Frequency-diverse MIMO metasurface antenna for computational imaging with aperture rotation technique

被引:3
作者
Wang, Tong [1 ]
Han, Jiaqi [1 ]
Ma, Xiangjin [1 ]
Liu, Haixia [1 ]
Li, Long [1 ]
机构
[1] Xidian Univ, Sch Elect Engn, Key Lab High Speed Circuit Design & EMC, Minist Educ, Xian, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
aperture rotation technique; computational imaging; metasurface antenna; MIMO; frequency-diverse; ALGORITHMS;
D O I
10.3389/fmats.2022.1112339
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Metasurface antennas have been proposed for computational imaging (CI) systems, which can reconstruct images without using mechanical scanning or large antenna arrays. In a CI system based on metasurface antennas, a variety of different radiation fields, which can be applied to sample the objects, are generated by exciting different frequency points in broadband. According to the compressed sensing theory, the imaging performance of the system is mainly limited by frequency-diversity radiation modes. In general, it is difficult to achieve rich radiation modes; therefore, a special design of metasurface aperture is required. In this paper, we propose a frequency-diversity MIMO metasurface antenna that consists of 2 x 2 sub-apertures with randomly distributed surface impedance. By employing the aperture rotation technique (ART) which rotates the MIMO metasurface antenna around the panel axis, the pseudo-randomness of the radiation fields is utilized. The diversity of the radiation field is improved on the premise of ensuring the relatively low complexity of the system. The ART significantly improves the measurement richness at the cost of increasing the measurement time. The performance of the proposed method is evaluated through simulations and experiments, suggesting that the proposed 2 x 2 MIMO metasurface antenna and the ART are effective to reconstruct high-quality images.
引用
收藏
页数:7
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