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Design of High-Efficiency Ka/Q Dual-Band Millimeter-Wave Helix Traveling Wave Tube Slow Wave Structure
Pages: 1234-1240
Year: Issue:  11
Journal: Vacuum Science and Technology

Keyword:  TWTHigh frequency characteristicsHigh efficiencyDual-bandBeam-wave interaction;
Abstract: Vane loading was analyzed through simulation calculation,whose depth and angle may have influences on the dispersion and interaction impedance. After optimization of high frequency circuit,helix TWT slowwave structure which satisfies both Ka-band and Q-band was initially designed. In order to improve the efficiency of beam-wave interaction,the structure of pitch step and pitch taper was applied,moreover,one groove was used where was the output of phase velocity increasing. Using 3-D electromagnetic field software MTSS,TWT’s beam-wave interaction was simulated,this tube after optimization can produce output power over 407 W from 33 to 36 GHz,electronic efficiency is more than 22. 36%,and gain is greater than 48. 32 d B. As well as from 43. 5 to 46. 5GHz the output power is over 266 W,electronic efficiency is more than 15. 86%,and the gain is greater than44. 06 d B.
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