毫米波识别技术源于射频识别，是技术进步更是一种未来发展趋势，因为毫米波频段可用带宽更宽、硬件尺寸更小、传输速率更快。本项目提出的新型双圆极化无源无芯毫米波识别系统，读取无需预知标签的极化方向，可解决现有传统系统因标签对准误差导致读取不准确、信息解码有误的难题；无需昂贵的毫米波芯片，减小了标签成本；同时阅读器采用双圆极化收发天线，端口隔离度高。本项目拟开展如下创新研究：（1）利用连续旋转馈电和共享辐射单元提高平面微带阵列天线的双圆极化性能、收发隔离度；（2）增大小尺寸无源无芯毫米波标签的编码能力；以及（3）实现毫米波识别系统的协同设计、一体化仿真、和精确测量。本项目对毫米波识别技术的研究将推动毫米波技术在5G系统与网联网IoT平台的应用。

Millimeter-wave identification comes from radio-frequency identification, with more advanced technology and the trend of the future, because of the wider bandwidth, smaller hardware size, and higher data speed in millimeter-wave band. A chipless millimeter-wave identification system with dual circular polarization is proposed, which does not require the precognition of the polarization of tags, in order to solve the problem in conventional systems which is the reading error due to the polarization alignment of tags; besides, this tag does not need expensive millimeter-wave chip so as to reduce the cost; and it achieves high isolation between the transmitting and receiving ports by using dual circularly polarized antenna in the reader. This project will research as follows: (1) employing the sequential rotated feed and shared radiation patches to improve the circularly polarized performance and port isolation of the planar microstrip antenna; (2) improving the coding ability of chipless millimeter-wave tags with compact size; and (3) realizing the co-design, co-simulation, as well as the precision measurement of the proposed identification system. In all, this research will push the applications of millimeter-wave technology in the 5G communication systems and platform of the Internet of Things.