利用MWS设计螺旋线行波管耦合结构

Design of the Couplers for Helix TWT Using MWS

利用CSTMWS仿真软件对螺旋线行波管耦合结构进行设计。首先,利用MWS仿真结果得出同轴线与螺旋线慢波结构连接部分的反射系数;接着,对高频窗进行了设计与优化;最后,计算出整个耦合结构可能产生的最大驻波系数小于2.0。对比理论值与冷测试数据表明,实测值小于理论计算的最大驻波系数。因此,在螺旋线行波管耦合结构的设计过程中,通过对驻波系数最大值的控制,可以满足实际工程的要求。

The coupler of helix TWT （traveling-wave tube） is designed by using CST MWS. Firstly, the reflection of the connection between coaxial cable and the helical SWS （slow wave structure） is got based on the simulation result; then, the RF window is designed and optimized; finally, the possibly maximum VSWR of the couplers which is smaller than 2. 0 is calculated in theory. Compared the result in theory with that in the cold test, it indicates that the experiment ＇ s result is less than the possibly maximum VSWR. So, the couplers of helix TWT designed by controlling the maximum VSWR can be satisfied with the request of the actual project.