Abstract
A lack of compact, powerful, and efficient sources in the submillimeter-wave or terahertz-regime of frequencies has motivated research of microfabricated vacuum electronic devices. Regenerative-feedback traveling wave tube (TWT) oscillators have been proposed as a candidate source [1]. Recently, a compact TWT oscillator was fabricated and demonstrated with an intrinsic efficiency of ∼ 0.34% at 638 GHz [2]. This device utilized a folded waveguide structure as the slow wave circuit. By continuous variation of the beam voltage, the operating frequency was varied between 607 – 675 GHz. However, the oscillation frequency exhibited a step-tuning behavior, rather than a smooth variation with beam voltage.
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