幅相一致行波管高频电路CAD研究

Simulation of slow wave circuit in TWT for phase and gain matched operation

在行波管的设计和装配过程中,各部件的尺寸必须严格控制,高频电路参数的离散对行波管色散特性有极大的影响。使用螺旋导电面模型,模拟计算了高频结构各主要参数离散对色散特性和轴向互作用耦合阻抗的影响。分析计算了夹持杆宽度、翼片高度、螺旋线平均半径、螺距、夹持杆介电常数等离散时对色散特性和轴向互作用耦合阻抗的影响,为新型幅相一致行波管的设计和生产提供了很有价值的参考建议。

Designing an octave bandwidth helical traveling wave tube for phase and gain matched operation in the EHF region presents many obstacles, the dimensional controls must be imposed in the design. A code is programmed based on the sheath model. In the sheath model the helix is approximated by a helically conducting cylindrical surface of negligible thickness. The code is used to determine the effect on dispersion and on-axis interaction impedance of several helical slow-wave circuit parameter variations, including thickness and relative dielectric constant of the support rods, pitch width, height of the metal vane and helix average radius. The specific results can serve as a general guide for similar devices, and the computational techniques are readily applicable to other TWTs.