A Carbon Nanotube-based Hundred Watt-level Ka-band Backward Wave Oscillator

Xuesong Yuan, Qingyun Chen, Xiaotao Xu, Matthew Cole, Yu Zhang, Zexiang Chen, Yang Yan

Research output: Contribution to journalArticlepeer-review

Abstract

Carbon nanotube (CNT) cold-cathodes hold much promise in a variety of millimeter-wave and terahertz vacuum electronic radiation devices due to their inherent near instantaneous temporal turn-on and near-ideal ideal field electron emission performance. Here we report on the development of a CNT cold-cathode Ka -band backward-wave oscillator (BWO). Using a novel beam compression stage, theoretical studies, simulation results, and empirical findings collectively demonstrate that this device affords an unprecedentedly high output power of 230 W at a technologically important operating frequency of 33.65 GHz. The developed magnetic injection electron gun achieves a high emission current of 265.5 mA (emission current density of 188.3 mA/cm 2 ) and a high focused beam current density of 18.5 A/cm 2 , which our studies suggest, is essential to the BWOs high output power.
Original languageEnglish
Pages (from-to)2467 - 2472
Number of pages6
JournalIEEE Transactions on Electron Devices
Volume68
Issue number5
Early online date29 Mar 2021
DOIs
Publication statusPublished - 31 May 2021

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