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International Journal of Antennas and Propagation
Volume 2017, Article ID 5901625, 14 pages
https://doi.org/10.1155/2017/5901625
Research Article

Smart Cylindrical Dome Antenna Based on Active Frequency Selective Surface

1College of Information Engineering, Jimei University, Xiamen 361021, China
2Aviation Key Laboratory of Science and Technology on Electromagnetic Environmental Effects, Shenyang Aircraft Design and Research Institute, Shenyang 110035, China
3Department of Electronic Science, Xiamen University, Fujian 361005, China

Correspondence should be addressed to Liang Zhang; nc.ude.umj@gnahzgnail

Received 8 July 2016; Revised 8 December 2016; Accepted 27 December 2016; Published 7 February 2017

Academic Editor: Diego Caratelli

Copyright © 2017 Tongyu Ding 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

In this paper, we proposed a beamforming antenna, which is realized using an omnidirectional antenna in the center surrounded by a cylindrical smart dome. The smart dome is made of 16 active frequency selective surface columns of which the amplitude and phase response can be continuously tuned by varying the bias voltages of the employed varactors. Thus, the performance of the proposed antenna could achieve higher gain, better nulling level, and more agility than many switch methods-based cylindrical reconfigurable antennas. Moreover, in order to overcome the unavailable analytical synthesis caused by complex mutual coupling between columns, we develop a genetic algorithm based optimization system and conducted a serial of experiments to evaluate the high-gain, nulling, continuously steering, and frequency-invariant ability. The results show that, during the frequency tunable range of the AFSS (2.0 GHz to 2.7 GHz), the antenna can offer an additional gain of up to 6.57 dB and nulling level of −56.41 dBi. For the high-gain modes, the −3 dB beam widths are 26°–34°, which offers enhanced angular resolution compared with other reported beam-sweeping work. Furthermore, the radiation pattern is continuously steerable.