© The Institution of Electrical Engineers
A simpler solution for spherical hybrid modes in corrugated conical horns has been shown to have a deviation from the rigorous solution of less than 0.7 dB for the case considered by Clarricoats. Expressions for the radiation pattern and gain of such a horn with small flare angle have been obtained under balanced hybrid conditions.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19700020
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