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Investigation of Staggered Double Grating Slow Wave Structure Loaded by Photonic Crystals

A novel Staggered Double Grating (SDG) slow wave structure (SWS) loaded by photonic crystal for 220GHz traveling wave tube is presented in this paper. Compared with traditional SDG SWS, the novel SWS can form more flat electric field distribution in the transverse direction. The simulation results show the novel SWS is more suitable for sheet electron beam with higher aspect ratio and lower operating voltage at terahertz wave band.