Mode conversion from TE11to TM11modes in circular waveguides is investigated. It is found that an iris placed across the waveguide or an abrupt change in guide radius (step) will produce a wide range of mode conversion coefficients which can be used in most dual-mode feedhorn applications. The step discontinuity is found to produce relatively constant mode conversion over a wide band of frequencies.
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Nagelberg et al. (1965) studied this question.
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