Field-programmable beam reconfiguring based on digitally-controlled coding metasurface.
Field-programmable beam reconfiguring based on digitally-controlled coding metasurface.
复制标题
基于数控编码超表面的现场可编程光束重构
DOI：
10.1038/srep20663
复制
发表时间：
2016-02-10
影响因子：
4.6
通讯作者：
Cui TJ
中科院分区：
文献类型：
--
作者：
Wan X;Qi MQ;Chen TY;Cui TJ
传统的相控阵天线都采用数字移相器来实现波束控制。然而，移相器处理感应电流的相位;因此，它必须在天线阵列的每个元件的路径中，使得相控阵天线非常昂贵。超材料和/或超表面通过设计亚波长结构实现电磁波的直接调制，这为控制光束扫描开辟了新的途径。在这里，我们提出了一个直接的数字机制来控制散射电磁波使用编码元表面，其中每个单元格加载一个pin二极管，以产生二进制编码状态的“1”和“0”。通过数据线，编码元表面与现场可编程门阵列（FPGA）内部存储器之间建立了即时通信。从而实现了电磁波的数字调制，并由此得到了具有良好测量性能的现场可编程反射式天线。该机制和功能器件在新概念雷达和通信系统中具有很大的应用潜力。
Digital phase shifters have been applied in traditional phased array antennas to realize beam steering. However, the phase shifter deals with the phase of the induced current; hence, it has to be in the path of each element of the antenna array, making the phased array antennas very expensive. Metamaterials and/or metasurfaces enable the direct modulation of electromagnetic waves by designing subwavelength structures, which opens a new way to control the beam scanning. Here, we present a direct digital mechanism to control the scattered electromagnetic waves using coding metasurface, in which each unit cell loads a pin diode to produce binary coding states of “1” and “0”. Through data lines, the instant communications are established between the coding metasurface and the internal memory of field-programmable gate arrays (FPGA). Thus, we realize the digital modulation of electromagnetic waves, from which we present the field-programmable reflective antenna with good measurement performance. The proposed mechanism and functional device have great application potential in new-concept radar and communication systems.