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Efficiency enhancement of time-modulated arrays with optimized switching sequences
, Article IEEE Transactions on Antennas and Propagation ; Volume 66, Issue 7 , July , 2018 , Pages 3411-3420 ; 0018926X (ISSN) ; Fakharzadeh, M ; Akbari, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
The conventional time-modulated arrays (TMAs) have a low radiation efficiency, since each antenna turns off at specific time slots. In this paper, first, the efficiency of TMA is investigated analytically. Next, the optimized switching sequences are proposed to enhance the radiation efficiency of a specific sideband, while preserving the level of the other sidebands. The practical hardware limitations are considered in the switching sequence design. Moreover, a low-cost flexible eight-element printed dipole array operating at 1.2-1.4 GHz is implemented to verify the proposed algorithms. The measured radiation patterns indicate that by applying the proposed sequences, the TMA efficiency...