Design of sever for folded waveguide traveling wave tubes

H-plane and E-plane tapered wedge-shaped severs were designed and analyzed by electromagnetic simulation software. The result shows that the matching of the E-plane tapered wedge-shaped sever is better, and the reflected electromagnetic wave mostly results from the place of the centralized electric field, i.e. the sharp end of the wedge-shape for both kinds of severs. A deformed sever is designed based on the E-plane tapered severed. The simulation and experiment results show that, the matching of the deformed sever is much better than that of the H-plane and E-plane tapered wedge-shaped severs near the cut-off frequency.