Mode Conversion Losses

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Fusion Products
Miter Bends & Polarizers
Mode Conversion Losses

Mode conversion losses from HE₁₁ in a miter bend with a flat mirror can be estimated from the diameter (D) and the wavelength (lambda) using the formula:

mode conversion loss per miter bend ~ 2.4 (lambda/D)^3/2 dB

This formula represents an average over a range of frequencies. The actual loss can be expected to be somewhat above or below this estimate. Some comparisons of measured and calculated losses on waveguide runs with 2 - 8 miter bends:

waveguide diameter	frequency	miter bends tested	experimental loss per miter bend	calculated loss per miter bend
31.75 mm	110 GHz	6	0.06 dB	0.06 dB
63.5 mm	60 GHz	8	0.03 dB	0.05 dB
31.75 mm	56 - 64 GHz	2	0.15 dB	0.15 dB