Departures from perfect geometry in a multi-mode circular waveguide used for circular electric ware transmission will cause coupling between the TE01signal mode and the other propagating modes. Such coupling causes serious degradation of signal fidelity after long travel distances. These effects have been studied in a long 5-inch-diameter guide in the 9000-mc band, for effective pulse travel distances up to 12 miles. Mode filters have been developed which suppress all spuriously generated modes in this guide. It is found that the insertion of these mode filters at reasonable intervals along the waveguide reduces pulse distortion to a negligible level and smooths the variations in the loss versus frequency characteristic.
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W. D. Warters (1958) studied this question.
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