High-frequency Structure And Energy Couplers Of A W-band Sheet Beam EIK

Klystron is a high-power microwave device, which has advantages of high gain, high-power output and operating frequency stability. In the 1960 s, Klystron is one of the most widely-used high-power devices. To achieve microwave amplification at high-operating frequency, Klystron transforms the energy of electron beam to the field by modulating speed and density of electron. In the past several decades, the improvement of Klystron performance was promoted by the rapid development of electronic technology and increasing needs of national defense. In the 1950 s, the concept of Extended Interaction Klystron was proposed by M. Chodorow and T. Wessel-Berg at first. Extended Interaction Klystron, which could obtain high-output power, high efficiency and wide bandwidth at the high-operating frequency, was based on the theory of Klystron and slow-wave structure. Compared to other vacuum devices, Extended Interaction Klystron meets the requirements of integrated development. The research of Extended Interaction Klystron has very significant implications for the application and development of high-power equipment, especially national information construction.Firstly, the summary about the generation and development of Klystron are introduced. Then the velocity modulation principle, density modulation principle and energy exchange theory are theoretical summarized. At last, utilizing the basic characteristics of resonator and coupling principles of a high-frequency field, high-frequency structures and transmission structure of W-band Extended Interaction Klystron are theoretical analyzed and simulated in this paper.This paper gives theoretical, numerical and software research on the W-band extended interaction resonator and energy couplers. Several valuable academic achievements are obtained.Firstly, combined with the characteristics of the resonator and slow-wave structure, a high-frequency structure consist of a certain length of shorted rectangular gate double gate is designed. The distribution of field is symmetrical in the resonator using software. Simulation results of the resonator show that operating frequency of extended interaction resonator is 94.74 GHz, the quality factor is 948.38, and the characteristic impedance is 51.8 ?.Secondly, load tuning waveguide, which added to the energy couplers, is easy to adjust distribution of high frequency field. The outside quality factor is calculated by obtaining group delayed of the output resonant cavity. The bandwidth of 2? mode of output structure is 0.50 GHz.At last, the breakdown and multi-mode resonator competition issues are analyzed. The results of simulation show the value of field does not exceed the breakdown threshold in the resonator, and 2? mode is not affected by other modes in the structure of output.