A Study on the Characteristics of a 400W, 7.9～8.4GHz Double-Slot Coupled-Cavity Traveling-Wave Tube

This thesis focuses on the study of high-power, coupled-cavity traveling-wave tube(CCTWT) for radar applications. The CCTWT employed a reentrant double-slot staggered RF cavity structure. Computational analysis of the X-band, double-slot staggered structures is carried out through the use of HFSS code, which solves Maxwell's equations fully in three-dimensions. The non-linear, large-signal performance of CCTWTs are predicted from numerical simulations using a three-dimensional particle-in-cell code, MAGIC3D. With beam voltage set to 12.7～13kV and beam current at 300mA, the CCTWT produces a saturated radiation power of 350～430W, corresponding to an electronic efficiency of 8.9～11.2 % and a gain of 23.7～24.2dB within a frequency range o