终端近场通信天线研究

Research on NFC Antenna for Mobile Terminal Applications

近场通信(NFC)已成为无线终端的标配功能,工作范围小、抗干扰性和安全性较高的特性使其被广泛应用于终端的移动支付和虚拟卡片等领域。由于近场天线产生的感应磁场会在临近的金属上耦合出反向涡流,并且金属屏蔽物覆盖会降低收发天线间的磁场耦合,紧凑终端中的电池、主板、外壳等金属元件将大幅影响NFC天线性能。本文从近场通信的历史、标准、系统结构出发,以终端NFC天线工作环境中的金属覆盖情况作为分类依据,对终端近场通信天线的研究进展进行了简要介绍。

Near field communication(NFC) has become a prerequisite function for wireless terminals. Due to the property of small detection range, good anti-interference ability, and high safety, it is widely applied to mobile payment and virtual card. The reverse eddy current will be induced on metallic components in close-proximity range by the magnetic field of the NFC antenna. Besides, the shielding metallic components will block the magnetic flux between the transmitting and receiving antennas. Hence, the metallic components inside the mobile terminals like battery, mainboard, and back cover will significantly influence the performance of the NFC antenna. In this paper, the history, standards, system structure of NFC are introduced at the beginning and the research progress of NFC antenna for mobile terminal is briefly introduced as follows based on the metallic covering condition in the operating environments.