8 mm回旋行波管和返波管的三折螺旋波纹波导色散分析

 三折螺旋波纹波导使TE11模和TE21模相互耦合，其色散曲线能够在宽频带内与电子回旋共振，因此需要对色散方程进行研究。提出了适合工程实用的行波模式和返波模式的色散方程，并对方程中的耦合系数进行了简化，误差在1%左右。利用CST软件的VBA语言对螺旋波纹波导进行建模和计算，根据模拟得到的传输特性曲线的特点，提出一种模拟方法，将模拟与理论计算得到的色散曲线作对比，误差在5%左右。

Dispersion analysis of three-fold helical rippled waveguide for 8 mm gyro-TWT and gyro-BWO

Three-fold helical rippled waveguide makes TE_(11) and TE_(21) coupling,the dispersion characteristic in physical mechanism make the electron the cyclotron resonance in the broad frequency band,so the dispersion equation need to be researched.The dispersion equation of the traveling wave mode and backward wave mode are put forward for the engineering application.The coupling coefficient of the dispersion equation is simplified,whose error is about 1%.The model is built and the helical rippled waveguide is simulated using VBA program in CST software.A simulation method is put forward by the coupling mode characteristic in the simulated transmission characteristic curve.The simulation result is compared with the theoretical one and the error is about 5%.The simulation method and theory in the paper are fit for design of the gyro-TWT and gyro-BWO.