caa a22 4500 477123171 CHVBK 20180405111642.0 cr unu---uuuuu 170330e19970601xx s 000 0 eng 10.1007/BF02678236 doi (NATIONALLICENCE)springer-10.1007/BF02678236 Liu Shunkang Department of Electronic Engineering, Southeast University, 210018, Nanjing, People's Republic of China aut Design of a tapered helix for suppressing backward wave oscillations in MMW TWT's [Elektronische Daten] [Shunkang Liu] Backward wave oscillations are easy occurred in high power helix millimeter wave traveling wave tubes (MMW TWT's), owing to larger ka value and higher operating voltage. The start current of backward wave is calculated for helix TWT in Ka band. It is shown that start current will increase by used a tapered helix. Backward wave oscillations can be suppressed in tube. The design method of the tapered helix is given in this paper. Plenum Publishing Corporation, 1997 International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/6(1997-06-01), 1317-1321 0195-9271 18:6<1317 1997 18 10762 https://doi.org/10.1007/BF02678236 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02678236 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Liu Shunkang Department of Electronic Engineering, Southeast University, 210018, Nanjing, People's Republic of China aut NATIONALLICENCE 773 0- International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/6(1997-06-01), 1317-1321 0195-9271 18:6<1317 1997 18 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer