01 January 1970 6 6K Report

A clarification regarding the definition of cutoff frequency for Dielectric waveguides. Quoting Yeh and Shimabukuro:

"The cutoff frequency does not have the conventional definition as that for the metal waveguides. Here it is defined that at the cutoff frequency the open dielectric waveguide structure ceases to act as a binding medium for the guided surface wave, and the wave can no longer be guided by the structure." 

Does this mean that it's more like an upper limit to the frequency of operation rather than the lower limit as in metallic waveguides? Note that .in my situation I am considering a solid cylinder of dielectric material (HDPE)

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