Ho1 Mode Circular Waveguide Components

A convenient method of launching the H_o1 mode in round waveguide is described. Four resonant slots are employed in a compact end-feed transition design. Construction details and performance curves are given. Also described is a developmental bend which avoids the H_o1-E₁₁ mode degeneracy problem by employing a superimposed pair of "E" and "H" plane rectangular waveguide bends. A mode absorber is described which is capable of reducing the mode impurities inherent in the transition design to a level of less than 0.1% of the emerging H_o1 mode power. Other possible applications of the H_o1 wave to problems other than low loss microwave transmission are briefly considered.