Theory and measurement for a dual-shaped reflector antenna for a whispering-gallery-mode gyrotron

A dual-shaped dual-reflector synthesis technique is applied to the design of a reflector antenna system for transforming the output of a whispering-gallery-mode gyrotron to a focused Gaussian free-space beam. Numerical and measured results of the synthesis are presented. The synthesis routine developed yields excellent results when analyzed using ray tracing. Diffraction calculations indicate that undesired output field structure can be nearly eliminated by modifying the radiation pattern of the primary radiator.<>