Design And Optimization Of W-Band Extended Interacting Oscillator

Compared with traditional klystrons,traveling wave tubes,magnetrons and other devices,extended interaction oscillators can achieve greater output power in the millimeter-wave and terahertz bands.Because of its small size and compact structure,it is widely used in radar,electronic countermeasures,aerospace and other fields.Focuses on the subject of note-wave interaction,taking the W-band extended interaction oscillator as an example,the work of theoretical simulation,numerical calculation and simulation analysis is carried out:1.Based on the one-dimensional electronic disc model,from the view of kinematics point,which the space charge between the electronic discs was considered,a basic theoretical model for the extended interaction oscillator was formed to analyze the initial phase,the number of cycles,the operating current,the modulation factor,the length of the cycle of the W-band extended interaction oscillator on the electronic conversion efficiency.2.Based on the basic principle of energy conservation and the one-dimensional disk beam-wave interaction equation,combined with the characteristic impedance of the coupling cavity and the exterior quality factor,a self-consistent nonlinear theoretical model for the extended interaction oscillator was obtained,and the influence of the change of operating parameters on the output power and efficiency of the extended interaction oscillator is analyzed.The results show that the operating voltage,current and exterior quality factors not only affect the output power of the extended interaction oscillator,but also are the key factors affecting whether the oscillator starts.3.Based on the theoretical analysis of extended interaction oscillators and the parameters obtained by numerical simulation,simulations of the W-band 95GHz cylindrical beam-spreading extended interaction oscillator were performed in the CST simulation software.The final experiment shows that the W-band 9-gap extended interaction oscillator has a period length of 0.79mm,operating frequency of 94.18GHz,working voltage and current of 19kV and 0.4A,output power of 1020W,and electron conversion efficiency of 13.42%.This shows that the cavity performance is good and meet the design requirements,and the self-consistent nonlinear simulation written in C++ language obtains an output power of 1130w and an electronic conversion efficiency of 14.86%,with an error of about 10%.It verifies the effectiveness of the program and provides a reference for the development and design of microwave devices.