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Efficiency enhancement of time-modulated arrays with optimized switching sequences

Mazaheri, M. H ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1109/TAP.2018.2829801
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2018
  4. Abstract:
  5. 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 improves by 8.3 dB for the fundamental frequency. The efficiency enhancement for the first and second sidebands is 2.9 and 2.95 dB, respectively. In addition, a fast and low-cost setup for TMA measurement using the commercial software defined radio dongle is implemented in this paper. © 1963-2012 IEEE
  6. Keywords:
  7. Array efficiency ; Complementary mode switching (CMS) ; Software defined radio (SDR) ; Time-modulated arrays (TMAs) ; Wireless communication ; Amplitude modulation ; Analog circuits ; Antenna arrays ; Dipole antennas ; Directional patterns (antenna) ; Harmonic analysis ; Radio ; Radio receivers ; Slot antennas ; Software radio ; Switches ; Switching ; Time switches ; Wireless telecommunication systems ; Mode-switching ; Radio frequencies ; Software-defined radios ; Time modulated arrays ; Wireless communications ; Efficiency
  8. Source: IEEE Transactions on Antennas and Propagation ; Volume 66, Issue 7 , July , 2018 , Pages 3411-3420 ; 0018926X (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/8345662