可穿戴设备是物联网的最新应用，前景广阔。柔性传感器是可穿戴设备的核心。作为传感技术应用最广泛的磁传感器，柔性化研究极少。“柔性无源无线传感器”同时具备传感、柔性、无源和无线功能，完全满足可穿戴无线传感器网络的要求，是可穿戴传感技术发展的重要趋势。但现有柔性无源无线传感技术都是对这些功能独立研究，而对之间的联系，尤其是相互作用鲜有报道。本项目创新提出融合磁电换能和声表面波技术的柔性无源无线磁传感器，同时实现“一体化”设计和“全双工”通信，根本解决声表面波传感器的无线通信距离瓶颈。以可穿戴磁传感器为研究对象，以柔性磁电换能器的非线性研究为切入点，以基于新型波模式的柔性声表面波技术为手段，系统研究磁-电-声表面波非线性耦合机理和柔性声表面波磁传感原理，探索声表面波磁传感器全双工技术思路，提出一套实现全双工柔性无源无线磁传感器的一体化设计方法，为提高我国磁传感器的智能可穿戴水平提供理论和技术支撑。

Wearable device is the latest application of the Internet of Things (IoT), and it has very broad application prospects. Flexible sensor is the core of wearable device. As the most widely used sensor technology, the research of flexible magnetic sensor is very little. Flexible passive wireless sensor can fully satisfy the design requirements of wearable wireless sensor networks, owing to its integrated functions of sensing, flexibility, passive and wireless. Furthermore, flexible passive wireless sensor is also an important trend of wearable sensor technology development. However, the current flexible passive wireless sensor techniques mainly focus on the above mentioned functions independently. The researches on the relation especially the interaction of these functions are seldom discussed. In this project, we propose a novel flexible passive wireless magnetic sensor based on the magnetoelectric transducer and Surface Acoustic Wave (SAW) technology. The flexible passive wireless magnetic sensor has an integrative structure, which integrated with the functions of sensing, flexible, passive and wireless in one structure. Moreover, the proposed flexible passive wireless magnetic sensor can also achieve the full-duplex communication, which could solve the wireless communication distance bottleneck of SAW sensors. The research object of this project is the wearable magnetic sensor. The breakthrough point of this project is the study of flexible magnetoelectric transducer based on nonlinear coupling effect. The research means of this project is the study of flexible SAW technology with the new wave mode. The magneto-electro-surface acoustic wave nonlinear coupling mechanisms and the flexible SAW magnetic field sensing principles will be systematically studied. The physical mechanisms and technical methods of the full-duplex communication of passive wireless SAW magnetic sensor will be explored in this project. A theoretical design method of the proposed integrative full-duplex flexible passive wireless magnetic sensor will be also provided in this project. Finally, this project will provide theoretical and technical supports for the enhancement of intelligent wearable level of magnetic sensor.