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Overlapped feeds in multi beam reflector antennas

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Author: Neto, A. · Gerini, G. · LLombart, N. · Bonnedat, M. · Maagt, P. de
Type:article
Date:2007
Publisher: Institute of Engineering and Technology IET
Place: Stevenage
Institution: TNO Defensie en Veiligheid
Source:Proceedings of the 2nd European Conference on Antennas and Propagation (EuCAP), 11 - 16 November 2007, Edinburgh, UK
series:
IET Seminar Digest
Identifier: 242117
doi: doi:10.1049/ic.2007.0898
Keywords: Physics · Antenna feeds · Antenna radiation patterns · Focal planes · Reflector antennas · Leaky wave antennas

Abstract

The performances of focal plane arrays that implement multibeam coverage from a single reflector antenna are usually reduced by conflicting requirements on the feed elements. Dense packing is required to minimize the beam separation, while typically large apertures provide the high feed directivity which in turn translates in low spill over losses from the reflector. In this contribution, the use of a dielectric super-layer to shape the radiation pattern of each feed, so that the spill over from the reflector is reduced without increasing the dimensions of each aperture, is discussed.