| Abstract: | A novel slotted helix slow-wave structure(SWS) is proposed to develop a high power,wide-bandwidth,and high reliability millimeter-wave traveling-wave tube(TWT).This novel structure,which has higher heat capacity than a conventional helix SWS,evolves from conventional helix SWS with three parallel rows of rectangular slots made in the outside of the helix tape.In this paper,the electromagnetic characteristics and the beam-wave interaction of this novel structure operating in the Ka-band are investigated.From our calculations,when the designed beam voltage and beam current are set to be 18.45 kV and 0.2 A,respectively,this novel circuit can produce over 700-W average output power in a frequency range from 27.5 GHz to 32.5 GHz,and the corresponding conversion efficiency values vary from 19% to 21.3%,and the maximum output power is 787 W at 30 GHz. |
