Withington, Stafford and Murphy, J.Anthony (1992) Analysis of diagonal horns through Gaussian-Hermite modes. IEEE Transactions on Antennas and Propagation, 40 (2). pp. 198-206. ISSN 0018-926X

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Abstract

The radiation characteristics of diagonal horns are investigated by means of Gaussian-Hermite modes. It is shown that, for reasonably long horns, the beamwidths in the principal and 45 degrees planes are equal to within 10%, and all sidelobes are below -15 dB. It is also demonstrated that the phase center of a diffraction-limited horn is close to the aperture, whereas the phase center of a constant-beamwidth horn is behind the throat. The maximum coupling to the lowest order copolar Gaussian mode is 84%, and the total amount of power coupled into the cross-polarized lobes is 9.5%. More significantly, the aperture efficiency of a Cassegrain antenna fed by a diagonal horn has a maximum value of 81%, which compares with 87% for a corrugated horn. The maximum efficiency is achieved when the aperture of a diffraction-limited horn is placed at a confocal tertiary focus, although a secondary focus gives an aperture efficiency that is only 10% lower, suggesting that diagonal horns are suitable for focal-plane arrays.

Item Type:	Article
Additional Information:	Cite as: S. Withington and J. A. Murphy, "Analysis of diagonal horns through Gaussian-Hermite modes," in IEEE Transactions on Antennas and Propagation, vol. 40, no. 2, pp. 198-206, Feb. 1992, doi: 10.1109/8.127404.
Keywords:	Gaussian processes; Diffraction; Manufacturing; Millimeter wave technology; Optical propagation; Aperture antennas; Horn antennas; Millimeter wave circuits; Machining;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	14277
Identification Number:	https://doi.org/10.1109/8.127404
Depositing User:	Dr. Anthony Murphy
Date Deposited:	29 Mar 2021 14:48
Journal or Publication Title:	IEEE Transactions on Antennas and Propagation
Publisher:	Institute of Electrical and Electronics Engineers
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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