BS EN 61580-9:1997- Methods of measurement for waveguides - Reflection coefficient at rectangular waveguide interfaces
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This part of IEC 1580 gives the means for determining the reflection coefficient at the junction of two similar rectangular waveguides due to the following imperfections:
a) differences in the waveguides internal dimensions:
b) lateral displacement between the waveguide axes in either the H or E plans;
c) angular misalignment between the waveguide axes.