Abstract
Recent studies of the heat loss characteristics of the normal modes in dielectric lined circular waveguide have shown that modes other than those of the circular electric type may have low loss over wide frequency bands. This unexpected behavior of the mode loss characteristics is explained by utilizing the well-known duality relationships between the electric and magnetic fields. Specifically, it is shown that the lowest loss modes are alternately circular electric and circular magnetic as frequency (or lining thickness) increases, with low loss occurring at frequencies and lining thickness where the wall impedance of the dielectric coated guide approximates a short circuit (or electric wall) for circular electric modes, and an open circuit (or magnetic wall) for circular magnetic modes. These findings will influence and aid in the selection and design of an appropriate waveguide(s) (employing the circular electric TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> mode) for the WTS millimeter wave transmission system which is presently under development; they may also influence the design of future guided wave systems.
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