Title :
Low noise, low phase distortion 120 W K-band TWT
Author :
Komm, D.S. ; Menninger, W.L. ; Robbins, N.R.
Author_Institution :
Boeing Electron Dynamic Devices, Inc., Torrance, CA, USA
Abstract :
Summary form only given. Boeing Electron Dynamic Devices (EDD) has continued the development of a special class of low phase distortion TWTs optimized for digital communications in the 18-21 GHz frequency band. The first of these devices, the model 995H, featured extremely low AM/PM conversion of only 2°/dB. This paper reports the development of a new version, the model 995HA, wherein we have reduced the noise power of the device while continuing to maintain the low phase distortion. The 995HA has a basic electronic efficiency of 18%. Using a multi-stage depressed collector, the TWT has an overall efficiency at saturation of approximately 55%. These low efficiencies are a result of the circuit design trade-offs needed to produce the low phase distortion characteristics.
Keywords :
digital communication; electric distortion; electron device noise; microwave tubes; phase noise; travelling wave tubes; 120 W; 18 percent; 18 to 21 GHz; 55 percent; AM/PM conversion; Boeing Electron Dynamic Devices; K-band TWT; basic electronic efficiency; design trade-offs; device noise power; digital communications; low noise travelling wave tube; low phase distortion TWT; low phase distortion characteristics; model 995HA TWT; multi-stage depressed collector; saturation efficiency; Digital communication; Electrons; Frequency; K-band; Linearity; Noise figure; Noise reduction; Phase distortion; Phase noise; Power system modeling;
Conference_Titel :
Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International
Print_ISBN :
0-7803-7256-5
DOI :
10.1109/IVELEC.2002.999250
