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In this paper, the electromagnetic properties of a beam free trapezoidally corrugated slow wave structure (TCSWS) are numerically and experimentally investigated. The dimensions of the TCSWS are selected so that it can be deployed in $X$ -band backward wave oscillators (BWOs). The theoretical dispersion characteristics for the axisymmetric ${\rm TM}_{01}\hbox{--}{\rm TM}_{03}$ modes are obtained...
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