摘要
近场通信(Near Field Communication,NFC)系统通信频率为13.56 MHz,采用近场磁耦合方式进行信号传输,具有通信距离近、安全度高等特点,广泛应用在银联、公交、门禁等领域.随着NFC技术的发展,越来越多的智能终端设备中配备了NFC系统.由于NFC系统工作频率低,NFC天线面积较大,天线尺寸通常为30 mm×40 mm,而且配置磁性基板用于金属环境使用,这使NFC天线制造成本较高,不利于NFC系统应用.本文通过空间磁场分布理论计算,采用分布式磁性基板设计,大幅降低磁性基板使用面积,并通过NFC天线结构设计,提高天线磁场辐射性能.仿真与实验证明,该设计方法使NFC天线磁性基板使用面积下降约40%,且天线辐射能力增强.在提升天线性能的同时,有效降低天线成本.
The near field communication (NFC) system has a communication frequency of 13.56 MHz. It uses near-field magnetic coupling for signal transmission. It has the characteristics of close communication distance and high security. It is widely used in the fields of UnionPay, public transportation, and access control. With the development of the NFC technology, increasing intelligent terminal devices are equipped with NFC systems. Due to the low operating frequency of the NFC system, the NFC antenna usually has a large area (30 mm×40 mm), and the magnetic substrate is configured for use in a metal environment, which makes the NFC antenna expensive to manufacture and unsuitable for NFC system applications. In this work, by theoretical calculation of spatial magnetic field distribution, the distributed magnetic substrate design was adopted to greatly reduce the area of the magnetic substrate. And the magnetic field radiation performance of the antenna was improved by the NFC antenna structure design. Simulation and experiment prove that the design method reduces the magnetic substrate area of the NFC antenna by 40%, and the antenna radiation capability is improved, which improves the antenna performance and effectively reduces the antenna cost.
作者
李维佳
梁迪飞
张国瑞
周阳
刘彦宁
邓龙江
LI Weijia;LIANG Difei;ZHANG Guorui;ZHOU Yang;LIU Yanning;DENG Longjiang(National Engineering Research Center of Electromagnetic Radiation Control Materials,University of Electronic Science and Technology of China,Chengdu 610054,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2019年第11期61-65,共5页
Electronic Components And Materials
关键词
近场通信
NFC天线
低成本
磁性基板
near field communication
NFC antenna
low cost
magnetic substrate
