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International Journal of Antennas and Propagation
Volume 2015, Article ID 136826, 6 pages
http://dx.doi.org/10.1155/2015/136826
Research Article

Sidelobe Suppression with Null Steering by Independent Weight Control

1Department of Electronic Engineering, IIU, H-10, Islamabad 44000, Pakistan
2Department of Electrical Engineering, COMSATS Institute of Information Technology, Attock Campus, Attock 43600, Pakistan
3School of Engineering and Applied Sciences, ISRA University, Islamabad Campus, Islamabad 44000, Pakistan

Received 20 April 2015; Accepted 18 May 2015

Academic Editor: Vincenzo Galdi

Copyright © 2015 Zafar-Ullah Khan 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

A uniform linear array of antenna elements can steer up to nulls. In situations where less than nulls are required to be steered, the existing algorithms have no criterion to utilize the remaining weights for sidelobe suppression. This work combines sidelobe suppression capability with null steering by independent weight control. For this purpose, the array factor is transformed as the product of two polynomials. One of the polynomials is used for null steering by independent weight control, while the second one is for sidelobe suppression whose coefficients or weights are determined by using convex optimization. Finally, a new structure is proposed to incorporate the product of two polynomials such that sidelobe suppression weights are decoupled from those of null steering weights. Simulation results validate the effectiveness of the proposed scheme.