron three-gap resonator with a suspended dielectric substrate

This article presents the design of a two-frequency small-sized three-gap rectangular resonator with a suspended dielectric substrate for a low-voltage amplifying klystron C and X wavelength range. Its main electrodynamic and electronic parameters were calculated for anti-phased (4.7 GHz) and in-phased (9.67 GHz) modes of oscillation. The analysis of the HF electric field along the interaction space was carried out for each of the modes. The three-gap rectangular resonator can be tuned to multiples resonant frequency, which makes it possible to operate as a frequency multiplier. Electronic parameters were calculated for the frequency multiplicity mode also. Calculations show the possibility of obtaining an output power of about 1 kW in a klystron with this resonator at an efficiency of about 60% and an accelerating voltage of 2.6 kV. The three-gap resonator can be used in miniature multi-beam centimeter and millimeter-wave klystrons operating in the mode of an amplifier or frequency multiplier.