Abstract
Experimental measurements have been carried out to verify the recent theoretical prediction that, in dielectric-lined circular waveguide, modes other than those of the TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</inf> family can exhibit a loss characteristic which decreases with increasing frequency. The TM <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> waveguide was launched in 51-mm diameter circular waveguide lined with a 200-micron layer of polyethylene, and its loss characteristics were measured. Losses of 23 dB/km at 80 GHz and 3.5 dB/km at 110 GHz were measured, thus confirming the decreasing loss with increasing frequency trend predicted by theory.
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