期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 69, 期 5, 页码 2631-2636出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3159286
关键词
3-stage folded-waveguide (FWG) traveling wave tube (TWT); cutoff region; gain equalization; wide bandwidth
资金
- National Natural Science Foundation of China [61371052, 61921002, 92163204, 61988102]
- China Scholarship Council (Western Plan)
This article proposes a novel technique called 3-stage gain equalization technique (GET) to address the gain fluctuation and bandwidth limitation in folded-waveguide traveling-wave tubes (FWG-TWTs). The GET improves gain at high frequency and decreases gain at low frequency to achieve gain equalization and extend bandwidth. Compared with traditional TWTs, the 3-stage FWG-TWT achieves significant improvement in gain flatness and bandwidth.
With demanding applications in high-data-rate communication, a folded-waveguide (FWG) traveling-wave tube (TWT) faces the challenge of gain fluctuation and bandwidth limitation. To flatten gain and extend bandwidth, a novel 3-stage gain equalization technique (GET) is proposed and applied in FWG-TWT in this article. This technique shifts the operating point to a high-frequency range in the middle section. Gain equalization can be implemented by improving gain at high frequency and decreasing gain at low frequency. Furthermore, the GET also has a significant advantage in extending bandwidth. Accordingly, a 3-stage FWG-TWT is realized. Compared with a Q-band FWG-TWT with a uniform slow-wave structure (SWS), the 3-stage FWGTWT extends the 3-dB bandwidth by more than similar to 45% and the gain variation less than 0.3 dB in the operating bandwidth, which demonstrates great improvement.
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