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Antenna aperture size reduction using subbeam concept in multiple spot beam cellular satellite systems
Author(s) -
Kilic Ozlem,
Zaghloul Amir I.
Publication year - 2009
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2008rs004052
Subject(s) - bandwidth (computing) , aperture (computer memory) , frequency reuse , communications satellite , beam (structure) , satellite , optics , interference (communication) , computer science , reduction (mathematics) , beam divergence , antenna aperture , antenna (radio) , beam diameter , telecommunications , radiation pattern , physics , acoustics , engineering , aerospace engineering , base station , mathematics , laser beams , geometry , laser , channel (broadcasting)
Multiple beam configurations in satellite systems enable the reuse of frequency in beams separated by a sufficient distance to address bandwidth limitation issues. Phased array antennas can simultaneously produce a large number of spot beams directed toward specific areas and therefore are a natural platform for multiple‐beam satellite communications. This paper discusses a method to generate a large number of spot or cellular beams for multiple‐beam satellite systems using smaller apertures. The basic spot beam is divided into a number of smaller subbeams with lower crossover levels that operate within the same bandwidth as the spot beam. The frequency reuse configuration can be maintained, while the overall aperture size is reduced. The aperture reduction is shown to have little or no effect on the cochannel interference. The technique is applicable to all satellite orbits as well as high‐altitude platforms.