Field patterns and Poynting vectors of TM 01 mode in sinusoidally corrugated waveguides are analyzed numerically.It is shown that a plasma column near the axis excludes the rf electric field lines towards the peripheral region, resulting in increased Poynting vectors in the axial direction there. The excitation of TM 01 mode in corrugated waveguides is shown to be classified into two cases; surface and the volume waves. A possible physical explanation for the enhanced radiation observed previously from plasma filled backward wave oscillators is tried from the present results.
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Ogura et al. (1992) studied this question.
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