Quasi-omnibearing retro-reflective metagrating protected by reciprocity  

作　　者：Yuxiang Jia Jiafu Wang Yajuan Han Ruichao Zhu Zhongtao Zhang Jie Yang Yueyu Meng Yongfeng Li Shaobo Qu 

机构地区：[1]Department of Basic Sciences,Air Force Engineering University,Xi’an 710051,China [2]Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices,Xi'an 710051,China

出　　处：《Photonics Research》2022年第4期843-854,共12页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(51802349,61801509,61901508,61971435,62101588,62101589);National Key Research and Development Program of China(2017YFA0700201);Young Talent Fund of University Association for Science and Technology in Shaanxi(2021JQ-363);Air Force Engineering University Excellent Doctoral Dissertation Support Foundation(KGD080920016).

摘　　要：Reciprocity is ubiquitous in antennas for receiving and radiating electromagnetic(EM) waves, i.e., if an antenna has good receiving performance at a given direction, it also has good radiation performance in that direction.Inspired by this, we propose a method of designing a quasi-ominibearing retro-reflective metagrating(RRMG)protected by the reciprocity of antennas. Based on the second-order mode around 15.0 GHz of a short-circuited structured patch antenna(SPA), incident transverse magnetic waves can be received, channeled into the coaxial lines, reflected by the shortened end, and finally re-radiated into free space with a reversed wave vector. RRMGs are contrived consisting of this identical SPA, with a grating constant allowing ±2nd-, ±1st-, and zeroth-order diffractions. Oblique incidence, plus the tilted nulls of the re-radiation pattern, can eliminate -1st, zeroth,+1st, and +2nd orders, and only the -2nd order is left to achieve retro-reflections. Prototypes were fabricated and measured. Simulated and measured results show that the RRMGs maintain only -2nd-order diffraction for incident angles 32.2° ≤ θ_(i)< 90.0° in four quadrants, and that RRMGs can achieve quasi-omnibearing retro-reflections for θ_(i)= 50.0°. The use of higher-order diffraction brings more degrees of freedom in manipulating EM waves, and this strategy can be readily extended to millimeter waves, THz wave, or even optical regimes.

关 键 词：REFLECTIVE antenna antennas 

分 类 号：O441.4[理学—电磁学] TN820[理学—物理]