Abstract
Abstract A means is described to increase the on-axis component of the far-field energy pattern of radiation emitted from the open end of a circular waveguide containing a high order TE1n gyrotron mode. While the sidelobe power is higher than that of some other approaches, this technique is relatively broadband and compact, and should be easy to fabricate. The method uses a phase-plate at the output of the waveguide to rectify the negative portion(s) of the electric field of the circular TE mode in the waveguide.
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