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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 757989, 7 pages
http://dx.doi.org/10.1155/2015/757989
Research Article

A Multiple Beamforming Network for Unequally Spaced Linear Array Based on CORPS

1Faculty of Sciences, Universidad Autonoma de San Luis Potosi, 78290 San Luis Potosi, SLP, Mexico
2Department of Electronics and Telecommunications, CICESE Research Centre, 22860 Ensenada, BC, Mexico

Received 11 May 2015; Revised 26 June 2015; Accepted 1 July 2015

Academic Editor: Quanyuan Feng

Copyright © 2015 Armando Arce 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.

Abstract

This paper proposes an alternative and innovative way to design a simpler beamforming network (BFN) based on balancing alternated power combiners and dividers, to feed a nonuniformly spaced linear array with Gaussian amplitude and coherent (in-phase) signals. Thus, a two-beam design configuration of the feeding network for a nonuniform array with beam steering capability is proposed and analyzed. The nonuniform aperture and the complex inputs of the feeding network are optimized by means of a differential evolution algorithm. In addition, a comparative analysis between a uniform and nonuniform linear array with the proposed feeding network is performed. Simulation results show the advantages and effectiveness of the proposed feeding network exploiting the nonuniformity of the antenna elements, in terms of side lobe level and directivity. Furthermore, research results show an inherent reduction in hardware complexity of the network.