A concept for single-frequency microwave imaging using orbital angular momentum (OAM) carrying wave is introduced. The orthogonality of OAM waves, which is well suited for compressed sensing, enables the reconstruction of a sparse scene with limited measurements. A traveling wave circular slot antenna is demonstrated to generate the OAM carrying wave theoretically and experimentally. Using a set of illumination patterns radiated from the designed OAM antennas as the measurement modes, the echo signals versus OAM modes are acquired and the scene is reconstructed based on computational imaging methods. This microwave imaging scheme is verified by a proof-of-principle experiment at a single frequency without mechanical scanning or beam-forming technologies.
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Research Article| May 12 2017
Single-frequency computational imaging using OAM-carrying electromagnetic wave
Shilie Zheng ;
Yiling Chen, Shilie Zheng, Xiaofeng Jin, Hao Chi, Xianmin Zhang; Single-frequency computational imaging using OAM-carrying electromagnetic wave. J. Appl. Phys. 14 May 2017; 121 (18): 184506. https://doi.org/10.1063/1.4983358
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