In order to broaden the bandwidth of the Ka-band traveling wave tube (TWT), a novel slow wave structure (SWS) named ridge-loaded symmetrical conformal microstrip meander line (RSCMML) is proposed in this paper. The simulation results indicate that the novel SWS has good transmission characteristics and weak dispersion characteristics. In addition, the beam-wave interaction simulation results show that the maximal output power of the optimized novel TWT is 94 W at the frequency of 34 GHz, the maximum gain and the maximum radio frequency (RF) efficiency are 25.7 dB and 16.1%respectively, and the 3-dB bandwidth can cover the whole Ka-band entirely.
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