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International Journal of Antennas and Propagation
Volume 2016, Article ID 1320726, 7 pages
http://dx.doi.org/10.1155/2016/1320726
Research Article

Design of Wideband Multifunction Antenna Array Based on Multiple Interleaved Subarrays

School of Information and Navigation, Air Force Engineering University, Fenghao East Street, Lianhu District, Xi’an, Shaanxi 710077, China

Received 18 October 2015; Revised 8 January 2016; Accepted 20 January 2016

Academic Editor: Andy W. H. Khong

Copyright © 2016 Longjun Li and Buhong Wang. 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 new Modified Iterative Fourier Technique (MIFT) is proposed for the design of interleaved linear antenna arrays which operate at different frequencies with no grating lobes, low-sidelobe levels, and wide bandwidths. In view of the Fourier transform mapping between the element excitations and array factor of uniform linear antenna array, the spectrum of the array factor is first acquired with FFT and its energy distributions are investigated thoroughly. The relationship between the carrier frequency and the element excitation is obtained by the density-weighting theory. In the following steps, the element excitations of interleaved subarrays are carefully selected in an alternate manner, which ensures that similar patterns can be achieved for interleaved subarrays. The Peak Sidelobe Levels (PSLs) of the interleaved subarrays are further reduced by the iterative Fourier transform algorithm. Numerical simulation results show that favorable design of the interleaved linear antenna arrays with different carrier frequencies can be obtained by the proposed method with favorable pattern similarity, low PSL, and wide bandwidths.