Abstract
A helix circular waveguide 380 feet long has been deformed into three different curves. The added mode conversion loss for a TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> signal mode has been measured and calculated theoretically, with good agreement. For a curve with 30-inch deflection over a distance of 100 feet, peak-to-valley (200-ft period), the measured added loss at 55.5 kmc was 0.23 db/mile, the calculated 0.20 db/mile.
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