Title :
A high-efficiency 59- to 64-GHz TWT for intersatellite communications
Author :
Wilson, J.D. ; Ramins, P. ; Force, D.A. ; Limburg, H.C. ; Tammaru, I.
Author_Institution :
NASA Lewis Res. Center, Cleveland, OH, USA
Abstract :
The design of a 75-W, 59-64 GHz TWT (traveling wave tube) with a predicted overall efficiency in excess of 40% is described. This intersatellite communications TWT, designated the Hughes Aircraft Company Model 961HA, uses a coupled-cavity slow-wave structure with a two-step velocity taper and an isotropic graphite multistage depressed collector (MDC). Because of the RF efficiency of this TWT is less than 8%, an MDC design providing a very high collector efficiency was necessary to achieve the overall efficiency goal of 40%. Measurements indicated a very high MDC efficiency of 93.9%, very close to the computed value.<>
Keywords :
microwave amplifiers; travelling-wave-tubes; 40 percent; 59 to 64 GHz; 75 W; EHF; Hughes Aircraft Company; MDC; Model 961HA; TWT; coupled-cavity; design; efficiency; high collector efficiency; intersatellite communications; isotropic graphite multistage depressed collector; slow-wave structure; traveling wave tube; two-step velocity taper; Anodes; Bandwidth; Cathodes; Circuits; Electrons; Fabrication; NASA; Power generation; Radio frequency; Voltage;
Conference_Titel :
Electron Devices Meeting, 1991. IEDM '91. Technical Digest., International
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-0243-5
DOI :
10.1109/IEDM.1991.235402
