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International Journal of Antennas and Propagation
Volume 2009, Article ID 624035, 10 pages
Research Article

Sunflower Array Antenna with Adjustable Density Taper

1International Research Centre for Telecommunications and Radar (IRCTR), Delft University of Technology, Mekelweg 4, P.O. Box 5031, 2628 GA Delft, The Netherlands
2European Space Agency, ESA-ESTEC, 2200 AG Noordwijk, The Netherlands
3Thales Alenia Space, 26 Avenue J. F. Champollion, 31037 Toulouse, Cedex 1, France

Received 24 September 2008; Accepted 5 January 2009

Academic Editor: Stefano Selleri

Copyright © 2009 Maria Carolina Viganó et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A deterministic procedure to design a nonperiodic planar array radiating a rotationally symmetric pencil beam pattern with an adjustable sidelobe level is proposed. The elements positions are derived by modifying the peculiar locations of the sunflower seeds in such a way that the corresponding spatial density fits a Taylor amplitude tapering law which guarantees the pattern requirements in terms of beamwidth and sidelobe level. Different configurations, based on a Voronoi cell spatial tessellation of the radiative aperture, are presented, having as a benchmark the requirements for a typical multibeam satellite antenna.