C波段小型化高功率微波输出窗的设计  

Design and research of C-band miniaturized high powermicrowave output window

作　　者：卯鹏新 唐永亮 王秀芳 刘庆想[1] Mao Pengxin;Tang Yongliang;Wang Xiufang;Liu Qingxiang(School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院,成都610031

出　　处：《强激光与粒子束》2024年第3期46-52,共7页High Power Laser and Particle Beams

基　　金：高功率微波技术创新工作站开放课题。

摘　　要：为了满足高功率微波系统对微波输出窗高功率容量和紧凑化的应用需求,以传统盒型窗的设计理论为基础,通过优化窗体结构和添加过渡段等手段,设计了一种C波段小型化高功率微波输出窗。通过增大窗体表面积、改变矩形波导-圆波导过渡段的连接方式可提高功率容量并缩小微波输出窗的纵向尺寸;采用“I”型的窗体结构可有效抑制三相点(真空-介质-金属)附近的次级电子倍增效应对输出窗性能的影响。在电磁仿真的基础上采用粒子模拟(Particle-in-Cell)的方法研究了微波输出窗三相点附近的次级电子倍增效应,从微观角度进一步证实了“I”型窗体结构可使三相点位置发生移动,减小三相点发射的电子在窗片表面产生次级电子倍增效应的概率,降低微波输出窗的击穿风险。设计结果表明,微波输出窗在中心频点处的主模反射系数低于0.01,传输效率高于99.9%,功率容量可达47.9 MW。To meet the high power capacity and compact application requirements of microwave output window in high power microwave system,a C-band miniaturized high power microwave output window is designed based on the design theory of traditional box window by optimizing the form structure and adding transition segments.By increasing the surface area of the window and changing the connection mode of the rectangular waveguide-circular waveguide transition segment,the power capacity can be increased and the longitudinal size of the microwave output window can be reduced.The“I”form structure can effectively suppress the influence of multipactor near the triple point(vacuum-media-mental)on the performance of the output window.On the basis of electromagnetic simulation,the multipactor near the triple point of the microwave output window is studied by using the Particle-in-Cell method.From the microscopic point of view,it is further confirmed that the“I”form structure can make the position of the triple point move,reduce the probability of multipactor generated by the electrons emitted by the triple point on the surface of the window,and reduce the breakdown risk of the microwave output window.The design results show that the main mode reflection coefficient of the microwave output window at the center frequency is lower than 0.01,the transmission efficiency is higher than 99.9%,and the power capacity can reach 47.9 MW.

关 键 词：高功率微波 输出窗 小型化 功率容量 三相点 次级电子倍增效应 

分 类 号：TM21[一般工业技术—材料科学与工程]