Split-ring-based metamaterial for far-field subwavelength focusing based on time reversal  

作　　者：黄海燕 丁帅 王秉中 臧锐 

机构地区：[1]Institute of Applied Physics, University of Electronic Science and Technology of China

出　　处：《Chinese Physics B》2014年第6期199-205,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61071031,61331007,and 61107018);the Research Fund for the Doctoral Program of Higher Education of China(Grant Nos.20100185110021 and 20120185130001);the Fundamental Research Funds for the Central Universities,China(Grant No.E02205205);the Project ITR1113,China

摘　　要：In this paper, split-ring-based metamaterial sheets are designed for the purpose of achieving far-field subwavelength focusing, with the aid of a time-reversal technique. The metamaterial sheets are inserted into a subwavelength array consist- ing of four element antennas, with the element spacing being as small as 1/15 of a wavelength. Experiments are performed to investigate the effect of the metamaterial sheets on the focusing resolution. The results demonstrate that in the presence of the metamaterial sheets, the subwavelength array exhibits the ability to achieve super-resolution focusing, while there is no super-resolution focusing without the metamaterial sheets. Further investigation shows that the metamaterial sheets are contributive to achieving super-resolution by weakening the cross-correlations of the channel impulse responses between the array elements.In this paper, split-ring-based metamaterial sheets are designed for the purpose of achieving far-field subwavelength focusing, with the aid of a time-reversal technique. The metamaterial sheets are inserted into a subwavelength array consist- ing of four element antennas, with the element spacing being as small as 1/15 of a wavelength. Experiments are performed to investigate the effect of the metamaterial sheets on the focusing resolution. The results demonstrate that in the presence of the metamaterial sheets, the subwavelength array exhibits the ability to achieve super-resolution focusing, while there is no super-resolution focusing without the metamaterial sheets. Further investigation shows that the metamaterial sheets are contributive to achieving super-resolution by weakening the cross-correlations of the channel impulse responses between the array elements.

关 键 词：TIME-REVERSAL METAMATERIAL subwavelength focusing 

分 类 号：O441[理学—电磁学]