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Reflection Coefficient of Unequal Displaced Rectangular Waveguides (Letters)

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1 Author(s)

The IEC has suggested that maximum allowable displacements of waveguide flanges should not cause the inherent return loss due to waveguide tolerances to degrade more than 1 dB. Calculations on displaced unequal waveguides at their extreme tolerances show that this leads to a maximum allowable displacement of 0.0175 of the broad (= a) dimension for a waveguide tolerance of ± a/500. The worst return loss under these conditions is approximately -41dB. However, it is suggested that this maximum allowable displacement is based on a statistically remote worse case condition, and relaxation to a value of 0.021a would be more realistic.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:24 ,  Issue: 7 )