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Content Provider | IET Digital Library |
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Author | Liu, Kang Cheng, Yongqiang Wang, Hongqiang Li, Xiang Qin, Yuliang |
Abstract | Radiation pattern synthesis methods for the generation of orbital angular momentum (OAM) beams based on circular arrays are proposed. The concentric-ring arrays are designed to suppress the side lobes of the radiation pattern firstly. Based on the genetic algorithm, two objective functions are defined to calculate the signal amplitude of each ring. Simulation results show that the proposed method can effectively suppress the side lobes, lower than −30 dB. Subsequently, for electromagnetic vortex imaging, the beam steering technique is applied to enhance the directivity of vortex beams for different OAM modes. Analyses indicate that large steering angle would lead to some distortion of the phase-front distribution. Finally, the imaging model after beam optimisation is established and the sparse Bayesian method is exploited to image the target with high resolution. The work can benefit the generation of OAM-carrying beams and its wide applications in radio communication and radar imaging. |
Starting Page | 685 |
Ending Page | 694 |
Page Count | 10 |
ISSN | 17518725 |
Volume Number | 11 |
e-ISSN | 17518733 |
Issue Number | Issue 5, Apr (2017) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-map/11/5 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0681 |
Journal | IET Microwaves, Antennas & Propagation |
Publisher Date | 2016-11-28 |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | Angular Momentum Antenna Array Antenna Radiation Pattern Bayes Method Beam Optimisation Beam Steering Beam Steering Technique Circular Array Concentric-ring Array Directive Antenna Electromagnetic Vortex Imaging Genetic Algorithm Image Resolution OAM-carrying Beam Generation Optimisation Technique Orbital Angular Momentum Beam Generation Phase-front Distribution Radar Imaging Radiation Pattern Synthesis Radio Communication Side Lobe Suppression Signal Amplitude Sparse Bayesian Method Statistics Vortex Beam Directivity Enhancement Vortex Electromagnetic Wave Generation |
Content Type | Text |
Resource Type | Article |
Subject | Electrical and Electronic Engineering |
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