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Accurate absolute gain measurements on a typical 10-cm bandE-plane sectoral horn are described which demonstrate the conventional gain expression underestimates by 20 percent or more. More refined Kirchhoff expressions give little improvement. A new gain formula, incorporating the exact on-axisTE₁₀mode field of an open-ended parallel-plate waveguide and yielding much closer agreement with experiment, is proposed.
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Jull et al. (1974) studied this question.
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