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Analysis of spherical hybrid modes in a corrugated conical horn

Analysis of spherical hybrid modes in a corrugated conical horn

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An approximate analysis of fields in a corrugated horn is considered using spherical hybrid modes. Under the special condition where the slots are about a quarter-wavelength deep, the approximations are slight in the far-field region of the horn. Solutions are presented for the lowest-order spherical hybrid modes, and a procedure is described for the determination of the horn radiation pattern. A first step in the procedure involves the calculation of the hybrid-mode field in the horn aperture. Because diffraction will be minimal in wide-angle corrugated horns, the aperture and radiation patterns should be similar when the far-field approximation applies. This feature is verified for a 120° horn making use of experimental results due to Kay.

References

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      • James, J., Longdon, L.: `Predication of arbitrary electromagnetic fields from measured data', URSI symposium on electromagnetic theory, 1968, Stresa, Italy, to be published in Alta Frequenza symposium issue, April 1969.
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