Title :
Design of a Q-band traveling-wave-tube amplifier
Author :
Na, Young Ho ; Jung, Sang Wook ; Choi, Jin J. ; Kim, Roy
Author_Institution :
Sch. of Electron. Eng., Kwangwoon Univ., Seoul, South Korea
Abstract :
Summary form only given. Design of a Q-band travelling-wave tube amplifier is presented in this paper. Two types of slow wave circuit with folded-waveguide type and helix type are examined in the traveling-wave-tube amplifier. A 3D particle-in-cell code (MAGIC3D), a 3D electromagnetic code (HFSS) and Pierce theory are used in the amplifier design. A highly reproducible, low cost folded-waveguide traveling-wave-tube amplifier is designed to operate at 40-48 GHz with a peak output radiation power of 200 W. Initial circuit parameters are obtained from the Pierce theory and circuit dispersion relations. A non-linear, large-signal performance of the amplifier is predicted from the 3D particle-in-cell simulation. A simulation model of the two stage serpentine circuit is shown. The non-linear numerical simulations predict an electronic efficiency of 5.6%, corresponding to a saturated radiation power 200 W at 44 GHz where the beam voltage is 21 W and the beam current is 0.17 A. The saturated 3-dB bandwidth is found to be 16% (40.5-47.5 GHz). A design of a Q-band helix traveling-wave-tube amplifier is underway.
Keywords :
dispersion relations; electromagnetic field theory; electron guns; electronic design automation; millimetre wave amplifiers; numerical analysis; slow wave structures; travelling wave amplifiers; 0.17 A; 200 W; 21 W; 40 to 48 GHz; 40.5 to 47.5 GHz; 5.6 percent; HFSS 3D electromagnetic code; MAGIC3D particle-in-cell code; Pierce theory; Q-band helix traveling-wave-tube amplifier; Q-band traveling-wave-tube amplifier design; amplifier design; beam current; beam voltage; circuit dispersion relations; circuit parameters; electronic efficiency; folded-waveguide traveling-wave-tube amplifier; folded-waveguide type slow wave circuit; helix type slow wave circuit; nonlinear large-signal performance; nonlinear numerical simulations; peak output radiation power; saturated radiation power; simulation model; two stage serpentine circuit; Bandwidth; Circuit simulation; Costs; Design engineering; Dispersion; Electromagnetic radiation; Electron devices; High power amplifiers; Predictive models; Telecommunications;
Conference_Titel :
Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International
Print_ISBN :
0-7803-7256-5
DOI :
10.1109/IVELEC.2002.999281
