Experimental measurements have been carried out to verify the recent theoretical prediction that, in dielectric‐lined circular waveguide, modes other than those of the TEon family can exhibit a loss characteristic which decreases with increasing frequency. The TM11 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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