4.6 Article

Power Enhancement in W-Band Pulsed Folded Waveguide TWT

期刊

IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 68, 期 5, 页码 2504-2508

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2021.3068692

关键词

Folded waveguide (FWG); phase velocity tapering (PVT); traveling-wave tube (TWT); W-band

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The study introduces a modified folded waveguide structure to enhance the power output of W-band traveling-wave tubes, utilizing phase velocity tapering technology and high beam current to achieve higher output power and electronic efficiency.
To obtain higher power in W-band traveling-wave tubes (TWTs), a modified folded waveguide (FWG) with non-concentric bends is introduced and demonstrated, which has higher coupling impedance compared with the normal FWG structure and is utilized to eliminate the band-edge instability of TWT. Phase velocity tapering (PVT) is also used to improve the interaction efficiency between the beam and the circuit. Furthermore, a higher beam current is used and the corresponding magnetic focusing system is designed to confine the beam. A prototype tube was then fabricated and tested at a beam current of 220 mA and beam voltage of 21.9 kV. The testing data show that this W-band TWT is capable of delivering an output power of over 450 W with a 4.5-GHz bandwidth at a duty cycle of 10%, with a maximum power of 647 W and electronic efficiency of 13.4%. That is the highest output power and electronic efficiency test results of W-band TWTs reported so far.

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