期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 57, 期 5, 页码 1152-1159出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2010.2043178
关键词
Beam voltage; folded waveguide (FWG); helix; regenerative feedback oscillator; step tuning; terahertz (THz); traveling-wave tube (TWT)
资金
- U.S. Air Force Office of Scientific Research
- China Scholarship Council
A lack of compact, powerful, and efficient sources in the submillimeter-wave or terahertz (THz) frequency regime (similar to 300-3000 GHz) has motivated the research on microfabricated vacuum electronic devices. Regenerative feedback traveling-wave tube (TWT) oscillators have been proposed and validated as good candidate sources of THz-regime radiation. Recently, a microfabricated folded-waveguide (FWG) TWT oscillator has demonstrated a peak output power of 50 mW at 656 GHz with an intrinsic circuit efficiency of 0.45%. By continuous variation of the beam voltage, the operating frequency was varied between 607 and 675 GHz. However, the oscillation frequency exhibited a step-tuning behavior, rather than a smooth variation with beam voltage. It is hypothesized that this step tuning results from a combination of the TWT gain characteristics and a phase self-consistency condition. To confirm this hypothesis, we theoretically model a 40-GHz FWG-TWT oscillator and experimentally study a 5-GHz helix-TWT oscillator. The FWG-TWT results exhibit an inclined step-tuning characteristic, similar to previously unreported observations on a 650-GHz THz-regime oscillator. Similar characteristics are also observed, along with multifrequency oscillations, in the helix-TWT experiments.
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