Abstract
Recent studies have shown that modes not of the circular electric type have low-loss characteristics in dielectric lined circular waveguide. It was determined that circular electric modes are low-loss for linings approximately 0, λ/2, λ, · · · wavelengths thick while circular magnetic modes are low-loss for λ/4, 3λ/4, · · · thick linings. In this paper we derive a simple relationship between the loss characteristics of circular electric waves with 0, λ/2, · · · thick linings and circular magnetic waves with λ/4, 3λ/4, · · · thick linings. Specifically, we show that the minimum obtainable circular magnetic mode loss is at least four times greater than the minimum obtainable circular electric mode loss. We also show that the minimum loss for successively higher order circular electric (magnetic) modes corresponding to approximately 0, λ/2, · · · (λ/4, 3λ/4, · · ·) thick linings is approximately the same if we neglect the dielectric losses.
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