Gleeson, E. and Murphy, J.Anthony and Maffei, B. (2002) “Phase Centers” of Far Infrared Multi-Moded Horn Antennas. International Journal of Infrared and Millimeter Waves, 23. pp. 711-730. ISSN 0195-9271

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Abstract

Multi-moded horn antennas can be used as high efficiency feeds for bolometers when diffraction limited resolution is not required. For example, such horns are proposed for the PLANCK Surveyor, a satellite telescope due to be launched in 2007 to make definite measurements of the Cosmic Microwave Background. In a previous paper we described an accurate approach involving electromagnetic modelling using a rigorous mode matching technique to obtain both the horn aperture fields and the corresponding far field radiation patterns. In this paper we extend this description to determine the “phase center” of such horns when used on large reflecting telescopes. The “phase center” is ill defined as the individual spatially coherent fields making up the far field pattern all appear to come from different phase centers. The best average phase center location is therefore redefined in terms of the virtual beam waist position behind the horn aperture at which the focus of the telescope should be located in order to optimise angular resolution and on-axis gain for the beam on the sky. A number of alternative techniques to locating the phase center are discussed in detail in thes paper.

Item Type:	Article
Additional Information:	Cite as: Gleeson, E., Murphy, J.A. & Maffei, B. “Phase Centers” of Far Infrared Multi-Moded Horn Antennas. International Journal of Infrared and Millimeter Waves 23, 711–730 (2002). https://doi.org/10.1023/A:1015710519226
Keywords:	Multi-moded Horn Antennas; Phase center; Virtual Waist; Modal analysis;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	14178
Identification Number:	https://doi.org/10.1023/A:1015710519226
Depositing User:	Dr. Anthony Murphy
Date Deposited:	12 Mar 2021 14:33
Journal or Publication Title:	International Journal of Infrared and Millimeter Waves
Publisher:	Springer Verlag
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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