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Leaky Wave Enhanced Feeds for Multi-Beam Reflector Systems

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Author: Neto, A. · Gerini, G. · Llombart, N. · Ettorre, M. · Maagt, P. de
Type:article
Date:2011
Source:2011 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APS URSI 2011, 3 - 8 July 2011, Spokane, WA, USA, 2995-2998
Identifier: 443176
doi: doi:10.1109/APS.2011.5997159
Keywords: Physics · Waves · Antenna feeds · Reflector antennas. · Physics & Electronics · RT - Radar Technology · TS - Technical Sciences

Abstract

Abstract—This paper discusses the use of dielectric superlayers to shape the radiation pattern of focal plane feeds of a multi-beam reflector system. The shaping of the pattern is obtained by exciting a pair (TE/TM) of leaky waves that radiate incrementally as they propagate between the ground plane and the super-layer. Using the super-layers, it is possible to reduce the spillover from the reflectors without increasing the dimension of each aperture. This effect is achieved with an inter-element distance between the feeds of 2.4 wavelengths, which can be considered typical for satellite based multi beam telecommunication links. Thanks to the adoption of a x4 reuse scheme, based on frequency and polarization orthogonal channels, the measured edge of coverage gain has improved, with respect to a standard technology case, by 2 dB over an operational bandwidth of 2%.